CARBON
·
2017
·
IF 6.337
Hong Yuan,Qingze Jiao,Jia Liu,Xiufeng Liu,Yongjian Li,Daxin Shi,Qin Wu,Yun Zhao,Hansheng Li
A novel nanocomposite of Co 0.85 Se nanotubes with reduced graphene oxide (Co 0.85 Se/RGO) is prepared by a facile hydrothermal approach coupled with in situ selenization, which is applied as counter electrode in dye-sensitized solar cells. Electrochemical analysis shows that the Co 0.85 Se/RGO composite displays a higher electrocatalytic activity for the reduction of triiodide respect to its single components due to the unique hollow structure of Co 0.85 Se as well as the synergistic effects of high catalytically active Co 0.85 Se and conductive RGO. As a consequence, the dye-sensitized solar cell (DSSC) fabricated with the Co 0.85 Se/RGO electrode presents a high photovoltaic conversion efficiency of 7.81%, exceeding the cell based on a Pt electrode (7.55%). Moreover, a considerable electrochemical stability is also achieved when the material was used as a counter electrode in a I − /I 3 − electrolyte. Therefore, the Co 0.85 Se/RGO exhibits a huge potential as efficient and low-cost Pt-free counter electrode material to replace Pt allowing for large-scale fabrication of DSSCs.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Ye Zhang,Ning Zhou,Keqin Zhang,Feng Yan
Plasmonic copper nanowires@TiO 2 (Cu NWs@TiO 2 ) core-shell nanostructures are synthesized and applied for dye sensitized solar cells (DSSCs). Both experimental and theoretical studies (Finite Difference Time Domain Simulation) reveal that doping of the Cu NWs@TiO 2 nanostructures into the TiO 2 photoanodes can enhance the light absorption of dye molecules and the carrier's separation through the localized surface plasmon resonance (LSPR) and plasmonic waveguide (PW) effects, and thus significantly improve the light harvesting efficiency of the device. The optimized doped DSSCs show the best power conversion efficiency (PCE) of 9.44%, which is 23.40% higher than that of undoped DSSCs (7.65%).
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2012
·
IF 3.832
Chaolei Wang,Liang Wang,Yantao Shi,Hong Zhang,Tingli Ma
Novel polymer gel electrolytes (PGEs) with high ionic conductivity based on polyvinyl (acetate-co-methyl methacrylate) [P(VA-co-MMA)] were prepared by soaking porous copolymers in an organic electrolyte solution [acetonitrile (ACN) or 3-Methoxypropionitrile (MPN)] that contained an I 3 − /I − as redox couple. Quasi-solid-state dye-sensitized solar cells (QS-DSSCs) were fabricated with the PGEs, and the best PGE was selected and optimized. Using the best PGE and under 100 mW cm −2 light illumination (AM1.5), the QS-DSSC achieved a high photovoltaic conversion efficiency of 9.10%, nearly the same as that for the DSSC based on the original liquid electrolyte . Introduction of TiO 2 nanoparticles into the PGEs further enhanced PGEs ionic conductivity and the conversion efficiency to 9.40%. Subsequent results revealed that our QS-DSSC had a better stability because it could maintain 96.7% of its initial efficiency after long-time (1000 h) exposure to simulative sunlight. Besides, for the first time, large-area QS-DSSCs were fabricated by screen printing of PGE, other than the traditional vacuum injection that was infeasible for the viscous gel electrolyte. Finally, our 5 cm × 7 cm QS-DSSC sub-module exhibited a conversion efficiency higher than 4%.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2012
·
IF 4.951
Wei Zeng,Guojia Fang,Xueqi Wang,Qiao Zheng,Borui Li,Huihui Huang,Hong Tao,Nishuang Liu,Weijun Xie,Xingzhong Zhao,Dechun Zou
A nano-carbon composite with unique hierarchical porous structure has been effectively fabricated as dye sensitized solar cell (DSSC) counter electrode material by a simple and low-cost way. The fabrication process only employs spin-coating and then combustion by using sodium lauryl sulfate as a facile pore-forming precursor. The generated composite reveals high catalytic ability coupled with low electrical resistance owing to its unique structure. The power conversion efficiency of the resulting DSSC device reaches 6.5%, which is close to 6.6% of the referenced DSSC by using platinum as the counter electrode. A mass transfer model is built and it convincingly demonstrates that the composite architecture is beneficial to carrier transport. The fabrication strategy is simple and effective, and it has a great potential to be applied to DSSC fabrication on a large scale.
✓ 已验证
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 ).
