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• W4210444878 abstract "Hydrogen fuel cells have attracted growing attention for high-performance automotive power but are hindered by the scarcity of platinum (and other precious metals) used to catalyze the sluggish oxygen reduction reaction (ORR). We report on a family of nonprecious transition metal nitrides (TMNs) as ORR electrocatalysts in alkaline medium. The air-exposed nitrides spontaneously form a several-nanometer-thick oxide shell on the conductive nitride core, serving as a highly active catalyst architecture. The most active catalyst, carbon-supported cobalt nitride (Co3N/C), exhibited a half-wave potential of 0.862 V and achieved a record-high peak power density among reported nitride cathode catalysts of 700 mW cm-2 in alkaline membrane electrode assemblies. Operando x-ray absorption spectroscopy studies revealed that Co3N/C remains stable below 1.0 V but experiences irreversible oxidation at higher potentials. This work provides a comprehensive analysis of nonprecious TMNs as ORR electrocatalysts and will help inform future design of TMNs for alkaline fuel cells and other energy applications." @default.
• W4210444878 created "2022-02-08" @default.
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• W4210444878 date "2022-02-04" @default.
• W4210444878 modified "2023-10-14" @default.
• W4210444878 title "Nonprecious transition metal nitrides as efficient oxygen reduction electrocatalysts for alkaline fuel cells" @default.
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• W4210444878 doi "https://doi.org/10.1126/sciadv.abj1584" @default.
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