Triple-Layer Porous Transport Layers with Ultra-High Porosity for Enhanced Oxygen Transport and Catalyst Utilization in Water Electrolysis.

IF 36.3 1区材料科学 Q1 Engineering

Nano-Micro Letters Pub Date : 2025-06-30 DOI:10.1007/s40820-025-01831-z

Seong Hyun Park, Young Je Park, Seungsoo Jang, Pilyoung Lee, Soobin Yoon, Young-June Park, Chi-Young Jung, Kang Taek Lee

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Abstract

The commercialization of proton exchange membrane water electrolysis (PEMWE) for green hydrogen production hinges on the development of low-cost, high-performance titanium porous transport layers (PTLs). This study introduces a triple-layer Ti-PTL with a graded porous structure and a 75% ultra-high porosity backing layer, fabricated through tape casting and roll calendering. This triple-layer PTL, composed of a microporous layer, an interlayer, and a highly porous backing layer, enhances catalyst utilization, mechanical integrity, and mass transport. Digital twin technology using X-ray revealed increased contact area and triple-phase boundary at the interface with the catalyst layer, significantly improving oxygen evolution reaction kinetics. Numerical simulations demonstrated that the strategically designed porous structure of the triple-layer PTL facilitates efficient oxygen transport, mitigates oxygen accumulation, and improves reactant accessibility. Electrochemical evaluations showed improved performance, achieving 127 mV reduction in voltage at 2 A cm^-2 compared to a commercial PTL, highlighting its potential to enhance PEMWE efficiency and cost-effectiveness.

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超高孔隙率的三层多孔输运层在水电解中的氧输运和催化剂利用。

绿色制氢的质子交换膜水电解（PEMWE）的商业化取决于低成本、高性能钛多孔传输层（PTLs）的发展。本研究介绍了一种三层Ti-PTL，该Ti-PTL具有梯度多孔结构和75%超高孔隙率的背衬层，通过带式铸造和轧辊压延制成。这种三层PTL由微孔层、中间层和高孔底层组成，提高了催化剂的利用率、机械完整性和质量传输。使用x射线的数字孪生技术显示，与催化剂层界面的接触面积和三相边界增加，显着改善了析氧反应动力学。数值模拟表明，精心设计的三层PTL多孔结构有助于有效的氧气输送，减轻氧气积累，提高反应物的可及性。电化学评估表明，与商业PTL相比，PEMWE的性能得到了改善，在2 A cm-2的电压下降低了127 mV，突出了其提高PEMWE效率和成本效益的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano-Micro Letters NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

32.60

自引率

4.90%

发文量

981

审稿时长

1.1 months

期刊介绍： Nano-Micro Letters is a peer-reviewed, international, interdisciplinary, and open-access journal published under the SpringerOpen brand. Nano-Micro Letters focuses on the science, experiments, engineering, technologies, and applications of nano- or microscale structures and systems in various fields such as physics, chemistry, biology, material science, and pharmacy.It also explores the expanding interfaces between these fields. Nano-Micro Letters particularly emphasizes the bottom-up approach in the length scale from nano to micro. This approach is crucial for achieving industrial applications in nanotechnology, as it involves the assembly, modification, and control of nanostructures on a microscale.