Bifunctional Electrocatalytic Activity of Boron-Doped Graphene Derived from Boron Carbide

Thazhe Veettil Vineesh, M. Praveen Kumar, Chisato Takahashi, Golap Kalita, Subbiah Alwarappan, Deepak K. Pattanayak, Tharangattu N. Narayanan

Research output: Contribution to journalArticlepeer-review

143 Scopus citations

Abstract

A single material that can perform water oxidation and oxygen reduction reactions (ORR), also called bifunctional catalyst, represents a novel concept that emerged from recent materials research and that has led to applications in new-generation energy-storage systems, such as regenerative fuel cells. Here, metal/metal-oxide free, doped graphene derived from rhombohedral boron carbide (B4C) is demonstrated to be an effective bifunctional catalyst for the first time. B4C, one of the hardest materials in nature next to diamond and cubic boron nitride, is converted and separated in bulk to form heteroatom (boron, B) doped graphene (BG, yield ≈7% by weight, after the first cycle). This structural conversion of B4C to graphene is accompanied by in situ boron doping and results in the formation of an electrochemically active material from a non-electrochemically active material, broadening its potential for application in various energy-related technologies. The electrocatalytic efficacy of BG is studied using various voltammetric techniques. The results show a four-electron transfer mechanism as well as a high methanol tolerance and stability towards ORR. The results are comparable to those from commercial 20 wt% Pt/C in terms of performance. Furthermore, the bifunctionality of the BG is also demonstrated by its performance in water oxidation.

Original languageEnglish
Article number1500658
JournalAdvanced Energy Materials
Volume5
Issue number17
DOIs
StatePublished - 1 Sep 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords

  • bifunctional catalysts
  • doped graphene
  • electrocatalysis
  • oxygen reduction reaction
  • regenerative fuel cells

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