Silver nanoparticle assemblies supported on glassy-carbon electrodes for the electro-analytical detection of hydrogen peroxide.
Electrochemical detection of hydrogen peroxide using an edge-plane pyrolytic-graphite electrode (EPPG), a glassy carbon (GC) electrode, and a silver nanoparticle-modified GC electrode is reported. It is shown, in phosphate buffer (0.05 mol L(-1), pH 7.4), that hydrogen peroxide cannot be detected di...
| Main Authors: | , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
2005
|
| _version_ | 1797089622321266688 |
|---|---|
| author | Welch, C Banks, C Simm, A Compton, R |
| author_facet | Welch, C Banks, C Simm, A Compton, R |
| author_sort | Welch, C |
| collection | OXFORD |
| description | Electrochemical detection of hydrogen peroxide using an edge-plane pyrolytic-graphite electrode (EPPG), a glassy carbon (GC) electrode, and a silver nanoparticle-modified GC electrode is reported. It is shown, in phosphate buffer (0.05 mol L(-1), pH 7.4), that hydrogen peroxide cannot be detected directly on either the EPPG or GC electrodes. However, reduction can be facilitated by modification of the glassy-carbon surface with nanosized silver assemblies. The optimum conditions for modification of the GC electrode with silver nanoparticles were found to be deposition for 1 min at -0.5 V vs. Ag from 5 mmol L(-1) AgNO3/0.1 mol L(-1) TBAP/MeCN, followed by stripping for 2 min at +0.5 V vs. Ag in the same solution. A wave, due to the reduction of hydrogen peroxide on the silver nanoparticles is observed at -0.68 V vs. SCE. The limit of detection for this modified nanosilver electrode was 2.0 x 10(-6) mol L(-1) for hydrogen peroxide in phosphate buffer (0.05 mol L(-1), pH 7.4) with a sensitivity which is five times higher than that observed at a silver macro-electrode. Also observed is a shoulder on the voltammetric wave corresponding to the reduction of oxygen, which is produced by silver-catalysed chemical decomposition of hydrogen peroxide to water and oxygen then oxygen reduction at the surface of the glassy-carbon electrode. |
| first_indexed | 2024-03-07T03:06:41Z |
| format | Journal article |
| id | oxford-uuid:b2c7e430-f015-407a-8e12-446e4dc0068c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:06:41Z |
| publishDate | 2005 |
| record_format | dspace |
| spelling | oxford-uuid:b2c7e430-f015-407a-8e12-446e4dc0068c2022-03-27T04:14:10ZSilver nanoparticle assemblies supported on glassy-carbon electrodes for the electro-analytical detection of hydrogen peroxide.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b2c7e430-f015-407a-8e12-446e4dc0068cEnglishSymplectic Elements at Oxford2005Welch, CBanks, CSimm, ACompton, RElectrochemical detection of hydrogen peroxide using an edge-plane pyrolytic-graphite electrode (EPPG), a glassy carbon (GC) electrode, and a silver nanoparticle-modified GC electrode is reported. It is shown, in phosphate buffer (0.05 mol L(-1), pH 7.4), that hydrogen peroxide cannot be detected directly on either the EPPG or GC electrodes. However, reduction can be facilitated by modification of the glassy-carbon surface with nanosized silver assemblies. The optimum conditions for modification of the GC electrode with silver nanoparticles were found to be deposition for 1 min at -0.5 V vs. Ag from 5 mmol L(-1) AgNO3/0.1 mol L(-1) TBAP/MeCN, followed by stripping for 2 min at +0.5 V vs. Ag in the same solution. A wave, due to the reduction of hydrogen peroxide on the silver nanoparticles is observed at -0.68 V vs. SCE. The limit of detection for this modified nanosilver electrode was 2.0 x 10(-6) mol L(-1) for hydrogen peroxide in phosphate buffer (0.05 mol L(-1), pH 7.4) with a sensitivity which is five times higher than that observed at a silver macro-electrode. Also observed is a shoulder on the voltammetric wave corresponding to the reduction of oxygen, which is produced by silver-catalysed chemical decomposition of hydrogen peroxide to water and oxygen then oxygen reduction at the surface of the glassy-carbon electrode. |
| spellingShingle | Welch, C Banks, C Simm, A Compton, R Silver nanoparticle assemblies supported on glassy-carbon electrodes for the electro-analytical detection of hydrogen peroxide. |
| title | Silver nanoparticle assemblies supported on glassy-carbon electrodes for the electro-analytical detection of hydrogen peroxide. |
| title_full | Silver nanoparticle assemblies supported on glassy-carbon electrodes for the electro-analytical detection of hydrogen peroxide. |
| title_fullStr | Silver nanoparticle assemblies supported on glassy-carbon electrodes for the electro-analytical detection of hydrogen peroxide. |
| title_full_unstemmed | Silver nanoparticle assemblies supported on glassy-carbon electrodes for the electro-analytical detection of hydrogen peroxide. |
| title_short | Silver nanoparticle assemblies supported on glassy-carbon electrodes for the electro-analytical detection of hydrogen peroxide. |
| title_sort | silver nanoparticle assemblies supported on glassy carbon electrodes for the electro analytical detection of hydrogen peroxide |
| work_keys_str_mv | AT welchc silvernanoparticleassembliessupportedonglassycarbonelectrodesfortheelectroanalyticaldetectionofhydrogenperoxide AT banksc silvernanoparticleassembliessupportedonglassycarbonelectrodesfortheelectroanalyticaldetectionofhydrogenperoxide AT simma silvernanoparticleassembliessupportedonglassycarbonelectrodesfortheelectroanalyticaldetectionofhydrogenperoxide AT comptonr silvernanoparticleassembliessupportedonglassycarbonelectrodesfortheelectroanalyticaldetectionofhydrogenperoxide |