摘要
对于储能系统,同时实现高能量密度和高功率密度仍是一个巨大的挑战.电化学超级电容器通过表面吸附或表面氧化还原反应实现储能,是解决上述问题的潜在方法之一.本论文报道了一种新型高氮掺杂(9.29 at.%)黑色二氧化钛(TiO2-x:N)超级电容器电极材料.该材料具有独特的微观结构,由高导电的非晶壳层和一个纳米晶核组成.在酸性电解液中,该材料可以通过氮参与的氧化还原反应(TiO2-xNy+z H++ze■-TiO2-xNyHz)可逆地与质子结合实现能量的高效快速储存,实现极高的比电容(2 mV s-1扫速下容量高达750 F g-1,1 A g-1电流密度下容量可达707 F g-1)、高倍率特性(极高电流密度20 A g-1时容量仍可达503 F g-1)和长时间循环下的高稳定性.作为一种新型超级电容器电极材料,氮掺杂黑色二氧化钛或将引领金属氧化物型超级电容器的复兴.
For energy storage system,it is still a huge challenge to achieve high energy density and high power density simultaneously.One potential solution is to fabricate electrochemical capacitors(ECs),which store electric energy through surface ion adsorption or redox reactions.Here we report a new electrode material,heavy nitrogen-doped(9.29 at.%)black titania(TiO2-x:N).This unique hybrid material,consisting of conductive amorphous shells supported on nanocrystalline cores,has rapid N-mediated redox reaction(TiO2-xNy+zH++ze■-TiO2-xNyHz),especially in acidic solutions,providing a specific capacitance of 750 Fg-1at 2 m V s-1(707 Fg-1at 1 A g-1),great rate capability(503 F g-1at 20 Ag-1),and maintain stable after initial fading.Being a new developed supercapacitor material,nitrogen-doped black titania may revive the oxide-based supercapacitors.
作者
杨重寅
王鑫
董武杰
陈一苇
汪宙
徐吉健
林天全
顾辉
黄富强
Chongyin Yang;Xin Wang;Wujie Dong;I-Wei Chen;Zhou Wang;Jijian Xu;Tianquan Lin;Hui Gu;Fuqiang Huang(State Key Laboratory of High Performance Ceramics and Superfine Microstructures,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;Department of Materials Science and Engineering,University of Pennsylvania,Pennsylvania,PA 19104-6272,USA;State Key Laboratory of Rare Earth Materials Chemistry and Applications and National Laboratory,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China;College of Chemistry and Molecular Engineering,Zhengzhou University,Zhengzhou 450001,China)
基金
financially supported by the National key R&D Program of China(2016YFB0901600)
the Key Research Program of Chinese Academy of Sciences(QYZDJ-SSWJSC013)Chen IW was supported by U.S.Department of Energy BES grant DE-FG02-11ER46814
used the facilities(Laboratory for Research on the Structure of Matter)supported by NSF grant DMR-1120901。
