Enhancing Mass Transport Efficiency in High-Current Density PEMECs by Constructing Ti-Fiber Oriented Porous Transport Layers

IF 13 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Small Pub Date : 2025-03-18 DOI:10.1002/smll.202411817

Zhaolun Zhu, Xiaolong Liu, Rui Gao, Rongyu Yang, Muyu Ma, Hongwu Zhao, Yongli Li

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Abstract

The efficiency of proton exchange membrane electrolysis cells (PEMECs) is much influenced by the dynamics of gas/liquid two-phase flow at the anode side, especially at high current densities. Among different components of PEMECs, the anode porous transport layers (PTLs) are essential for mass transfer optimization. In this work, novel titanium fiber PTLs are designed and fabricated by an angle-selective stacking method. Three oriented PTLs with 30°, 60°, and 90° stacking angles are fabricated and compared with commercial titanium felt. X-ray micro-computed tomography results indicate that the oriented PTLs can avoid dead zones. Electrochemical tests and computational fluid dynamics simulations demonstrate that the oriented PTLs can enhance oxygen expulsion, and decrease mass transport resistances at high current densities. The PEMEC with the 30° PTL exhibits the best performance, with polarization voltage and mass transport resistance decreased by ≈67 mV and 16 mΩ cm², respectively, compared to that of the commercial titanium felt at the current density of 3 A cm⁻². The current work provides a new perspective on enhancing the mass transport efficiency of PTLs by orderly arranging fibers.

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来源期刊

Small 工程技术-材料科学：综合

CiteScore

17.70

自引率

3.80%

发文量

1830

审稿时长

2.1 months

期刊介绍： Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.