光电流
共价键
分解水
异质结
析氧
材料科学
可逆氢电极
化学工程
赤铁矿
电极
光催化
光电子学
光化学
电化学
纳米技术
光电化学电池
可见光谱
光电化学
化学
催化作用
物理化学
参比电极
生物化学
有机化学
冶金
作者
Yan Zhang,Yuan Huang,Shi-Shi Zhu,Yuanyuan Liu,Xing Zhang,Jianjun Wang,Artur Braun
出处
期刊:Small
[Wiley]
日期:2021-06-21
卷期号:17 (30)
被引量:58
标识
DOI:10.1002/smll.202100320
摘要
Abstract The severe charge recombination and the sluggish kinetic for oxygen evolution reaction have largely limited the application of hematite (α‐Fe 2 O 3 ) for water splitting. Herein, the construction of Cu 2 S/Fe 2 O 3 heterojunction and discover that the formation of covalent SO bonds between Cu 2 S and Fe 2 O 3 can significantly improve the photoelectrochemical performance and stability for water splitting is reported. Compared with bare Fe 2 O 3 , the heterostructure of Cu 2 S/Fe 2 O 3 endows the resulting electrode with enhanced charge separation and transfer, extended range for light absorption, and reduced charge recombination rate. Additionally, due to the photothermal properties of Cu 2 S, the heterostructure exhibits locally a higher temperature under illumination, profitable for increasing the rate of oxygen evolution reaction. Consequently, the photocurrent density of the heterostructure is enhanced by 177% to be 1.19 mA cm −2 at 1.23 V versus reversible hydrogen electrode. This work may provide guideline for future in the design and fabrication of highly efficient photoelectrodes for various reactions.
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