期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 25, 页码 16071-16077出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b04142
关键词
photoelectrochemical water splitting; hematite; Ti dopant; surface engineering; synergistic effect
资金
- National Natural Science Foundation of China [21376104]
- Natural Science Foundation of Guangdong Province, China [2014A030306010, 2014A030310302]
One of the most promising candidates for photoelectrochemical (PEC) water splitting photoanode is hematite (alpha-Fe2O3) due to its narrow bandgap and chemical stability. However, the poor bulk/surface kinetics of hematite limits its PEC performance. Herein, a facile two-step approach is reported to synergistically improve the PEC performance of Fe2O3. First, through bulk engineering of Ti doping, the photocurrent density of Ti-Fe2O3 photoanode (1.68 mA cm(-2) at 1.23 V-RHE) shows a 3-fold increase compared with that of pure Fe2O3 photoanode (0.50 mA cm(-2) at 1.23 V-RHE). Second, the photocurrent density of Ti-Fe2O3 photoanode could be further enhanced to 2.31 mA cm(-2) by surface engineering of FeOOH. The enhanced PEC water splitting performance is proposed to be the synergistic effect of bulk and surface engineering, which can be mainly attributed to the great increase of charge separation efficiency and surface transfer efficiency.
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