Flow field plate of polymer electrolyte membrane fuel cells: A review

Abstract

Recently, pursuing strategic alternative to traditional fossil fuels becomes an importance method to meet the increasing energy demands and environmental improvement needs. Polymer electrolyte membrane fuel cells (PEMFC) can directly convert the chemical energy of fuels into electricity without contamination and the restriction of the Carnot cycle effect. Flow field plate (FFP) as a critical part of PEMFC is to provide the mechanical support, conductive medium, the channel of reaction gases, and water and thermal management. However, the complicated mechanisms of FFP are not very clearly understood since the materials and structures are associated closely with cost, performance and lifetime. In this paper, different materials and structures are analyzed and their characteristics are summarized. Meanwhile, an opinion was proposed that porous metal foam flow field will be the most promising development direction in the future, mainly focusing on surface treatment, pattern and manifold design.

Achieving efficient almost CO-free hydrogen production from methanol steam reforming on Cu modified α-MoC

“…The Cu active sites within the Cu/a-MoC catalyst foster the generation of substantial quantities of CO 2 and H 2 through HCOOH decomposition (eqn ( 8)). In accordance with pertinent research on MoC, a signicant presence of methoxy groups is detected at the interface of the a-MoC 1−x site, leading to the formation of CH 3 COOH, while a minor fraction of CH 3 COOH is hydrolyzed into CH 3 OH and HCOOH (eqn (7)). Eventually, HCOOH undergoes decomposition, yielding CO 2 and H 2 .…”

“…4,5 Notably, PEMFCs operate without the thermodynamic constraints imposed by the Carnot cycle, enabling more effective energy extraction from fuel sources. 6,7 Methanol, characterized by its high hydrogen-carbon ratio and low energy density, stands out as a promising candidate. Methanol is industrially synthesized through the hydrogenation of syngas derived from natural gas or coal.…”