光电流
材料科学
异质结
覆盖层
分解水
可逆氢电极
纳米棒
原子层沉积
电极
光催化
化学工程
光电化学
分析化学(期刊)
纳米技术
光电子学
电化学
图层(电子)
催化作用
工作电极
化学
工程类
色谱法
物理化学
生物化学
作者
Chengcheng Li,Tuo Wang,Zhibin Luo,Shanshan Liu,Jinlong Gong
出处
期刊:Small
[Wiley]
日期:2016-05-19
卷期号:12 (25): 3415-3422
被引量:124
标识
DOI:10.1002/smll.201600940
摘要
Hematite suffers from poor charge transport and separation properties for solar water splitting. This paper describes the design and fabrication of a 3D Fe 2 O 3 /Fe 2 TiO 5 heterojunction photoanode with improved charge separation, via a facile hydrothermal method followed by atomic layer deposition and air annealing. A highly crystallized Fe 2 TiO 5 phase forms with a distinct interface with the underlying Fe 2 O 3 core, where a 4 nm Fe 2 TiO 5 overlayer leads to the best photoelectrochemical performance. The favorable band offset between Fe 2 O 3 and Fe 2 TiO 5 establishes a type‐II heterojunction at the Fe 2 O 3 /Fe 2 TiO 5 interface, which drives electron–hole separation effectively. The Fe 2 O 3 /Fe 2 TiO 5 composite electrode exhibits a dramatically improved photocurrent of 1.63 mA cm −2 at 1.23 V versus reversible hydrogen electrode (RHE) under simulated 1 sun illumination (100 mW cm −2 ), which is 3.5 times that of the bare Fe 2 O 3 electrode. Decorating the Fe 2 O 3 /Fe 2 TiO 5 heterojunction photoanode with earth‐abundant FeNiO x cocatalyst further expedites surface reaction kinetics, leading to an onset potential of 0.8 V versus RHE with a photocurrent of 2.7 mA cm −2 at 1.23 V and 4.6 mA cm −2 at 1.6 V versus RHE. This sandwich photoanode shows an excellent stability for 5 h and achieves an overall Faradaic efficiency of 95% for O 2 generation. This is the best performance ever reported for Fe 2 O 3 /Fe 2 TiO 5 photoanodes.
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