期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 12, 期 10, 页码 1111-1119出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201700292
关键词
Au cathode; hydrogen carbonate; hydrogen peroxide; solar light; WO3/BiVO4 photoanode
资金
- JSPS KAKENHI [26810105]
- International Joint Research Program for Innovative Energy Technology
- Grants-in-Aid for Scientific Research [26810105] Funding Source: KAKEN
The photoelectrochemical production and degradation properties of hydrogen peroxide (H2O2) were investigated on a WO3/BiVO4 photoanode in an aqueous electrolyte of hydrogen carbonate (HCO3-). High concentrations of HCO3- species rather than CO32- species inhibited the oxidative degradation of H2O2 on the WO3/BiVO4 photoanode, resulting in effective oxidative H2O2 generation and accumulation from water (H2O). Moreover, the Au cathode facilitated two-electron reduction of oxygen (O-2), resulting in reductive H2O2 production with high current efficiency. Combining the WO3/BiVO4 photoanode with a HCO3- electrolyte and an Au cathode also produced a clean and promising design for a photoelectrode system specializing in H2O2 production (eta(anode)(H2O2) approximate to 50%, eta(anode)(H2O2) approximate to 90%) even without applied voltage between the photoanode and cathode under simulated solar light through a two-photon process; this achieved effective H2O2 production when using an Au-supported porous BiVO4 photocatalyst sheet.
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