<strong>FeCoNiMoCr</strong>高熵合金薄膜电极的电催化析氧性能

doi:10.11901/1005.3093.2020.233

材料研究学报

2021, Vol. 35

Issue (3): 193-200 DOI: 10.11901/1005.3093.2020.233

研究论文

本期目录 | 过刊浏览

FeCoNiMoCr高熵合金薄膜电极的电催化析氧性能

张泽灵¹^,², 王世琦¹^,², 徐邦利¹, 赵昱皓¹, 张旭海¹^,², 方峰¹^,²(

)

^1.东南大学材料科学与工程学院南京 211189
^2.东南大学江苏省先进金属材料高技术研究重点实验室南京 211189

Electrocatalytic Oxygen Evolution Performance of High Entropy FeCoNiMoCr Alloy Thin Film Electrode

ZHANG Zeling¹^,², WANG Shiqi¹^,², XU Bangli¹, ZHAO Yuhao¹, ZHANG Xuhai¹^,², FANG Feng¹^,²(

)

^1.School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
^2.Jiangsu Key Laboratory of Advanced Metallic Materials, Southeast University, Nanjing 211189, China

引用本文:

张泽灵, 王世琦, 徐邦利, 赵昱皓, 张旭海, 方峰. FeCoNiMoCr高熵合金薄膜电极的电催化析氧性能[J]. 材料研究学报, 2021, 35(3): 193-200.
Zeling ZHANG, Shiqi WANG, Bangli XU, Yuhao ZHAO, Xuhai ZHANG, Feng FANG. Electrocatalytic Oxygen Evolution Performance of High Entropy FeCoNiMoCr Alloy Thin Film Electrode[J]. Chinese Journal of Materials Research, 2021, 35(3): 193-200.

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摘要:

用磁控溅射法在Ti基底上沉积了FeCoNiMoCr高熵合金薄膜并制成电极，用SEM和EDS观察和分析了电极表面和横截面的形貌和元素分布，用表面轮廓测量仪测量了电极的表面粗糙度，用XRD分析了电极的物相和结构，使用电化学工作站表征了电极的电化学性能。结果表明，电极的表面粗糙、元素分布均匀，电极上的膜厚约为2.40 μm，薄膜呈非晶态。电极在碱性溶液中表现出良好的析氧性能和稳定性。在电流密度为10.0 mA/cm²条件下，过电位为360 mV、Tafel斜率为73.45 mV/dec。在过电位为360 mV的条件下连续使用24 h，电流密度没有明显的衰减。循环伏安实验和电化学阻抗分析的结果表明，FeCoNiMoCr高熵合金薄膜本征催化活性的提高使电极的电催化析氧性能优于贵金属RuO₂(过电位为409 mV，Tafel斜率为94.18 mV/dec)。

关键词 ：金属材料, 高熵薄膜电极, 析氧性能, 磁控溅射, 非晶

Abstract：

Thin film of high entropy FeCoNiMoCr alloy was deposited on Ti substrate by magnetron sputtering method to obtain high entropy film electrode. The surface morphology, composition, phase constituent, structure and performance of the electrode were characterized by means of surface profilometer, SEM-EDS, XRD and electrochemical workstation. The results show that the electrode surface is rough, the constituent elements are evenly distributed, the film thickness is about 2.40 μm, and the film is amorphous. The electrode showed good oxygen evolution performance and good stability in the alkaline solution. Under the condition of current density of 10.0 mA/cm², the overpotential was 360 mV, the Tafel slope was 73.45 mV/dec. Under the condition of overpotential of 360 mV, the current density was not significantly attenuated after continuous use for 24 hours. The results of cyclic voltammetry and electrochemical impedance analysis show that due to the improved intrinsic catalytic activity, the film electrode have electrocatalytic oxygen evolution performance better than that of the noble metal oxide RuO₂(over potential 409 mV, Tafel slope 94.18 mV/dec).

Key words： metallic materials high-entropy thin film electrode oxygen evolution performance magnetron sputtering amorphous microcrystalline

收稿日期: 2020-06-16

ZTFLH:

TB430.4030

基金资助:江苏省333工程资助项目(BRA2018045);江苏省自然科学基金(BK20180264)

作者简介: 张泽灵，女，1996年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.233 或 https://www.cjmr.org/CN/Y2021/V35/I3/193

表1 高熵薄膜电极的制备工艺参数

图1 高熵薄膜电极表面的SEM照片、EDS能谱以及表面元素分布

图2 基底和高熵薄膜电极表面的SEM照片

图3 高熵薄膜电极和基底的轮廓曲线

图4 高熵薄膜电极横截面的元素分布

图5 高熵薄膜电极和基底的XRD衍射图谱以及高熵薄膜电极的掠入射X射线衍射图谱

图6 电极的LSV曲线（内插图为根据电化学活性面积归一化后的LSV曲线）、Tafel斜率、电流密度差与扫描速率的关系图以及EIS曲线(符号：实验值；实线：模拟值；内插图：等效电路)

表2 电极的析氧反应动力学参数

图7 在360 mV过电位条件下高熵薄膜电极的计时电流曲线

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