Sulfonated Carbon Nanotubes as Superior Catalysts towards V3+/V2+ Redox Reaction for Vanadium Redox Flow Battery
Sulfonated Carbon Nanotubes as Superior Catalysts towards V3+/V2+ Redox Reaction for Vanadium Redox Flow Battery
复制标题
磺化碳纳米管作为钒氧化还原液流电池 V3 /V2 氧化还原反应的优质催化剂
DOI：
10.1149/2.0751805jes
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发表时间：
2018
影响因子：
3.9
通讯作者：
Dai Lei
中科院分区：
文献类型：
--
作者：
He Zhangxing;Cheng Gang;Jiang Yingqiao;Wang Ling;Dai Lei
采用氯磺酸直接水热法制备了磺化碳纳米管（CNTs），并将其作为钒氧化还原液流电池中v3 +/ v2 +氧化还原反应的电催化剂。在碳纳米管表面引入的磺酸基不仅显著提高了钒电解液的可及性，而且为v3 +/ v2 +氧化还原反应提供了更多的活性位点。因此，与原始碳纳米管相比，一系列磺化碳纳米管具有更高的电化学活性和V 3+/V 2+氧化还原反应的可逆性。特别是处理10小时的磺化碳纳米管（CNTs-10）表现出最好的电催化性能。采用CNTs-10作为负极催化剂的电池在120 mA cm−2电流密度下的电压效率和能量效率分别达到68.34%和65.56%，高于原始电池的60.74%和60.50%。磺化碳纳米管对v3 +/ v2 +氧化还原反应具有优异的电催化性能，其原因在于促进了v3 +/ v2 +氧化还原反应的电化学动力学过程，加速了钒离子的传质。
Sulfonated carbon nanotubes (CNTs) was prepared by direct hydrothermal treatment in chlorosulfonic acid and employed as electrocatalysts for V 3+/V 2+ redox reaction for vanadium redox flow battery. The sulfonic groups introduced on the surface of CNTs not only significantly promote the accessibility of vanadium electrolyte, but also provide more active sites for V 3+/V 2+ redox reaction. Therefore, a series of sulfonated CNTs exhibit higher electrochemical activity and reversibility toward V 3+/V 2+ redox reaction compared with pristine CNTs. In particular, sulfonated CNTs treated for 10 hrs (CNTs-10) demonstrate the best electrocatalytic performance. The cell using CNTs-10 as negative catalysts achieves excellent charge-discharge performance with voltage efficiency and energy efficiency of 68.34% and 65.56% at a current density of 120 mA cm− 2, respectively, which are higher than those (60.74% and 60.50%) for the pristine cell. The excellent electrocatalytic performance of sulfonated CNTs toward V 3+/V 2+ redox reaction is ascribed to the promoted electrochemical kinetic process of V 3+/V 2+ redox reaction and the accelerated mass transfer of vanadium ions.