Coal-based porous carbon supported Cu-Ni alloy for photocatalytic reduction of CO2
Source abstract
Abstract
One of the most effective strategies for addressing energy shortages and the greenhouse effect is the value-added conversion of carbon dioxide (CO 2) using solar energy. In this study, a coal-based porous carbon (PC)-supported copper-nickel (CuNi) alloy catalyst (Cu xNi y/PC) was prepared using low-rank coal for the photocatalytic reduction of CO 2 to methanol (CH 3OH). A comprehensive analysis of the catalysts has been conducted using a variety of characterisation tools, including XRD, SEM, TEM, BET, CO 2-TPD, and EDX. Furthermore, the light absorption properties and charge transport mechanisms of the composites were subjected to comprehensive investigation through the use of UV–vis DRS, PL spectroscopy, and photoelectrochemical tests. The results demonstrated that the Cu 1Ni 1/PC catalyst exhibited (excellent) photocatalytic CO 2 reduction reaction (CO 2RR) performance, achieving CH 3OH yields of up to 1122.3 µmol g cat −1 under light, which was markedly superior to those of single Cu/PC, Ni/PC, and PC. The combination of experimental data and density functional theory (DFT) calculations confirmed the close link between the synergistic interaction between the bimetals and the catalytic activity. Further electronic structure analysis showed that the coupling between the Cu and Ni d-orbitals leaded to a redistribution of the surface charge, resulting in a lower free energy for the Cu Ni alloy sites, which was thermodynamically favourable for the catalytic conversion of CO 2.
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Research context
OpenAlex topics: Catalytic Processes in Materials Science · CO2 Reduction Techniques and Catalysts · Advanced Photocatalysis Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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