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.
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
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.
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U2 - 10.1039/c2ee02929d
DO - 10.1039/c2ee02929d
M3 - Article
AN - SCOPUS:84856754662
VL - 5
SP - 5694
EP - 5700
JO - Energy and Environmental Science
JF - Energy and Environmental Science
SN - 1754-5692
IS - 2
ER -