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Ni–Co Bimetallic Hydroxide Nanosheet Arrays Anchored on Graphene for Adsorption-Induced Enhanced Photocatalytic CO2 Reduction

Mengmeng Wang, Dongyun Chen^*（陈冬赟）, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, and Jianmei Lu^*（路建美）

Collaborative Innovation Center of Suzhou Nano Science and TechnologyCollege of Chemistry Chemical Engineering and Materials Science Soochow University199 Ren’ai Road, Suzhou 215123, P.R. China

Adv.Mater. 2022, 2202960

Photocatalytic CO2 reduction can be implemented to use CO2, a greenhouse gas, as a resource in an energy-saving and environmentally friendly way, in which suitable catalytic materials are required to achieve high-efficiency catalysis. Insufficient accessible active sites on the catalyst surface and inhib-ited electron transfer severely limit the photocatalytic performance. There-fore, porous aerogels are constructed from composites comprising different ratios of Ni–Co bimetallic hydroxide (NixCoy) grown on reduced graphene oxide (GR) into a hierarchical nanosheet-array structure using a facile in situ growth method. Detailed characterization shows that this structure exposes numerous active sites for enhanced adsorption-induced photocatalytic CO2 reduction. Moreover, under the synergistic effect of Ni–Co bimetallic hydroxide, the CO2 adsorption capacity as well as charge-carrier separa-tion and transfer are excellent. As a result, the Ni7Co3–GR catalyst exhibits highly improved catalytic performance when compared with recently reported values, with a high CO release rate of 941.5 μmol h−1 g−1 and a selectivity of 96.3% during the photocatalytic reduction of CO2. This work demonstrates a new strategy for designing nanocomposites with abundant active sites structures.