Precious Metal-Free Nickel Nitride Catalyst for the Oxygen Reduction Reaction.

Autor: Kreider ME; Department of Chemical Engineering , Stanford University , 443 Via Ortega , Stanford , California 94305 , United States., Gallo A; Department of Chemical Engineering , Stanford University , 443 Via Ortega , Stanford , California 94305 , United States., Back S; Department of Chemical Engineering , Stanford University , 443 Via Ortega , Stanford , California 94305 , United States.; Department of Chemical Engineering , Carnegie Mellon University , Pittsburgh , Pennsylvania 15213 , United States., Liu Y; Department of Materials Science and Engineering , Stanford University , 496 Lomita Mall , Stanford , California 94305 , United States., Siahrostami S; Department of Chemical Engineering , Stanford University , 443 Via Ortega , Stanford , California 94305 , United States.; Department of Chemistry , University of Calgary , 2500 University Drive NW , Calgary , Alberta T2N 1N4 , Canada., Nordlund D, Sinclair R; Department of Materials Science and Engineering , Stanford University , 496 Lomita Mall , Stanford , California 94305 , United States., Nørskov JK; Department of Chemical Engineering , Stanford University , 443 Via Ortega , Stanford , California 94305 , United States.; Technical University of Denmark , Lyngby DK-2800 , Denmark., King LA; Department of Chemical Engineering , Stanford University , 443 Via Ortega , Stanford , California 94305 , United States., Jaramillo TF; Department of Chemical Engineering , Stanford University , 443 Via Ortega , Stanford , California 94305 , United States.
Jazyk: angličtina
Zdroj: ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2019 Jul 31; Vol. 11 (30), pp. 26863-26871. Date of Electronic Publication: 2019 Jul 16.
DOI: 10.1021/acsami.9b07116
Abstrakt: With promising activity and stability for the oxygen reduction reaction (ORR), transition metal nitrides are an interesting class of non-platinum group catalysts for polymer electrolyte membrane fuel cells. Here, we report an active thin-film nickel nitride catalyst synthesized through a reactive sputtering method. In rotating disk electrode testing in a 0.1 M HClO 4 electrolyte, the crystalline nickel nitride film achieved high activity and selectivity to four-electron ORR. It also exhibited good stability during 10 and 40 h chronoamperometry measurements in acid and alkaline electrolyte, respectively. A combined experiment-theory approach, with detailed ex situ materials characterization and density functional theory calculations, provides insight into the structure of the catalyst and its surface during catalysis. Design strategies for activity and stability improvement through alloying and nanostructuring are discussed.
Databáze: MEDLINE
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