Insight into the origin of the positive effects of imidazolium salt on electrocatalytic activity: ionic carbon nanotubes as metal-free electrocatalysts for oxygen reduction reaction

Youn Soo Kim, Ju Yeon Shin, Hyun Ji Jeon, Areum Cha, Chongmok Lee, Sang-gi Lee
Chemistry, An Asian Journal 2013, 8 (1): 232-7
We report remarkable metal-free electrocatalytic activities of the imidazolium salt-functionalized ionic multi-walled carbon nanotubes (IM-f-MWCNTs) in the oxygen reduction reaction (ORR). The electrocatalytic activity can be attributed to the induced polarization of the π-electrons of CNTs, thus accelerating interfacial electron transfer. The zwitterionic MWCNTs functionalized with poly(vinylimidazolium sulfonate) have a more positive surface charge and exhibit a better electrocatalytic activity than the poly(vinylbutylimidazolium chloride)-functionalized MWCNTs. The IM-f-MWCNTs showed better fuel selectivity than the commercial Pt/C electrocatalyst.

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