Voltammetric behaviour of cationic redox probes at mesoporous silica film electrodes

The effect of vertically aligned silica nanochannels on the electrochemical response of various cationic redox probes has been investigated. To this end, an oriented mesoporous silica thin film has been generated by electro-assisted self-assembly onto a fluorine-doped tin oxide (FTO) electrode, whic...
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Gespeichert in:

Autor*in:	Basnig, Deomila [verfasserIn] Vilá, Neus [verfasserIn] Herzog, Grégoire [verfasserIn] Walcarius, Alain [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2020

Schlagwörter:	Mesoporous silica film Modified electrode Redox cations Permeability Diffusion Accumulation

Übergeordnetes Werk:	Enthalten in: Journal of electroanalytical chemistry - New York, NY [u.a.] : Elsevier, 1959, 872
Übergeordnetes Werk:	volume:872

DOI / URN:	10.1016/j.jelechem.2020.113993

Katalog-ID:	ELV004706846

Internformat


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520			\|a The effect of vertically aligned silica nanochannels on the electrochemical response of various cationic redox probes has been investigated. To this end, an oriented mesoporous silica thin film has been generated by electro-assisted self-assembly onto a fluorine-doped tin oxide (FTO) electrode, which was then used to characterize the voltammetric behaviour of redox cations of different nature, size and charge. Methylene Blue (MB+), paraquat (PQ2+), diquat (DQ2+), ruthenium trisbipyridine (Ru(bpy)3 2+) and ruthenium hexamine (Ru(NH3)6 3+) were selected for that purpose. Multisweep cyclic voltammetry experiments showed significant accumulation of these cations thanks to favourable electrostatic interactions with the negatively-charge silica surface, but the enhancement of the votammetric signals compared to the bare FTO electrode was strongly dependent on the probe type, according the following trend: MB+ > PQ2+ > DQ2+ > Ru(bpy)3 2+ > Ru(NH3)6 3+. The accumulation processes were very fast owing to the vertical orientation of the mesopore channels ensuring fast diffusion from the solution to the electrode surface. Operating at various potential scan rates and different probe concentrations enabled to quantify the relative ratio between surface-confined and diffusion-controlled processes, the adsorption phenomena being clearly more prominent in diluted media and also accentuated at high potential scan rates. The mesoporous silica film electrodes exhibited higher sensitivities at lower concentrations, which can give benefits for sensor applications at trace levels.
650		4	\|a Mesoporous silica film
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650		4	\|a Redox cations
650		4	\|a Permeability
650		4	\|a Diffusion
650		4	\|a Accumulation
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publishDate	2020
allfields	10.1016/j.jelechem.2020.113993 doi (DE-627)ELV004706846 (ELSEVIER)S1572-6657(20)30176-4 DE-627 ger DE-627 rda eng 540 620 DE-600 35.27 bkl Basnig, Deomila verfasserin aut Voltammetric behaviour of cationic redox probes at mesoporous silica film electrodes 2020 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The effect of vertically aligned silica nanochannels on the electrochemical response of various cationic redox probes has been investigated. To this end, an oriented mesoporous silica thin film has been generated by electro-assisted self-assembly onto a fluorine-doped tin oxide (FTO) electrode, which was then used to characterize the voltammetric behaviour of redox cations of different nature, size and charge. Methylene Blue (MB+), paraquat (PQ2+), diquat (DQ2+), ruthenium trisbipyridine (Ru(bpy)3 2+) and ruthenium hexamine (Ru(NH3)6 3+) were selected for that purpose. Multisweep cyclic voltammetry experiments showed significant accumulation of these cations thanks to favourable electrostatic interactions with the negatively-charge silica surface, but the enhancement of the votammetric signals compared to the bare FTO electrode was strongly dependent on the probe type, according the following trend: MB+ > PQ2+ > DQ2+ > Ru(bpy)3 2+ > Ru(NH3)6 3+. The accumulation processes were very fast owing to the vertical orientation of the mesopore channels ensuring fast diffusion from the solution to the electrode surface. Operating at various potential scan rates and different probe concentrations enabled to quantify the relative ratio between surface-confined and diffusion-controlled processes, the