摘要
以NH_4VO_3为原料,通过180℃下水热反应和550℃下NH_3处理制备了多孔氮化钒(VN)纳米带气凝胶,并对多孔VN纳米带气凝胶的电化学性能进行了分析.SEM和TEM分析表明所制备的多孔VN纳米带的宽度为100~400 nm,孔尺寸为10~20 nm.电化学阻抗谱分析表明多孔VN纳米带气凝胶对I3.还原反应具有很高的催化活性,电荷迁跃电阻为1.36Ωcm^2.用多孔VN纳米带气凝胶电极组装的染料敏化太阳电池的光电转换效率为7.05%,与传统的Pt电极电池相近.循环伏安和恒流充放电实验表明多孔VN纳米带气凝胶具有较好的电容性能.当电流密度为0.5 A/g时,多孔VN纳米带气凝胶在2 mol/L KOH溶液中的比电容达到292.2 F/g.因此,所制备的多孔VN纳米带气凝胶可以作为高效的电极材料应用于染料敏化太阳电池对电极和超级电容器电极中.
Porous vanadium nitride nanoribbon aerogel （PVNNRA） was prepared by hydrothermal reaction at 180℃ and subsequent ammonia treatment at 550℃ using NH4VO3 as the precursor. The electrochemical properties of PVNNRA were discussed. SEM and TEM images demonstrated that as-prepared vanadium nitride showed a porous nanoribbon morphology with the width of 100-400 nm and the pore size of 10-20 nm. The analysis of electrochemical impedance spectroscopy indicated that the charge-transfer resistance of PVNNRA electrode was 1.36 Ω cm2, indicating a high electrocatalytic activity for I3- reduction. The dye-sensitized solar cell fabricated with PVNNRA counter electrode achieved a conversion efficiency of 7.05%, which is closed to that of the cell fabricated with Pt counter electrode. The results of cyclic voltammetry and galvanostatic charge/discharge tests demonstrated that PVNNRA has a good capacitive performance. At the current density of 0.5 A/g, PVNNRA exhibited a specific capacitance of 292.2 F/g in 2 mol/L KOH aqueous solution. Therefore, as-prepared PVNNRA can be considered as an effective electrode material for application in dye-sensitized solar cells and supercapacitors
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2017年第5期559-564,共6页
Scientia Sinica(Technologica)
基金
国家自然科学基金(批准号:21273137)
辽宁省自然科学基金(批准号:201601011)资助项目
关键词
多孔氮化钒纳米带
气凝胶
电极材料
porous vanadium nitride nanoribbon, aerogel, electrode materials
作者简介
E—mail：wgqiang@bhu．edu．cn
