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 2012 |
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ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Environmental Chemistry
- Pollution
- Nuclear Energy and Engineering
Cite this
A quantitative assessment of the competition between water and anion oxidation at WO 3 photoanodes in acidic aqueous electrolytes. / Mi, Qixi; Zhanaidarova, Almagul; Brunschwig, Bruce S.; Gray, Harry B.; Lewis, Nathan S.
In: Energy and Environmental Science, Vol. 5, No. 2, 02.2012, p. 5694-5700.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - A quantitative assessment of the competition between water and anion oxidation at WO 3 photoanodes in acidic aqueous electrolytes
AU - Mi, Qixi
AU - Zhanaidarova, Almagul
AU - Brunschwig, Bruce S.
AU - Gray, Harry B.
AU - Lewis, Nathan S
PY - 2012/2
Y1 - 2012/2
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84856754662&partnerID=8YFLogxK
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U2 - 10.1039/c2ee02929d
DO - 10.1039/c2ee02929d
M3 - Article
VL - 5
SP - 5694
EP - 5700
JO - Energy and Environmental Science
JF - Energy and Environmental Science
SN - 1754-5692
IS - 2
ER -