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- W2887941047 abstract "CuWO4 is a potential photoanode candidate with a band gap of 2.2–2.4 eV for photoelectrochemical (PEC) water oxidation in neutral electrolytes. We present a facile method to improve the PEC efficiency of CuWO4 thin-film photoanodes by postannealing in a nitrogen atmosphere at 623 K for 3.5 h. The photocurrent increases from 30 to 80 μA cm–2 at 1.23 V versus reversible hydrogen electrode under AM 1.5G illumination in a phosphate buffer electrolyte at pH 7 after the nitrogen treatment. We investigate the origin of the amended photocurrents by means of ultraviolet–visible spectroscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy, and electrochemical impedance spectroscopy. Annealing of CuWO4 thin films in a nitrogen atmosphere at 623 K does not yield a bathochromic effect, that is, nitrogen is not being incorporated into the crystal structure. The better PEC performance is due to the greater concentration of oxygen vacancies, improved charge carrier separation, and reduction of charge-transfer..." @default.
- W2887941047 created "2018-08-22" @default.
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- W2887941047 date "2018-08-06" @default.
- W2887941047 modified "2023-09-24" @default.
- W2887941047 title "Augmenting the Photocurrent of CuWO<sub>4</sub> Photoanodes by Heat Treatment in the Nitrogen Atmosphere" @default.
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- W2887941047 doi "https://doi.org/10.1021/acs.jpcc.8b02828" @default.
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