Recent trends in hydrogen and oxygen electrocatalysis for anion exchange membrane technologies

Abstract

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Recent Advances in Electrocatalysts for Proton Exchange Membrane Fuel Cells and Alkaline Membrane Fuel Cells

“…A visual scheme of dissociative and associative mechanisms for ORR is illustrated in a previous literature, [128] and more detailed ORR reaction pathways and mechanisms on different catalyst surfaces (Pt-based, metal-free and nonprecious metal-based) were discussed in a recently published review. [129] However, the detailed reaction mechanism remains controversial, requiring further corroborations in future. [128,130] Meanwhile, there is a general consensus that the first electron transfer to the adsorbed O 2 to form superoxide anion (O 2…”

Constructing dual active sites for synergistic electrocatalysis of hydrogen oxidation: single-metal-atoms anchored on WC2O2 MXene

“…3 Many efforts have been devoted to exploring economical electrocatalysts. 4 Some low-cost catalysts (such as Ag 5 and Fe–N–C type catalysts 6 ) have been proven as excellent substitutes for Pt-based ORR cathodes. 7 However, the efficient HOR catalysts at the anode turned out to be a harder nut to crack.…”

Recent developments on transition metal–based electrocatalysts for application in anion exchange membrane water electrolysis

“…They are utilized as catalysts in the form of mixed-metal alloys, phosphate, chalcogenides, oxides, nitrides, and carbides and as composites/hybrids, which favors HER, OER, and even bifunctional water splitting in mild alkaline. [7][8][9][10] Past reviews have highlighted the active kinetics, excellent catalytic performance, and good stability of these transition metal catalysts in mild alkaline. For instance, Ni-and Co-based HER active catalysts with low overpotentials are competitive with the Pt/C.…”