Characterisation and processing of aqueous LaNi0.6Fe0.4O3 Suspensions into Porous Electrode Layers for Alkaline Water Electrolysis

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

“…For Co and Mo-oxide electrocatalysts on Ni foam-based gas diffusion electrodes, extraordinary current densities of 1100 mA·cm –2 and 2300 mA·cm –2 were obtained with voltages of 1.5 and 1.75 V, respectively, at 250 °C, whereas strong serial and polarization resistance increases were induced by the extremely rapid oxidation of the anode and the current collector . Therefore, studies concentrating on various perovskite materials have been conducted for enhanced resistance in hot alkaline media. , According to the electrochemical activity assessments of LaNiO 3 , La 0.97 NiO 3 , LaNi 0.6 Fe 0.4 O 3 , La 0.97 Ni 0.6 Fe 0.4 O 3 and La 2 Ni 0.9 Fe 0.1 O 4 in a 31 wt % KOH solution at 100 °C and a 45 wt % KOH solution at 220 °C, unsuitability to the OER at temperature over 100 °C was indicated since partial decomposition was observed for all materials after 1 week of exposure to 220 °C. Although no research concerning the application of chalcogenide materials at temperature higher than 100 °C has been performed to the best of our knowledge, this class of electrocatalysts has great potential for large-scale employment due to their abundance and low cost.…”

“…When HER and OER decoupling agents are concurrently utilized, cathodic and anodic electrolytes are constantly circulated between electrolysis cells to be reduced or oxidized, and external catalysis beds to be converted into their initial states. Dual-circuit decoupled alkaline electrolysis systems employing 7,8-dihydroxy-2-phenazinessulfonic acid (DHPS)/DHPS-2H and [Fe­(CN) 6 ] 4– /[Fe­(CN) 6 ] − …”

“…Based on the multiple reversible redox reactions, phosphotungstic acid [P 2 W 18 O 62 ] (6+ n )– (0 ≤ n ≤ 18) exhibited a capacity to store up to 18 electrons and protons according to practical concentrations, which allowed a facile HER by simply diluting the solution . A strategy for tuning the redox property of ECPB was also presented by substituting the heteroatom to generate [ZnW 12 O 40 ]. − …”