Dopant-Driven Positive Reinforcement in Ex-solution Process: New Strategy to Develop Highly Capable and Durable Catalytic Materials
- Title
- Dopant-Driven Positive Reinforcement in Ex-solution Process: New Strategy to Develop Highly Capable and Durable Catalytic Materials
- Author
- 김경학
- Keywords
- binary oxides; catalysts; host oxides; metal nanoparticles; phase transitions; ex-solution
- Issue Date
- 2020-10
- Publisher
- WILEY-V C H VERLAG GMBH
- Citation
- ADVANCED MATERIALS, v. 32, no. 46, article no. 2003983, page. 1-9
- Abstract
- The ex-solution phenomenon, a central platform for growing metal nanoparticles on the surface of host oxides in real time with high durability and a fine distribution, has recently been applied to various scientific and industrial fields, such as catalysis, sensing, and renewable energy. However, the high-temperature processing required for ex-solutions (>700 degrees C) limits the applicable material compositions and has hindered advances in this technique. Here, an unprecedented approach is reported for low-temperature particle ex-solution on important nanoscale binary oxides. WO(3)with a nanosheet structure is selected as the parent oxide, and Ir serves as the active metal species that produces the ex-solved metallic particles. Importantly, Ir doping facilitates a phase transition in the WO(3)bulk lattice, which further promotes Ir ex-solution at the oxide surface and eventually enables the formation of Ir particles (<3 nm) at temperatures as low as 300 degrees C. Low-temperature ex-solution effectively inhibits the agglomeration of WO(3)sheets while maintaining well-dispersed ex-solved particles. Furthermore, the Ir-decorated WO(3)sheets show excellent durability and H2S selectivity when used as sensing materials, suggesting that this is a generalizable synthetic strategy for preparing highly robust heterogeneous catalysts for a variety of applications.
- URI
- https://onlinelibrary.wiley.com/doi/10.1002/adma.202003983https://repository.hanyang.ac.kr/handle/20.500.11754/172069
- ISSN
- 0935-9648; 1521-4095
- DOI
- 10.1002/adma.202003983
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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