Dynamic template reconstruction induced mesoporous iridium catalysts for high-current-density PEMWE

IF 35.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Joule Pub Date : 2025-09-17 DOI:10.1016/j.joule.2025.102058

Chenyang Wei , Cheng Liu , Zeyu Zhang , Kai Sun , Chengkun Xing , Wenjuan Shi , Youyong Li , Jian-Feng Li , Bo Zhang

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Abstract

Enhancing current density is a crucial strategy for reducing costs and improving the efficiency of green hydrogen production through water electrolysis. However, mass diffusion and proton transport limitations under high-current densities remain serious obstacles. Here, we proposed a novel strategy to construct a three-dimensional mesoporous skeleton structure of IrO₂ to address the limitations. By utilizing the dynamic loading of Ir nanoparticles during the La₂O₃ template reconstruction process, high-density embedding of ultra-small Ir nanoparticles in the template is achieved. During the electrochemical process, in situ oxidation of Ir nanoparticles combined with template leaching results in the formation of a three-dimensional, mesoporous IrO₂ structure. The developed catalyst enables proton exchange membrane water electrolysis (PEMWE) to achieve stable operation for over 2,700 h at a current density of 5 A cm⁻² with a voltage degradation rate of ∼0.38 μV h⁻¹, which meets the 2030 EU Clean Hydrogen JU target and 2026 US Department of Energy (DOE) target.

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动态模板重建诱导高电流密度PEMWE介孔铱催化剂

提高电流密度是降低水电解绿色制氢成本和提高效率的关键策略。然而，在高电流密度下的质量扩散和质子输运限制仍然是严重的障碍。在此，我们提出了一种新的策略来构建三维介孔IrO2骨架结构，以解决这些限制。利用La2O3模板重构过程中Ir纳米颗粒的动态加载，实现了超小Ir纳米颗粒在La2O3模板中的高密度嵌入。在电化学过程中，Ir纳米颗粒的原位氧化结合模板浸出导致三维介孔IrO2结构的形成。该催化剂可使质子交换膜电解（PEMWE）在5 a cm−2的电流密度下稳定运行2700小时以上，电压降解率为0.38 μV h−1，满足2030年欧盟清洁氢JU目标和2026年美国能源部（DOE）目标。

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来源期刊

Joule Energy-General Energy

CiteScore

53.10

自引率

2.00%

发文量

198

期刊介绍： Joule is a sister journal to Cell that focuses on research, analysis, and ideas related to sustainable energy. It aims to address the global challenge of the need for more sustainable energy solutions. Joule is a forward-looking journal that bridges disciplines and scales of energy research. It connects researchers and analysts working on scientific, technical, economic, policy, and social challenges related to sustainable energy. The journal covers a wide range of energy research, from fundamental laboratory studies on energy conversion and storage to global-level analysis. Joule aims to highlight and amplify the implications, challenges, and opportunities of novel energy research for different groups in the field.