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CoSe2 Nanoparticles Dispersed in WSe2 Nanosheets for Efficient Electrocatalysis and Supercapacitance Applications
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-06-01 , DOI: 10.1021/acsanm.1c00594 Mairman Muska 1 , Jing Yang , Yuan Sun , Jiahui Wang , Ye Wang , Qing Yang
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-06-01 , DOI: 10.1021/acsanm.1c00594 Mairman Muska 1 , Jing Yang , Yuan Sun , Jiahui Wang , Ye Wang , Qing Yang
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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 (η10) 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.
中文翻译：
COSE 2纳米颗粒分散在WSE 2纳米片的高效电催化和Supercapacitance应用
CoSe 2纳米颗粒分散在WSe 2纳米片中，形成异质结构的纳米杂化物，已通过热注射胶体合成工艺合成，以强化其电子功能。透射电子显微镜（TEM）图像显示，所述WSE 2 / COSE 2纳米复合物表现为COSE的粒状纳米粒子2分散在WSE 2纳米片以分散的方式，从而构建一个异质纳米结构的系统。除了微观研究外，X 射线衍射 (XRD) 图案、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。电化学研究表明，与孤立的 CoSe 2和 WSe 2相比，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组件。所述异质结构的纳米复合物的特征在于用于电催化性能与较低的超电势（η 10）和157毫伏的塔菲尔斜率值和79毫伏癸-1为HER和330毫伏和76毫伏癸-1分别为OER。同时，异质结构的纳米复合物示出非常高的电容（2720 F G -1 1 A G -1和1200 F G -1 20 A G -1），并用93.75％容量保持在20增强的循环稳定性甲克-1 , 优于孤立的 CoSe 2和 WSe 2以及大多数报道的同行。优异的电化学性能是由于通过 CoSe 2和 WSe 2之间的电子转移提高了与纳米级异质结构杂化物相关的电子电导率，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改进的离子吸附由于表面积增加。CoSe 2和WSe 2与具有调制电子结构和增加的活性位点的纳米级异质结构的杂交可以随后促进电催化和电荷电容性能。
更新日期：2021-06-25
中文翻译：
COSE 2纳米颗粒分散在WSE 2纳米片的高效电催化和Supercapacitance应用
CoSe 2纳米颗粒分散在WSe 2纳米片中，形成异质结构的纳米杂化物，已通过热注射胶体合成工艺合成，以强化其电子功能。透射电子显微镜（TEM）图像显示，所述WSE 2 / COSE 2纳米复合物表现为COSE的粒状纳米粒子2分散在WSE 2纳米片以分散的方式，从而构建一个异质纳米结构的系统。除了微观研究外，X 射线衍射 (XRD) 图案、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。电化学研究表明，与孤立的 CoSe 2和 WSe 2相比，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组件。所述异质结构的纳米复合物的特征在于用于电催化性能与较低的超电势（η 10）和157毫伏的塔菲尔斜率值和79毫伏癸-1为HER和330毫伏和76毫伏癸-1分别为OER。同时，异质结构的纳米复合物示出非常高的电容（2720 F G -1 1 A G -1和1200 F G -1 20 A G -1），并用93.75％容量保持在20增强的循环稳定性甲克-1 , 优于孤立的 CoSe 2和 WSe 2以及大多数报道的同行。优异的电化学性能是由于通过 CoSe 2和 WSe 2之间的电子转移提高了与纳米级异质结构杂化物相关的电子电导率，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改进的离子吸附由于表面积增加。CoSe 2和WSe 2与具有调制电子结构和增加的活性位点的纳米级异质结构的杂交可以随后促进电催化和电荷电容性能。
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