Hydrothermal synthesis of 3D NixCo1?xS2 particles/graphene composite hydrogels for high performance supercapacitors |
| |
| Affiliation: | 1. College of Metallurgic Engineering, Hunan University of Technology, Zhuzhou, 412007, China;2. State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, China;1. School of Chemistry and Chemical Engineering, Anhui Key Lab of Coal Clean Conversion and Utilization, Anhui University of Technology, Maanshan 243002, China;2. School of Chemical Engineering, Liaoning Key Lab for Materials Science and Chemical Engineering, Dalian University of Technology, Dalian 116024, China;3. School of Chemical Engineering and Technology, Xi''an Jiaotong University, Xi''an 710049, China;1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;2. College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China |
| |
| Abstract: | In this work, three dimensional (3D) NixCo1?xS2/graphene composite hydrogels with different Ni contents (denoted as NixCo1?xS2/GH (x = 0, 0.31, 0.56, 0.66, 1)) have been synthesized by a simple one-step hydrothermal method and utilized as the active materials of supercapacitors. The as-prepared samples present a 3D interconnected porous network with the pore sizes in the range of several to tens micrometers. Interestingly, the NixCo1?xS2 particles are uniformly located on the graphene network and the particle size is evolved from ～50 nm to ～1.5 μm with the increase of Ni content. The electrochemical measurements revealed that the specific capacitance, rate capability and cyclability of different NixCo1?xS2/GH electrodes are strongly affected by their different Ni content. Among these, the 3D Ni0.31Co0.69S2/GH composite has the highest specific capacitance of 1166 F/g at a current density of 1 A/g. Furthermore, a specific capacitance of 559 F/g can be still maintained at high current density of 20 A/g. After 1000 charge–discharge cycles at 5 A/g, the specific capacitance remains a high value of 755 F/g. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
