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Title: Ultrafast Preparation of Nonequilibrium FeNi Spinels by Magnetic Induction Heating for Unprecedented Oxygen Evolution Electrocatalysis

Journal Article · · Research
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [4];  [1]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [1]
  1. Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, USA
  2. Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
  3. Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, Illinois 62901, USA
  4. Department of Chemistry, Dalhousie University, 6274 Coburg Road, Halifax, NS, Canada, B3H 4R2

Carbon-supported nanocomposites are attracting particular attention as high-performance, low-cost electrocatalysts for electrochemical water splitting. These are mostly prepared by pyrolysis and hydrothermal procedures that are time-consuming (from hours to days) and typically difficult to produce a nonequilibrium phase. Herein, for the first time ever, we exploit magnetic induction heating-quenching for ultrafast production of carbon-FeNi spinel oxide nanocomposites (within seconds), which exhibit an unprecedentedly high performance towards oxygen evolution reaction (OER), with an ultralow overpotential of only +260 mV to reach the high current density of 100 mA cm -2 . Experimental and theoretical studies show that the rapid heating and quenching process (ca. 10 3 K s -1 ) impedes the Ni and Fe phase segregation and produces a Cl-rich surface, both contributing to the remarkable catalytic activity. Results from this study highlight the unique advantage of ultrafast heating/quenching in the structural engineering of functional nanocomposites to achieve high electrocatalytic performance towards important electrochemical reactions.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357; SC0012704
OSTI ID:
1909275
Journal Information:
Research, Journal Name: Research Vol. 2022; ISSN 2639-5274
Publisher:
American Association for the Advancement of Science (AAAS)Copyright Statement
Country of Publication:
United States
Language:
English

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