Onion-like carbon as dopant/modification-free electrocatalyst for [VO] 2+ /[VO 2 ] + redox reaction: Performance-control mechanism

Young Jin Ko, Keunsu Choi, Jun Yong Kim, Inho Kim, Doo Seok Jeong, Heon-Jin Choi, Hiroshi Mizuseki, Wook Seong Lee

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Abstract

We investigate the application of the onion-like carbon (OLC) as an electrocatalyst for [VO] 2+ /[VO 2 ] + redox flow reaction; its performance (electrocatalytic activity and reversibility) strongly increases with the synthesis to peak at 1800 °C in 1000–2000 °C range. The dopant/modification-free, optimized redox performances of the OLC is comparable to some of the best data in the literature of various types of carbon materials with post-synthesis modifications or doping. Mechanism behind such performance optimization is investigated employing various physical/electrochemical analyses as well as the first-principles calculations. We demonstrate that the carbon dangling bonds or the crystalline defects, generated by an inherent mechanism unique to the OLC, played a pivotal role in determining the electrocatalytic performances.

Original languageEnglish
Pages (from-to)31-40
Number of pages10
JournalCarbon
Volume127
DOIs
Publication statusPublished - 2018 Feb 1

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

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