期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 10, 页码 3403-3407出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201510869
关键词
acid treatment; hematite; metal oxides; photoelectrochemical water splitting; transient absorption spectroscopy
资金
- EPSRC [EP/K006851/1]
- U.S. NSF MRI [MRI-1126845]
- Engineering and Physical Sciences Research Council [EP/K006851/1, 1369857] Funding Source: researchfish
- EPSRC [EP/K006851/1] Funding Source: UKRI
We report a strategy for efficient suppression of electron-hole recombination in hematite photoanodes. Acid-treated hematite showed a substantially enhanced photocurrent density compared to untreated samples. Electrochemical impedance spectroscopy studies revealed that the enhanced photocurrent is partly due to improved efficiency of charge separation. Transient absorption spectroscopic studies coupled to electrochemical measurements indicate that, in addition to improved bulk electrochemical properties, acid-treated hematite has significantly decreased surface electron-hole recombination losses owing to a greater yield of the trapped photoelectrons being extracted to the external circuit.
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