Facile preparation of high-performance MnO2/KB air cathode for Zn-air batteries

M. C. Wu, T. S. Zhao, H. R. Jiang, L. Wei, Z. H. Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

23 Citations (Scopus)

Abstract

MnO2 has been demonstrated to be an effective catalyst for Zn-air batteries, but suffers from cripplingly low cell performance due to its limited electrical conductivity. In this work, we report a facile process for preparing the MnO2/C air cathode by directly anchoring the MnO2 onto Ketjen Black (KB) via an in-situ redox reaction. It is demonstrated that a Zn-air battery installed with the proposed MnO2/KB air cathode outperforms that installed with a commercial Pt/C cathode. Specifically, the MnO2/KB cathode presents a more positive ORR onset potential and a larger current density compared with that of the Pt/C cathode. Under ambient air, the prepared MnO2/KB air cathode allows the battery to reach a peak power density of 133.17 mW cm−2 when operated at a current density of 188.51 mA cm−2, which is among the highest values in the literature. More impressively, the battery installed with the proposed cathode can be operated at a high current density of up to 100 mA cm−2 with a voltage discharge plateau larger than 1.0 V. These results indicate that the MnO2/KB electrode offers a promising option for both alkaline fuel cells and metal-air batteries.

Original languageEnglish
Pages (from-to)1438-1444
Number of pages7
JournalElectrochimica Acta
Volume222
DOIs
Publication statusPublished - 20 Dec 2016
Externally publishedYes

Keywords

  • Air cathode
  • Manganese dioxide
  • Oxygen reduction reaction
  • Zn-air battery

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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