电化学氧还原反应合成H_(2)O_(2)碳基催化剂研究进展

Recent progress on carbon-based catalysts for electrochemical synthesis of H_(2)O_(2) via oxygen reduction reaction

电化学氧还原反应(ORR)合成H_(2)O_(2)是一种低成本、无污染的绿色合成方法。但是,ORR动力学缓慢,存在四电子ORR生成H2O的竞争反应,因此需要使用催化剂提升ORR的反应活性以及二电子ORR的选择性。近年来,碳基材料因价格便宜、来源广泛、调控方法多样,被广泛应用于该领域。本文首先简要介绍了电催化ORR合成H_(2)O_(2)的机理,并根据机理分析了影响电化学合成H_(2)O_(2)催化性能的关键因素。接着阐述了提升碳基ORR催化剂活性与二电子选择性的策略,并着重介绍了非金属原子掺杂碳材料和过渡金属氮碳材料。最后,总结了碳基催化剂在电化学合成H_(2)O_(2)中存在的问题和面临的挑战,对碳基催化剂在电合成H_(2)O_(2)中应用的发展趋势进行了展望。

The electrochemical synthesis of H_(2)O_(2) via oxygen reduction reaction(ORR)is a low-cost,environment-friendly,and green synthesis method.However,the kinetics of ORR is very slow,and is also accompanied by the competitive reaction of 4 electron(4e-)ORR to generate H2O.The catalysts are therefore required.In recent years,carbon-based materials with low prices,abundant resources,competitive activity,and easy adjustability,have received extensive attention in this field.Herein,this review first briefly introduces the mechanism of ORR to the synthesis of H_(2)O_(2),and the key factors of the catalytic performance of electrochemical synthesis of H_(2)O_(2).Further,the strategy to improve the ORR activity and selectivity of carbon-based catalysts is reviewed,in which the doping of non-metallic atoms and the construction of transition metal single atoms on carbon-based materials are emphasized.Finally,the existing problems,challenges,and perspectives of carbon-based catalysts toward the electrosynthesis of H_(2)O_(2) were described.