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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

Postal Subscription Code 80-974

2018 Impact Factor: 1.701

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Front. Mater. Sci.    2018, Vol. 12 Issue (4) : 354-360    https://doi.org/10.1007/s11706-018-0437-9
RESEARCH ARTICLE
MoS2/CoS2 composites composed of CoS2 octahedrons and MoS2 nano-flowers for supercapacitor electrode materials
Haiyan LI, Yucheng ZHAO, Chang-An WANG()
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Abstract

In pursuing excellent supercapacitor electrodes, we designed a series of MoS2/CoS2 composites consisting of flower-liked MoS2 and octahedron-shaped CoS2 through a facile one-step hydrothermal method and investigated the electrochemical performance of the samples with various hydrothermal time. Due to the coupling of two metal species and a big amount of well-developed CoS2 and MoS2, the results indicated that the MoS2/CoS2 composites electrodes exhibited the best electrochemical performance with a large specific capacitance of 490 F/g at 2 mV/s or 400 F/g at 10 A/g among all samples as the hydrothermal time reached 48 h (MCS48). Furthermore, the retention of MCS48 is 93.1% after 10000 cycles at 10 A/g, which manifests the excellent cycling stability. The outstanding electrochemical performance of MCS48 indicates that it could be a very promising and novel energy storage material for supercapacitors in the future.
Keywords MoS2/CoS2 composites      hydrothermal time      electrochemical properties      supercapacitors     
Corresponding Author(s): Chang-An WANG   
Online First Date: 20 September 2018    Issue Date: 10 December 2018
 Cite this article:   
Haiyan LI,Yucheng ZHAO,Chang-An WANG. MoS2/CoS2 composites composed of CoS2 octahedrons and MoS2 nano-flowers for supercapacitor electrode materials[J]. Front. Mater. Sci., 2018, 12(4): 354-360.
 URL:  
https://academic.hep.com.cn/foms/EN/10.1007/s11706-018-0437-9
https://academic.hep.com.cn/foms/EN/Y2018/V12/I4/354
Fig.1  (a) XRD patterns of MCS3, MCS6, MCS12, MCS24, MCS36 and MCS48. (b) Enlarged view of the XRD pattern for MCS48. (c) XPS pattern of MCS48.
Fig.2  SEM images of as-synthesized MoS2/CoS2 composites after the hydrothermal time of (a) 3 h, (b) 6 h, (c) 12 h, (d) 24 h, (e) 36 h, and (f) 48 h. SEM and TEM images of (g)(h) MoS2 and (i)(j) CoS2 in MCS48.
Fig.3  (a) CV curves at a scan rate of 2 mV/s and (b) specific capacitance as a function of scan rate derived from their CV curves of MoS2/CoS2 composites electrodes. (c) Galvanostatic charge–discharge curves at current density of 10 A/g and (d) specific capacitance as a function of current density derived from their galvanostatic charge–discharge curves of MoS2/CoS2 composites electrodes. (e) Cycling performance at a current density of 10 A/g. (f) Nyquist plots for MoS2/CoS2 composites electrodes, and the well-fitted equivalent circuit.
Scan rate/(mV·s−1) Specific capacitance/(F·g−1)
MCS3 MCS6 MCS12 MCS24 MCS36 MCS48
2 270 356 256 301 310 490
5 242 313 211 254 284 456
10 209 285 191 235 263 427
20 176 258 169 208 242 385
30 157 239 158 193 227 359
40 142 224 147 179 215 341
50 128 209 137 167 203 323
Tab.1  Specific capacitance calculated from the CV curves of MoS2/CoS2 composites electrodes
Current density/(A·g−1) Specific capacitance/(F·g−1)
MCS3 MCS6 MCS12 MCS24 MCS36 MCS48
0.05 290 400 305 331 331 498
0.1 280 387 279 318 318 489
0.3 277 376 271 316 316 476
0.5 273 368 262 305 305 463
1 266 354 254 286 286 434
2 250 328 242 272 272 436
5 230 300 224 255 255 425
10 208 275 203 233 233 400
Tab.2  Specific capacitance calculated from the GCD curves of MoS2/CoS2 composites electrodes
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