Formation of unexpectedly active Ni–Fe oxygen evolution electrocatalysts by physically mixing Ni and Fe oxyhydroxides

Abstract

Physically mixing distinct Ni(OH)2and Fe(OOH) particles leads to formation of highly active “physically mixed” Ni + Fe catalysts with atomically intermixed Ni–(O)–Fe sites.

Spectroelectrochemical study of water oxidation on nickel and iron oxyhydroxide electrocatalysts

“…However, the Fe concentration at which the favoured MOOH(++) species accumulated switches from Ni-centred to Fe-centred remains to be determined. It also cannot be ascertained from these data alone whether a regime exists in which both metals are responsible for charge accumulation, as reported by others 30,32,54 . A degree of synergism between metal centres is probable, considering the improved charge accumulation found in the FeOOHNiOOH sample over the FeOOH sample.…”

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

“…[48][49][50][51] Indeed, simple physical mixing of Ni(OH) 2 and Fe(OOH) leads to atomically intermixed Ni-Fe catalysts with unexpectedly high OER activity. 52 Xu and co-workers investigated NiCoO x -based catalysts in AEM electrolysis and found excellent performance that was further improved by adding Fe species to the particle surface. 53 3.1.2.2 Other PGM-free-based OER catalysts.…”

Investigation of the stability of NiFe-(oxy)hydroxide anodes in alkaline water electrolysis under industrially relevant conditions

“…[21][22][23][24] Recent findings have pointed to the formation of mixed phase in which bridging Ni-O-Fe motifs are responsible for the enhanced catalytic activity. 25 Although the exact role of Fe is still debated, various synthetic strategies were developed to maximize the catalytic performance. 18 Despite the efforts made to enhance the activity and to understand the role of Fe in NiFe-(oxy)hydroxide, the stability aspect of this material has not been extensively studied yet.…”