期刊
NANO ENERGY
卷 13, 期 -, 页码 258-266出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2015.02.013
关键词
Graphene; Futlerene (C-60); Photoetectrochemical; Zno quantum dots
类别
资金
- NRF of Korea Grant - Ministry of Science, ICT and Future Planning [NRF-2013R1A2A1A09014038, 2009-0083540]
- Global Ph. D Fellowship Program through the NRF [2012H1A2A1016034]
- KIST Institution Program
- R&D Convergence Program of MSIP (Ministry of Science, ICT and Future Planning)
- ISTK (Korea Research Council for Industrial Science and Technology) of Republic of Korea [CAP-13-2-ETRI]
- Global Frontier Program through the Global Frontier Hybrid Interface Materials (GFHIM) of the National Research Foundation of Korea(NRF) - Ministry of Science, ICT & Future Planning [2013M3A6B1078867]
- National Research Foundation of Korea [2013M3A6B1078867, 2012H1A2A1016034] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A conformal coating strategy with nanocarbon to enhance photoelectrochemical responses and the long-term stability of ZnO quantum dots is described. Strong anchoring bonds between a ZnO core and nanocarbon shell ameliorate the poor electrochemical stability of ZnO (such as photocorrosion) in liquid electrolyte. The conjugation of the graphene QD and C-60 to the ZnO QDs leads to 71% and 99% quenching of the UV photoluminescence (PL) emission, respectively. Also, the decay time of the nanocomposites at UV wavelengths measured much faster than that for the reference of bare ZnO QDs. The moderate energy states and good charge conductance of the nanocarbons result in ultrafast charge transport from the ZnO core to the nanocarbon shell. Thereby, the ZnO core-nanocarbon shell quantum dots shows significantly improved light harvesting performance. The PEC cell test for water oxidation and conventional degradation test using organic dyes exhibited that the photoelectrochemical activities could be significantly improved. At 1.23 V (vs. RHE) in pH 6.9 electrolyte, 6 times enhanced photocurrent density was achieved by the conformal coating with C60 (0.235 mA/cm(2) for ZnO-C-60 photoanodes). In particular, the strong Zn-O-C bond structures on the ZnO surface prevented photoinduced holes from being consumed by the photocorrosion reaction of ZnO, thereby improving long-term stability. (C) 2015 Elsevier Ltd. All rights reserved.
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