ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yaoyu Ren,Yang Shen,Yuanhua Lin,Ce-Wen Nan
Al-contained Li7–xLa3Zr2–xTaxO12 (xTa-LLZO) powder was synthesized via solid-state reaction, where increasing the Ta doping level was found to reduce the average particle size and facilitate a higher relative density in the sintered pellet. 0.8Ta-LLZO pellets sintered at 1150 °C achieved a relative density of 96.2 ± 0.2% and survived the Li striping/plating test under a unidirectional current polarization of 0.5 mA/cm2 for more than 8 h without short-circuiting. In contrast, other xTa-LLZO sintered pellets with lower Ta doping levels were short-circuited by lithium dendrites after polarization for much shorter time periods. The microstructure of the sintered body played a more essential role in lithium dendrite prevention compared to relative density alone. By characterizing the microstructure of xTa-LLZO sintered pellets, we proposed a formation mechanism of the pathways for lithium dendrite growth.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Fangzhou Zhou,Fangqin Zeng,Xu Liu,Fangyang Liu,Ning Song,Chang Yan,Aobo Pu,Jongsung Park,Kaiwen Sun,Xiaojing Hao
Back contact modification plays an important role in improving energy conversion efficiency of Cu2ZnSnS4 (CZTS) thin film solar cells. In this paper, an ultrathin carbon layer is introduced on molybdenum (Mo)-coated soda lime glass (SLG) prior to the deposition of CZTS precursor to improve the back contact and therefore enhance CZTS solar cell efficiency. By introducing this layer, the short circuit current (Jsc) and device conversion efficiency increase for both nonvacuum (sol–gel) and vacuum (sputtering) methods. Specifically, for the sol–gel based process, Jsc increases from 13.60 to 16.96 mA/cm2 and efficiency from 4.47% to 5.52%, while for the sputtering based process, Jsc increases from 17.50 to 20.50 mA/cm2 and efficiency from 4.10% to 5.20%. Furthermore, introduction of this layer does not lead to any deterioration of either open circuit voltage (Voc) or fill factor (FF).
研究领域:
材料科学
·
太阳能技术
·
薄膜电池研究
✓ 已验证
DOI
PubMed
高影响因子
Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 9
·2249-2255
·
IF 6.813
Zaimiao Zhang,Yaru Zheng,Nan Jiang,Wenqing Hong,Tianyu Liu,Hao Jiang,Yanjie Hu,Chunzhong Li
Electric energy harvesting from natural water evaporation has attracted great attention in the sustainable development of human society. However, ultra-low short-circuit current extremely hinders its widespread deployment. Herein, we report a high-performance wood-based hydroelectric generator (WHEG) based on highly conductive carbonized wood (C-wood) with abundant hydroxyls via a Lewis acid metal salt-catalyzed carbonization strategy. The high hydroxyl content greatly improves the zeta potential and the high electrical conductivity remarkably reduces the internal resistance, thus boosting the output of electrical energy from water evaporation. These advantages make the obtained WHEG (6.5 × 1.5 × 0.4 cm3) exhibit an open-circuit voltage of 96 mV and a remarkable short-circuit current of 10.5 μA under ambient conditions (45% RH, 25 °C), which is an order of magnitude higher than that of most previous studies. Furthermore, commercial electronics such as calculators and LEDs can be powered by the WHEG system in series or parallel connections.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN PHOTOVOLTAICS
·
2015
·Vol. 23
·期 12
·1828-1836
·
IF 7.584
Xinsheng Liu,Chao Chen,Liang Wang,Jie Zhong,Miao Luo,Jie Chen,Ding-Jiang Xue,Dengbing Li,Ying Zhou,Jiang Tang
Sb 2 Se 3 has attracted great research interest very recently as a promising absorber material for thin film photovoltaics due to its suitable bandgap, high absorption coefficient, and non-toxic, low cost, and earth abundant nature. In this work, a significant efficiency improvement to 4.8% of superstrate cadmium sulfide (CdS)/Sb 2 Se 3 solar cells is obtained by the controlled addition of oxygen during thermal evaporation of Sb 2 Se 3 films. Systematic materials and device physics characterization reveal that oxygen addition during Sb 2 Se 3 film evaporation significantly improves the CdS/Sb 2 Se 3 heterojunction quality through effective passivation of interfacial defect states, resulting in a substantial enhancement in device circuit voltage and short circuit current density. The 4.8% device is the highest efficiency thus far reported for Sb 2 Se 3 thin film solar cells. Copyright © 2015 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Erika Pavlikova,Tomas Plachy,Michal Urbanek,Martin Cvek
