Upcycling Expired Bismuth‐Drugs as Low‐Cost Practical Precatalysts for Sustainable Multi‐Scenario Formate Electrosynthesis

ABSTRACT The pressing challenges of resource shortage and environmental issue demand innovative technologies that matching circular economies. Here, we proposed an integrated strategy that enables direct waste reuse and sustainable electrosynthesis by converting expired bismuth (Bi)‐drugs into impressive precatalysts, achieving the efficient electro‐upcycling of carbon dioxide to formate in a universal electrolyzer with a stabilized Faradaic efficiency exceeding 90%. Systematically, we evaluated a range of expired Bi‐drugs without any pretreatment, confirming consistently superior catalytic performance comparable to the benchmark in a flow cell system. This finding provides crucial experimental evidence for the feasibility of nonsorted direct utilization of expired Bi‐drugs. Furthermore, to broaden the scope toward practical application, we also assessed the impact of water quality and the feasibility of tandem electro‐chemo synthesis by employing the formate‐containing electrolyte, which, for instance, allowed for the value‐added synthesis of benzimidazole in a yield of 85%. This work establishes a scalable sustainable paradigm for interdisciplinary, integrating waste upcycling, energy‐efficient synthesis, and up–downstream resource optimization.