Graphitic-N-rich N-doped graphene as a high performance catalyst for oxygen reduction reaction in alkaline solution

摘要

As a front runner to substitute for Pt as oxygen reduction reaction (ORR) catalysts, the N species in N- doped carbon materials have an important effect on their ORR activity. Herein, we report a nitrogen-doped graphene sheets (NrGO) rich in graphitic-N prepared through a thermal pyrolysis process of a mixture of polyaniline and graphene oxide. The electrochemical result of this novel graphitic N-rich NrGO exhibits excellent catalytic performance for oxygen reduction reaction with onset potential of 0.99 V and half-wave potential of 0.84 V. The transferred electron number of the oxygen reduction reaction process is 3.92, indicating a typical 4 electron path. This new NrGO sheet catalyst also exhibits outstanding durability and methanol resistance superior to Pt/C. This paper can provide a basis for the research of the effect of nitrogen species on their ORR catalytic activity in N- doped carbon materials. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.