Dual-active-sites design of CoSx anchored on nitrogen-doped carbon with tunable mesopore enables efficient Bi-Functional oxygen catalysis for ultra-stable zinc-air batteries

Cong Liu, Fang Dong, Mingjie Wu, Yongxia Wang, Nengneng Xu, Xu Wang, J. Qiao, Penghui Shi, Haitao Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

12 Citations (Scopus)

Abstract

Developing highly efficient oxygen electrode is particular important in the application of electrochemical energy conversion and storage technologies. In this work, we report the synthesis of highly dispersed CoSx nanocrystals anchored on N-doped mesoporous carbon (CoSx@NMC) network electrode. CoSx@NMC, derived from Fe/Co dual tuning nitrogen/sulfur-containing polymer as carbon precursor, manifests discrete dual-active-sites endowing excellent bifunctional catalytic activity toward both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The zinc-air battery system assembled from this CoSx@NMC electrode exhibits an open circuit voltage of 1.44V (vs. Zn/Zn+) and a peak power density of 269.7 mW cm−2. Notably, it exhibits a super stability in the galvanostatic discharge of 5 mA and 50 mA, and the voltage could be maintained stable at 1.25V over 90h galvanostatic discharge. Rechargeable zinc-air battery delivers an excellent cycling stability beyond 1288 charge/discharge cycles. The superior electrochemical catalytic properties for ORR/OER are attributed to the strongly coupled pyridine-N, graphitic-N and nanoscale CoSx, which can promote the simultaneous exposure of both OER and ORR active centres. Further investigations reveal that the microstructure of the mesoporous carbon might experience a structural remodeling during the charge/discharge process.

Original languageEnglish
Article number226953
JournalJournal of Power Sources
Volume438
DOIs
Publication statusPublished - 31 Oct 2019

Keywords

  • Dual-active-sites
  • Fe/co dual tuning
  • Oxygen evolution
  • Oxygen reduction
  • Porous carbon
  • Zn-air battery

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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