不同体积比混酸处理活性炭对VO^(2+)/VO_2^+活性的影响  

Impact of activated carbon treated bydifferent volume ratiosof mixed acid onall-vanadium redox flow battery

作　　者：朱雪婧[1] 陈金伟[1] 王瑞林[1] 王刚[1] 张洁[1] 刘双任 

机构地区：[1]四川大学材料科学与工程学院,四川成都610064

出　　处：《西南民族大学学报（自然科学版）》2015年第3期364-368,共5页Journal of Southwest Minzu University(Natural Science Edition)

基　　金：国家自然科学基金(21306119);四川省科技支撑计划(2013FZ0034;2013JY0150);四川大学优秀青年学者基金(2013SCU04A23)

摘　　要：采用冷凝回流的方法处理活性炭材料,讨论了硫酸与硝酸不同体积比(2:1、1:1、1:2、1:3)处理的活性炭材料对VO2+/VO2+电化学活性的影响.傅里叶变换红外测试表明,通过混酸处理,活性炭材料上只接入了羟基.比表面积仪和循环伏安分别检测了处理前后样品的表面特性及电化学性能.结果表明,VO2+/VO2+在处理后的碳材料上具有较大的活性,当硫酸与硝酸的体积比为1:2时,处理后的碳材料表现出最好的电化学性能,其ΔEp为154 m V,比未处理碳粉的ΔEp减少了3.3倍,氧化峰电流密度为28.24 m A·cm-2,提高了1.4倍,还原峰电流密度为19.73 m A·cm-2,提高了2.1倍.Using mixed acid reflux condensation method, this paper discusses the influence ,ff the activated carbon material＇ s activity for all-vanadium redox flow battery. The activated carbon is treated by sulfuric acid and nitric acid in different volume ratios （ 2：1,1 ： 1,1：2 and 1：3 ）. Fourier transform infrared spectroscopy （ FTIR ） tests showthat, only hydroxyl group has been introduced to the carbon materials. The BET surface area analyzer and cyclic voltammeter （CV） detect the surface properties and electrochemical properties. The results show that VO2＋/VO~ ~ has greater activity in the treated carbon materials, and that When the volume ratio is 1：2 ;the treated carb0n materials exhibit the best electrochemical performance. Its AEp is 154 mV,de- clining to 3.3 times that of the untreated sample, the current density of oxidation peak is 28. 24 mA ~ cm2, increasing to 1.4 times and ~thecurrent density Of reduction peak is 19. 73 mA·cm-2 ,increasing to 2. 1 times.

关 键 词：体积比 羟基 VO2+/VO2+ 冷凝回流 活性炭正极材料 

分 类 号：TM2[一般工业技术—材料科学与工程]