Catalyst for preparing formic acid through efficient electrocatalytic reduction of carbon dioxide and preparation method thereof

Abstract

The invention relates to a catalyst for preparing formic acid through efficient electrocatalytic reduction of carbon dioxide and a preparation method thereof, and belongs to the technical field of electrocatalysis. According to the preparation method, SnS2 nanosheets are used as precursors, and the black porous SnO2 nanosheet catalyst for preparing formic acid through efficient electrocatalytic reduction of carbon dioxide is prepared through high-temperature calcination and annealing processes. The method specifically comprises the following steps: (1) preparing a SnS2 nanosheet precursor through chemical vapor deposition; (2) calcining the SnS2 precursor in air to obtain a white porous SnO2 nanosheet; and (3) annealing the white SnO2 nanosheet in a mixed atmosphere of hydrogen and argon to obtain the black porous SnO2 nanosheet. The catalyst for electrocatalytic reduction of carbon dioxide shows excellent performance of preparing formic acid by electrocatalytic reduction of carbon dioxide. Under the overpotential of 0.51 V, the voltage of the capacitor is reduced; the Faraday conversion efficiency of converting carbon dioxide into formic acid reaches 92.4%; the Faraday conversionefficiency of formic acid within the voltage range of -0.60 V to -1.10 V (relative to a reversible hydrogen electrode, RHE) can be stabilized at 90+/-2%; and obtaining a current density of 11.4 +/- 0.3 mA/cm2 and a formic acid Faraday conversion efficiency of 90+/-0.5% at -1.10 V (relative to the reversible hydrogen electrode, RHE) for at least 10 hours.

Description

technical field [0001] The invention relates to a catalyst for preparing formic acid by electrocatalytically reducing carbon dioxide with high efficiency and a preparation method thereof, belonging to the field of electrocatalysis. Background technique [0002] The development of carbon dioxide utilization and conversion technology is not only expected to alleviate the greenhouse effect and even the energy crisis, but also has great and far-reaching strategic significance for the realization of energy conservation, emission reduction and low-carbon economy. Compared with other carbon dioxide reduction technologies, electrocatalytic reduction has the advantages of low energy consumption, simple operation, and strong controllability, and has become a carbon dioxide conversion path that has attracted much attention. Although in recent years, various types of catalysts including metals, metal oxides, metal sulfides, and carbon-based materials have been developed for the electroc...

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Problems solved by technology

However, how to increase the number of active sites while maintaining high conductivity is still a major challenge in the design and preparation of electrocatalytic carbon dioxide reduction catalysts.

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