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Figure 1.1: Iridium specific power density and the related installation capacity for PEMWE (assuming one ton of iridium available per year for PEMWE) comparing state of the art technology (loading of 2 mg Ir/cm2) the needed improvement in iridium utilization to reach the target of 100 GW/year [2]. is still produced at a rate two orders of magnitude higher than that of iridium. Additionally, due to its exceptional catalytic activity and superior utilization, only 0.01 g Pt/kW is necessary, which then corresponds to one ton of platinum consumption per year for 100 GW/year of PEMWE growth [2]. Thus, while it is desirable to replace platinum at the PEMWE cathode with something less expensive, the current usage of iridum at the PEMWE anode is a fundamental obstacle limiting the growth of PEMWE technology. Anion exchange membrane water electrolysis (AEMWE) is a promising new development that attempt to combine the advantages of both AWE and PEMWE. The inherently alkaline membrane is less corrosive and allows for the replacement of iridium with nickel-based catalysts similar to those used for AWE. These devices have shown promise to achieve practical current densities but suffer from membrane and ionomer instability. They are currently available commercially, although only at the kW scale with a 10 Nm3/h productivity per module. The primary challenge with AEMWE technology is develop a suitable anion exchange membrane with ohmic resistance, gas permeability, and long-term stability simliar to that of the membrane used for PEMWE. Additionally, the use of expensive porous transport layers (PTL) and/or complex flow field designs increases both PEMWE and AEMWE system cost relative to AWE. 12PDF Image | sustainable production of fuels and chemicals
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