电沉积制备多孔Ni–Fe–Sn合金电极及其析氧性能

doi:10.12034/j.issn.1009-606X.218214

过程工程学报 ›› 2019, Vol. 19 ›› Issue (1): 159-164.DOI: 10.12034/j.issn.1009-606X.218214

电沉积制备多孔Ni–Fe–Sn合金电极及其析氧性能

高莹^1,2*，吴艺辉¹，周连科²，马春生²

1. 中南大学粉末冶金国家重点实验室，湖南长沙 410083 2. 北京中材人工晶体研究院有限公司，北京 100018

收稿日期:2018-05-28 修回日期:2018-06-26 出版日期:2019-02-22 发布日期:2019-02-12
通讯作者: 高莹 15910660581@139.com

Preparation of porous Ni-Fe-Sn electrode by electrodeposition and its electrocatalytic behavior of oxygen evolution

Ying GAO^1,2*, Yihui WU¹, Lianke ZHOU¹, Chunsheng MA¹

1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, China 2. Beijing Sinoma Synthetic Crystals Co., Ltd., Beijing 100018, China

Received:2018-05-28 Revised:2018-06-26 Online:2019-02-22 Published:2019-02-12
Contact: Ying Gao 15910660581@139.com

摘要/Abstract

摘要： 采用直流电沉积法在铜箔表面合成了多孔结构的Ni–Fe–Sn合金，用扫描电子显微镜、X射线能谱仪和X射线衍射仪对合金的微观组织形貌和相态进行了表征，用电化学工作站测试了合金电极在碱性环境中的析氧性能。结果表明，Ni–Fe–Sn合金电极主要由Ni3Sn2和FeNi3相组成，电极表面形成了多孔结构。在30wt% KOH溶液中，Ni–Fe–Sn合金的析氧过电位仅为261 mV(电流密度10 mA/cm2)，Tafel斜率为69.9 mV/dec。电极在10 mA/cm2电流密度下能稳定工作12 h以上，具有良好的电化学稳定性。

关键词: Ni-Fe-Sn 合金, 析氧反应, 电解水, 电沉积

Abstract: Oxygen evolution reaction (OER) is one of the core reactions in the field of electrochemistry and subjected to a lot of studies for many years. But it is still one of the most complicated electrochemical processes and of practical importance. Specifically, the development of efficient and low-cost non-precious catalyst for the OER is still a key challenge for the renewable energy research community. In this study, electrodeposited porous nickel?iron?tin (Ni–Fe–Sn) alloy on Cu foil as an efficient OER electrocatalyst in alkaline medium was introduced. The obtained alloy was analyzed by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), respectively. The OER electrocatalytic performance of Ni–Fe–Sn alloy was investigated by linear sweep voltammetry (LSV), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronoamperometry (CP) in 30wt% KOH solution. In addition, the Ni–Fe–Sn alloy was further tested as anodes for alkaline water electrolysis during at least 12 h with good stability. The results showed that the obtained Ni–Fe–Sn alloy was composed of Ni3Sn2 and FeNi3 phases. The EDS result of Ni–Fe–Sn alloy showed the existence of three elements (Fe, Ni and Sn). SEM images displayed that the surface of the Ni–Fe–Sn alloy had porous structure, which provided more active sites for the OER. OER measurements demonstrated that the Ni–Fe–Sn alloy was highly effective for the OER with a low overpotential of 261 mV to reach 10 mA/cm2 and a small Tafel slope of 69.9 mV/dec. The excellent electrocatalytic activity, long-term stability and facile preparation method enabled Ni–Fe–Sn alloy to be a viable candidate for its widespread use in various water-splitting technologies. The better OER activity of Ni–Fe–Sn alloy in comparison to Ni–Fe alloy originated from higher electrochemical active surface area (ECSA) and the improved mass/electron transport capability due to synergetic effect between Ni, Fe, and Sn.

Key words: Ni-Fe-Sn alloy, Oxygen Evolution Reaction, Water splitting, Electrodeposition

高莹吴艺辉周连科马春生. 电沉积制备多孔Ni–Fe–Sn合金电极及其析氧性能[J]. 过程工程学报, 2019, 19(1): 159-164.

Ying GAO Yihui WU Lianke ZHOU Chunsheng MA. Preparation of porous Ni-Fe-Sn electrode by electrodeposition and its electrocatalytic behavior of oxygen evolution[J]. Chin. J. Process Eng., 2019, 19(1): 159-164.

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电沉积制备多孔Ni–Fe–Sn合金电极及其析氧性能

Preparation of porous Ni-Fe-Sn electrode by electrodeposition and its electrocatalytic behavior of oxygen evolution

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