Alkaline water electrolysis facilitated via non-precious monometallic catalysts combined with highly KOH doped polybenzimidazole membrane

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

“…Dilute carbonate or bicarbonate solutions have a mildly alkaline pH (10-12) that retains sufficient ionic conductivity. V using the CCM 57,59,106,107,114,116,[131][132][133][134][135][136][139][140][141] or CCS 22,54,55,95,[101][102][103][104]108,109,[111][112][113]115,[117][118][119][120][121][122][123][124][126][127][128][129]142,143 method of MEA construction. Additionally, such conditions should provide enhanced stability of cell materials as well as the polymeric AEM/binders.…”

“…The importance of the AEM binder has been highlighted in the literature. Current density (<15 mA cm À2 at 1.8 V) with no, 115,124,142 or inert binder (e.g. PTFE).…”

“…Fig. 8 Comparison of the current densities achieved at cell voltage 1.8 V using water, 22,55,57,107,108,114,115,118,120,124,129,[132][133][134][135][136][139][140][141][142] (bi)carbonates 54,55,96,106,114,116,122,141,143,151 or hydroxides 55,59,93,95,[101][102][103][104]109,[111][112][113][114][117][118][119]121,123,124,[126]…”

“…Another interesting feature is, that the V-I load curves, are usually obtained in the temperature range of 80 to 90 C, 55,113,142 while the LTE experiments are typically carried on at temperatures below 60 C. 122,126 It clearly indicates the poor stability of performance at higher temperatures. It is thus possible to conclude, that short-term performance gures have to be considered carefully, as they oen are performed outside the long-term stability conditions window.…”

Partially fluorinated copolymers containing pendant piperidinium head groups as anion exchange membranes for alkaline fuel cells

“…[3][4][5] Under alkaline conditions, non-precious metal catalysts such as Ni and Co are potentially available. 6,7 Other benets include depressed fuel crossover due to reversed ion transport, better catalyst stability, and faster oxygen reduction reaction. 8 However, there are some inherent drawbacks to AEMFCs that obstruct their general applicability including relatively low conductivity of hydroxide ion compared to proton and low stability of AEMs under alkaline conditions.…”