SUPERLATTICES AND MICROSTRUCTURES
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2018
·
IF 2.099
Tianjiao Huang,Xiaoshan Zhang,Huan Wang,Xueting Chen,Lingling Wen,Meixin Huang,Yangshuai Zhong,Hui Luo,Guo Tang,Liya Zhou
In this paper, we developed a simple and convenient method for incorporating graphene with anatase-rutile TiO 2 composite and applied it as photoanode to improve the photovoltaic performance of CdS QDSSCs. Our research indicated in a CdS QDSSC system, the photoelectric conversion efficiency (PCE) of anatase-rutile TiO 2 (TGr0) composite photoanode was 86% higher than that rutile TiO 2 NRs. We also found that the PCE increased first and then decreased with the change of graphene content after the graphene was introduced into the anatase-rutile TiO 2 photoanode. When the ratio of optimized graphene/anatase TiO 2 particles composite that spin-coated on rutile TiO 2 NRs photoanode was 5%, we attained a maximum PCE of 2.20%, which was 178% and 50% higher than that pure TiO 2 NRs (0.79%) and TGr0 (1.47%), respectively.
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
Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 19
·3727-3734
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IF 5.958
Zizun Tian,Zhonglu Qi,Yuhao Yang,Hailong Yan,Qianqiao Chen,Qin Zhong
A Ti3C2/CuS composite has been fabricated as a counter electrode for quantum dot-sensitized solar cells by anchoring CuS nanoparticles on Ti3C2via a facile ion-exchange method at room temperature. The accordion-like Ti3C2 is well intercalated and coated with CuS nanoparticles at the optimized ratio of Ti3C2 to CuS. Both electrochemical impedance spectroscopy and Tafel polarization measurements indicate that the composite exhibits a significantly faster electrocatalytic rate towards the polysulfide reduction than pure CuS. The quantum dot-sensitized solar cell-based composite counter electrode displays an overall power conversion efficiency of 5.11% which is 1.5 times that obtained from the CuS counter electrode. The higher power conversion efficiency benefits from the improved short-circuit current density (20.86 mA cm−2), open-circuit voltage (0.56 V) and fill factor (0.45). The enhancement of photovoltaic performance is mainly attributed to the combined advantages of the excellent conductivity of the Ti3C2 skeleton and the abundant catalytically active sites of CuS nanoparticles.
研究领域:
材料科学
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能源技术
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电化学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
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2022
·
IF 7.188
Shuang'an Liu,Senyang Wang,Ying Cao,Chengyang Liang,Shitong Geng,Haipeng Guo,Ying Liu,Wenming Zhang,Ling Li
The catalytic enhancement of counter electrode materials is of an essential move for the overall evolution of QDSSCs. While the commonly used Cu 2 S/Cu counter electrode is easy to be eroded off by sulfur electrolyte, resulting in photoanode pollution. Herein, rough polyhedron Cu/Co@NCF composite is smoothly prepared via hydrothermal and synchronous doping method to replace Cu 2 S/Cu application. With the ZIF-67 as carbon source and morphology support, Cu and Co nanoparticles (NPs) are uniformly embedded in the carbon polyhedron without agglomeration, while the doping of nitrogen makes the composites have better porous structure. Combining the superior catalytic from Cu and Co particles with the electrical conductivity and stability from the carbon frame, the Cu/Co@NCF composite as QDSSCs counter electrode achieves an excellent photoelectric conversion effect (6.66%), close to that of Cu 2 S/Cu (7.29%). With stable and excellent counter electrode performance, Cu/Co@NCF composite unquestionably has the potential to be an alternative material for the CE application of QDSSCs.
