Broad temperature adaptability of vanadium redox flow battery-part4:Unraveling wide temperature promotion mechanism of bismuth for V^(2+)/V^(3+) couple  

作　　者：Yuchen Liu Feng Liang Yang Zhao Lihong Yu Le Liu Jingyu Xi 

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology [2]Institute of Green Chemistry and Energy, Graduate School at Shenzhen, Tsinghua University [3]School of Applied Chemistry and Biological Technology, Shenzhen Polytechnic

出　　处：《Journal of Energy Chemistry》2018年第5期1333-1340,共8页能源化学（英文版）

基　　金：financial support from the National Natural Science Foundation of China (No. 21576154);the Open Fund of The State Key Laboratory of Refractories and Metallurgy (No. G201809);the Shenzhen Basic Research Project (Nos. JCYJ20170412170756603 and JCYJ20170307152754218)

摘　　要：Vanadium flow battery （VFB） is a fast going and promising system for large-scale stationary energy stor- age. However, drawbacks such as low power density and narrow temperature window caused by poor catalytic activity of graphite felt （GF） electrodes limit its worldwide application. In this paper, bismuth, as a low-cost, no-toxic and high-activity electrocatalyst, is used to modify the thermal activated GF （TGF） via a facile hydrothermal method. Bismuth can effectively inhibit the side reaction of hydrogen evolution in wide temperature range, while promoting the V2＋/V3＋ redox reaction. As a result, the VFB assembled with Bi/TGF as negative electrode demonstrates outstanding rate performance under the current density up to 400 mAcm-2, as well as a long-term stability over 600 charging/discharging cycles at a high cur- rent density of 150mA cm-2. Moreover, it also shows excellent temperature adaptability from -10 ℃ to 50 ℃ and high durability for life test at the temperature of 50 ℃.Vanadium flow battery （VFB） is a fast going and promising system for large-scale stationary energy stor- age. However, drawbacks such as low power density and narrow temperature window caused by poor catalytic activity of graphite felt （GF） electrodes limit its worldwide application. In this paper, bismuth, as a low-cost, no-toxic and high-activity electrocatalyst, is used to modify the thermal activated GF （TGF） via a facile hydrothermal method. Bismuth can effectively inhibit the side reaction of hydrogen evolution in wide temperature range, while promoting the V2＋/V3＋ redox reaction. As a result, the VFB assembled with Bi/TGF as negative electrode demonstrates outstanding rate performance under the current density up to 400 mAcm-2, as well as a long-term stability over 600 charging/discharging cycles at a high cur- rent density of 150mA cm-2. Moreover, it also shows excellent temperature adaptability from -10 ℃ to 50 ℃ and high durability for life test at the temperature of 50 ℃.

关 键 词：Vanadium flow battery Graphite felt electrode BISMUTH Hydrogen evolution reaction Wide temperature 

分 类 号：TM912[电气工程—电力电子与电力传动]