Phase controlled synthesis of transition metal carbide nanocrystals by ultrafast flash Joule heating
Journal Article
·
· Nature Communications
- Rice Univ., Houston, TX (United States); Rice University
- Rice Univ., Houston, TX (United States)
- Rice Univ., Houston, TX (United States); Corban Univ., Salem, OR (United States)
Nanoscale carbides enhance ultra-strong ceramics and show activity as high-performance catalysts. Traditional lengthy carburization methods for carbide syntheses usually result in coked surface, large particle size, and uncontrolled phase. Here, a flash Joule heating process is developed for ultrafast synthesis of carbide nanocrystals within 1 s. Various interstitial transition metal carbides (TiC, ZrC, HfC, VC, NbC, TaC, Cr2C3, MoC, and W2C) and covalent carbides (B4C and SiC) are produced using low-cost precursors. By controlling pulse voltages, phase-pure molybdenum carbides including β-Mo2C and metastable α-MoC1-x and η-MoC1-x are selectively synthesized, demonstrating the excellent phase engineering ability of the flash Joule heating by broadly tunable energy input that can exceed 3000 K coupled with kinetically controlled ultrafast cooling (>104 K s–1). Theoretical calculation reveals carbon vacancies as the driving factor for topotactic transition of carbide phases. The phase-dependent hydrogen evolution capability of molybdenum carbides is investigated with β-Mo2C showing the best performance.
- Research Organization:
- Rice Univ., Houston, TX (United States)
- Sponsoring Organization:
- Air Force Office of Scientific Research; Office of Naval Research; U.S. Army Corps of Engineers; USDOE
- Grant/Contract Number:
- FE0031794
- OSTI ID:
- 1881501
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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