A three-dimensional Mn3O4network supported on a nitrogenated graphene electrocatalyst for efficient oxygen reduction reaction in alkaline media

SK Bikkarolla, F Yu, W Zhou, Paul Joseph, Peter Cumpson, Pagona Papakonstantinou

Research output: Contribution to journalArticle

97 Citations (Scopus)

Abstract

Developing low cost oxygen reduction catalysts that perform with high efficiency is highly desirable for the commercial success of environmentally friendly energy conversion devices such as fuel cells and metal–air batteries. In this work a three-dimensional, 3D, self-assembled Mn3O4 hierarchical network has been grown on nitrogen doped reduced graphene oxide (NrGO), by a facile and controllable electrodeposition process and its electrocatalytic performance for oxygen reduction reaction (ORR) has been assessed. The directly electrodeposited MnOx on a glassy carbon electrode (GCE) exhibits little electrocatalytic activity, whereas the integrated Mn3O4/NrGO catalyst is more ORR active than the NrGO. The resulting electrode architecture exhibits an “apparent” four-electron oxygen reduction pathway involving a dual site reduction mechanism due to the synergetic effect between Mn3O4 and NrGO. The 3D Mn3O4/NrGO hierarchical architecture exhibits improved durability and methanol tolerance, far exceeding the commercial Pt/C. The enhanced ORR performance of the room temperature electrodeposited Mn3O4 nanoflake network integrated with NrGO reported here offers a new pathway for designing advanced catalysts for energy conversion and storage.
Original languageEnglish
Pages (from-to)14493-14501
Number of pages9
JournalJournal of Materials Chemistry A
Issue number35
Early online date1 Jul 2014
DOIs
Publication statusPublished - 21 Sep 2014

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