Self-standing electrodes with core-shell structures for high-performance supercapacitors
Self-standing electrodes with core-shell structures for high-performance supercapacitors
复制标题
用于高性能超级电容器的具有核壳结构的自支撑电极
DOI：
10.1016/j.ensm.2017.07.005
复制
发表时间：
2017-10-01
影响因子：
20.4
通讯作者：
Parkin, Ivan P.
中科院分区：
文献类型：
--
作者：
He, Guanjie;Ling, Min;Parkin, Ivan P.
通过气溶胶辅助化学气相沉积（AACVD）以及随后的氨退火工艺实现了具有碳布支撑的W2N@C CS层核-壳结构（W2N@CS/碳布）的超级电容器器件的制造。在三电极测试系统中，代表性电极在5 mV s（-1）下提供了693.0 mF cm（-2）的优异的面积比电容，当扫描速率增加10倍时具有类似于78%的保持率的良好速率能力，并且在20，000次循环后具有类似于91%的电容保持率的上级循环稳定性。制造用于柔性非对称超级电容器的自立式电极，并将其组装成具有离子电解质的纽扣电池，用于高工作电压应用。通过电化学分析、模拟计算和原位透射电子显微镜（TEM）研究，揭示了W2 N在酸性水溶液中性能优于WO 3-x的主要原因。这一发现为探索和设计用于超级电容器的先进金属氮化物电极材料铺平了道路。
Fabrication of supercapacitor devices with the carbon cloth supported W2N@ carbon ultrathin layer core-shell structures (W2N@C CS/carbon cloth) were realized by aerosol-assisted chemical vapour deposition (AACVD) followed by an ammonia annealing process. The representative electrodes delivered excellent areal specific capacitance of 693.0 mF cm(-2) at 5 mV s(-1) in a three electrode testing system, good rate capability of similar to 78% retention when the scan rate increased 10 times and superior cycling stability with similar to 91% capacitance retention after 20,000 cycles. The self-standing electrodes were manufactured for flexible asymmetric supercapacitors and assembled into coin cells with ionic electrolyte for high working voltage applications. The primary origins for the outperformance of W2N over WO3-x in acid aqueous electrolytes are uncovered by electrochemical analysis, simulation work and in-situ transmission electron microscope (TEM). This discovery paved the way of exploring and designing advanced metal nitride electrode materials for supercapacitors.