铁掺杂多孔非晶镍磷酸盐材料制备及阴离子交换膜电解水制氢

doi:10.15541/jim20250463

摘要/Abstract

摘要： 高效稳定的双功能非贵金属电催化材料对于降低电解水制氢成本至关重要。本研究通过电沉积结合化学刻蚀策略,在镍泡沫(Nickel Foam,NF)上构筑了铁掺杂的多孔镍磷酸盐非晶催化材料(Fe-NiOP/NF)。该策略通过电沉积法在导电基底镍泡沫上可控制备纳米薄膜,并利用化学刻蚀原位诱导薄膜产生多孔结构。多孔结构有利于电解液传质和气体析出,铁掺杂诱导电荷从Ni到Fe的转移,有效优化了活性位点Ni的电子结构,基于电化学活性面积(ECSA)归一化的本征活性比较,Fe-NiOP/NF较未掺杂Fe的样品提升了约2.95倍。此外,Fe-NiOP/NF催化材料在析氢和析氧反应中均表现出优异的双功能催化活性,在500 mA·cm^-2电流密度下,其析氢和析氧过电位分别为246和291 mV。Fe-NiOP/NF作为双功能催化材料的阴离子交换膜电解水(AEMWE)器件,在70 ℃实现了1.92 V@1 A·cm^-2和2.13 V@2 A·cm^-2的催化性能,并能够在1 A·cm^-2大电流密度下稳定运行200 h以上。本研究开发的Fe-NiOP/NF电催化材料的合成方法简便,并且兼具高性能与高稳定性的优点,为开发适用于工业级绿氢生产的电极材料提供了新方法。

关键词: 氢能, 多孔结构, 非晶材料, 大电流密度, 阴离子交换膜电解水

Abstract: Efficient and stable bifunctional non-noble metal electrocatalytic materials are essential to reduce the cost of hydrogen production by electrolysis. This study constructed iron-doped hierarchical porous amorphous nickel phosphate catalytic materials (Fe-NiOP/NF) on nickel foam (NF) using an electrodeposition combined with chemical etching strategy. This strategy allows the controllable preparation of nanosheets on the conductive substrate nickel foam by electrodeposition and in-situ induction of the nanosheets to a porous structure by chemical etching. The porous structure facilitates mass transfer of electrolyte and gas evolution. Iron doping effectively optimizes the electronic structure of active site Ni by triggering charge redistribution from Ni to Fe. The intrinsic activity normalized by electrochemical active surface area (ECSA) increases by approximately 2.95 times compared to the undoped sample. The Fe-NiOP/NF catalytic material exhibits excellent bifunctional catalytic activity in both the hydrogen evolution reaction and the oxygen evolution reaction, with a hydrogen evolution overpotential of 246 mV and an oxygen evolution overpotential of 291 mV at a current density of 500 mA·cm^-2. When used as a bifunctional catalytic material in anion exchange membrane watersis (AEMWE) devices, Fe-NiOP/NF achieves catalytic performances of 1.92 V@1 A·cm^-2 and 2.13 V@2 A·cm^-2 at 70 ℃, and operates steadily for longer than 200 h at a current density of 1 A·cm^-2. The electrocatalytic material Fe-NiOP/NF developed in this study possesses the advantages of simple synthesis method, high performance, and high stability, providing a new method for development of the electrode for industrial-level green hydrogen production.

Key words: hydrogen energy, porous structure, amorphous material, large current density, anion exchange membrane water electrolysis

中图分类号:

TQ116

高卯, 唐春, 陈明, 钟勇斌, 王鑫, 丁毅, 文俊元, 周莹. 铁掺杂多孔非晶镍磷酸盐材料制备及阴离子交换膜电解水制氢[J]. 无机材料学报, DOI: 10.15541/jim20250463.

GAO Mao, TANG Chun, CHEN Ming, ZHONG Yongbin, WANG Xin, DING Yi, WEN Junyuan, ZHOU Ying. Synthesis of Iron-Doped Porous Amorphous Nickel Phosphate and Its Application in Hydrogen Production via Anion Exchange Membrane Water Electrolysis[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20250463.

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