Hierarchical porous metal-based gas-liquid transport diffusion member and in-situ metallurgical integrated forming method and application thereof

By using a vacuum thermal diffusion bonding process to in-situ metallurgically combine the gradient pore support layer and the transition layer, the problems of contact resistance and pore collapse between the flow field plate and the porous transport layer assembly were solved, achieving efficient gas-liquid transport and mechanical stability, and improving the electrochemical performance of the electrolyzer.

CN122279641APending Publication Date: 2026-06-26CHONGQING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHONGQING UNIV
Filing Date
2026-05-09
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In the existing technology, the flow field plate and porous transport layer components have high contact resistance, easy pore collapse, and difficulty in constructing continuous gradient channels, which limits the improvement of electrolytic cell power density. Moreover, the existing methods are difficult to achieve in-situ metallurgical integration of gradient pore structure and transition layer.

Method used

Using a pre-formed ordered titanium mesh as a skeleton, the gradient porosity support layer and the transition layer are in-situ metallurgically bonded through a vacuum thermal diffusion bonding process, forming a single component without physical interfaces, and constructing a continuous electronic conduction pathway and gradient porosity network.

Benefits of technology

It effectively reduces ohmic losses, improves gas-liquid transport efficiency, avoids catalyst layer damage, achieves efficient gas-liquid two-phase transport and mechanical stability, and enhances the electrochemical performance of the electrolyzer.

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Abstract

This invention discloses a hierarchical porous metal-based gas-liquid transport and diffusion component and its forming method. It includes a gradient porous support layer with pore size decreasing in a gradient direction from the fluid inlet side to the catalyst layer side (i.e., a large-pore, low-mesh metal mesh near the fluid inlet side and a small-pore, high-mesh metal mesh near the catalyst layer side). A transition layer is disposed on the high-mesh side surface of the gradient porous support layer, and the gradient porous support layer and the transition layer are an integrated structure. The component of this invention has low ohmic impedance and high mechanical strength. It achieves ordered transport and separation of the gas and liquid phases through the gradient porous structure, and promotes water wetting and bubble desorption with the capillary driving force generated by the transition layer. This solves the problem of mutual constraint between gas-liquid mass transfer and electron conduction in water electrolysis for hydrogen production, significantly reduces the operating voltage of the electrolyzer, simplifies the stack assembly process, and is suitable for high-efficiency electrochemical energy conversion device systems such as proton exchange membrane water electrolysis and fuel cells.
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