原位构建多尺度、多孔NiFeZn/NiZn-Ni异质结用于高效全水解

In-situ building of multiscale porous NiFeZn/NiZn-Ni heterojunction for superior overall water splitting

李雅馨 ¹杨红晓 ¹张秋萍 ¹简天真 ¹马文庆 ¹徐彩霞 ¹周秋霞²

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作者信息

1. 济南大学前沿交叉科学研究院(iAIR),济南 250022
2. 西南医科大学医学信息与工程学院,泸州 646000
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摘要

开发高效非贵金属双功能电解水催化剂对于促进析氧反应(OER)和析氢反应(HER)的动力学至关重要.采用电沉积-退火-腐蚀策略,在泡沫镍(NF)表面原位制备一种具有三重异质界面的自支撑、多尺度多孔NiFeZn/NiZn-Ni异质结催化剂(NiFeZn/NiZn-Ni/NF).独特的多界面工程和三维多孔骨架显著提高了物质传输效率,增强了电子相互作用,实现了超强的水分解双功能电催化性能.在碱性溶液中及600mA/cm2的电流密度下,NiFeZn/NiZn-Ni/NF催化剂使HER和OER的过电位分别降低至187和320 mV,且连续催化超过150 h几乎无活性损失.此外,使用NiFeZn/NiZn-Ni/NF作为阴极和阳极组装的电解槽分别在1.796和1.901 V的电池电压下获得了600和1000 mA/cm2的电流密度,并在50 mA/cm2电流密度和时间超过100 h条件下仍保持极高的稳定性.NiFeZn/NiZn-Ni/NF作为低成本、高效的双功能催化剂在全水解领域显示出潜在的应用前景.

Abstract

The development of efficient nonprecious bifunctional electrocatalysts for water electrolysis is crucial to enhance the sluggish kinetics of the oxygen evolution reaction(OER)and hydrogen evolution reaction(HER).A self-supporting,multiscale porous NiFeZn/NiZn-Ni catalyst with a triple interface heterojunction on nickel foam(NF)(NiFeZn/NiZn-Ni/NF)was in-situ fabricated using an electroplating-annealing-etching strategy.The unique multi-interface engineering and three-dimensional porous scaffold significantly modify the mass transport and electron interaction,resulting in superior bifunctional electrocatalytic performance for water splitting.The NiFeZn/NiZn-Ni/NF catalyst demonstrates low overpotentials of 187 mV for HER and 320 mV for OER at a current density of 600 mA/cm2,along with high durability over 150 h in alkaline solution.Furthermore,an electrolytic cell assembled with NiFeZn/NiZn-Ni/NF as both the cathode and anode achieves the current densities of 600 and 1000 mA/cm2 at cell voltages of 1.796 and 1.901 V,respectively,maintaining the high stability at 50 mA/cm2 for over 100 h.These findings highlight the potential of NiFeZn/NiZn-Ni/NF as a cost-effective and highly efficient bifunctional electrocatalyst for overall water splitting.

关键词

NiFeZn合金/多重界面/多孔结构/脱合金化/全水解

Key words

NiFeZn alloy/multiple interface/porous structure/dealloying/overall water splitting

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基金项目

National Natural Science Foundation of China(52201254)

Natural Science Foundation of Shandong Province,China(ZR2023ME155)

Natural Science Foundation of Shandong Province,China(ZR2020MB090)

Natural Science Foundation of Shandong Province,China(ZR2020QE012)

Natural Science Foundation of Shandong Province,China(ZR2020MB027)

Project of"20 Items of University"of Jinan,China(202228046)

Taishan Scholar Project of Shandong Province,China(tsqn202306226)

出版年

2024

中国有色金属学报(英文版)

中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCD

影响因子：1.183

ISSN：1003-6326

参考文献量9

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