Silver-carbon nanocapsule electrocatalyst for oxygen reduction reaction

Cheng Yeou Wu*, Pu-Wei Wu, Pang Lin, Yuan Yao Li, Ying Mei Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The types of carbonaceous material and electrocatalyst are the critical components in fabrication of gas diffusion electrodes for fuel cells and metal-air batteries. In this study, carbon nanocapsule (15-30 nm) and Ag-carbon nanocapsule powders were synthesized and characterized for their electrochemical performances as oxygen reduction electrocatalyst in alkaline electrolyte using commercial noncatalyzed gas diffusion electrode as substrate. The i-V polarization response of the carbon nanocapsule demonstrated enhanced electrocatalytic capability over those of XC-72R and vapor growth carbon fiber, delivering 0.80 V at 200 mA cm2. In addition, Ag-carbon nanocapsule powders exhibited a value of 0.99 V at 200 mA cm2, surpassing commercially available Mn-catalyzed, and MnCo-catalyzed gas diffusion electrodes. Galvanostatic discharge of these Ag-carbon nanocapsule powders from 10 to 200 mA cm2 confirmed their stability and sustainability. This report identified a class of carbon material that not only exhibits electrocatalytic capability itself but also provides opportunity as substrate for known electrocatalysts.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume154
Issue number10
DOIs
StatePublished - 31 Aug 2007

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