钽掺杂低铱催化剂：构筑及其酸性氧析出性能研究

doi:10.15541/jim20260161

摘要/Abstract

摘要： 开发兼具高活性、高稳定性与低铱载量的阳极催化剂是推动质子交换膜电解水制氢技术规模化应用的关键。因此,本研究提出了一种通过改良的Adams熔融法在二氧化铱中掺杂高价态钽(Ta)以构建丰富氧空位(O_V)的Ta-IrO₂催化剂的策略。掺杂Ta⁵⁺为Ta-IrO₂催化剂引入了较高的氧空位浓度,有效改善了催化活性,使其在酸性析氧反应中表现出优异的电催化性能,在10 mA·cm^-2电流密度下过电位(仅为196 mV)低于商用IrO₂(289 mV),塔菲尔斜率(47.13 mV·dec^-1)较小,展现出更快的反应动力学,并且其具有高的质量活性(1.6 V, 2187 mA·mg_Ir^-1)。其次,生成的Ta-O键有效稳定了催化中心,使Ta-IrO₂催化剂在10 mA·cm^-2下可稳定运行450 h,显示出良好的耐久性。此外,Ta-IrO₂催化剂中铱的载量0.13 mg_Ir cm^-2,达到了在显著降低贵金属用量的同时提升性能的目标。本研究为通过高价金属掺杂工程化设计高性能、低铱载量的析氧反应催化剂提供了有效的方案。

关键词: 二氧化铱, 氧空位, 钽掺杂, 析氧反应(OER), 铱载量

Abstract: The development of anode catalysts that combine high activity, high stability, and low iridium loading is key to advancing the large-scale application of proton exchange membrane water electrolysis for hydrogen production. Therefore, this study proposes a strategy to construct Ta-IrO₂ catalysts rich in oxygen vacancies (O_V) by doping high-valent tantalum (Ta) into iridium dioxide using a modified Adams fusion method. Doping of Ta⁵⁺ introduced a high concentration of oxygen vacancies into the Ta-IrO₂ catalyst, effectively enhancing its catalytic activity. This enabled the catalyst to exhibit excellent electrocatalytic performance in the acidic oxygen evolution reaction, with an overpotential of only 196 mV at a current density of 10 mA·cm^-2, which is lower than that of commercial IrO₂ (289 mV), and a lower Tafel slope (47.13 mV·dec^-1), indicating faster reaction kinetics, and a high mass activity (1.6 V, 2187 mA·mg_Ir^-1). Furthermore, the formed Ta-O bonds effectively stabilize the catalytic sites, enabling the Ta-IrO₂ catalyst to operate stably for 450 h at 10 mA·cm^-2, demonstrating excellent durability. Additionally, the iridium loading of 0.13 mg_Ir·cm^-2 in the Ta-IrO₂ catalyst validates the objective of enhancing performance while significantly reducing the amount of precious metal used. This study provides an effective strategy for the engineered design of high-performance, low-Ir-loading oxygen evolution reaction catalysts through the doping of high-valent metals.

Key words: iridium dioxide, oxygen vacancies, tantalum doping, oxygen evolution reaction (OER), Ir loading

中图分类号:

TQ116

叶星辰, 王现英, 王绍岩. 钽掺杂低铱催化剂：构筑及其酸性氧析出性能研究[J]. 无机材料学报, DOI: 10.15541/jim20260161.

YE Xingchen, WANG Xianying, WANG Shaoyan. Tantalum Doped IrO₂ Catalyst: Construction and Its Acidic Oxygen Evolution Performance[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20260161.

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