Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2018 Supplementary Information Scalable and Ascendant Synthesis of Coated Carbon Cloth Hierarchical Core-Shell CoMoS@Co(OH) 2 for Flexible and High-Performance Supercapacitor Swati Patil 1 and Dong-Weon Lee 1, 2 * 1 MEMS and Nanotechnology Laboratory, Graduate School of Mechanical Engineering, Chonnam National University, 300 Youngbong, Buk, Gwangju 500-757, Republic of Korea 1, 2 Center for Next-Generation Sensor Research and Development, Chonnam National University, Gwangju 61186, Republic of Korea *Corresponding author: Tel: +82-62-530-1684; e-mail: mems@jun.ac.kr Figure S1 TGA and DTA profile of CoMo-hydroxide. Thermogravimetric analysis (TGA) of the CoMo-hydroxide product has been investigated by TG/DTA, Perkin Elmer TGA 7. Figure S1 presents the TG-DTA profile of CoMo-hydroxide yield weight loss in the measured temperature range. The total weight loss of 9.6 % is 1
observed in four steps. First weight loss (3.3wt %) at around 90-140 C is attributed to a loss of water molecules. The second weight loss of 1.6 wt % observed around at 140-260 ºC associated the chemical decomposition reaction of the reactants. The decomposition of ammonium molybdate is completed at about 390 ºC. Detail thermal analysis was reported by other authors substantial weight loss (3 wt%) at around 260-350 ºC is attributed to the decomposition of ammonium molybdate. In DTA analysis, the exothermic peak observed at 347 ºC, shows the exothermic combustion reaction [1]. From the TG profile, it is observed that after 350 ºC; the negligible weight loss observed that can confirm the stable phase of CoMoO 4. Hence, it is noted that the CoMo-hydroxide sample can be calcinated to a temperature as350 C to the conversion into the pure phase of CoMoO 4. Figure S2 Schematic of core-shell structures and corresponding actual FE-TEM images at low magnification of (a and d) CoMoO 4, (b and e) CoMoS and (c and f) CoMoS@Co(OH) 2, respectively. The high-resolved TEM images of (g, h) CoMoO 4 and (i) CoMoS. 2
Figure S3 (a) Cyclic voltammograms of (a) MoCo-hydroxide, (b) CoMoO 4, (c) CoMoS and (d) CoMoS@Co(OH) 2 electrodes at different scanning rates. 3
Figure S4 The charge/discharge curves of (a) CoMo-hydroxide, (b) CoMoO 4, (c) CoMoS and (d) CoMoS@Co(OH) 2 electrodes at different current densities. 4
Table. S1 Comparison of the electrochemical performance of molybdate-based electrodes to the reported values. Electrode materials Energy density Power density Reference Wh kg 1 W kg 1 CoMoS@Co(OH) 2 //AC ASC 58.1 46700 Present work Co 3 O 4 @NiMoO 4 //AC ASC 37.8 482 [2] β-comoo 4 -NiMoO 4 33 6000 [3] Co 3 O 4 @CoMoO 4 //carbon nanotubes 45.2 400 [4] CoMoO 4 @CoNiO 2 //AC 11.33 14280 [5] NiCo 2 O 4 @CoMoO 4 //AC//graphene 29.52 11420 [6] CoMoO 4 /PPy//AC 26.37 12100 [7] Co 3 S 4 /CoMo 2 S 4 @rgo//ac ASC 31.1 850 [8] MoS 2 /Mo//AC 31.1 743 [9] CoMoS4//rGO 27.2 400 [10] hybrid supercapacitor 5
Figure S5 The surface micrographs of (a) CoMo-hydroxide, (b) CoMoO 4, (c) CoMoS and (d) CoMoS@Co(OH) 2 electrodes after electrochemical cycling. 6
Figure S6 The XPS analysis of the CoMoS@Co(OH) 2 electrode after electrochemical cycling. 7
Figure S7 (a) Cyclic voltammograms at higher scanning rates, (b) scan rate dependence specific capacitance of the CoMoS@Co(OH) 2 //AC full cell device and the inset shows the capacitance rate with scan rate. (c) Capacitance performance of the full cell with current rates ranging from 70 to 100 ma cm -2. (d) Frequency dependent capacitance plot of the full cell device. 8
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