adsorption phenomena being clearly more prominent in diluted media and also accentuated at high potential scan rates. The mesoporous silica film electrodes exhibited higher sensitivities at lower concentrations, which can give benefits for sensor applications at trace levels. Mesoporous silica film Modified electrode Redox cations Permeability Diffusion Accumulation Vilá, Neus verfasserin aut Herzog, Grégoire verfasserin (orcid)0000-0003-1932-9300 aut Walcarius, Alain verfasserin aut Enthalten in Journal of electroanalytical chemistry New York, NY [u.a.] : Elsevier, 1959 872 Online-Ressource (DE-627)302466533 (DE-600)1491150-4 (DE-576)098614797 1873-2569 nnns volume:872 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 35.27 Elektrochemische Analyse AR 872
spelling	10.1016/j.jelechem.2020.113993 doi (DE-627)ELV004706846 (ELSEVIER)S1572-6657(20)30176-4 DE-627 ger DE-627 rda eng 540 620 DE-600 35.27 bkl Basnig, Deomila verfasserin aut Voltammetric behaviour of cationic redox probes at mesoporous silica film electrodes 2020 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The effect of vertically aligned silica nanochannels on the electrochemical response of various cationic redox probes has been investigated. To this end, an oriented mesoporous silica thin film has been generated by electro-assisted self-assembly onto a fluorine-doped tin oxide (FTO) electrode, which was then used to characterize the voltammetric behaviour of redox cations of different nature, size and charge. Methylene Blue (MB+), paraquat (PQ2+), diquat (DQ2+), ruthenium trisbipyridine (Ru(bpy)3 2+) and ruthenium hexamine (Ru(NH3)6 3+) were selected for that purpose. Multisweep cyclic voltammetry experiments showed significant accumulation of these cations thanks to favourable electrostatic interactions with the negatively-charge silica surface, but the enhancement of the votammetric signals compared to the bare FTO electrode was strongly dependent on the probe type, according the following trend: MB+ > PQ2+ > DQ2+ > Ru(bpy)3 2+ > Ru(NH3)6 3+. The accumulation processes were very fast owing to the vertical orientation of the mesopore channels ensuring fast diffusion from the solution to the electrode surface. Operating at various potential scan rates and different probe concentrations enabled to quantify the relative ratio between surface-confined and diffusion-controlled processes, the adsorption phenomena being clearly more prominent in diluted media and also accentuated at high potential scan rates. The mesoporous silica film electrodes exhibited higher sensitivities at lower concentrations, which can give benefits for sensor applications at trace levels. Mesoporous silica film Modified electrode Redox cations Permeability Diffusion Accumulation Vilá, Neus verfasserin aut Herzog, Grégoire verfasserin (orcid)0000-0003-1932-9300 aut Walcarius, Alain verfasserin aut Enthalten in Journal of electroanalytical chemistry New York, NY [u.a.] : Elsevier, 1959 872 Online-Ressource (DE-627)302466533 (DE-600)1491150-4 (DE-576)098614797 1873-2569 nnns volume:872 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 35.27 Elektrochemische Analyse AR 872
allfields_unstemmed	10.1016/j.jelechem.2020.113993 doi (DE-627)ELV004706846 (ELSEVIER)S1572-6657(20)30176-4 DE-627 ger DE-627 rda eng 540 620 DE-600 35.27 bkl Basnig, Deomila verfasserin aut Voltammetric behaviour of cationic redox probes at mesoporous silica film electrodes 2020 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The effect of vertically aligned silica nanochannels on the electrochemical response of various cationic redox probes has been investigated. To this end, an oriented mesoporous silica thin film has been generated by electro-assisted self-assembly onto a fluorine-doped tin oxide (FTO) electrode, which was then used to characterize the voltammetric behaviour of redox cations of different nature, size and charge. Methylene Blue (MB+), paraquat (PQ2+), diquat (DQ2+), ruthenium trisbipyridine (Ru(bpy)3 2+) and ruthenium hexamine (Ru(NH3)6 3+) were selected for that purpose. Multisweep cyclic voltammetry experiments showed significant accumulation of these cations thanks to favourable electrostatic interactions with the negatively-charge silica surface, but the enhancement of the votammetric signals compared to the bare FTO electrode was strongly dependent on the probe type, according the following trend: MB+ > PQ2+ > DQ2+ > Ru(bpy)3 2+ > Ru(NH3)6 3+. The accumulation processes were very fast