<strong>MnNiCoCrFe</strong>多孔高熵合金的电催化析氧性能

doi:10.11901/1005.3093.2022.135

材料研究学报

2023, Vol. 37

Issue (5): 332-340 DOI: 10.11901/1005.3093.2022.135

研究论文

本期目录 | 过刊浏览

MnNiCoCrFe多孔高熵合金的电催化析氧性能

李海龙¹^,²^,³, 牟娟¹, 王媛媛²^,³, 葛绍璠²^,³, 刘春明¹, 张海峰¹^,²^,³, 朱正旺²^,³(

)

^1.东北大学材料科学与工程学院沈阳 110819
^2.中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016
^3.中国科学院金属研究所中国科学院核用材料与安全评价重点实验室沈阳 110016

Preparation and Electrocatalytic Oxygen Evolution Performance of a Novel Porous MnNiCoCrFe High-entropy Alloy as Electrocatalytic Electrode Material

LI Hailong¹^,²^,³, MU Juan¹, WANG Yuanyuan²^,³, GE Shaofan²^,³, LIU Chunming¹, ZHANG Haifeng¹^,²^,³, ZHU Zhengwang²^,³(

)

^1.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
^2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

李海龙, 牟娟, 王媛媛, 葛绍璠, 刘春明, 张海峰, 朱正旺. MnNiCoCrFe多孔高熵合金的电催化析氧性能[J]. 材料研究学报, 2023, 37(5): 332-340.
Hailong LI, Juan MU, Yuanyuan WANG, Shaofan GE, Chunming LIU, Haifeng ZHANG, Zhengwang ZHU. Preparation and Electrocatalytic Oxygen Evolution Performance of a Novel Porous MnNiCoCrFe High-entropy Alloy as Electrocatalytic Electrode Material[J]. Chinese Journal of Materials Research, 2023, 37(5): 332-340.

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摘要:

用化学腐蚀方法制备出3D多孔自支撑型Mn₅₀Fe_12.5Co_12.5Ni_12.5Cr_12.5高熵合金。电化学测试结果表明，将这种高熵合金放入1 mol/L KOH的碱性溶液中，电流密度为10 mA·cm^-2时过电位为281 mV，Tafel斜率为63 mV/dec,表明其电催化性能优于商业RuO₂的性能。在电流密度为50 mA·cm^-2的条件下连续工作50 h，工作电压没有明显的升高，表明这种富锰高熵电催化电极材料具有优异的析氧稳定性。电化学阻抗谱表明，这种自支撑型结构的块体高熵合金催化剂具有出色的导电性，与负载型催化剂相比其电子转移能力显著提高。

关键词 ：金属材料, 电催化剂, 高熵合金, 析氧反应, 多孔结构

Abstract：

A novel three-dimensional porous self-supporting electrode material for electrochemical catalytic oxygen evolution were prepared by chemical etching method from a bulk high-entropy alloy Mn₅₀Fe_12.5Co_12.5Ni_12.5Cr_12.5. The electrochemical test results show that the overpotential of the prepared electrode material is only 281 mV at the current of 10 mA·cm^-2 and the Tafel slope is 63 mV/dec in an alkaline solution of 1 mol/L KOH, which is better than that of commercial RuO₂. At the same time, the working voltage does not increase significantly after continuous operation for 50 h at the current density of 50 mA·cm^-2, which reflects the excellent stability during electrocatalytic oxygen evolution process of the Mn-rich high-entropy porous alloy as electrocatalytic electrode material. The Nyquist plots show that the free-standing structure of the bulk HEA catalyst has outstanding electron transfer ability compared with the ordinary supported catalyst.

Key words： metallic materials electrocatalysts high-entropy alloy oxygen evolution porous structure

收稿日期: 2022-03-12

ZTFLH:

TB31

基金资助:国家自然科学基金(52074257)

作者简介: 李海龙，男，1992年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2022.135 或 https://www.cjmr.org/CN/Y2023/V37/I5/332

图1 M50高熵合金和M50A高熵催化剂的X射线衍射谱

图2 M50合金表面的SEM照片和金相腐蚀后的EDS面扫描图

图3 M50枝晶和枝晶间成分的点扫描能谱图

表1 M50枝晶和枝晶间各元素含量的分布

图4 M50A催化剂表面的SEM照片和EDS能谱

图5 M50、M50A 和RuO2的电催化析氧性能

图6 M50合金不同扫描速率的循环伏安曲线、M50A催化剂不同扫描速率的循环伏安曲线以及M50和M50A的Cdl图

图7 M50、M50A和RuO2的阻抗谱(插图分别为拟合等效电路图和局部放大图)、M50催化剂多级计时电位响应以及在恒电流密度10和50 mA·cm-2条件下M50A的稳定性

表2 不同催化剂EET的拟合参数

图8 M50A电极OER反应后表面的高分辨XPS谱

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