✓ 已验证
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.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Lu Han,Ye Feng Wang,Jing Hui Zeng
Thiaozole/benzothiaozole-based dicationic conductors were synthesized and applied as solid-state electrolyte in dye-sensitized solar cells (DSSCs). X-ray diffraction, scanning electron microscopy, thermal gravimetric analysis, steady-state voltammogram, photocurrent intensity–photovoltage test, and electrochemical impedance spectroscopy are used to characterize the materials and the mechanism of the cell performance. Compared to the traditional monocationic crystals, the dicationic crystals have a larger size and can provide more opportunities to fine-tune their physical/chemical properties. As a consequence, this solid-state electrolyte-based DSSC achieved photoelectric conversion efficiency of 7.90% under full air-mass (AM 1.5) sunlight (100 mW·cm–2).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 45
·35635-35642
·
IF 3.84
Waqar Ahmad,Liang Chu,Majid Raissan Al-bahrani,Zhichun Yang,Siliang Wang,Luying Li,Yihua Gao
In this study, we synthesized monolithic copper-oxide nanorods (CuO-NRs) and doped into active super hydrophobic acetylene black (AB) nanocrystals via a fast solvation method. The developed short-dimension assemblies are utilized as counter electrode (CE) materials for energy harvesting in dye sensitized solar cells (DSSCs). Cyclic voltammetry and electrochemical impedance spectroscopy analyses reveal that the hybrid (CuO-NRs/AB) CE displays a fast reduction rate of I3− and boosts hole-cascading as compared to those of individual AB CEs, due to the superior catalytic characteristics of CuO-NRs and the good electrical conductivity of AB. The CuO-NRs/AB based DSSCs exhibit an enhanced power conversion efficiency (PCE) of 8.05%, in contrast to AB (6.51%) and pristine Pt (6.96%) CE based DSSCs under the same experimental conditions. The CuO-NRs/AB CE, along with impressive results, has prospective applications in robust DSSCs.
✓ 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.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Xianglong Li,Huanhuan Chen,Bin Yang
Centrifugal spinning and electrospinning have proved to be effective techniques for fabricating micro-to-nanofibers. However, starches of amylopectin content above 65% cannot be fabricated to fiber by electrospinning. This paper is focus on the centrifugal spinnability of amylopectin rich starches. We investigated the amylopectin content of starches by Dual-wavelength colorimetry, studied the rheological properties of starch dopes to determine entanglement concentration ( c e ) by rotary rheometer. Results indicated that amylopectin rich native corn and potato starches, which with amylopectin content higher than 65%, were suitable for centrifugal spinning to micro-to-nanofibers. Additionally, starch-based fibers were successfully fabricated from the amylose rich corn starch as well. Rheological studies showed that the entanglement concentration ( c e ) of starch solution was crucial for successful centrifugal spinning.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CRYSTAL GROWTH
·
2014
·
IF 1.693
Huanyong Li,Zhi Gu,Haiyang Zhang,Wenwei Li
A modified chemical vapor transport system is developed to grow ZnSe single crystals from zinc–selenium source materials, where iodine serves as the chemical transport agent to avoid the kinetics limitations of the congruent sublimation conditions. ZnSe crystals with different crystalline quality are obtained under various growth conditions. The thermodynamic properties of Zn-Se-I 2 system are studied by combining the mass conservation with the vapor-solid reactions related to crystal growth. The mass transport is analyzed by using the diffusion-convection mathematical model. Depending on initial iodine concentration and the designed temperature difference between source zone and growth zone, the optimum growth conditions can be predicted based on the calculated maximum growth rate. Comparing growth results with theoretical analysis indicates that Zn-Se-I 2 system affords a feasible route to grow ZnSe crystals. High quality ZnSe crystal can be achieved under the theoretically optimized growth conditions.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2014
·Vol. 16
·期 16
·3403-3413
·
IF 3.858
Enyan Guo,Longwei Yin,Luyuan Zhang
We report on solar cells based on CdS QD sensitized anatase TiO2 hierarchical nanostructures prepared via a facile and controlled hydrothermal process. To adjust the size of CdS QDs, the TiO2 surfaces were first treated with thiolactic acid which provides a binding site for Cd2+ ions. CdS QDs with controllable size are grown onto the TiO2 hierarchical nanostructures. The CdS QDs/TiO2 hierarchical heterojunction nanocomposites display a red shift from the ultraviolet to the visible light region with a longer wavelength for the absorption edge. The matching of band edges between CdS and TiO2 to form a semiconductor heterojunction plays an important role in effective separation of light induced electrons and holes, providing a promising photoanode for its wide absorption spectrum, high electron injection efficiency, and fast electron transference. Under UV-vis irradiation, both CdS and TiO2 are excited. Under visible light irradiation, photons are captured by CdS QDs, with the photogenerated electron–hole pairs rapidly separated into electrons and holes at the interface between TiO2 and CdS QDs. In addition to this, more photoelectrons are generated from TiO2 by harvesting UV photons. TiO2 collects the photoelectrons from CdS and passes them through to the back contact. The holes (from both CdS and TiO2) generated in the process are transferred to the solid–liquid interface. Under one sun illumination, the solar cells based on CdS QDs/TiO2 hierarchical heterojunction nanocomposites with a smaller average size of 7.6 nm for CdS QDs show a maximum short circuit current density of 6.09 mA cm−2 and a conversion efficiency of 3.06%. The performance improvement of the solar cells based on CdS QDs/TiO2 hierarchical nanostructures can be attributed to the unique microstructure characteristics and the bandgap energy matching between the CdS QDs and TiO2.
✓ 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）