期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 10, 期 27, 页码 8825-8834出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.2c01564
关键词
KEYWORDS; Cu 2 ZnSnS 4; Photocatalysis; Self-codoping; Energy level engineering; CO 2 reduction
资金
- National Natural Science Foundation of China [21972020]
- Major Program of Qingyuan Innovation Laboratory [00121001]
- Natural Science Foundation of Fujian Province of PR China [2020L3003]
This study demonstrates the ability to tune the energy level of photocatalysts by self-codoping low-valence Sn2+ and high-valence Cu2+ ions, leading to a change in semiconductor behavior and improved CO2 photoreduction performance. The versatile approach of different valence metal ion self-codoping offers a powerful technique for engineering the energy level of multimetal semiconductor photocatalysts.
ABSTRACT: Energy level engineering is a powerful technique to tune the electron transport and the photocatalytic properties of photocatalysts with low-valence Sn2+ and high-valence Cu2+ selfcodoping by solvothermal method. The band gap energy level and Fermi level of Cu2ZnSnS4 nanosheets can be adjusted by controlling Sn2+ and Cu2+ self-codoping at different solvothermal temperature. This leads to semiconductor behavior change from p-type of the intrinsic Cu2ZnSnS4 to the n-type of self-codoped sample. The n-type Cu2ZnSnS4 nanosheets exhibit a good CO2 photoreduction performance to yield 48.14 and 25.04 mu mol g-1 h-1 of CO and CH4, where CO yields on n-type Cu2ZnSnS4 is about 4 times higher than that on the intrinsic Cu2ZnSnS4. This work offers a versatile approach of different valence metal ion self-codoping to engineer the energy level of multimetal semiconductor photocatalyst.
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