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Frontiers of Optoelectronics

Front. Optoelectron.    2015, Vol. 8 Issue (2) : 220-228     DOI: 10.1007/s12200-015-0490-2
Optimised synthesis of close packed ZnO cloth and its applications in Li-ion batteries and dye-sensitized solar cells
Yue QIAN(),Rong LIU,Xiujuan JIN,Bin LIU,Xianfu WANG,Jin XU,Zhuoran WANG,Gui CHEN,Junfeng CHAO
Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan 430074, China
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Close packed ZnO nanoparticles on carbon cloth were synthesized by repeating a facile hydrothermal route in this study. After characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), the obtained ZnO cloth was further studied for the applications in lithium (Li)-ion batteries (LIBs) and dye-sensitized solar cells (DSSCs). When ZnO cloth annealed at 400°C for 2 h were used as anodes of LIBs, it exhibited high capacity of 600 mAh/g and outstanding cycling capability without significant fading after 130 cycles. Moreover, it was also found that our electrodes displayed good stabilities under various humidity and temperature. Furthermore, the obtained composites were calcined at higher temperature (800°C) to remove carbon and white pure ZnO cloth was formed. We transferred the as-formed ZnO cloth to?fluorine-doped tin oxide (FTO) substrate to make DSSCs, exhibiting an improved efficiency of around 0.38% assisted by TiCl4 treatment.

Keywords lithium-ion batteries (LIBs)      dye-sensitized solar cells (DSSCs)      ZnO nanoparticles      carbon cloth      facile hydrothermal route     
Corresponding Authors: Yue QIAN   
Just Accepted Date: 15 May 2015   Online First Date: 28 May 2015    Issue Date: 24 June 2015
 Cite this article:   
Yue QIAN,Rong LIU,Xiujuan JIN, et al. Optimised synthesis of close packed ZnO cloth and its applications in Li-ion batteries and dye-sensitized solar cells[J]. Front. Optoelectron., 2015, 8(2): 220-228.
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Rong LIU
Xiujuan JIN
Xianfu WANG
Jin XU
Zhuoran WANG
Junfeng CHAO
Fig.1  Schematic structure of ZnO cloth based DSSCs
Fig.2  (a) XRPD patterns of ZnO products at various annealing temperature; (b) and (c) SEM images of ZnO@C cloth annealed at 400°C for 2 h; (d) and (e) SEM images of ZnO cloth calcined at 800°C for 5 h; (f) ZnO cloth photo
Fig.3  Electrochemical characterization of ZnO-based half cells at the potential range from 0 to 3 V. (a) CV curves at a scan rate of 0.5 mV/s for the initial three cycles; (b) discharge-charge curves at the current density of 200 mA/g; (c) cycling performance at current density of 200 mA/g; (d) rate capacities at various current densities
Fig.4  Cycle performance of the battery (a) in different relative humidity (RH) at 20°C with a current density 200 mA/g; (b) in various temperatures at a constant humidity of 50% under the current density of 200 mA/g
Fig.5  (a) Impedance plots of ZnO at different cycling stages; (b) equivalent circuit model of the studied system.Z′: real part of impedance; Z′′: image part of impedance; Zw: Warburg impedance
sample Rs Rf CPE1 Rct
fresh 0.699 6.71 3.11E-5 0.719 36.41
after 50 cycles 1.281 7.03 2.44E-5 0.763 63.29
Tab.1  Fitting results of Nyquist plots using the equivalent circuit
Fig.6  (a) Photocurrent-voltage curve of DSSCs based on ZnO cloth with and without TiCl4 post-treatment under AM 1.5 solar simulator; (b) IPCE spectra of TiCl4 treated and untreated
photoanode Voc/V Jsc/(mA·cm-2) FF/% η/%
untreated 0.66 0.94 0.52 0.31
TiCl4-treated 0.68 1.00 0.57 0.38
Tab.2  Photovoltaic parameters of DSSCs made by ZnO cloths electrodes with and without TiCl4 treatment
Fig.7  Nyquist plots from impedance spectra of the ZnO photoanodes (I) with TiCl4 post-treated, (II) without TiCl4 treated measured at Voc under dark
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