Abstract
The faradaic efficiency for O 2(g) evolution at thin-film WO 3 photoanodes has been evaluated in a series of acidic aqueous electrolytes. In 1.0 M H 2SO 4, persulfate was the predominant photoelectrochemical oxidation product, and no O 2 was detected unless catalytic quantities of Ag +(aq) were added to the electrolyte. In contact with 1.0 M HClO 4, dissolved O 2 was observed with nearly unity faradaic efficiency, but addition of a hole scavenger, 4-cyanopyridine N-oxide, completely suppressed O 2 formation. In 1.0 M HCl, Cl 2(g) was the primary oxidation product. These results indicate that at WO 3 photoanodes, water oxidation is dominated by oxidation of the acid anions in 1.0 M HCl, H 2SO 4, and HClO 4, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 5694-5700 |
| Number of pages | 7 |
| Journal | Energy and Environmental Science |
| Volume | 5 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Feb 1 2012 |
ASJC Scopus subject areas
- Environmental Chemistry
- Renewable Energy, Sustainability and the Environment
- Nuclear Energy and Engineering
- Pollution
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Mi, Q., Zhanaidarova, A., Brunschwig, B. S., Gray, H. B., & Lewis, N. S. (2012). A quantitative assessment of the competition between water and anion oxidation at WO 3 photoanodes in acidic aqueous electrolytes. Energy and Environmental Science, 5(2), 5694-5700. https://doi.org/10.1039/c2ee02929d