Graphene-Semiconductor Catalytic Nanodiodes for Quantitative Detection of Hot Electrons Induced by a Chemical Reaction

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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
Publisher
AMER CHEMICAL SOC
Issue Date
2016-03
Language
English
Article Type
Article
Keywords

METAL-OXIDE INTERFACES; CO OXIDATION; METHANOL OXIDATION; SURFACE-CHEMISTRY; SCHOTTKY DIODES; NANOPARTICLES; FLOW; SIZE; SELECTIVITY; DYNAMICS

Citation

NANO LETTERS, v.16, no.3, pp.1650 - 1656

ISSN
1530-6984
DOI
10.1021/acs.nanolett.5b04506
URI
http://hdl.handle.net/10203/208483
Appears in Collection
EEW-Journal Papers(저널논문)
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