owing to the vertical orientation of the mesopore channels ensuring fast diffusion from the solution to the electrode surface. Operating at various potential scan rates and different probe concentrations enabled to quantify the relative ratio between surface-confined and diffusion-controlled processes, the adsorption phenomena being clearly more prominent in diluted media and also accentuated at high potential scan rates. The mesoporous silica film electrodes exhibited higher sensitivities at lower concentrations, which can give benefits for sensor applications at trace levels. Mesoporous silica film Modified electrode Redox cations Permeability Diffusion Accumulation Vilá, Neus verfasserin aut Herzog, Grégoire verfasserin (orcid)0000-0003-1932-9300 aut Walcarius, Alain verfasserin aut Enthalten in Journal of electroanalytical chemistry New York, NY [u.a.] : Elsevier, 1959 872 Online-Ressource (DE-627)302466533 (DE-600)1491150-4 (DE-576)098614797 1873-2569 nnns volume:872 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 35.27 Elektrochemische Analyse AR 872
allfieldsGer	10.1016/j.jelechem.2020.113993 doi (DE-627)ELV004706846 (ELSEVIER)S1572-6657(20)30176-4 DE-627 ger DE-627 rda eng 540 620 DE-600 35.27 bkl Basnig, Deomila verfasserin aut Voltammetric behaviour of cationic redox probes at mesoporous silica film electrodes 2020 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The effect of vertically aligned silica nanochannels on the electrochemical response of various cationic redox probes has been investigated. To this end, an oriented mesoporous silica thin film has been generated by electro-assisted self-assembly onto a fluorine-doped tin oxide (FTO) electrode, which was then used to characterize the voltammetric behaviour of redox cations of different nature, size and charge. Methylene Blue (MB+), paraquat (PQ2+), diquat (DQ2+), ruthenium trisbipyridine (Ru(bpy)3 2+) and ruthenium hexamine (Ru(NH3)6 3+) were selected for that purpose. Multisweep cyclic voltammetry experiments showed significant accumulation of these cations thanks to favourable electrostatic interactions with the negatively-charge silica surface, but the enhancement of the votammetric signals compared to the bare FTO electrode was strongly dependent on the probe type, according the following trend: MB+ > PQ2+ > DQ2+ > Ru(bpy)3 2+ > Ru(NH3)6 3+. The accumulation processes were very fast owing to the vertical orientation of the mesopore channels ensuring fast diffusion from the solution to the electrode surface. Operating at various potential scan rates and different probe concentrations enabled to quantify the relative ratio between surface-confined and diffusion-controlled processes, the adsorption phenomena being clearly more prominent in diluted media and also accentuated at high potential scan rates. The mesoporous silica film electrodes exhibited higher sensitivities at lower concentrations, which can give benefits for sensor applications at trace levels. Mesoporous silica film Modified electrode Redox cations Permeability Diffusion Accumulation Vilá, Neus verfasserin aut Herzog, Grégoire verfasserin (orcid)0000-0003-1932-9300 aut Walcarius, Alain verfasserin aut Enthalten in Journal of electroanalytical chemistry New York, NY [u.a.] : Elsevier, 1959 872 Online-Ressource (DE-627)302466533 (DE-600)1491150-4 (DE-576)098614797 1873-2569 nnns volume:872 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 35.27 Elektrochemische Analyse AR 872
allfieldsSound	10.1016/j.jelechem.2020.113993 doi (DE-627)ELV004706846 (ELSEVIER)S1572-6657(20)30176-4 DE-627 ger DE-627 rda eng 540 620 DE-600 35.27 bkl Basnig, Deomila verfasserin aut Voltammetric behaviour of cationic redox probes at mesoporous silica film electrodes 2020 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The effect of vertically aligned silica nanochannels on the electrochemical response of various cationic redox probes has been investigated. To this end, an oriented mesoporous silica thin film has been generated by electro-assisted self-assembly onto a fluorine-doped tin oxide (FTO) electrode, which was then used to characterize the voltammetric behaviour of redox cations of different nature, size and charge. Methylene Blue (MB+), paraquat (PQ2+), diquat (DQ2+), ruthenium trisbipyridine (Ru(bpy)3 2+) and ruthenium hexamine (Ru(NH3)6 3+) were selected for that purpose. Multisweep cyclic voltammetry experiments showed significant accumulation of these cations thanks to favourable