Creation of palladium gold alloy surfaces with catalytic activity

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04884
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 29020:Thin film/surface and interfacial physical properties-related
• Research Institution: Tokyo Denki University
• Principal Investigator: Ogura Shohei 東京電機大学, 工学部, 教授 (10396905)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 単原子合金触媒 / 水素

Outline of Final Research Achievements

The purpose of this study was to create atomically controlled non-equilibrium active sites on the surface of palladium-gold alloys using surface reconstruction by carbon monoxide adsorption and nonthermal desorption of adsorbed molecules by electron-beam irradiation, and to clarify their catalytic activity. Although the existence of non-equilibrium sites was not confirmed, desorption of carbon monoxide was observed upon electron-beam irradiation, indicating that non-equilibrium sites can be created by exploring the surface structure and electron-beam irradiation conditions. In addition, we developed a simulation program for thermal desorption spectra that takes into account the surface diffusion of adsorbed molecules, and obtained results that lead to the analysis of reaction mechanisms in systems where surface diffusion is involved in the reaction.

Free Research Field

表面界面物性

Academic Significance and Societal Importance of the Research Achievements

近年活発に研究が進められている単原子合金触媒は熱平衡の安定な表面構造のみに限られており，非平衡構造の触媒活性は未解明となっていた。本研究により非平衡構造を持つ新奇触媒の研究につながる結果が得られた。また表面拡散は触媒活性に大きな影響を与えていることが示唆されており、本研究の表面拡散を考慮した昇温脱離スペクトルのシミュレーションプログラムの開発により、表面拡散が反応に関わる系での反応メカニズムの解析が進むと期待される。