Synergistic effect of carbon nanofiber/nanotube composite catalyst on carbon felt electrode for high-performance all-vanadium redox flow battery
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- Synergistic effect of carbon nanofiber/nanotube composite catalyst on carbon felt electrode for high-performance all-vanadium redox flow battery
- Park, Minjoon; Jung, Yang-Jae; Kim, Jungyun; Lee, Ho Il; Cho, Jaephil
- carbon nanofiber; carbon nanotube; catalyst; electrode; Energy storage; redox flow battery
- Issue Date
- AMER CHEMICAL SOC
- NANO LETTERS, v.13, no.10, pp.4833 - 4839
- Carbon nanofiber/nanotube (CNF/CNT) composite catalysts grown on carbon felt (CF), prepared from a simple way involving the thermal decomposition of acetylene gas over Ni catalysts, are studied as electrode materials in a vanadium redox flow battery. The electrode with the composite catalyst prepared at 700 C (denoted as CNF/CNT-700) demonstrates the best electrocatalytic properties toward the V2+/V3+ and VO2+/VO 2 + redox couples among the samples prepared at 500, 600, 700, and 800 C. Moreover, this composite electrode in the full cell exhibits substantially improved discharge capacity and energy efficiency by ∼64% and by ∼25% at 40 mA·cm-2 and 100 mA·cm-2, respectively, compared to untreated CF electrode. This outstanding performance is due to the enhanced surface defect sites of exposed edge plane in CNF and a fast electron transfer rate of in-plane side wall of the CNT.
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