electrostatic interactions with the negatively-charge silica surface, but the enhancement of the votammetric signals compared to the bare FTO electrode was strongly dependent on the probe type, according the following trend: MB+ > PQ2+ > DQ2+ > Ru(bpy)3 2+ > Ru(NH3)6 3+. The accumulation processes were very fast owing to the vertical orientation of the mesopore channels ensuring fast diffusion from the solution to the electrode surface. Operating at various potential scan rates and different probe concentrations enabled to quantify the relative ratio between surface-confined and diffusion-controlled processes, the adsorption phenomena being clearly more prominent in diluted media and also accentuated at high potential scan rates. The mesoporous silica film electrodes exhibited higher sensitivities at lower concentrations, which can give benefits for sensor applications at trace levels. Mesoporous silica film Modified electrode Redox cations Permeability Diffusion Accumulation Vilá, Neus verfasserin aut Herzog, Grégoire verfasserin (orcid)0000-0003-1932-9300 aut Walcarius, Alain verfasserin aut Enthalten in Journal of electroanalytical chemistry New York, NY [u.a.] : Elsevier, 1959 872 Online-Ressource (DE-627)302466533 (DE-600)1491150-4 (DE-576)098614797 1873-2569 nnns volume:872 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 35.27 Elektrochemische Analyse AR 872
language	English
source	Enthalten in Journal of electroanalytical chemistry 872 volume:872
sourceStr	Enthalten in Journal of electroanalytical chemistry 872 volume:872
format_phy_str_mv	Article
bklname	Elektrochemische Analyse
institution	findex.gbv.de
topic_facet	Mesoporous silica film Modified electrode Redox cations Permeability Diffusion Accumulation
dewey-raw	540
isfreeaccess_bool	false
container_title	Journal of electroanalytical chemistry
authorswithroles_txt_mv	Basnig, Deomila @@aut@@ Vilá, Neus @@aut@@ Herzog, Grégoire @@aut@@ Walcarius, Alain @@aut@@
publishDateDaySort_date	2020-01-01T00:00:00Z
hierarchy_top_id	302466533
dewey-sort	3540
id	ELV004706846
language_de	englisch
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author	Basnig, Deomila
spellingShingle	Basnig, Deomila ddc 540 bkl 35.27 misc Mesoporous silica film misc Modified electrode misc Redox cations misc Permeability misc Diffusion misc Accumulation Voltammetric behaviour of cationic redox probes at mesoporous silica film electrodes
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topic_title	540 620 DE-600 35.27 bkl Voltammetric behaviour of cationic redox probes at mesoporous silica film electrodes Mesoporous silica film Modified electrode Redox cations Permeability Diffusion Accumulation
topic	ddc 540 bkl 35.27 misc Mesoporous silica film misc Modified electrode misc Redox cations misc Permeability misc Diffusion misc Accumulation
topic_unstemmed	ddc 540 bkl 35.27 misc Mesoporous silica film misc Modified electrode misc Redox cations misc Permeability misc Diffusion misc Accumulation
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title	Voltammetric behaviour of cationic redox probes at mesoporous silica film electrodes
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title_full	Voltammetric behaviour of cationic redox probes at mesoporous silica film electrodes
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author_browse	Basnig, Deomila Vilá, Neus Herzog, Grégoire Walcarius, Alain
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title_sort	voltammetric behaviour of cationic redox probes at mesoporous silica film electrodes
title_auth	Voltammetric behaviour of cationic redox probes at mesoporous silica film electrodes
abstract	The effect of vertically aligned silica nanochannels on the electrochemical response of various cationic redox probes has been investigated. To this end, an oriented mesoporous silica thin film has been generated by electro-assisted self-assembly onto a fluorine-doped tin oxide (FTO) electrode, which was then used to characterize the voltammetric behaviour of redox cations of different nature, size and charge. Methylene Blue (MB+), paraquat (PQ2+), diquat (DQ2+), ruthenium trisbipyridine (Ru(bpy)3 2+) and ruthenium hexamine (Ru(NH3)6 3+) were selected for that purpose. Multisweep cyclic voltammetry experiments showed significant accumulation of these cations thanks to favourable electrostatic interactions with the negatively-charge silica surface, but the enhancement of the votammetric signals compared to the bare FTO electrode was strongly