Evolution of silver to a better electrocatalyst: Water-assisted oxygen reduction reaction at silver chloride nanowires in alkaline solution

Su jin Kim, Seung Cheol Lee, Chongmok Lee, Myung Hwa Kim, Youngmi Lee

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Oxygen reduction reaction (ORR) is of great interest in various areas, including energy conversion. This paper presents the simple synthesis and characterization of one-dimensional silver halides nanowires (AgClNW and AgBrNW) as an electrocatalyst for ORR in alkaline media, as well as an investigation of the ORR pathway at AgCl. AgClNW and AgBrNW were prepared via a galvanic replacement reaction (GRR) between silver nanowires (AgNW) and a halide precursor. AgClNW exhibited excellent ORR catalytic activity that was comparable to or better than that for commercial Pt (20 wt% Pt loading on Vulcan carbon), demonstrating potential to replace Pt-based catalysts. A scanning electrochemical microscopy (SECM) analysis supports the existence of an associative ORR pathway at AgCl, and first-principles density functional theory (DFT) calculations suggest that the high ORR activity of AgCl is possibly attributed to the up-shifted Ag d-band center energy in AgCl as well as the assistance of adsorbed water molecules.

Original languageEnglish
Pages (from-to)134-143
Number of pages10
JournalNano Energy
Volume48
DOIs
StatePublished - Jun 2018

Bibliographical note

Funding Information:
This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science, ICT and Future Planning ( NRF-2017R1A2A2A14001137 ) and the National Institute of Supercomputing and Network/Korea Institute of Science and Technology Information with supercomputing resources including technical support ( KSC-2014-C1–037 ).

Publisher Copyright:
© 2018 Elsevier Ltd

Keywords

  • DFT calculation
  • Electrocatalysis
  • Nanowires
  • Oxygen reduction reaction
  • Silver halide

Fingerprint

Dive into the research topics of 'Evolution of silver to a better electrocatalyst: Water-assisted oxygen reduction reaction at silver chloride nanowires in alkaline solution'. Together they form a unique fingerprint.

Cite this