文献类型：期刊文献

英文题名：Aqueous Al-Ion Supercapacitor with V2O5 Mesoporous Carbon Electrodes

作者：Tian, Meng[1,2];Li, Ruihan[1];Liu, Chaofeng[2];Long, Donghui[1,3];Cao, Guozhong[2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA;[3]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：11

期号：17

起止页码：15573

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20191906897253);WOS:【SCI-EXPANDED(收录号:WOS:000466988800041)】；

基金：This work was partly supported by MOST (Grant 2014CB239702), the National Science Foundation of China (Grant No. 21576090), and Fundamental Research Funds for the Central Universities (Grant 222201718002).

语种：英文

外文关键词：Al-ion capacitors; vanadium pentoxide; pseudo capacitance; mesoporous carbon; symmetric capacitors

摘要：A high-performance, low-cost, aqueous Al-ion supercapacitor was fabricated based on nanostructured V2O5 impregnated mesoporous carbon microspheres (MCM/V2O5) electrodes and Al-2(SO4)(3) electrolyte for efficient energy storage. MCM/V2O5 composites exhibit high dispersion of nanostructured V2O5 in a mesoporous carbon matrix, beneficial to fast reversible redox reactions with a short diffusion path. The corresponding capacitor illustrates the distinguishable redox behavior, most likely due to the Al3+ intercalation/deintercalation leading to the reduction/oxidation of V5+/V4+. It delivers a high-energy density of 18.0 Wh kg(-1) at 147 W kg(-1) and a long cycling lifespan with over 88% capacitance retention over 10 000 cycles. The competitive performance can be ascribed to the integration of the electric double layer capacitance provided from MCM with pseudocapacitance contributed by nanostructured V2O5. This work offers the possibilities of high-performance aqueous capacitors based on trivalent Al-ion as guest species, providing new directions for future development of supercapacitors.