Flash-Thermal Shock Synthesis of High-Entropy Alloys Toward High-Performance Water Splitting
- Authors
- Cha, Jun-Hwe; Cho, Su-Ho; Kim, Dong-Ha; Jeon, Dogyeong; Park, Seohak; Jung, Ji-Won; Kim, Il-Doo; Choi, Sung-Yool
- Issue Date
- Nov-2023
- Publisher
- WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
- Keywords
- ambient air; high-entropy alloys; high-throughput processes; photothermal effects; water splitting
- Citation
- Advanced Materials, v.35, no.46, pp 1 - 10
- Pages
- 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- Advanced Materials
- Volume
- 35
- Number
- 46
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/117758
- DOI
- 10.1002/adma.202305222
- ISSN
- 0935-9648
1521-4095
- Abstract
- High-entropy alloys (HEAs) provide unprecedented physicochemical properties over unary nanoparticles (NPs). According to the conventional alloying guideline (Hume–Rothery rule), however, only size-and-structure similar elements can be mixed, limiting the possible combinations of alloying elements. Recently, it has been reported that based on carbon thermal shocks (CTS) in a vacuum atmosphere at high temperature, ultrafast heating/cooling rates and high-entropy environment play a critical role in the synthesis of HEAs, ruling out the possibility of phase separation. Since the CTS requires conducting supports, the Joule-heating efficiencies rely on the carbon qualities, featuring difficulties in uniform heating along the large area. This work proposes a photo-thermal approach as an alternative and innovative synthetic method that is compatible with ambient air, large-area, remote process, and free of materials selection. Single flash irradiation on carbon nanofibers induced momentary high-temperature annealing (>1800 °C within 20 ms duration, and ramping/cooling rates >104 K s−1) to successfully decorate HEA NPs up to nine elements with excellent compatibility for large-scale synthesis (6.0 × 6.0 cm2 of carbon nanofiber paper). To demonstrate their feasibility toward applications, senary HEA NPs (PtIrFeNiCoCe) are designed and screened, showing high activity (ηoverall = 777 mV) and excellent stability (>5000 cycles) at the water splitting, including hydrogen evolution reactions and oxygen evolution reactions. © 2023 Wiley-VCH GmbH.
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