Tuning the oxygen vacancies and mass transfer of porous conductive ceramic supported IrOx catalyst via polyether-derived composite oxide pyrolysis: Toward a highly efficient oxygen evolution reaction catalyst for water electrolysis

IF 23.2 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Advanced Composites and Hybrid Materials Pub Date : 2024-03-01 DOI:10.1007/s42114-024-00862-1

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Abstract

Slow oxygen evolution reaction (OER) and material transport impedance in catalyst-coated membrane (CCM) are major challenges for the practical proton exchange membrane water electrolyzer (PEMWE). Herein, we present a novel OER catalyst by polyether-derived composite oxide pyrolysis with a multilevel porous support and abundant oxygen vacancies to boost efficiency and durability in water electrolysis. The formation of a heterointerface with abundant oxygen vacancies in IrO_x improves the catalytic activity and prevents IrO_x from peroxidation. Furthermore, the unique pore structure of the support facilitates the mass transport of the anode catalyst layer during water electrolysis at high current density, and the mass transport resistance of the water electrolyzer is only 0.0154 Ω cm² at 1.5 A cm⁻². When used in a PEMWE, the prepared electrocatalysts have an impressive electrochemical performance of 1.87 V at 3·A cm⁻² with an Ir loading of only 0.91 mg cm⁻². This approach highlights the importance of oxygen vacancies and transportation in the catalyst-support interface, providing a promising solution for high-rate practical water electrolysis.

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Efficient OER supported catalysts enriched with oxygen vacancies for PEMWE applications

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通过聚醚衍生复合氧化物热解调节多孔导电陶瓷支撑的 IrOx 催化剂的氧空位和传质：开发用于水电解的高效氧进化反应催化剂

摘要催化剂涂层膜（CCM）中缓慢的氧进化反应（OER）和材料传输阻抗是实用质子交换膜水电解槽（PEMWE）面临的主要挑战。在此，我们提出了一种新型 OER 催化剂，它由聚醚衍生的复合氧化物热解而成，具有多级多孔支撑和丰富的氧空位，可提高水电解的效率和耐久性。在 IrOx 中形成具有丰富氧空位的异质界面可提高催化活性并防止 IrOx 过氧化。此外，支撑物独特的孔隙结构有利于阳极催化剂层在高电流密度水电解过程中的质量传输，在 1.5 A cm-2 的条件下，水电解槽的质量传输电阻仅为 0.0154 Ω cm2。在 PEMWE 中使用所制备的电催化剂时，其电化学性能令人印象深刻，在 3-A cm-2 条件下可达到 1.87 V，而 Ir 负载仅为 0.91 mg cm-2。这种方法突出了催化剂-支撑界面中氧空位和传输的重要性，为高速实用水电解提供了一种前景广阔的解决方案。图表摘要用于 PEMWE 应用的富含氧空位的高效 OER 支撑催化剂

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来源期刊

Advanced Composites and Hybrid Materials Multiple-

CiteScore

26.00

自引率

21.40%

发文量

185

期刊介绍： Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.