全水解制氢用自支撑多孔NixFe–S/NiFe2O4异质结构双功能电催化剂

严文静; 张晋涛; 吕艾静; 卢宋乐; 钟怡伟; 王明涌

doi:10.1007/s12613-022-2443-2

Volume 29 Issue 5

Apr. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(5): 1120-1131

Wenjing Yan, Jintao Zhang, Aijing Lü, Songle Lu, Yiwei Zhong, and Mingyong Wang, Self-supporting and hierarchically porous Ni_xFe–S/NiFe₂O₄ heterostructure as a bifunctional electrocatalyst for fluctuating overall water splitting, Int. J. Miner. Metall. Mater., 29(2022), No. 5, pp. 1120-1131. https://doi.org/10.1007/s12613-022-2443-2

Cite this article as:

Wenjing Yan, Jintao Zhang, Aijing Lü, Songle Lu, Yiwei Zhong, and Mingyong Wang, Self-supporting and hierarchically porous NixFe–S/NiFe2O4 heterostructure as a bifunctional electrocatalyst for fluctuating overall water splitting, Int. J. Miner. Metall. Mater., 29(2022), No. 5, pp. 1120-1131. https://doi.org/10.1007/s12613-022-2443-2

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研究论文

全水解制氢用自支撑多孔Ni_xFe–S/NiFe₂O₄异质结构双功能电催化剂

1)
钢铁冶金新技术国家重点实验室, 北京科技大学, 北京 100083, 中国
2)
稀贵金属绿色回收与提取北京市重点实验室, 北京科技大学, 北京 100083, 中国

通讯作者:
钟怡伟 E-mail: ywzhong@ustb.edu.cn

王明涌 E-mail: mywang@ustb.edu.cn

文章亮点

(1) 设计并构建了自支撑多孔Ni_xFe–S/NiFe₂O₄异质结构。

(2) Ni_xFe–S/NiFe₂O₄异质结构对水电解析氢和析氧都表现出良好的双功能催化活性。

(3)Ni_1/5Fe–S/NiFe₂O₄||Ni_1/2Fe–S/NiFe₂O₄具有良好的波动全水电解稳定性。

中文摘要

稳定的非贵金属双功能电催化剂是可再生能源驱动的波动全水电解面临的难题之一。本文在三维碳纤维布上电沉积制备了多孔Ni–Fe金属阵列，并在此基础上进行原位氧化和化学硫化，构建了一种新型的自支撑分级多孔Ni_xFe–S/NiFe₂O₄异质结构双功能电催化剂。研究结果表明，Ni_xFe–S/NiFe₂O₄异质结构催化剂对析氢反应(HER)和析氧反应(OER)都表现出良好的催化活性和稳定性，优异的催化性质与其大比表面积提供丰富的活性位点、异质结构的协同效应、超亲水表面和稳定的自支撑结构密不可分。分析结果证析氧过程异质结构中的Ni_xFe–S转化为金属氧化物/氢氧化物和Ni₃S₂。与商用20wt% Pt/C||IrO₂-Ta₂O₅相比，自支撑Ni_1/5Fe–S/NiFe₂O₄||Ni_1/2Fe–S/NiFe₂O₄在10-500mA/cm²的波动电流密度范围内表现出更好的稳定性和更低的槽电压。在500 mA/cm²的工业电流密度下，Ni_1/5Fe–S/NiFe₂O₄||Ni_1/2Fe–S/NiFe₂O₄的槽电压仅为约3.91 V，比Pt/C||IrO₂–Ta₂O₅ (约4.79 V)降低了约20%。

关键词:

Research Article

Self-supporting and hierarchically porous Ni_xFe–S/NiFe₂O₄ heterostructure as a bifunctional electrocatalyst for fluctuating overall water splitting

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Abstract

Abstract

Stable non-noble metal bifunctional electrocatalysts are one of the challenges to the fluctuating overall water splitting driven by renewable energy. Herein, a novel self-supporting hierarchically porous Ni_xFe–S/NiFe₂O₄ heterostructure as bifunctional electrocatalyst was constructed based on porous Ni–Fe electrodeposition on three-dimensional (3D) carbon fiber cloth, in situ oxidation, and chemical sulfuration. Results showed that the Ni_xFe–S/NiFe₂O₄ heterostructure with a large specific surface area exhibits good bifunctional activity and stability for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) because of the abundance of active sites, synergistic effect of the heterostructure, superhydrophilic surface, and stable, self-supporting structure. The results further confirmed that the Ni_xFe–S phase in the heterostructure is transformed into metal oxides/hydroxides and Ni₃S₂ during OER. Compared with the commercial 20wt% Pt/C||IrO₂–Ta₂O₅ electrolyzer, the self-supporting Ni_1/5Fe–S/NiFe₂O₄||Ni_1/2Fe–S/NiFe₂O₄ electrolyzer exhibits better stability and lower cell voltage in the fluctuating current density range of 10–500 mA/cm². Particularly, the cell voltage of Ni_1/5Fe–S/NiFe₂O₄||Ni_1/2Fe–S/NiFe₂O₄ is only approximately 3.91 V at an industrial current density of 500 mA/cm², which is lower than that of the 20wt% Pt/C||IrO₂–Ta₂O₅ electrolyzer (i.e., approximately 4.79 V). This work provides a promising strategy to develop excellent bifunctional electrocatalysts for fluctuating overall water splitting.
- self-supporting;
- hierarchically porous structure;
- heterostructure;
- bifunctional catalyst;
- overall water splitting

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