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Publisher DOI: 10.1021/acsnano.0c09776
Title: Direct and broadband plasmonic charge transfer to enhance water oxidation on a gold electrode
Language: English
Authors: Graf, Matthias 
Vonbun-Feldbauer, Gregor  
Koper, Marc T. M. 
Keywords: Chemical interface damping;Density functional theory;Hot electron;Hot hole;Nanoporous gold;Photoelectrocatalysis;Surface-enhanced Raman spectroscopy
Issue Date: 23-Feb-2021
Publisher: American Chemical Society
Source: ACS Nano 15 (2): 3188-3200 (2021-02-23)
Journal: ACS nano 
Abstract (english): 
Plasmonic photocatalysis via hot charge carriers suffers from their short lifetime compared with the sluggish kinetics of most reactions. To increase lifetime, adsorbates on the surface of a plasmonic metal may create preferential states for electrons to be excited from. We demonstrate this effect with O adsorbates on a nanoporous gold electrode. Nanoporous gold is used to obtain a broadband optical response, to increase the obtained photocurrent, and to provide a SERS-active substrate. Only with adsorbates present, we observe significant photocurrents. Illumination also increases the adsorbate coverage above its dark potential-dependent equilibrium, as derived from a two-laser in situ SERS approach. Density functional theory calculations confirm the appearance of excitable states below the Fermi level. The photocurrent enhancement and broadband characteristics reveal the potential of the plasmonic approach to improve the efficiency of photoelectrochemical water splitting.
DOI: 10.15480/882.3462
ISSN: 1936-0851
Institute: Keramische Hochleistungswerkstoffe M-9 
Document Type: Article
Funded by: Deutsche Forschungsgemeinschaft (DFG) 
Project: SFB 986: Teilprojekt A4 - Ab-initio basierende Modellierung und Beeinflussung der mechanischen Eigenschaften von Hybridgrenzflächen 
SFB 986: Teilprojekt B10 - Funktionalisierung von hierarchischen nanoporösen Metallen durch aktive organische Filme 
SFB 986: Teilprojekt C9 - Lochemission aus anpassbaren metallischen Metamaterialien 
License: CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives) CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)
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