Rational Regulation of Electronic Structure in Layered Double Hydroxide Via Vanadium Incorporation to Trigger Highly Selective CO 2 Photoreduction to CH 4

作者：Sha Yu, Ling Tan, Sha Bai, Chenjun Ning, Guihao Liu, Huijuan Wang, Bin Liu, Yufei Zhao, Yu‐Fei Song · 发表于：Small · 年份：2022 · DOI：10.1002/smll.202202334 · 被引用次数：39 · 研究领域：Advanced Photocatalysis Techniques、Carbon dioxide utilization in catalysis、Catalytic Processes in Materials Science

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.