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Exploring reversible Zn–CO 2 batteries holds great promising potential for future CO 2 fixation and energy supply. Herein, the bifunctional PdBi alloy anchoring on carbon substrate (BiPdC) is proposed for simultaneously catalyzing carbon dioxide reduction reaction (CO 2 RR) and formic acid oxidation (FAO). The synergistic effect between Pd and Bi overcomes the sluggish kinetics of CO 2 RR and FAO, causing the HCOOH Faraday efficiency (FE HCOOH ) of 63.4% and 6.2 mA cm –2 current density for FAO. Benefiting from the CO 2 –HCOOH interconversion, the homemade reversible Zn–CO 2 battery exhibits the optimal 52.6% FE HCOOH and 1.1 V voltage gap within 45 h of cycling.
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Gao et al. (2022) studied this question.
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