OPTICS COMMUNICATIONS
·
2015
·
IF 1.449
Yibing Lin,Yu Lin,Yongming Meng,Yongguang Tu,Xiaolong Zhang
SnO 2 nanoparticles were synthesized by hydrothermal method and applied to photo-electrodes of quantum dots-sensitized solar cells (QDSSCs). After sensitizing SnO 2 films via CdS quantum dots , CdSe quantum dots was decorated on the surface of CdS/SnO 2 photo-electrodes to further improve the power conversion efficiency. CdS and CdSe quantum dots were deposited by successive ionic layer absorption and reaction method (SILAR) and chemical bath deposition method (CBD) respectively. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) were used to identify the surface profile and crystal structure of SnO 2 photo-electrodes before and after deposited quantum dots. After CdSe co-sensitized process, an overall power conversion efficiency of 1.78% was obtained in CdSe/CdS/SnO 2 QDSSC, which showed 66.4% improvement than that of CdS/SnO 2 QDSSC.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Ping Wang,Minmin Wang,Jie Zhang,Chuanping Li,Xiaolong Xu,Yongdong Jin
Colloidal semiconductor quantum dots (QDs) have recently emerged as a good candidate for photocatalytic hydrogen (H2) evolution in water. A further understanding of the factors that can affect and boost the catalytic activity of the QD-based H2-generating system is of great importance for the future design of such systems for practical use. Here, we report on the fine shell thickness engineering of colloidal CdS/CdSe core/shell QDs and its effect on the photocatalytic H2 production in water. Our results show that, with the proper shell thickness, the H2 photogeneration quantum yield (ΦH2) of CdS/CdSe core/shell QDs could reach 30.9% under the illumination of 420 nm light, which is 49% larger than that of the CdS core. Furthermore, the underlying mechanism has also been tentatively proposed and discussed.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemPlusChem
·
2018
·Vol. 83
·期 12
·1088-1096
·
IF 3.205
Ping Wang,Chuanping Li,Minmin Wang,Yongdong Jin
Graphical Divalent nickel can be decorated onto CdS/CdSe core/shell quantum dots (QDs) in a controlled fashion. Under optimized conditions these QDs catalyze light-induced H 2 evolution from water with a turnover frequency of 322 h −1 with respect to Ni and a quantum yield of 12.3 % at 520 nm. The search for a low-cost, noble-metal-free cocatalyst to replace expensive Pt for hydrogen (H 2 ) photogeneration in water has become a hot research topic, and among these, Ni-based cocatalysts are promising and highly desired. Developing new strategies and protocols to obtain Ni-based cocatalysts with high activity is therefore vitally important. Herein, we develop a new method to efficiently decorate divalent Ni onto pre-synthesized CdS/CdSe core/shell quantum dots (QDs). The concentration of Ni on the QDs can be easily tuned by varying the amount of the Ni precursor introduced during the synthesis. Further analyses reveal that Ni 2+ can be strongly decorated onto QDs. Impressively, the Ni-decorated QDs displayed a significantly enhanced H 2 photogeneration performance as compared to the two components prepared separately. Through the optimization of the Ni concentration on the QDs, the turnover frequency (TOF) with respect to Ni and quantum yield ( ) at 520 nm for H 2 evolution from water could reach 322 h −1 and 12.3 %, respectively. A possible mechanism has also been proposed and discussed in detail.
