CoSe 2 Nanoparticles Dispersed in WSe 2 Nanosheets for Efficient Electrocatalysis and Supercapacitance Applications

作者：Mairman Muska, Jing Yang, Yuan Sun, Jiahui Wang, Ye Wang, Qing Yang · 发表于：ACS Applied Nano Materials · 年份：2021 · DOI：10.1021/acsanm.1c00594 · 被引用次数：71 · 研究领域：Electrocatalysts for Energy Conversion、Supercapacitor Materials and Fabrication、2D Materials and Applications

CoSe 2 nanoparticles dispersed in WSe 2 nanosheets forming heterostructured nanohybrids have been synthesized by a hot-injection colloidal synthesis process for refining their electronic functionalities intensively. Transmission electron microscopy (TEM) images reveal that the WSe 2 /CoSe 2 nanohybrids present as granular nanoparticles of CoSe 2 dispersed in WSe 2 nanosheets in a scattered way, thus constructing a heteronanostructured system. X-ray diffraction (XRD) patterns, X-ray photoelectron spectroscopy (XPS), and Raman spectroscopic studies besides the microscopic investigations confirmed the formation of the heterostructured nanohybrids along with the electronic interaction between CoSe 2 and WSe 2 in the heterostructured nanohybrids. The electrochemical investigations demonstrated that the WSe 2 /CoSe 2 heterostructured nanohybrids exhibit improved acidic HER and basic OER electrocatalytic behavior as well as supercapacitor performance than both of the isolated CoSe 2 and WSe 2 components. The heterostructured nanohybrids are characterized for electrocatalytic performance with a lower overpotential (η 10 ) and Tafel slope values of 157 mV and 79 mV dec –1 for HER and 330 mV and 76 mV dec –1 for OER, respectively. Meanwhile, the heterostructured nanohybrids illustrated very high capacitance (2720 F g –1 at 1 A g –1 and 1200 F g –1 for 20 A g –1 ) and an enhanced cyclic stability with 93.75% capacitance retention at 20 A g –1, which is superior to that of both of isolat...