The oxygen reduction reaction at silver electrodes in high chloride media and the implications for silver nanoparticle toxicity
The oxygen reduction reaction (ORR) at neutral pH in various aqueous chloride-containing solutions was investigated voltammetrically. In particular, the ORR was performed in high chloride containing aqueous media including authentic and synthetic seawater under oxygen saturated conditions and compar...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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Royal Society of Chemistry
2020
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| _version_ | 1797070889131442176 |
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| author | Guo, Y Yang, M Xie, R Compton, R |
| author_facet | Guo, Y Yang, M Xie, R Compton, R |
| author_sort | Guo, Y |
| collection | OXFORD |
| description | The oxygen reduction reaction (ORR) at neutral pH in various aqueous chloride-containing solutions was investigated voltammetrically. In particular, the ORR was performed in high chloride containing aqueous media including authentic and synthetic seawater under oxygen saturated conditions and compared with that in aqueous nitrate and perchlorate media. The experimental voltammograms revealed a two-electron process forming hydrogen peroxide in low chloride media. In contrast, high concentration chloride solutions, including both synthetic and authentic seawater showed an increase of overpotential, accompanied by a splitting of the voltammetric peak into two one-electron features indicating the formation of superoxide in the first step and its release from the silver-solution interface. The implications for silver nanoparticle toxicology are discussed given the markedly greater toxicity of superoxide over peroxide and the high levels of chloride in biological media as well as in seawater. |
| first_indexed | 2024-03-06T22:45:30Z |
| format | Journal article |
| id | oxford-uuid:5d0735bd-c7d7-4462-9c83-4fe7738d1dcd |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T22:45:30Z |
| publishDate | 2020 |
| publisher | Royal Society of Chemistry |
| record_format | dspace |
| spelling | oxford-uuid:5d0735bd-c7d7-4462-9c83-4fe7738d1dcd2022-03-26T17:31:52ZThe oxygen reduction reaction at silver electrodes in high chloride media and the implications for silver nanoparticle toxicityJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:5d0735bd-c7d7-4462-9c83-4fe7738d1dcdEnglishSymplectic ElementsRoyal Society of Chemistry2020Guo, YYang, MXie, RCompton, RThe oxygen reduction reaction (ORR) at neutral pH in various aqueous chloride-containing solutions was investigated voltammetrically. In particular, the ORR was performed in high chloride containing aqueous media including authentic and synthetic seawater under oxygen saturated conditions and compared with that in aqueous nitrate and perchlorate media. The experimental voltammograms revealed a two-electron process forming hydrogen peroxide in low chloride media. In contrast, high concentration chloride solutions, including both synthetic and authentic seawater showed an increase of overpotential, accompanied by a splitting of the voltammetric peak into two one-electron features indicating the formation of superoxide in the first step and its release from the silver-solution interface. The implications for silver nanoparticle toxicology are discussed given the markedly greater toxicity of superoxide over peroxide and the high levels of chloride in biological media as well as in seawater. |
| spellingShingle | Guo, Y Yang, M Xie, R Compton, R The oxygen reduction reaction at silver electrodes in high chloride media and the implications for silver nanoparticle toxicity |
| title | The oxygen reduction reaction at silver electrodes in high chloride media and the implications for silver nanoparticle toxicity |
| title_full | The oxygen reduction reaction at silver electrodes in high chloride media and the implications for silver nanoparticle toxicity |
| title_fullStr | The oxygen reduction reaction at silver electrodes in high chloride media and the implications for silver nanoparticle toxicity |
| title_full_unstemmed | The oxygen reduction reaction at silver electrodes in high chloride media and the implications for silver nanoparticle toxicity |
| title_short | The oxygen reduction reaction at silver electrodes in high chloride media and the implications for silver nanoparticle toxicity |
| title_sort | oxygen reduction reaction at silver electrodes in high chloride media and the implications for silver nanoparticle toxicity |
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