1. A Joule-heating-derived multiphase porous TiO2 support for reinforcing high-entropy alloy catalysts.
- Author
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Park, Seyeon, Woo, Sungyoon, Kim, Jina, Lee, Jaewoong, Lee, Hyunji, Kim, Kyung-min, Ahn, Jaewan, Kim, Hyun-Tak, Kim, Young Jin, Kim, Jihan, Kim, Il-Doo, and Kim, Sang-Joon
- Subjects
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HEAT pulses , *TITANIUM dioxide , *THERMAL shock , *ALLOYS , *CATALYSTS , *NANOCRYSTALS , *HETEROGENEOUS catalysts , *CATALYST supports - Abstract
Single-crystal nanocrystals of catalytic metals and oxides are essential for understanding chemical interactions on well-defined catalyst surfaces. However, a comprehensive understanding of the crystallographic origins for such enhancement has been lacking. This work provides formal evidence of the structure–property relationship through a model study on single-crystal TiO 2. Our approach involves transient pulse heating to manipulate porosity and phase in epitaxially-grown TiO 2 nanosheets along the (0 0 1) plane. Furthermore, we could introduce high-entropy alloy nanoparticles into the system, which exhibited excellent catalytic activity toward CO oxidation, achieving T 90 at 143 °C. This improved performance is attributed to the interplay between the catalytic nanoparticles and the multiphase support, facilitating CO and O 2 adsorption. Our study contributes to a fundamental understanding of structure–property relationships in heterogeneous catalyst systems. Overall, our thermal shock synthesis approach shows much promise for developing single crystal-based advanced nanocatalysts with broad practical implications. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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