High-performance anion-exchange membrane water electrolysis

Green hydrogen from anion exchange membrane water electrolysis: a review of recent developments in critical materials and operating conditions

“…116 Subsequently, if the PGM-free cathode catalyst (CeO 2 -La 2 O 3 ) was replaced by Pt (1.7 mg Pt cm À2 ) the performance of the AWE increased from 40 mA cm À2 to 300 mA cm À2 at 1.8 V cell voltage. 114,116 Direct comparison of the CCS and CCM approaches was provided by Park et al 135 Better performance was in this case achieved using CCM approach (500 mA cm À2 at 1.8 V) when compare to CCS approach (210 mA cm À2 under identical conditions). The explanation given by the authors was due to negative effects of the CCS preparation method on the structure of the catalyst layer increasing mass transport losses demonstrated by electrochemical impedance spectroscopy analysis of the system.…”

“…The most commonly applied method of CCM-MEA preparation is spray coating of a catalyst ink onto the surface of the polymer anion-selective membrane. [131][132][133][134][135][136] Recently, Ito et al compared the performance of CCM-MEAs prepared by spraying and doctor blade method. Better results were achieved using the spraying technique.…”

“…It is because of the hot-pressing step it includes. Anion-selective polymer membranes suffer from chemical instability when exposed to elevated temperatures, 135,138 which precludes catalyst transfer under high temperature conditions.…”

The Performance of Nickel and Nickel-Iron Catalysts Evaluated As Anodes in Anion Exchange Membrane Water Electrolysis

“…As shown in Figure 8a,b, polarization curves in 1 M KOH show a significantly higher performance and lower overpotential for OER than those taken in 0.1 M KOH. Achieving current densities of 2 A cm −2 at cell voltages of 1.85-1.9 V in 1 M KOH at 50 • C, may be regarded as an excellent result, considering the non-noble metal nature of these catalysts [2,8]. In 1 M KOH, the Ni and Ni 90 Fe 10 electrodes show similar performance to the benchmark at only twice the intended metallic loading (6 mg cm −2 versus 3 mg cm −2 for Ir-black).…”

“…As such, the development of active non-noble metal catalysts is crucial to further develop and establish AEMWE technology. The number of studies addressing performance improvements through the development of new AEM materials, catalysts and membrane electrode assemblies (MEAs) have increased in recent years [4][5][6][7][8][9][10][11][12][13]. However, the water splitting performance reported for AEMWE is still lower than that of PEMWE [14,15], particularly when employing non-noble metal catalysts and lower concentrations of alkaline solutions, or water [16].…”