Ni 0.85 Co 0.15 WO 4 for Photocatalytic Reduction of CO 2 Under Mild Conditions with High Activity and Selectivity
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Ni0.85Co0.15WO4 for Photocatalytic Reduction of CO2 Under Mild Conditions with High Activity and Selectivity Chunmei Guo1 · Biao Guo1 · Xiaosu Gao1 · Jing Liang1 · Qide Meng1 · Jinxuan Liu1 Received: 31 December 2019 / Accepted: 21 April 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Efficient catalysts play an important role in photoreduction of greenhouse gases (CO2 etc.) to value-added chemicals such as CO. In this work, we synthesized a series of Ni1−xCoxWO4 (x = 0–1) catalysts by chemical co-deposition method. Among the prepared materials, Ni0.85Co0.15WO4 exhibits superior catalytic performance for photocatalytic reduction of CO2 to CO with [Ru(bpy)3]Cl2·6H2O as the photosensitizer. The productivity and selectivity of CO are 14.33 mmol g−1 h−1 and 86.4%, respectively under visible light irradiation. The experimental results demonstrate that superiority of electron conductivity of metal tungstates and the high activity of Co active sites facilitate the separation and transfer of photo-induced charges and lead to the excellent performance of photcatalytic reduction of CO2 to CO. Graphic Abstract Ni0.85Co0.15WO4,combining the superiority of electron conductivity of metal tungstates with the high activity of Co active sites, exhibits high productivity and selectivity of CO in photo-reduction of CO2.
Keywords Heterogeneous catalysis · Photocatalysis · XPS · CO2 reduction · Ni0.85co0.15WO4
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10562-020-03234-8) contains supplementary material, which is available to authorized users. * Jinxuan Liu [email protected] Extended author information available on the last page of the article
1 Introduction The greenhouse gases such as C O2 produced from the consumption of non-renewable fossil fuels have caused severe environmental problems [1]. Utilization of clean energies for the conversion of CO 2 to value-added chemicals is
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highly desired in order to alleviate energy shortage and environmental problem for sustainable development. Strategies such as photocatalysis, electrocatalysis, and photoelectroncatalysis [2–4], have been developed to convert CO2 to renewable fuels such as carbon monoxide, formic acid, methanol, etc. Among aforementioned strategies of C O2 conversion, photocatalytic reduction of C O2 has attracted widespread attention due to the utilization of sustainable solar energy. Moreover, photocatalytic reduction of CO2 in a heterogeneous system shows better stability and the catalysts are easier to be recycled compared to homogeneous system [5]. The heterogeneous catalysts for photocatalytic reduction of C O2 can be classified into three categories: noble metal-based catalysts (Pt, Ag, Pd, etc.), [6–8] non-noble metal-based catalysts (oxides, sulfides, metal–organic frameworks (MOFs), etc.) [9–11] and biocatalysts [12]. Among the catalysts mentioned above employed in photocatalytic reduction of C O2 to CO, Co-based catal
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