%0 Journal Article %A Park, Minjoon %A Jung, Yang-jae %A Kim, Jungyun %A Lee, Ho il %A Cho, Jeaphil %D 2016 %T Synergistic Effect of Carbon Nanofiber/Nanotube Composite Catalyst on Carbon Felt Electrode for High-Performance All-Vanadium Redox Flow Battery %U https://acs.figshare.com/articles/journal_contribution/Synergistic_Effect_of_Carbon_Nanofiber_Nanotube_Composite_Catalyst_on_Carbon_Felt_Electrode_for_High_Performance_All_Vanadium_Redox_Flow_Battery/2368303 %R 10.1021/nl402566s.s001 %2 https://acs.figshare.com/ndownloader/files/4007755 %K vanadium redox flow battery %K electron transfer rate %K edge plane %K mA %K Carbon Felt Electrode %K surface defect sites %K energy efficiency %K electrode materials %K acetylene gas %K CF electrode %K Synergistic Effect %K discharge capacity %K Ni catalysts %K CNT %K electrocatalytic properties %K VO %K CNF %K cell exhibits %X 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+/VO2+ 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. %I ACS Publications