研究领域:
材料科学
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能源化学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2012
·
IF 3.832
Xingtian Yin,Wenxiu Que,Duan Fei,Haixia Xie,Zuoli He,Gangfeng Wang
Strategies employed to fabricate an efficient photoanode with ZnO nanowires (NWs) arrays and CdS–CdSe co-sensitizers were investigated. A detailed procedure for growing long ZnO NWs which are suitable for the application in quantum dot sensitized solar cells was discussed, and several optimized parameters were obtained for fabrication of the ZnO NWs with large aspect ratio. CdS and CdSe layers were deposited on the surface of the ZnO NWs by a successive ionic-layer adsorption and reaction method and the deposition process was optimized according to the performance of the solar cells fabricated with the ZnO/CdS NWs and the ZnO/CdS/CdSe NWs arrays, respectively. The relationship between the thickness of the sensitizer layer and the performance of the devices was also discussed in detail. Transmission electron microscopy observation shows that ∼7 nm thick CdS layer and ∼5 nm thick CdSe layer can be easily achieved on the ZnO NWs at an optimal deposition condition. UV–vis absorption spectra demonstrate that the light absorption range of the ZnO/CdS/CdSe NWs can be almost extended to the whole visible range. Through an optimization of the photoanode fabrication, which mainly includes the synthesis of the ZnO NWs arrays and the deposition of the CdS and CdSe layers, a short circuit current density as high as 18.63 mA/cm 2 with an overall efficiency of 3.06% can be obtained for the resulting device.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-7
·
IF 2.584
Chen Zeng,Wei Chaochao,Li Shengjun,Diao Chunli,Li Wei,Kong Wenping,Zhang Zhenlong,Zhang Weifeng
SnO 2 nanosheet-structured films were prepared on a fluorine-doped tin oxide (FTO) substrate using ZnO nanosheet as template. The as-prepared SnO 2 nanosheets contained plenty of nano-voids and were generally vertical to the substrate. TiO 2 nanoparticles were homogeneously deposited into the intervals between the SnO 2 nanosheets to prepare a hierarchically structured SnO 2 /TiO 2 hybrid film. The hybrid films were co-sensitized with CdS and CdSe quantum dots. The sensitized solar cells assembled with the SnO 2 /TiO 2 hybrid film showed much higher photoelectricity conversion efficiency than the cells assembled with pure TiO 2 films. The lifetime of photoinduced electron was also investigated through electrochemical impedance spectroscopy, which showed that the SnO 2 /TiO 2 hybrid film electrode is as long as the TiO 2 film electrode.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 24
·15724-15733
·
IF 4.123
Qingqing Qiu,Ping Wang,Lingling Xu,Dejun Wang,Yanhong Lin,Tengfeng Xie
Anatase TiO2 nanowire (NW) films modified with inverted type-I CdS/CdSe core/shell structure QDs have been successfully prepared by the post synthesis ligand-assisted technique. Surface photovoltage (SPV), transient photovoltage (TPV) and transient photocurrent (TPC) measurements demonstrate that CdS/CdSe core/shell structure QD-sensitized TiO2 NWs electrodes favor photoexicited electron injection and charge transfer due to the special photo-electronic features of CdS/CdSe core/shell structure QDs. With a polysulfide electrolyte, the maximum conversion efficiency was 2.18% for CdS/CdSe QDs with the CdSe shell being 4.4 nanometers thick; a PCE of 0.07% for CdS QDs and a PCE of 0.63% for CdSe QDs were obtained under illumination at 100 mW cm−2. The results reveal that the CdS/CdSe core/shell structure QDs sensitized TiO2 NW electrodes have promising applications in solar cells.
