113學年材料所-第十三週 專題研討課程 演講公告 (113年12月05日)
2024.11.28
題目: A Library of High-Entropy-Alloy Nanocrystals with Controlled Facets for Catalysis
演講者: 楊東翰 副教授
現職: 國立清華大學 化學工程學系 副教授
時間: 113年12月05日(四) 下午15:10~17:00
地點: 成功大學成功校區三系館 鋼構區(3F)共同教室A1302演講廳
演講摘要:
High-entropy-alloy (HEA) nanocrystals, composed of at least five metallic elements, have emerged as highly versatile catalysts due to their vast chemical diversity and tunability. However, effective methods for synthesizing HEA nanocrystals with controlled surface atomic structures have been lacking, limiting their potential to enhance catalytic performance. In this talk, I will introduce a straightforward yet robust strategy for creating a library of facet-controlled HEA nanocrystals, incorporating up to ten distinct metallic elements. Utilizing a solution-phase, layer-by-layer epitaxial growth method, we have designed 638 unique catalysts, each consisting of between 5 to 10 elements. This technique enables the deposition of subnanometer-thick HEA atomic layers on nanocrystal seeds with {100} and {111} facets, resulting in HEA shells with square and hexagonal atomic arrangements, respectively. Our approach has identified three distinct facet-dependent catalytic activities of these HEA nanocrystals in both electrocatalysis and photocatalysis, using in situ synchrotron X-ray absorption spectroscopy and density-functional theory calculations. This work pioneers facet engineering within the multi-elemental space, addressing critical needs for the future development of HEA nanocrystals in catalysis.
歡迎各位撥冗參加!!
演講者: 楊東翰 副教授
現職: 國立清華大學 化學工程學系 副教授
時間: 113年12月05日(四) 下午15:10~17:00
地點: 成功大學成功校區三系館 鋼構區(3F)共同教室A1302演講廳
演講摘要:
High-entropy-alloy (HEA) nanocrystals, composed of at least five metallic elements, have emerged as highly versatile catalysts due to their vast chemical diversity and tunability. However, effective methods for synthesizing HEA nanocrystals with controlled surface atomic structures have been lacking, limiting their potential to enhance catalytic performance. In this talk, I will introduce a straightforward yet robust strategy for creating a library of facet-controlled HEA nanocrystals, incorporating up to ten distinct metallic elements. Utilizing a solution-phase, layer-by-layer epitaxial growth method, we have designed 638 unique catalysts, each consisting of between 5 to 10 elements. This technique enables the deposition of subnanometer-thick HEA atomic layers on nanocrystal seeds with {100} and {111} facets, resulting in HEA shells with square and hexagonal atomic arrangements, respectively. Our approach has identified three distinct facet-dependent catalytic activities of these HEA nanocrystals in both electrocatalysis and photocatalysis, using in situ synchrotron X-ray absorption spectroscopy and density-functional theory calculations. This work pioneers facet engineering within the multi-elemental space, addressing critical needs for the future development of HEA nanocrystals in catalysis.
歡迎各位撥冗參加!!