选择性
层状双氢氧化物
钒
氢氧化物
价(化学)
电化学
材料科学
电子转移
辐照
无机化学
摩尔比
光化学
催化作用
化学
电极
物理化学
有机化学
物理
核物理学
作者
Sha Yu,Ling Tan,Sha Bai,Chenjun Ning,Guihao Liu,Huijuan Wang,Bin Liu,Yufei Zhao,Yu‐Fei Song
出处
期刊:Small
[Wiley]
日期:2022-08-07
卷期号:18 (35)
被引量:13
标识
DOI:10.1002/smll.202202334
摘要
Abstract To realize excellent selectivity of CH 4 in CO 2 photoreduction (CO 2 PR) is highly desirable, yet which is challenging due to the limited active sites for CH 4 generation and severe electron‐hole recombination on photocatalysts. Herein, based on the theoretically calculated effects of vanadium incorporation into the laminate of layered double hydroxides (LDHs), V into NiAl‐LDH to synthesize a series of LDHs with various V contents is introduced. NiV‐LDH is revealed to afford a high CH 4 selectivity (78.9%), and extremely low H 2 selectivity (only 0.4%) under λ > 400 nm irradiation. By further tuning the molar ratio of Ni to V, a CH 4 selectivity of as high as 90.1% is achieved on Ni 4 V‐LDH, and H 2 is completely prohibited on Ni 2 V‐LDH. Fine structural characterizations and comprehensive optical and electrochemical studies uncover V incorporation creates the lower‐valence Ni species as active sites for generating CH 4 , and enhances the generation, separation, and transfer of photogenerated carriers.
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