Silver-Copper Nanoalloy Catalyst Layer for Bifunctional Air Electrodes in Alkaline Media

Xiaoqiang Wu, Fuyi Chen*, Yachao Jin, Nan Zhang, Roy L. Johnston

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)
295 Downloads (Pure)


A carbon-free and binder-free catalyst layer composed of a Ag-Cu nanoalloy on Ni foam was used as the air cathode in a zinc-air battery for the first time. The Ag-Cu catalyst was prepared using pulsed laser deposition. The structures of the catalysts were found to consist of crystalline Ag-Cu nanoalloy particles with an average size of 2.58 nm embedded in amorphous Cu films. As observed in the X-ray photoelectron spectra, the Ag 3d core levels shifted to higher binding energies, whereas the Cu 2p core levels shifted to lower binding energies, indicating alloying of the silver and copper. Rotating disk electrode measurements indicated that the oxygen reduction reaction (ORR) proceeded through a four-electron pathway on the Ag50Cu50 and Ag90Cu10 nanoalloy catalysts in alkaline solution. Moreover, the catalytic activity of Ag50Cu50 in the ORR is more efficient than that of Ag90Cu10. By performing charge and discharge cycling measurements, the Ag50Cu50 catalyst layer was confirmed to have a maximum power density of approximately 86.3 mW cm-2 and an acceptable cell voltage at 0.863 V for current densities up to 100 mA cm-2 in primary zinc-air batteries. In addition, a round-trip efficiency of approximately 50% at a current density of 20 mA cm-2 was also obtained in the test.

Original languageEnglish
Pages (from-to)17782-17791
Number of pages10
JournalACS Applied Materials & Interfaces
Issue number32
Early online date22 Jul 2015
Publication statusPublished - 19 Aug 2015


  • nanoalloy
  • oxygen reduction reaction
  • primary zinc-air battery
  • pulsed laser deposition
  • rechargeable zinc-air battery

ASJC Scopus subject areas

  • General Materials Science


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