Understanding the Structural Evolution of IrFeCoNiCu High-Entropy Alloy Nanoparticles under the Acidic Oxygen Evolution Reaction.

Autor:	Maulana AL; Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, United States.; California Research Alliance (CARA), BASF Corporation, Berkeley, California 94720, United States., Chen PC; California Research Alliance (CARA), BASF Corporation, Berkeley, California 94720, United States.; Kavli Energy Nanoscience Institute, University of California, Berkeley, Berkeley, California 94720, United States.; Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States., Shi Z; Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14850, United States.; School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14850, United States., Yang Y; Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.; Miller Institute for Basic Research in Science, University of California, Berkeley, Berkeley, California 94720, United States., Lizandara-Pueyo C; California Research Alliance (CARA), BASF Corporation, Berkeley, California 94720, United States., Seeler F; BASF SE, 67056 Ludwigshafen am Rhein, Germany., Abruña HD; Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14850, United States., Muller D; School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14850, United States.; Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca 14850, New York United States., Schierle-Arndt K; BASF SE, 67056 Ludwigshafen am Rhein, Germany., Yang P; Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, United States.; California Research Alliance (CARA), BASF Corporation, Berkeley, California 94720, United States.; Kavli Energy Nanoscience Institute, University of California, Berkeley, Berkeley, California 94720, United States.; Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.
Jazyk:	angličtina
Zdroj:	Nano letters [Nano Lett] 2023 Jul 26; Vol. 23 (14), pp. 6637-6644. Date of Electronic Publication: 2023 Jul 05.
DOI:	10.1021/acs.nanolett.3c01831
Abstrakt:	High-entropy alloy (HEA) nanoparticles are promising catalyst candidates for the acidic oxygen evolution reaction (OER). Herein, we report the synthesis of IrFeCoNiCu-HEA nanoparticles on a carbon paper substrate via a microwave-assisted shock synthesis method. Under OER conditions in 0.1 M HClO 4 , the HEA nanoparticles exhibit excellent activity with an overpotential of ∼302 mV measured at 10 mA cm -2 and improved stability over 12 h of operation compared to the monometallic Ir counterpart. Importantly, an active Ir-rich shell layer with nanodomain features was observed to form on the surface of IrFeCoNiCu-HEA nanoparticles immediately after undergoing electrochemical activation, mainly due to the dissolution of the constituent 3d metals. The core of the particles was able to preserve the characteristic homogeneous single-phase HEA structure without significant phase separation or elemental segregation. This work illustrates that under acidic operating conditions, the near-surface structure of HEA nanoparticles is susceptible to a certain degree of structural dynamics.
Databáze:	MEDLINE
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