石墨毡原位生长TiN纳米棒及其作为钒电池电极的电化学性能研究

Construction and Electrochemical Performance of TiN/Graphite Felt Nanorods Electrode for Vanadium Redox Flow Battery

利用水热合成和高温退火方法,将氮化钛纳米棒原位生长在石墨毡表面,成功构建了兼具高催化活性和高导电性的碳纤维复合电极材料。用扫描电子显微镜对复合电极的表面形貌和结构进行了表征。利用接触角测试仪对电极表面的浸润性进行了考察。采用三电极体系并通过小幅电位阶跃法和循环伏安法对电极的电化学表面积和电化学性能进行了分析。最后,通过充放电测试对相应电池性能进行了考察。结果表明,以该复合材料为电极的电池在电流密度为200 mA/cm^(2)下,能量效率达到了80.23%,比常规电池提升了约7.2%,且电池表现出更优的倍率性能和能量密度。

Using hydrothermal synthesis and high-temperature annealing methods,TiN nanorods were grown in situ on the surface of graphite felt,and a carbon fiber composite electrode material with high catalytic activity and high conductivity was successfully constructed.The surface morphology and structure of the composite electrode were characterized by scanning electron microscope.The wettability of the electrode was investigated by contact angle test.The real electrochemical surface area and electrochemical performance of the prepared electrode were analyzed by small potential step method and cyclic voltammetry respectively in a common three-electrode system.Finally,the performance of the corresponding battery was investigated through charging and discharging tests.The results show that the battery using the composite material as the electrode has an energy efficiency of 80.23%at a current density of 200 mA/cm^(2),which is about 7.2% higher than the conventional battery.Moreover,the battery exhibits better rate performance and energy density.