期刊
ACS NANO
卷 6, 期 10, 页码 9258-9266出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn3037286
关键词
photoelectrochemistry; electrochemical switching; quantum dots; switch; photosystem; photocurrent; modified electrode
类别
资金
- NanoSensoMach ERC Advanced Grant [267574]
- European Research Council (ERC) [267574] Funding Source: European Research Council (ERC)
Photoactive inorganic CdS quantum dots (QDs) or the native photosystem I (PSI) is immobilized onto a pyrroloquinoline quinone (PQQ) monolayer linked to Au electrodes to yield hybrid relay/QDs (or photosystem) assemblies. By the electrochemical biasing of the electrode potential, the relay units are retained in their oxidized PQQ or reduced PQQH(2) states. The oxidized or reduced states of the relay units dictate the direction of the photocurrent (anodic or cathodic). By the cyclic biasing of the electrode potential between the values E >= - 0.05 V and E <= -0.3 V vs Ag quasi-reference electrode (Ag QRE), retaining the relay units In the oxidized PQQ or reduced PQQH2 states, the photocurrents are respectively switched between anodic and cathodic values. Different configurations of electrically switchable photoelectrochemical systems are described: (i) the PQQ/CdS QDs/(triethanolamine, TEOA) or PQQ/PSI/(ascorbic acid/dichlorophenolindophenol, DCPIP) systems, leading to anodic photocurrents; (ii) the PQQ/CdS QDs (or PSI)/(flavin adenine dinucleotide) systems, leading to cathodic photocurrents; (iii) the PQQ/CdS Os (or PSI)/(O-2) switchable systems, leading to cyclic anodic/cathodic switching of the photoairrents.
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