Onion-like carbon as dopant/modification-free electrocatalyst for [VO]2+/[VO2]+ redox reaction: Performance-control mechanism. (February 2018)

• Record Type: Journal Article
• Authors: Ko, Young-Jin; Choi, Keunsu; Kim, Jun-Yong; Kim, Inho; Jeong, Doo Seok; Choi, Heon-Jin; Mizuseki, Hiroshi; Lee, Wook-Seong
• Is Part Of: Carbon. Volume 127(2018)
• Page Start: 31
• Page End: 40
• Publication Date: 2018-02
• Subjects: Onion-like carbon -- Vacancy generation -- Inherent tensile strain -- Vanadium redox reaction -- First-principles calculation; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2017.10.073
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: We investigate the application of the onion-like carbon (OLC) as an electrocatalyst for [VO] 2+ /[VO2 ] + 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. Graphical abstract: Image 1