研究领域:
材料科学
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光伏技术
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纳米科技
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Changlin Li,Shangrong Chen,Xiangxiang Gao,Wei Zhang,Yanfang Wang
The photoelectrochemical (PEC) performance of ZnO is restricted by its low light absorption ability and high recombination rate of photogenerated carriers. In order to overcome these drawbacks, ZnO/CdS/CdSe heterostructures are prepared on Zn foil substrate using facile three-step methods containing hydrothermal growth, successive ionic layer adsorption reaction (SILAR) and modified chemical bath deposition (CBD). The effects of process parameters containing the number of SILAR cycles of CdS, sensitization sequence of CdS and CdSe, and precursors of CdSe on PEC performance of ZnO/CdS/CdSe heterostructures, and ZnO NRAs on PEC performance of CdS/CdSe co-sensitizer have been scrutinized. Through CdS and CdSe co-sensitization, a layer of CdS/CdSe nanofilm is conformally deposited on ZnO nanorod arrays (NRAs) observed by transmission electron microscopy (TEM). Both the visible-light absorption ability and separation efficiency of photogenerated carriers of ZnO NRAs are significantly enhanced evidenced by UV–vis diffuse reflectance absorption spectra , photoluminescence (PL) spectra and electrochemical impedance spectra. Due to the synergistic effect of ZnO NRAs and CdS/CdSe co-sensitizer, the ZnO/CdS/CdSe heterostructures with five SILAR cycles and one modified CBD cycle (ZnO-CdS5-CdSe) show efficient PEC properties with photocurrent density of 6.244 mA/cm 2 at −0.2 V vs Ag/AgCl under light illumination of 100 mW/cm 2 , which are 57.28 and 4.73 times higher than those of pristine ZnO NRAs and CdS/CdSe clusters, respectively. Moreover, the photoconversion efficiency and incident photon to current conversion efficiency (IPCE) of the ZnO-CdS5-CdSe photoanode reach 4.381% and 80.92%, respectively. The heterostructures based on Zn foil substrate in this study can be a promising candidate for practical PEC application and other applications such as photocatalytic degradation and solar cell due to its low manufacturing cost, large-scale production and efficient PEC ability.
研究领域:
材料科学
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光电化学
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纳米技术
·
太阳能转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xinglin Jia,Jianan Li,Yuhong Liu,Wenzhong Wang,Yujie Li,Lei Liu,Huabin Chen,Guling Zhang,Sitong Liu,Qing Zhou,Lijuan Wang
A novel CdS/CdSe/Cu 2 O nanorod array (NRA) photoelectrode with cascading charge transport channels was designed for the first time to remarkedly boot photoelectrochemical (PEC) hydrogen generation under visible light illumination with zero bias. This ternary photoelectrode was constructed by modifying CdS nanorod arrays with n-type CdSe and p-type Cu 2 O nanoparticles , successively. In this novel photoanode , CdSe and Cu 2 O with small band gap not merely highly heighten the visible light absorption capacity of CdS, but more importantly integrate with CdS to build cascading charge transport channels at the CdS/CdSe and CdSe/Cu 2 O interfaces, dramatically facilitating the separation and transport efficiency for photoexcited electron and hole pairs. The CdS/CdSe/Cu 2 O NRA photoelectrode gains an obvious hydrogen generation rate of 193.2 μmol·h −1 , 8.2 times higher than that of bare CdS NRA photoelectrode. The remarkably enhanced PEC hydrogen production for the CdS/CdSe/Cu 2 O NRA photoanode can be ascribed to effective solar energy utilization and charge carrier separation.
研究领域:
材料科学
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能源科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2017
·
IF 4.536
Qiang Wu,Haifeng Zhao,Fei Huang,Juan Hou,Haibin Cao,Zhiyong Liu,Shanglong Peng,Guozhong Cao
The introduction of various amounts of reduced graphene oxide (RGO) to CdS/CdSe quantum dots co-sensitized solar cells was investigated to enhance the light absorption and to promote the electron transfer. The characterization and comparison of optical and electrochemical properties as well as the performance of the resultant quantum dot-sensitized solar cells (QDSCs) with different amounts of RGO have been investigated systematically. The introduction of RGO demonstrated to enhance the light harvesting and consequently increase the short-circuit current density (Jsc). ZnS inserting between QDs and RGO can effectively block the charge recombination at the interface; however, the defects of RGO in the TiO2/QDs/ZnS/RGO photoanode still may accelerate the interface charge recombination in QDSCs and lead to a slight decrease of the open-circuit voltage (Voc). The balance between the light harvesting and charge recombination in RGO modified QDSCs is a key for achieving high power conversion efficiency (PCE). Finally, the CdS/CdSe/ZnS co-sensitized cell with modification RGO (3 min) achieved a high PCE of 5.28% (Jsc = 15.8 mA/cm2, Voc = 572 mV), more than 13% higher than that of 4.69% (Jsc = 13.7 mA/cm2, Voc = 602 mV) obtained for the cell without RGO.
