超级电容器
过渡金属
拉曼光谱
电化学
扫描电子显微镜
热液循环
析氧
材料科学
光致发光
水平扫描速率
光谱学
金属
氧气
化学工程
化学
分析化学(期刊)
催化作用
电极
物理化学
循环伏安法
冶金
光电子学
有机化学
生物化学
物理
复合材料
量子力学
色谱法
光学
工程类
作者
B. Jansi Rani,S.S. Pradeepa,Zinab M. Hasan,G. Ravi,R. Yuvakkumar,Sun Ig Hong
标识
DOI:10.1016/j.jpcs.2019.109240
摘要
Multifunctional transition metal (Mo, Co, Cu) sulphide electrocatalysts were synthesized employing hydrothermal method with stabilization at 180 °C for 24 h for both supercapacitors and water splitting applications. Rhombohedral (MoS2) and hexagonal (CoS and CuS) structures of the electrocatalysts were identified from the X-ray diffraction patterns. Raman-active modes confirmed the characteristic phonon vibrations. The prepared sulphides optical studies were examined employing photoluminescence spectroscopy and UV spectroscopy. Morphological variations observed for different sulphide nanostructures were confirmed by the scanning electron microscopy images. A comparative electrochemical study of MoS2, CoS and CuS was performed. Of the three candidates, MoS2 has superior capacitive behaviour, exhibiting very high specific capacitance of 513F/g at 0.5 A/g, and moreover exhibited the highest oxygen evolution reaction current density of 442.7 mA/g at a scan rate of 10 mV/s. Furthermore, it maintained its performance for longer in 1000 cycles of galvanostatic charging and discharging and in 12 h of an oxygen evolution reaction stability test.
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