Development And Characterization Of Powder-Derived Nickel-Based Porous Transport Layers For Anion Exchange Membrane Water Electrolysis

Abstract

Anion exchange membrane water electrolysis (AEMWE) is a promising route for sustainable green hydrogen production. In AEMWE cells, the porous transport layer (PTL) is a key component ensuring media transport, mechanical stability and electrical contact. Currently, nickel felt is the standard PTL. In the present work, we investigate powder-based PTLs as alternative due to enabling better microstructure control and – in ideal case – becoming electrochemically active itself. Therefore, nickel and nickel-iron powders were processed into PTLs via tape casting, debinding, and sintering at various temperatures yielding PTLs with adjustable porosity and microstructure. Characterization comprehends porosity measurements and microstructure analysis by SEM. Electrochemical performance was tested in a 5 cm² AEMWE cell (60 °C, 1 M KOH). Sintered PTLs showed electrochemical performance on par with commercial nickel felt. The influence of processing conditions on electrochemical performance is discussed. Coating sintered PTLs with nano catalysts suggests room for further improvement.