It is expected that electrocatalysts will be highly active, with a low-loading of critical raw materials < 0.1 mg/W and used to demonstrate operation at current densities > 1.0 A/cm² at cell potentials below 1.8 V, with alkaline concentrations of <1 mol/l and an electricity consumption below 50 kWh/kg. The temperature at which the applied membrane material properly functions is expected to be lower than 90 ⁰C. To achieve the targets, all components have to be optimised in terms of pressure, chemical and corrosion stability as well as their performance and durability. In particular, new AEMs, low-loading of critical raw materials electrocatalysts and porous transport layer (PTL) structures should be developed, and their implementation in catalyst coated substrate (CCS), catalyst-coated membranes (CCMs) and membrane electrode assemblies (MEA) is expected to be studied.

Targeted prototype scale and cell size should be appropriate for targeted applications and future scale-up. The proposal should target at the end of the project the construction of a stack of minimum 50 kWel with an active area of at least 500 cm² and designed to operate at >50 bars of output pressure. The short stack should exhibit a minimum operation performance of current densities > 1.0 A/cm² at cell potentials below 1.8 V with alkaline concentrations of <1 mol/l. Under these, conditions degradation rates of <0.7 %/1000 h should be demonstrated for a period of at least >3,000 h with the designed stack layout under the stated parameters.

Studies on possible corrosion effects and on degradation mechanism of AEM, anode and cathode electrocatalysts and PTLs should be conducted through EU harmonised testing protocols in order to be able to further predict their lifetime and identify degradation effects.

Proposals are expected to address sustainability, circularity and recycling aspects when choosing AEMs, catalysts, PTL and cell-materials, including bipolar plates. Proposals are expected to perform complete techno-economic and life cycle assessments.

Proposals should show how the developed concepts should be applied in a laboratory setting at a first step, and in a second step how they should be optimised considering the important relevant design and operating parameters (TRL5).