Co-N Decorated Hierarchically Porous Graphene Aerogel for Efficient Oxygen Reduction Reaction in Acid

Xiaogang Fu, Ja Yeon Choi, Pouyan Zamani, Gaopeng Jiang, Md Ariful Hoque, Fathy Mohamed Hassan, Zhongwei Chen

Research output: Contribution to journalArticlepeer-review

139 Citations (Scopus)

Abstract

Nitrogen-functionalized graphene materials have been demonstrated as promising electrocatalyst for the oxygen reduction reaction (ORR), owning to their respectable activity and excellent stability in alkaline electrolyte. However, they exhibit unacceptable catalytic activity in acid medium. Here, a hierarchically porous Co-N functionalized graphene aerogel is prepared as an efficient catalyst for the ORR in acid electrolyte. In the preparation process, polyaniline (PANI) is introduced as a pore-forming agent to aid in the self-assembly of graphene species into a porous aerogel networks, and a nitrogen precursor to induce in situ nitrogen doping. Therefore, a Co-N decorated graphene aerogel framework with a large surface area (485 m2 g-1) and an abundance of meso/macropores is effectively formed after heat treatment. Such highly desired structures can not only expose sufficient active sites for the ORR but also guarantee the fast mass transfer in the catalytic process, which provides significant catalytic activity with positive onset and half wave potentials, low hydrogen peroxide yield, high resistance to methanol crossover, and remarkable stability that is comparable to commercial Pt/C in acid medium.

Original languageEnglish
Pages (from-to)6488-6495
Number of pages8
JournalACS Applied Materials and Interfaces
Volume8
Issue number10
DOIs
Publication statusPublished - Mar 16 2016
Externally publishedYes

Keywords

  • cobalt-nitrogen moieties
  • fuel cell
  • graphene aerogel
  • hierarchically porous structures
  • oxygen reduction reaction

ASJC Scopus subject areas

  • Materials Science(all)

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