Freestanding MoO3-x nanobelt/carbon nanotube films for Li-ion intercalation pseudocapacitors

被引：149
作者：
Xiao, Xu [1 ]
Peng, Zehua [1 ]
Chen, Chi [1 ]
Zhang, Chuanfang [2 ]
Beidaghi, Majid [2 ]
Yang, Zhenhua [3 ]
Wu, Nan [1 ]
Huang, Yunhui [4 ]
Miao, Ling [1 ]
Gogotsi, Yury [2 ]
Zhou, Jun [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China
[2] Drexel Univ, AJ Drexel Nanotechnol Inst, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA
[3] Xiangtan Univ, Minist Educ, Key Lab Low Dimens Mat Applicat Technol, Fac Mat Optoelect & Phys, Xiangtan 411105, Peoples R China
[4] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, Wuhan 430074, Peoples R China
来源：
NANO ENERGY | 2014年 / 9卷
基金：
中国国家自然科学基金;
关键词：
MoO3; nanobelts; Pseudocapacitor; Intercalation; Freestanding; Hydrogenated; ELECTROCHEMICAL ENERGY-STORAGE; SELF-POWERED SYSTEMS; ASYMMETRIC SUPERCAPACITORS; HIGH-PERFORMANCE; FLEXIBLE SUPERCAPACITORS; VOLUMETRIC CAPACITANCE; CARBON; ELECTRODES; GRAPHENE; PAPER;
D O I：
10.1016/j.nanoen.2014.08.001
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Molybdenum trioxide (MoO3) is known as a promising pseudocapacitive material, but low conductivity limits its applications. Hydrogenation is demonstrated to increase the conductivity of MoO3 and hence improve its electrochemical performance. Hydrogenated MoO3 (MoO3-x) shows enhanced conductivity based on, both first principle calculations and single nanobelt measurements. Freestanding MoO3-x/carbon nanotubes (CNT) composite films have been fabricated and showed much improved electrochemical performance compared to composites of CNT and as-synthesized MoO3 (MoO3/CNT). Electrodes showed a specific capacitance of 337 F/g (based on the mass of MoO3-x) and a high volumetric capacitance of 291 F/cm(3) (based on the whole electrode) with excellent rate capability. Also we confirmed that the improved intercalation kinetics and the increased intercalation pseudocapacitance could be attributed to the higher electronic conductivity of MoO3-x, which results in better and faster intercalations of Li+ ions. This electrochemical behavior implies that MoO3-x can serve as a very good negative electrode with high capacitance at high mass loading levels. (C) 2014 Elsevier Ltd. All rights reserved.
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页码：355 / 363
页数：9
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