CoSe2 Nanoparticles Dispersed in WSe2 Nanosheets for Efficient Electrocatalysis and Supercapacitance Applications
CoSe2 Nanoparticles Dispersed in WSe2 Nanosheets for Efficient Electrocatalysis and Supercapacitance Applications
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分散在 WSe2 纳米片中的 CoSe2 纳米粒子用于高效电催化和超级电容器应用
DOI：
10.1021/acsanm.1c00594
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发表时间：
2021-06-01
影响因子：
5.9
通讯作者：
Yang, Qing
中科院分区：
文献类型：
--
作者：
Muska, Mairman;Yang, Jing;Yang, Qing
通过热注射胶态合成工艺制备了CoSe 2纳米粒子分散在WSe 2纳米片中形成异质结构纳米杂化物，以充分改善其电子功能。透射电子显微镜（TEM）图像显示，WSe 2/CoSe 2纳米杂化物呈CoSe 2分散在WSe 2纳米片中的颗粒状纳米颗粒，从而构建了一个异质纳米结构系统。X射线衍射（XRD）图谱、X射线光电子能谱（XPS）和拉曼光谱研究证实了异质结构纳米杂化物的形成以及异质结构纳米杂化物中CoSe 2和WSe 2之间的电子相互作用沿着。电化学研究表明，WSe 2/CoSe 2异质结构纳米杂化物表现出改善的酸性HER和碱性OER电催化行为，以及超级电容器性能比两个孤立的CoSe 2和WSe 2组件。异质结构纳米杂化物的电催化性能的特征在于具有较低的过电位（eta（10）），HER的Tafel斜率值分别为157 mV和79 mV dec（-1），OER的Tafel斜率值分别为330 mV和76 mV dec（-1）。同时，异质结构的纳米杂化物显示出非常高的电容（在1 A g（-1）下为2720 F g（-1），在20 A g（-1）下为1200 F g（-1））和增强的循环稳定性，在20 A g（-1）下具有93.75%的电容保持率，这上级于孤立的CoSe 2和WSe 2以及大多数报道的对应物。这种上级电化学性能是由于通过CoSe 2和WSe 2之间的电子转移而与纳米级异质结构杂化物相关的改善的电子电导率导致的，这可以促进电化学过程中表面/界面上的电荷转移反应，以及由于增加的表面积而改善的离子吸附。将CoSe 2和WSe 2杂化到具有调制电子结构和增加活性位点的纳米异质结构中可以促进随后的电催化和充电电容性能。
CoSe2 nanoparticles dispersed in WSe2 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 WSe2/CoSe2 nanohybrids present as granular nanoparticles of CoSe2 dispersed in WSe2 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 CoSe2 and WSe2 in the heterostructured nanohybrids. The electrochemical investigations demonstrated that the WSe2/CoSe2 heterostructured nanohybrids exhibit improved acidic HER and basic OER electrocatalytic behavior as well as supercapacitor performance than both of the isolated CoSe2 and WSe2 components. The heterostructured nanohybrids are characterized for electrocatalytic performance with a lower overpotential (eta(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 isolated CoSe2 and WSe2 as well as most reported counterparts. The superior electrochemical performance is resulted from an improved electronic conductivity related to the nanoscale heterostructured hybrids through transfer of electrons between CoSe2 and WSe2 that could facilitate the charge-transfer reactions on the surface/interface in an electrochemical process as well as improved ion adsorption due to an increased surface area. Hybridization of CoSe2 and WSe2 to the nanoscale heterostructures with modulated electronic structures and increased active sites could promote the electrocatalysis and charge capacitance performances subsequently.