研究领域:
光伏技术
·
纳米材料
·
量子点太阳能电池
·
能源材料
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2019
·
IF 0
Yuan Wang,Zhou Yang,Yunxia Huang,Yangxi Yan,Juan Hou,Zhimin Li,Guozhong Cao
Control of structural and compositional characteristics of photoanodes is a crucial step toward rapid transport of charges and high-efficiency loading of dye or quantum dots in the case of solar cell application. Hierarchical ZnO microspheres (ZMS) and TiO2 hybrid photoanode film were prepared for improved CdS/CdSe quantum dot sensitized solar cells (QDSCs). The addition of ZMS into TiO2 electrode films resulted in both increased short circuit current density (Jsc) and open circuit voltage (Voc). Such an improvement is ascribed to the increased light harvesting owing to scattering by ZMS and the reduced charge recombination due to the surface modification. TiO2/ZMS hybrid photoanode displays superior charge injection/transport performance due to the ZMS with unique hierarchical structure, providing charge transfer continuity and multiple electron transport channels for timely electron transport. As a result, the Jsc, Voc, and the photovoltaic conversion efficiency (PCE) were all remarkably enhanced with the insertion of hierarchical ZMS though varied appreciably with the amount of ZMS. Thus, the designed TiO2/ZMS heterostructure-based QDSCs with an optimizing ZMS ratio of 20 wt % achieved a PCE of 5.99%, which is about 35% increase of the efficiency for the devices without ZMS (4.45%).
研究领域:
材料科学
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光伏技术
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纳米技术
·
能源材料
✓ 已验证
DOI
Science China-Materials
·
2020
·Vol. 63
·期 4
·516-523
·
IF 6.098
Deng Yunlong,Lu Shuqi,Xu Zhiyuan,Zhang Jiachi,Ma Fei,Peng Shanglong
Light absorption plays an important role in improving the power conversion efficiency (PCE) of quantum dot-sensitized solar cells (QDSSCs). In this study, a multifunctional long-persistence phosphor (LPP) layer was introduced into the CdS/CdSe QDSSCs via a simple doctor blade method. The LPP layer can simultaneously improve the light harvesting and photo charge transfer in CdS/CdSe QDSSCs. As a result, their short-circuit current and corresponding PCE are effectively enhanced. The PCE can reach up to 5.07%, which is about 24% larger than that of the conventional CdS/CdSe QDSSCs without LPP layer. The solar cells can work in dark for a while due to the long-lasting fluorescence of the LPP layer. This research provides an effective way to improve the PCE of QDSSCs, and finds the possibility for all-weather QDSSCs.
研究领域:
光伏技术
·
材料科学
·
纳米技术
·
能量转换
✓ 已验证
DOI
高影响因子
Journal of Nanomaterials
·
2020
·
IF 1.98
Shibing Zou,Feng Li
Highly efficient all-inorganic perovskite solar cells require a fast charge transfer from CsPbBr3 to TiO2 to reduce the recombination from trap states. Herein, we insert a CdS/CdSe/CdS quantum dot (QD) layer between the TiO2 and CsPbBr3 layers to fabricate all-inorganic perovskite solar cells. By tuning the thicknesses of the CdSe layer of CdS/CdSe/CdS QDs, the conduction band (CB) levels can be adjusted to -3.72~-3.87 eV. After inserting the QD intermediate layer, the energy offset between the CB of TiO2 and CsPbBr3 is reduced, thus leading to a charge transfer rate boost from to . The power conversion efficiency (PCE) of the solar cell with QD intermediate layer achieves 8.64%, which is 20% higher than its counterpart without QDs.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）