期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 600, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2020.124912
关键词
g-C3N4; NiS2 quantum dots; CO2 reduction; Photocatalysis; In situ DRIFT study
资金
- National Key R&D Program of China [2018YFB0605002]
Photoreduction carbon dioxide to hydrocarbons has been recognized as one of the most promising and sustainable solutions to realize solar-to-chemical energy conversion and alleviate environmental pollution. Herein, we prepared g-C3N4 photocatalyst modified by NiS2 quantum dots as co-catalyst based on a seed-mediated hydrothermal process. The composite showed superior activity and stability in photocatalytic CO2 reduction. The highest CO evolution rate of 10.68 mu mol h(-1) g(-1) was obtained on NSQD/CN-25 catalyst, which was 3.88-fold as high as unadulterated g-C3N4, and its apparent quantum efficiency (AQE) was 2.03% at 420 nm. During the photoconversion process, the possible intermediate products (such as COO-, CO2- and HCO3-) were detected by in situ FTIR analysis. Notably, the electron transfer from g-C3N4 to NiS2 QDs could effectively accelerate the separation of photoexcited electron-hole pairs. This work paves a new strategy toward designing cost-effective photocatalyst with high performance for photocatalytic CO2 reduction.
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