赤铁矿
微观结构
材料科学
分解水
单位(环理论)
工程物理
冶金
化学
物理
心理学
光催化
生物化学
数学教育
催化作用
作者
Cheng Lü,Kun Feng,Chang Li,Jinming Xu,Shuo Li,Yong Feng,Yong Zhu,Shifeng Wang,Jun Zhong
出处
期刊:ACS materials letters
[American Chemical Society]
日期:2024-03-22
卷期号:: 1571-1580
标识
DOI:10.1021/acsmaterialslett.4c00183
摘要
The local atomic structure in hematite determines its intrinsic property for photoelectrochemical water splitting, but its precise design has rarely been clearly demonstrated. Here by inserting Ge atoms into a hematite lattice with abundant vacancies, the local environment around Fe can be significantly modulated with the formation of a distorted Ge–O–Fe microstructure, which serves as an active catalytic unit to lower the energy barrier for an efficient oxygen evolution reaction. As a result, the optimized Ge–Fe2O3 (LV) photoanode exhibits an excellent photocurrent density of 4.04 mA/cm2 at 1.23 VRHE, which is 5.0 times higher than that of pristine Fe2O3 (0.80 mA/cm2). It can further achieve 5.09 mA/cm2 at 1.23 VRHE (stable over 100 h) by coupling with FeNiOOH. Furthermore, when connecting the Ge-based hematite with a commercial solar cell, the all-solar-driven system can realize an outstanding solar-to-hydrogen efficiency of up to 5.3%, standing for the top value for hematite-based systems. The Ge–O–Fe unit induced catalytic performance enhancement may shed light on the design of efficient catalysts for solar water splitting.
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