Affiliation:
1. State Key Laboratory of Molecular & Process Engineering, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering East China Normal University Dongchuan Road 500 Shanghai 200241 China
Abstract
AbstractFine regulation of the physicochemical structure of carbon‐based electrocatalysts to optimize the adsorption energies of oxygen intermediates is critically important to enhance the reaction kinetics of the oxygen evolution/reduction reaction (OER/ORR) but remains a huge challenge. Herein, nano‐space confined growth of Co9S8 nanoparticles (NPs) in porous carbon is realized through an in situ confined growth strategy by using thiol‐chains functionalized COF (COF‐S‐SH) as a confined template. COF‐S‐SH is used as binding sites to immobilize Co ions to improve the interaction between metal nanoparticles (NPs) and carbon skeletons, and simultaneously serves as a confined void to avoid the aggregation metal NPs. Impressively, as an efficient bifunctional catalyst, the resulting Co9S8/COF‐S800 shows significantly enhanced oxygen electrocatalysis with a small OER‐ORR voltage gap of 0.76 V, vastly superior to that of pristine COF‐S800. Furthermore, the assembled Zn–air battery with Co9S8/COF‐S800 catalyst displays a high peak power density of 181.5 mW cm−2 and great durability over 60 h charge–discharge cycles.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Subject
General Environmental Science,Renewable Energy, Sustainability and the Environment