State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology , Beijing 100029, China.
ACS Appl Mater Interfaces. 2017 May 17;9(19):16236-16242. doi: 10.1021/acsami.7b03375. Epub 2017 May 2.
To replace high-cost platinum group metal (PGM) electrocatalysts for oxygen reduction reaction (ORR) that is the crucial cathode reaction in fuel cell technology and metal-air battery, the development of low-cost and high-efficiency non-PGM catalysts for ORR has attracted much attention during the past decades. As one of the promising candidates, N-doped carbon is highly desirable for its strong designability and outstanding catalytic activity and stability. In this work, a facile and rational strategy is demonstrated for preparation of N,P-codoped mesoporous carbon (N,P-MC) for ORR by the direct pyrolysis treatment of polypyrrole with phytic acid as P-dopant and polystyrene sphere as template. The resultant N,P-MC exhibits a mesoporous structure with the optimized ORR active sites originating from the N,P-codoping. Owing to these features, N,P-MC exhibits excellent ORR activity, remarkable electrochemical stability, and superior methanol tolerance, comparable or even better than that of commercial Pt/C catalyst. The origin of enhanced ORR performance can be attributed to both the increased active sites and the mesoporous structure, which is expected to guide the future preparation of more capable carbon-based electrocatalysts for oxygen reduction and other electrocatalytic application.
为了取代在燃料电池技术和金属空气电池中至关重要的阴极反应——氧还原反应（ORR）中成本高昂的铂族金属（PGM）电催化剂，过去几十年来，人们一直致力于开发低成本、高效率的非 PGM ORR 催化剂。作为很有前途的候选者之一，氮掺杂碳因其较强的可设计性和出色的催化活性和稳定性而备受关注。在这项工作中，通过以植酸为 P 掺杂剂和聚苯乙烯球为模板的聚吡咯的直接热解处理，展示了一种用于 ORR 的 N、P 共掺杂介孔碳（N、P-MC）的简便且合理的制备策略。所得的 N、P-MC 具有介孔结构，其优化的 ORR 活性位点源自 N、P 共掺杂。由于这些特点，N、P-MC 表现出优异的 ORR 活性、显著的电化学稳定性和优异的甲醇耐受性，可与商业 Pt/C 催化剂相媲美，甚至更好。增强的 ORR 性能源于增加的活性位点和介孔结构，这有望为未来制备更具能力的碳基电催化剂用于氧还原和其他电催化应用提供指导。
