期刊
NANO LETTERS
卷 16, 期 3, 页码 1650-1656出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b04506
关键词
Hot electron; catalytic nanodiodes; graphene; TiO2; Schottky junction and Pt nanoparticles
类别
资金
- Creative Research Program of ETRI of Korea [16ZE1110]
- [IBS-R004-G4]
Direct detection of hot electrons generated by exothermic surface reactions on nanocatalysts is an effective strategy to obtain insight into electronic excitation during chemical reactions. For this purpose, we fabricated a novel catalytic nanodiode based on a Schottky junction between a single layer of graphene and an n-type TiO2 layer that enables the detection of hot electron flows produced by hydrogen oxidation on Pt nanoparticles. By making a comparative analysis of data obtained from measuring the hot electron current (chemicurrent) and turnover frequency, we demonstrate that graphene's unique electronic structure and extraordinary material properties, including its atomically thin nature and ballistic electron transport, allow improved conductivity at the interface between the catalytic Pt nanoparticles and the support. Thereby, graphene-based nanodiodes offer an effective and facile way to approach the study of chemical energy conversion mechanisms in composite catalysts with carbon-based supports.
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