Abstract
The global issue of plastic pollution and carbon emission have significantly impacted the survival of both ecosystems and human beings. Electrochemical coupling of polyethylene terephthalate plastic (PET) and CO2 into fine chemicals provides a potential approach to achieve waste resource utilization and carbon neutrality. Herein, we reported an innovative electrocatalytic system for concurrently upgrading PET hydrolysate and CO2 into value-added formic acid. Through a sulfide-and-reconstruct strategy, Ni3Bi2S2 and Bi2S3 were synthesized as pre-catalysts, which can undergo in situ reconstruction to form NiOOH/Ni3Bi2S2 at the anode and Bi (1.5 S) at the cathode during electrolysis. The exceptional electrocatalytic performance (96 % and 97 % at the anode and cathode, respectively) and stabilities (>30 h) of the anodic NiOOH/Ni3Bi2S2 and cathodic Bi (1.5 S) was attributed to the exposure of the true active site after reconstruction. By coupling PET hydrolysate oxidation reaction (POR) with CO2 reduction reaction (CO2RR), the assembled zero-gap MEA electrolyzer realized a total Faradaic efficiency of 175 % for formate. This study provided a concept for upcycling of PET.
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