研究领域:
材料科学
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能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 22
·8551-8556
·
IF 3.069
Qiqian Gao,Xiaojuan Sun,Xijia Yang,Liying Wang,Xuesong Li,Xueyu Zhang,Lianfeng Duan,Wei Lü
A key point for constructing quantum dot-sensitized solar cells (QDSSCs) with high efficiency is to improve the utilization of sunlight. While various TiO2 morphologies such as nanoparticles, nanosheets, nanotubes and nanorods have been used as photoanodes of QDSSCs for improving cell performance, these investigations are generally focused on a single morphology of TiO2. Herein, a combined photoanode structure based on TiO2 nanoparticles and {001}-faceted TiO2 nanosheets have been designed, which exhibits improvement in cell performance. Owing to the strong light scattering and fast electron transfer ability of TiO2 nanosheets, an optimal power conversion efficiency of 4.98% with a short circuit current density (Jsc) of 17.57 mA cm−2, an open circuit voltage (Voc) of 0.63 V and a fill factor (FF) of 0.45 is achieved compared to the TiO2 nanoparticle photoanode (3.61%). The present work offers a feasible method towards improving the efficiency of QDSSCs.
研究领域:
材料科学
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太阳能
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Sustainability
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2022
·
IF 7.244
Wenhua Li,Shule Zhang,Fengye Guo,Run Yu,Qianqiao Chen,Qin Zhong
Designing and constructing a delicate structure is an effective strategy to ensure the electrocatalytic stability of catalysts with excellent performance in quantum dot sensitized solar cells (QDSSCs) but remains challenging. Herein, ultrafine Co 4 N nanoparticles are encapsulated in a fish-scale-like N-doped carbon framework (Co 4 N@NC) in the form of Co–N–C bonds via a facile three-step method, including precursor construction, calcined carbonization and nitridation process. Notably, in the exquisite precursor construction process , the gelatinous chitosan induced by citric acid effectively bonds Co(Ⅱ) ions, and a fish-scale-like structure is designed under the action of template F127. The construction of this composite structure can increase contact with the electrolyte, favor electron conduction between particles, and improve the stability of the catalyst, thereby dramatically boosting the polysulfide reduction performance for QDSSCs. Co 4 N@NC is employed as the counter electrode (CE) of QDSSCs for the first time, its charge transfer resistance ( R ct ) is as low as 1.12Ω, and the power conversion efficiency of CdS/CdSe QDSSC reaches 5.54%, confirming extraordinary reduction activity towards S n 2− . Especially, compared with Co 4 N CE, Co 4 N@NC CE has better tolerance to polysulfide electrolytes and shows excellent electrochemical stability. This work provides a new strategy to improve the performance and stability of Co 4 N for the polysulfide reduction reaction.
研究领域:
材料科学
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电化学
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可再生能源
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太阳能电池
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2024
·
IF 3
Yushan Li,Jiao Men,Guangyan Zhou,Yanhong Qiao,Jingbo Zhang
To reveal the ways and causes of conversion efficiency enhancement for quantum dot-sensitized solar cells (QDSSCs), chalcopyrite structure CuInS 2 quantum dots (QDs) was synthesized in oil phase by the high temperature hot injection method. Then, QDs were transferred from oil phase to water phase with 3-mercaptopropionic acid as a ligand exchange reagent and loaded inducer of QDs. 3-mercaptopropionic acid coated QDs in water phase were sensitized on TiO 2 nanocrystalline thin films to fabricate QDSSCs. The sensitization time of QDs and pH value in QDs solution are two important factors to affect the loading amounts of QDs and performance of the final assembled QDSSCs. Long-time sensitization of QDs on the TiO 2 porous thin film will cause QDs to agglomerate and stack on the film. The pH of QDs aqueous solution influences the stable existence in solution of QDs and adsorption on the surface of TiO 2 . By balancing the influence of the above two factors, the optimal sensitization condition of CuInS 2 QDs is adsorption in pH = 11 QDs solution for 2 h. In addition, the interface between QD-sensitized TiO 2 porous thin film and FTO is another factor to affect the photoelectric conversion efficiency of QDSSCs. By adding Zn-doped TiO 2 compact layer with high conductivity and electron mobility on QDSSCs to modify this interface, the photoelectric conversion efficiency of QDSSCs was further increased by 66.4 %.
研究领域:
材料科学
·
纳米技术
·
太阳能
·
化学
✓ 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）