Broad temperature adaptability of vanadium redox flow battery-part 4: Unraveling wide temperature promotion mechanism of bismuth for V2+/V3+ couple

• 来源期刊: 能源化学
• 年，卷（期）: 2018,（5）
• 页码范围: 1333-1340
• 页数: 8页
• 语种: 英文

摘要

Vanadium flow battery (VFB) is a fast going and promising system for large-scale stationary energy storage,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 400mA cm-2,as well as a long-term stability over 600 charging/discharging cycles at a high current 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 ℃.