Carbon Dioxide Conversion with High-Performance Photocatalysis into Methanol on NiSe 2 /WSe 2

Zheng Luo, Yinghan Li, Fengbo Guo, Kaizhi Zhang, Kankan Liu, Wanli Jia, Yuxia Zhao and Yan Sun
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Zheng Luo: Department of Civil and Environmental Engineering, University of Washington, Seattle, WA 98195, USA
Yinghan Li: Department of Civil and Environmental Engineering, University of Washington, Seattle, WA 98195, USA
Fengbo Guo: School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China
Kaizhi Zhang: School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China
Kankan Liu: School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China
Wanli Jia: School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China
Yuxia Zhao: School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China
Yan Sun: School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China

Energies, 2020, vol. 13, issue 17, 1-11

Abstract: Climate change has been recognized as a threatening environmental problem around the world. CO 2 is considered to be the main component of greenhouse gas. By using solar energy (light energy) as the energy source, photocatalytic conversion is one of the most effective technologies to reveal the clean utilization of CO 2 . Herein, using sodium tungstate, nickel nitrate, and selenium powder as the main raw materials, the high absorption and utilization of WSe 2 for light energy and the high intrinsic conductivity of NiSe 2 were combined by a hydrothermal method to prepare NiSe 2 /WSe 2 and hydrazine hydrate as the reductant. Then, high-performance NiSe 2 /WSe 2 photocatalytic material was prepared. The characterization results of XRD, XPS, SEM, specific surface area, and UV-visible spectroscopy show that the main diffraction peak of synthesized NiSe 2 /WSe 2 is sharp, which basically coincides with the standard card. After doping NiSe 2 , the morphology of WSe 2 was changed from a flake shape to smaller and more trivial crystal flakes, which demonstrates richer exposed edges and more active sites; the specific surface area increased from 3.01 m 2 g −1 to 8.52 m 2 g −1 , and the band gap becomes wider, increasing from 1.66 eV to 1.68 eV. The results of a photocatalytic experiment show that when the prepared NiSe 2 /WSe 2 catalyst is used to conduct photocatalytic reduction of CO 2 , the yield of CH 3 OH is significantly increased. After reaction for 10 h, the maximum yield could reach 3.80 mmol g −1 , which presents great photocatalytic activity.

Keywords: NiSe 2 /WSe 2; photocatalysis; CO 2; methanol (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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