化工新型材料

化工新型材料 ›› 2024, Vol. 52 ›› Issue (9) : 158-162. DOI: 10.19817/j.cnki.issn1006-3536.2024.09.045

科学研究

La_xCo_0.5Mn_0.5O₃/MXene复合材料的制备及电催化性能研究

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Preparation and electrocatalytic performance of La_xCo_0.5Mn_0.5O₃/MXene composites

Wang Kai, Dong Xiaozhong, Yan Rui, Wu Hao, Zhao Qing

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Received
2024-05-07
Issue Date	Revised Date
2024-09-29	2024-05-07

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摘要

采用溶胶-凝胶法制备了空位掺杂的La_xCo_0.5Mn_0.5O₃钙钛矿材料。利用MXene特殊的二维结构,分别采用球磨法和冷凝回流法将其与La_xCo_0.5Mn_0.5O₃复合制备了La_xCo_0.5Mn_0.5O₃/MXene复合材料。分别采用X射线衍射(XRD)、扫描电子显微镜(SEM)、电感耦合等离子体发射光谱(ICP)对材料的结构、微观形貌和元素组成进行了表征测试,借助旋转圆盘电极研究了La_xCo_0.5Mn_0.5O₃/MXene复合材料的氧还原和氧析出催化性能。结果表明:冷凝回流法制备的La_xCo_0.5Mn_0.5O₃/MXene复合材料性能优于球磨法制备的样品,当A位La为0.7时,La_0.7Co_0.5Mn_0.5O₃具有纳米棒状微观形貌,La_0.7Co_0.5Mn_0.5O₃/MXene复合材料具有最好的氧还原性能和较好的氧析出性能,即氧还原电位为0.74V,氧析出过电位为560mV。

Abstract

In this paper,La_xCo_0.5Mn_0.5O₃ perovskite materials doped with vacancy were prepared by sol-gel method.La_xCo_0.5Mn_0.5O₃/MXene composites were prepared by using MXene with the special two-dimensional structure and the La_xCo_0.5Mn_0.5O₃ by means of ball milling method and condensation reflux method,respectively.X-ray diffraction (XRD),scanning electron microscopy (SEM) and inductively coupled plasma emission spectroscopy (ICP) were used to characterize the structure,microstructure and elemental composition of the La_xCo_0.5Mn_0.5O₃/MXene composites.The catalytic properties of oxygen reduction and oxygen evolution of the La_xCo_0.5Mn_0.5O₃/MXene composites were studied by means of rotating disk electrode.It was shown that the La_xCo_0.5Mn_0.5O₃/MXene composite prepared by condensation reflux method had better performance than the sample prepared by ball milling method.When the La in A-position was 0.7,the La_0.7Co_0.5Mn_0.5O₃ sample had nanorod-like microstructure,and the La_0.7Co_0.5Mn_0.5O₃/MXene composite had the best oxygen reduction property and better oxygen evolution property,with an oxygen reduction potential of 0.74V,and an oxygen evolution overpotential of 560mV.

关键词

La_xCo_0.5Mn_0.5O₃钙钛矿 / MXene / 溶胶-凝胶法 / 电催化

Key words

La_xCo_0.5Mn_0.5O₃ perovskite / MXene / sol-gel method / electrocatalysis

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La_xCo_0.5Mn_0.5O₃/MXene复合材料的制备及电催化性能研究[J]. 化工新型材料, 2024, 52(9): 158-162 DOI:10.19817/j.cnki.issn1006-3536.2024.09.045

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