dependent on the probe type, according the following trend: MB+ > PQ2+ > DQ2+ > Ru(bpy)3 2+ > Ru(NH3)6 3+. The accumulation processes were very fast owing to the vertical orientation of the mesopore channels ensuring fast diffusion from the solution to the electrode surface. Operating at various potential scan rates and different probe concentrations enabled to quantify the relative ratio between surface-confined and diffusion-controlled processes, the adsorption phenomena being clearly more prominent in diluted media and also accentuated at high potential scan rates. The mesoporous silica film electrodes exhibited higher sensitivities at lower concentrations, which can give benefits for sensor applications at trace levels.
abstractGer	The effect of vertically aligned silica nanochannels on the electrochemical response of various cationic redox probes has been investigated. To this end, an oriented mesoporous silica thin film has been generated by electro-assisted self-assembly onto a fluorine-doped tin oxide (FTO) electrode, which was then used to characterize the voltammetric behaviour of redox cations of different nature, size and charge. Methylene Blue (MB+), paraquat (PQ2+), diquat (DQ2+), ruthenium trisbipyridine (Ru(bpy)3 2+) and ruthenium hexamine (Ru(NH3)6 3+) were selected for that purpose. Multisweep cyclic voltammetry experiments showed significant accumulation of these cations thanks to favourable electrostatic interactions with the negatively-charge silica surface, but the enhancement of the votammetric signals compared to the bare FTO electrode was strongly dependent on the probe type, according the following trend: MB+ > PQ2+ > DQ2+ > Ru(bpy)3 2+ > Ru(NH3)6 3+. The accumulation processes were very fast owing to the vertical orientation of the mesopore channels ensuring fast diffusion from the solution to the electrode surface. Operating at various potential scan rates and different probe concentrations enabled to quantify the relative ratio between surface-confined and diffusion-controlled processes, the adsorption phenomena being clearly more prominent in diluted media and also accentuated at high potential scan rates. The mesoporous silica film electrodes exhibited higher sensitivities at lower concentrations, which can give benefits for sensor applications at trace levels.
abstract_unstemmed	The effect of vertically aligned silica nanochannels on the electrochemical response of various cationic redox probes has been investigated. To this end, an oriented mesoporous silica thin film has been generated by electro-assisted self-assembly onto a fluorine-doped tin oxide (FTO) electrode, which was then used to characterize the voltammetric behaviour of redox cations of different nature, size and charge. Methylene Blue (MB+), paraquat (PQ2+), diquat (DQ2+), ruthenium trisbipyridine (Ru(bpy)3 2+) and ruthenium hexamine (Ru(NH3)6 3+) were selected for that purpose. Multisweep cyclic voltammetry experiments showed significant accumulation of these cations thanks to favourable electrostatic interactions with the negatively-charge silica surface, but the enhancement of the votammetric signals compared to the bare FTO electrode was strongly dependent on the probe type, according the following trend: MB+ > PQ2+ > DQ2+ > Ru(bpy)3 2+ > Ru(NH3)6 3+. The accumulation processes were very fast owing to the vertical orientation of the mesopore channels ensuring fast diffusion from the solution to the electrode surface. Operating at various potential scan rates and different probe concentrations enabled to quantify the relative ratio between surface-confined and diffusion-controlled processes, the adsorption phenomena being clearly more prominent in diluted media and also accentuated at high potential scan rates. The mesoporous silica film electrodes exhibited higher sensitivities at lower concentrations, which can give benefits for sensor applications at trace levels.
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title_short	Voltammetric behaviour of cationic redox probes at mesoporous silica film electrodes
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author2	Vilá, Neus Herzog, Grégoire Walcarius, Alain
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doi_str	10.1016/j.jelechem.2020.113993
up_date	2024-07-06T23:53:24.807Z
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Voltammetric behaviour of cationic redox probes at mesoporous silica film electrodes

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