Co@Co3O4 @PPD Core@bishell Nanoparticle-Based Composite as an Efficient Electrocatalyst for Oxygen Reduction Reaction

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Zhijuan Wang
  • Bing Li
  • Xiaoming Ge
  • F. W. Thomas Goh
  • Xiao Zhang
  • Guojun Du
  • Delvin Wuu
  • Zhaolin Liu
  • T. S. Andy Hor
  • Yun Zong

Detail(s)

Original languageEnglish
Pages (from-to)2580-2587
Journal / PublicationSmall
Volume12
Issue number19
Online published31 Mar 2016
Publication statusPublished - 18 May 2016
Externally publishedYes

Abstract

Durable electrocatalysts with high catalytic activity toward oxygen reduction reaction (ORR) are crucial to high-performance primary zinc-air batteries (ZnABs) and direct methanol fuel cells (DMFCs). An efficient composite electrocatalyst, Co@Co3O4 core@shell nanoparticles (NPs) embedded in pyrolyzed polydopamine (PPD) is reported, i.e., in Co@Co3O4 @PPD core@bishell structure, obtained via a three-step sequential process involving hydrothermal synthesis, high temperature calcination under nitrogen atmosphere, and gentle heating in air. With Co@Co3O4 NPs encapsulated by ultrathin highly graphitized N-doped carbon, the catalyst exhibits excellent stability in aqueous alkaline solution over extended period and good tolerance to methanol crossover effect. The integration of N-doped graphitic carbon outer shell and ultrathin nanocrystalline Co3O4 inner shell enable high ORR activity of the core@bishell NPs, as evidenced by ZnABs using catalyst of Co@Co3O4 @PPD in air-cathode which delivers a stable voltage profile over 40 h at a discharge current density of as high as 20 mA cm -2 . Co@Co3O4 core@shell nanoparticles (NPs) embedded in N-doped graphitic carbon matrix of pyrolyzed polydopamine (PPD), i.e., Co@Co3O4 @PPD core@bishell structure are obtained. This material shows high oxygen reduction reaction activity. Consequently, it is used as a cathode catalyst in zinc-air batteries and delivers stable voltage profile over an extended period at a discharge current density of as high as 20 mA cm-2 .

Research Area(s)

  • cobalt oxide, dopamine, nitrogen-doped carbon, oxygen reduction reaction, zinc-air batteries

Citation Format(s)

Co@Co3O4 @PPD Core@bishell Nanoparticle-Based Composite as an Efficient Electrocatalyst for Oxygen Reduction Reaction. / Wang, Zhijuan; Li, Bing; Ge, Xiaoming; Goh, F. W. Thomas; Zhang, Xiao; Du, Guojun; Wuu, Delvin; Liu, Zhaolin; Andy Hor, T. S.; Zhang, Hua; Zong, Yun.

In: Small, Vol. 12, No. 19, 18.05.2016, p. 2580-2587.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal