Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 33
·10379-10388
·
IF 6.641
Tao Hua,Keyi Zhang,Zu-Sheng Huang,Lingyun Wang,Hao Tang,Herbert Meier,Derong Cao
In this paper, the encapsulated insulated molecular wire (EIMW) and 2′,7′-bis(hexyloxy)spiro[cyclopenta[2,1-b:3,4-b′]dithiophene-4,9′-fluorene] (SPDF) were specifically designed as efficient anti-aggregation π-bridges for two novel D–A–π–A metal-free sensitizers (IBT1 and IBT2). Compared with the reference dye IBT3 with 3,3′-dihexyl-2,2′-bithiophene (DHBT) as an anti-aggregation π-bridge, both the dyes IBT1 with EIMW and IBT2 with SPDF as π-bridges can suppress intermolecular aggregation more efficiently. The π-bridge of SPDF shows the strongest anti-aggregation ability due to the rigid ‘T’ configuration among these dyes. Meanwhile, the π-bridge of EIMW shows better anti-aggregation ability than DHBT because of the larger steric hindrance of the former. Finally, when the dyes IBT1 and IBT2 are co-sensitized with IBT3, respectively, the new devices exhibit high efficiencies of 7.85% and 7.64%, respectively, which are comparable to that of N719 (7.85%). The results demonstrate that the dyes with EIMW and SPDF as anti-aggregation π-bridges are promising candidates for efficient DSSCs and dye aggregation can be effectively inhibited by structural engineering of the π-spacer.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Surfaces and Interfaces
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2022
·
IF 6.137
Kezhong Wu,Zejin Wang,Hui Zhao,Bei Ruan,FeiFei Nie,Rufen Chen,Mingxing Wu
The development of transition metal compounds (TMCs) and conductive polymers composite catalysts substitute for the traditional scarce Pt-based catalysts of counter electrodes (CEs) has been recognized as one of the distinguishing paths to enhance power conversion efficiency (PCE) and decrease manufacturing costs of dye-sensitized solar cells (DSSCs). At present, various thin film preparations have been developed and applied to prepare assortment CEs. Herein, both polyaniline (PANI) and CuWO 4 film were prepared, and further to fabricate layer-by-layer composite CEs of CuWO 4 /PANI, PANI/CuWO 4 , CuWO 4 /PANI/CuWO 4 , PANI/CuWO 4 /PANI, aiming to promote the charge transfer capability and thus improve catalytic activity. And then, PANI, CuWO 4 and four composite layered CEs obtained PCE values of 5.14, 5.64, 5.96, 6.21, 4.96 and 4.24% toward the regeneration of I 3 − /I − redox couples in the assembled DSSCs, respectively. Particularly, the fascinating performance of the bilayer PANI/CuWO 4 CEs inherits the excellent electrical conductivity and the abundant porous structure of PANI skeletons for effective electrolyte diffusion. Meanwhile, the CuWO 4 layer was coupled to the layers of PANI by thermal activation annealing treatment to furnish rich inner active sites for the regeneration of I 3 − /I − couples. Benefit from the synergistic effects of PANI and CuWO 4 , the as-prepared PANI/CuWO 4 CEs manifests the highest PCE of 6.21%, indicating an inspiring strategy by the layered assembly Pt-free CEs with the cost effective and high-performance as an alternative Pt-based catalyst for DSSC.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
SOLAR ENERGY
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2021
·
IF 5.742
Abdelaal S.A. Ahmed,Wanchun Xiang,Fatma S.M. Hashem,Xiujian Zhao
Platinum (Pt)-based counter electrodes (CEs) are promising electrocatalysts for dye-sensitized solar cells (DSSCs). However, replacing the expensive Pt with low-cost materials and comparable catalytic activity still a big challenge. Here, we prepared CB-SiO 2 composites by blending various weights of SiO 2 (1, 3, and 5 wt%) with carbon black (CB), followed by screen printed onto the FTO substrate to utilized as CEs for DSSCs. In comparison with pure CB, CB-SiO 2 composite CEs showed higher transferability and higher electrocatalytic activity toward I 3 - / I - redox couple. Among all, CB-SiO 2 -1% composite CE with 4 µm showed the best catalytic performance, and the related DSSC showed a power conversion efficiency of 6.38%. Increasing the CE thickness significantly enhances the catalytic ability and the total performance of the assembled devices, whereas the power conversion efficiency of the DSSC with CB-SiO 2 -1% composite CE in 8 µm thick was 7.99%, which is close to that achieved by Pt-based device under the same conditions.
研究领域:
材料科学
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能源研究
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Wenzhang Li,Guanhua Jin,Haishi Hu,Jie Li,Yanghui Yang,Qiyuan Chen
Dye-sensitized solar cells (DSSCs) based on phosphotungstic acid–TiO 2 composites (PT) and WO 3 nanoparticle incorporated TiO 2 photoanodes were successfully constructed by doctor blading TiO 2 paste containing PT and various amounts of WO 3 . Film features were investigated by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, and ultraviolet–visible spectroscopy. Photoelectrochemical properties were examined by the photocurrent–voltage ( J – V ) curves as well as monochromatic incident photon-to-photocurrent conversion efficiency and electrochemical impedance spectroscopy (EIS) measurements. Compared with the DSSC based on pure P25 films, that based on PT/P25 films yielded a 16.9% higher J sc and a 21.3% higher η , while that based on PT/P25 + 1/70WO 3 films resulted in a 49.2% higher J sc and a 40.3% higher η . EIS data demonstrated that charge transfer resistance was clearly reduced by introducing PT and WO 3 into TiO 2 films. The introduction of PT and WO 3 was observed to promote electron transfer and retard recombination synergistically, leading to a significant improvement in cell performance.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
Journal of Renewable Materials
·
2020
·Vol. 8
·期 4
·431-446
·
IF 1.341
Zhang Weiming,Wasim Muhammad,Zuo Xueqin,Yang Qun,Tang Huaibao,Jin Shaowei,Li Guang
A novel sunflower-like nanocomposite of SrCo2S4 nanoflakes and functionalized multiwall carbon nanotubes (f-MWCNTs) entanglement enveloped in nitrogen-reduced graphene oxide (N-RGO) is prepared by a cheap process. The unique entanglement structure of the material
exhibits higher specific surface area, better electrical conductivity and other properties. This helps to reduce the transfer resistance in the photoelectric process of the battery and improve the electrochemical activity, thus increasing the photoelectric conversion efficiency of the battery.
The new ternary cobalt-based sulfide material can replace platinum as the counter electrode (CE) material loaded on dye-sensitized solar cells (DSSCs). DSSCs with SrCo2S4@f-MWCNTs@N-RGO (SCS@f-M@N-R) as CE material show excellent photoelectric conversion efficiency (PCE,
8.06%), even surpassing than that of Pt CE material (7.51%). The low cost, excellent electrocatalytic performance and simple preparation method of SCS@f-M@N-R nanomaterial provide feasibility for replacing platinum material as the CE material of DSSCs, which is of great significance and persuasion.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 13
·4743
·
IF 3.4
Jianming Wen,Suqin Chen,You Xu,Tuxiang Guan,Xiaoyan Zhang,Ningzhong Bao
Two-dimensional Cu2FeSnS4(CFTS) nanosheets with exposed high-energy facets (111) have been synthesized by a facile, scalable, and cost-effective one-pot heating process. The CFTS phase formation is confirmed by both X-ray diffraction and Raman spectroscopy. The formation mechanism of exposed high-energy facet CFTS growth is proposed and its electrochemical and photoelectrochemical properties are investigated in detail to reveal the origin of the anisotropic effect of the high-energy facets. Dye-sensitized solar cells (DSSC) achieve a favorable power conversion efficiency of 5.92% when employing CFTS thin film as a counter electrode, suggesting its potential as a cost-effective substitute for Pt in DSSCs.Keywords:Cu2FeSnS4nanosheets;high-energy facets;counter electrode;dye-sensitized solar cells
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
ELECTROCHEMISTRY COMMUNICATIONS
·
2020
·
IF 4.333
Jihuai Wu,Shaoyun Wu,Weihai Sun
A polyoxometalate (H 3 PW 12 O 40 , PW 12 )-doped polypyrrole (PW 12 -PPy) hybrid film was successfully prepared by electropolymerization. The PW 12 -PPy composite film was used as an efficient Pt-free counter electrode in a dye-sensitized solar cell (DSSC). The surface appearance, chemical composition and internal phase structure of the samples were investigated by scanning electron microscopy, infrared spectroscopy and X-ray diffraction. Electrochemical impedance spectroscopy and cyclic voltammetry measurements recorded using the prepared electrodes indicate that the PW 12 -PPy electrode has a higher reduction peak current density and a smaller series resistance than the Pt electrode, suggesting that the electrocatalytic activity of the PW 12 -PPy electrode for I 3 − reduction is better than that of the Pt electrode. Under simulated solar irradiation (AM 1.5) with an intensity of 100 mW⋅cm −2 , the DSSC based on the PW 12 -PPy counter electrode produces an average power conversion efficiency (PCE) of 6.19%; this efficiency value is on a par with that of similar devices using Pt as the cathode (6.25%).
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Pengkun Wei,Zewei Hao,Yang Yang,Lu Liu
Although nickel-based counter electrodes display good catalytic properties in dye-sensitized solar cells (DSSCs), there are challenges to achieve efficient activity for practical device. Except that, vacancy can effectively regulate electrocatalytic efficiency for the catalytic reactions, which take place on the surface of catalysts. Thereby, the hollow Ni 0.85 Se nanospheres grown on the reduced graphite oxide (RGO) were designed to attain the composites utilizing a facile hydrothermal strategy, and followed by heating within argon atmosphere at 400 °C (NiSe 2 -400) and 450 °C (NiSe 2 -450), forming NiSe 2 /RGO composite catalysts with abundant vacancies. Importantly, the resultant NiSe 2 -400 as counter electrode (CE) exhibits superior electrochemical properties in DSSCs, thus yielding a remarkable photovoltaic performance (8.93%), which may originate from the existence of the appropriate Ni-Se dual vacancies, accelerating the I 3 − reduction. The work would provide a strategy for the synthesis of other non-noble metal compounds with unconventional dual vacancies to develop the application of DSSCs.
研究领域:
材料科学
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能源科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Niu Huang,Lin Chen,Hua Huang,Weiwei Sun,Shouzheng Zhang,Panpan Sun,Xiaohua Sun,Peng Xiang,Yihua Sun,Xingzhong Zhao
TiO 2 pyramids with planar-surface morphology presenting in the phases of anatase and brookite are successfully prepared, the height of which is 300-500 nm and 80-200 nm wide at the bottom. The pyramids exhibit excellent reflectance in the visible-near infrared region. When introducing the pyramids as a scattering layer covering the layer composed of TiO 2 nanoparticles , the energy conversion efficiency of dye-sensitized solar cell (DSSC) is enhanced from 6.49% to 7.25%. However, the pyramids overlayer falls from the nanoparticles underlayer easily, and the fill factor of the DSSC with the pyramids layer also become much lower. To solve the problem, we substitute TiO 2 microspheres underlayer for NP underlayer. As the tips of pyramids could be inserted into the submicron-sized gaps between the TiO 2 microspheres, the interface connection between layers of photoanode is reinforced. Current-Voltage measurement shows that the fill factor of the DSSC is much improved, and the DSSC has achieved 8.35% energy conversion efficiency. This study shows that the novel bilayer photoanode with improved light utilization and interface connection is an interesting structure for high efficiency DSSCs.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2015
·
IF 4.642
Shanlong Chen,Aichun Xu,Jie Tao,Haijun Tao,Yizhou Shen,Lumin Zhu,Jiajia Jiang,Tao Wang,Lei Pan
A novel in-situ and green method with the combination of TiCl4 pretreatment and solvothermal growth was proposed to prepare the Pt-free Cu2ZnSnS4 (CZTS) counter electrodes (CEs) on FTO substrate. It was found that TiCl4 pretreatment toward the substrates was crucial to a high quality and high efficiency CZTS film, which consists of nanosheet and nanoparticle structure. The highly crystallized nanosheets were assembled from kesterite structure CZTS nanocrystals, with an average diameter of 10–30 nm. The detailed morphology, crystal structure, and composition of the CZTS nanostructures were characterized by SEM, TEM, SAED, XRD, Raman, and EDS analysis, respectively. Electrocatalytic abilities of the films toward I–/I3– were verified through cyclic voltammograms (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization measurements. A maximum power conversion efficiency of 5.65% was achieved for a cell with CZTS 3, under 100 mW/cm2, which was higher than that of a cell with a commercial Pt counter electrode (4.96%). This high efficiency was mainly attributed to the good bonding strength between CZTS films and FTO substrate (RS = 4.41 Ω cm2), and higher electron-transfer process at the electrolyte/CE interface (high JSC), along with superior electrochemical catalytic ability (RCt = 2.40 Ω cm2). The in-situ prepared CZTS CEs are proven to be suitable for high efficiency Pt-free dye-sensitized solar cells (DSSCs), leading to significantly decrease of the cell cost and simplification of preparation process.
研究领域:
材料科学
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能源科学
·
纳米技术
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Liang Chu,Zhengfei Qin,Qiaoxia Zhang,Wei Chen,Jian Yang,Jianping Yang,Xing⿿ao Li
Mesoporous anatase TiO 2 microspheres with interconnected nanostructures meet both large surface area and connected-structure for electron transfer as ideal nano/micromaterials for application in solar cells, energy storage, catalysis, water splitting and gas sensing. In this work, mesoporous anatase TiO 2 microspheres consisting of interconnected nanoparticles were synthesized by template-free, one-step fast solvothermal process, where urea was used as capping agent to control phase and promote oriented growth. The morphology was assembled by nucleation-growth-assembly-mechanism. The mesoporous anatase TiO 2 microspheres with interconnected nanoparticles were further utilized as efficient photoelectrodes of dye-sensitized solar cells (DSSCs), which were beneficial to capacity of dye loading and charge transfer. The power conversion efficiency (PCE) based on the optimized thickness of TiO 2 photoelectrodes was up to 7.13% under standard AM 1.5 G illumination (100 mW/cm 2 ).
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2022
·Vol. 37
·期 11
·1835-1844
·
IF 2.909
Yang Meng,Zhou Guangyan,Wei Yajuan,Huang Zhengguo,Zhang Jingbo
The catalytic activity of quaternary Cu 2 ZnSnS 4 (CZTS) as counter electrode (CE) of dye-sensitized solar cells (DSSCs) was enhanced by covering Co 9 S 8 on CZTS thin film prepared by the spin-coating method. The effect of the repeating number of spin coating process on morphologies and catalytic properties of CZTS thin films was investigated. When the repeating number of spin coating processes is 3, the CZTS thin film thickness is moderate and the formed nanoparticles are tightly bound. The conversion efficiency of DSSC based on the CZTS thin film CE prepared by 3 spin coating cycles reaches 4.79%. By forming a CZTS/Co 9 S 8 composite electrode via vulcanizing the deposited ZIF-67, the highest photoelectric conversion efficiency of DSSC based on the optimized composite CE further reaches 6.41%. The higher photoelectric conversion efficiency is attributed to the good interfacial transferring of electrons and redox properties for electrolyte of the composite CE. Graphical abstract
研究领域:
材料科学
·
能源科学
✓ 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）