Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7990234 | Journal of Alloys and Compounds | 2018 | 28 Pages |
Abstract
The discovery and design of new negative electrodes play an essential role in the development of high-performance asymmetric supercapacitors (ASCs). In this work, we report a sulfidation of NiFe-layered double hydroxides (NiFe-LDHS) fabricated through vulcanizing NiFe-LDH via a hydrothermal method, with enhanced electrochemical performance serving as a negative electrode for ASCs. The sulfidation treatment significantly improves the electrical conductivity and reduces the diffusion resistance of the electrode. Electrochemical tests show that the NiFe-LDHS exhibits much higher area specific capacitance (992â¯mFâ¯cmâ2 at 2â¯mAâ¯cmâ2) and better cycling stability (64.5% of the initial capacity after 2000 cycles at 4â¯mAâ¯cmâ2), compared with the pristine NiFe-LDH. ASCs which are configurated by using NiFe-LDHS as the negative electrodes and Ni(OH)2 as the positive electrodes, deliver high energy density of 39.9â¯Wh kgâ1 at a power density of 211.4â¯Wâ¯kgâ1 and remain 13.5â¯Wh kgâ1 at a high power density of 2114â¯W kgâ1.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Ting Xiao, Shulin Wang, Jin Li, Na Yang, Wei Li, Peng Xiang, Lihua Jiang, Xinyu Tan,