Pulsed Light Synthesis of High Entropy Nanocatalysts with Enhanced Catalytic Activity and Prolonged Stability for Oxygen Evolution Reaction
[1];
[6]
- Department of Nuclear Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
- Department of Aerospace and Mechanical Engineering University of Notre Dame Notre Dame IN 46556 USA
- Department of Aerospace and Mechanical Engineering University of Notre Dame Notre Dame IN 46556 USA, Department of Chemical Engineering Texas Tech University Lubbock Texas 79409 USA
- Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
- Department of Nuclear Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA, Honda Research Institute USA, Inc. San Jose CA 95134 USA
- Department of Nuclear Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA, Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
Abstract The ability to synthesize compositionally complex nanostructures rapidly is a key to high‐throughput functional materials discovery. In addition to being time‐consuming, a majority of conventional materials synthesis processes closely follow thermodynamics equilibria, which limit the discovery of new classes of metastable phases such as high entropy oxides (HEO). Herein, a photonic flash synthesis of HEO nanoparticles at timescales of milliseconds is demonstrated. By leveraging the abrupt heating and cooling cycles induced by a high‐power‐density xenon pulsed light, mixed transition metal salt precursors undergo rapid chemical transformations. Hence, nanoparticles form within milliseconds with a strong affinity to bind to the carbon substrate. Oxygen evolution reaction (OER) activity measurements of the synthesized nanoparticles demonstrate two orders of magnitude prolonged stability at high current densities, without noticeable decay in performance, compared to commercial IrO 2 catalyst. This superior catalytic activity originates from the synergistic effect of different alloying elements mixed at a high entropic state. It is found that Cr addition influences surface activity the most by promoting higher oxidation states, favoring optimal interaction with OER intermediates. The proposed high‐throughput method opens new pathways toward developing next‐generation functional materials for various electronics, sensing, and environmental applications, in addition to renewable energy conversion.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Hydrogen in Energy and Information Sciences (HEISs)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- NE0008812; SC0023450
- OSTI ID:
- 1971284
- Journal Information:
- Advanced Science, Journal Name: Advanced Science Journal Issue: 18 Vol. 10; ISSN 2198-3844
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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