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在电化学催化的应用研究中,至关重要的课题之一,莫过于寻找和制备高性能电催化剂.以碳或氧化物为载体,在其表面上沉积催化物质,可显著提高催化剂的利用率,降低成本.铂的催化活性较高,因此,对载体上沉积铂制备实用型电催化剂的研究一直受到重视.近十多年来,以原子排列结构明确的铂单晶面作为模型催化剂的研究取得了极大的进展,发现铂电极表面结构对其活性具有决定性的影响.从而可能通过获得的知识在原子和分子层次上对电催化剂表面进行设计和筛选.由于金属在一定条件下存在单晶多定向,以及多晶单定向的趋势,上述可能性就更接近实际.本文通过对玻碳表面沉积的高分散铂黑电催化剂的结构和对甲醇氧化的催化活性的研究,试图在微观层次上对实用型电催化剂表面结构及性能进行探讨.
One of the most important issues in the application of electrochemical catalysis is to look for and prepare high performance electrocatalysts.Carbon or oxide as the carrier, the deposition of catalytic material on its surface, can significantly improve the catalyst utilization , Reducing the cost of platinum catalytic activity is high, therefore, the preparation of the substrate deposited on platinum preparation of practical electrocatalysts has been paid attention to the past decade, the atomic structure of a clear platinum single crystal surface as a model catalyst Great progress has been made and it has been found that the surface structure of the platinum electrode has a decisive influence on its activity and it is therefore possible to design and screen the surface of the electrocatalyst at the atomic and molecular levels by means of the knowledge gained.As a result of the existence of single crystals Multi-orientation and polycrystalline orientation, the above-mentioned possibility is more realistic.Through the study on the structure of highly dispersed Pt-black electrocatalyst deposited on glassy carbon surface and the catalytic activity of methanol oxidation, The structure and performance of practical electrocatalysts are discussed.