Effects of Diffusion Layer (DL) and ORR Catalyst (M_ORR) on the Performance of M_ORR/IrO₂/DL Electrodes for PEM-Type Unitized Regenerative Fuel Cells

Abstract

This study aims to examine the influences of substrates/diffusion layers (DL) and oxygen reduction reaction catalysts (M , revealed that the roughness factor of the DL mainly determined the electrode performance for both water electrolyzer (WE) and fuel cell (FC) operations, while the contributions of porosity and substrate material were insignificant. When Pt-Ru was utilized as the M O R R instead of Pt, WE performance was enhanced and the electrode performance was assessed by analyzing round-trip efficiencies (ε . Improved efficiency was related to the additional catalytic action by Ru toward ORR during WE operation.