Carbonization is considered an effective process for the preparation of carbon-rich solids for various applications. Raw carbonaceous particles however often possess high electrical conductivity, limiting their applicability in electrorheology. To address this drawback, the carbonaceous particles prepared from glucose through hydrothermal synthesis, followed by thermal carbonization in an inert atmosphere, were subsequently coated by compact and mesoporous nanosilica, giving rise to semiconducting particles. The successful coating was confirmed using transmission electron microscopy and spectroscopic analysis, and the composite particles were further used as a dispersed phase in electrorheological (ER) fluids of concentration 5 wt %. While an ER fluid based on pure carbonized particles caused a short circuit of the measuring device at the electric field of intensity 1 kV mm–1, the ER behavior of its analogue based on mesoporous silica-coated particles was successfully measured up to 3 kV mm–1, giving a high yield stress exceeding even the values estimated for ER fluids based on similar carbonaceous particles coated with a compact silica layer. Even though the conductivity decreased only about one order of magnitude after the coating process, the dielectric properties of the prepared ER fluid differed significantly, the relaxation process was shifted to lower frequencies, and most importantly, the dielectric relaxation strength increased, indicating an increased amount of interactions. The presence of mesoporous nanosilica further enhanced the sedimentation stability of the ER fluids when compared to its analogue with the compact silica coating, expanding the scope of practical applicability.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 25
·19947-19957
·
IF 2.779
Zhang Yu-Rui,Gao Yuan,Zheng Quan-Hao,Zhang Ting-Ting,Qiu Li-Peng,Gao Shi-Long,Zhang Xue-Tong,Han Wen-Peng,Long Yun-Ze
This work reports the superior properties of flexible multi-functional composite fibers based on graphene aerogel fibers. With the addition of phase change materials, the graphene aerogel fibers were synthesized by wet spinning and supercritical drying. The phase change materials can improve the structural uniformity and thermal stability of the composite fibers. The fibers coated with polydimethylsiloxane and fluorocarbon can respond to various external stimuli (e.g., electrons, photons, and heat), as well as have excellent properties of shape compliance, self-cleaning, and insulated surfaces. After coating fluorocarbon, the maximum water contact angle of graphene aerogel fibers increases from 132.18° to 151.77°. It is worth mentioning that adding an insulation layer of polydimethylsiloxane avoids the high-temperature problem caused by the short circuit of graphene aerogel fibers. The short-circuit temperature of graphene aerogel fibers is as high as 65 °C, while that of the composite fiber is only 41.5 °C after coating with polydimethylsiloxane. The temperature of graphene aerogel fibers with polyethylene glycol can increase to 39.3 °C under simulated sunlight. In addition, graphene aerogel fibers have excellent electrical conductivity (4.85 × 10 3 S m −1 ) at 300 K. After coating with polyethylene glycol, its electrical conductivity is still as high as 2.95 × 10 3 S m −1 . The good electrical conductivity makes the aerogel fibers have promising application in advanced wearable systems.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 6
·1070-1076
·
IF 3.1
Liu Deye,Lu Yang,Li Xu,Liu Fengmin,Liu Xiaomin,Lu Geyu
I n this study, we synthesized a core-shell structure of up-conversion nanoparticles (UCNPs) and deposited it on the surface of fluorine-doped tin oxide (FTO). Subsequently, we assembled a series of perovskite solar cells with FTO/UCNPs/c-TiO 2 /mp-TiO 2 /MAPbI 3 /Spiro-OMeTAD/Au structures with an effective area of 0.04 cm 2 . To optimize the devices, we adjusted the concentration of UCNPs precursor. The optimized device showed a power conversion efficiency (PCE) of 16.73% and a short-circuit current density ( J sc ) of 26.94 mA/cm 2 at AM 1.5. These values are 9.20% and 10.47% higher than those of the best performing control device (15.32% for PCE and 24.12 mA/cm 2 for J sc ), respectively. Furthermore, we characterized the perovskite layer, charge transport layer, and perovskite solar cells using various analytical methods. The results showed that the addition of UCNPs not only improved the charge extraction and transfer, but also enhanced the stability of electron transport layer devices. In conclusion, our findings offer a process for optimizing perovskite cells using UCNPs and preliminarily analyzing their principles.
研究领域:
材料科学
·
能源研究
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2013
·Vol. 1
·期 2
·471-475
·
IF 0
Ze Zhong,Jian Liu,Zhi Yuan Xie,Zhi Yuan Wang
Graphical A stacked bilayer of phenyl-grafted graphene oxide (P-GO) and a donor material with high hole-transfer mobility is induced as interfacial bilayer in OPV cells between the active materials and anode. Single-layer P-GO acts as interfacial material and the donor material as a partition layer. This interfacial bilayer can minimize exciton quenching and inverse current, thus increasing J sc , which significantly improves the performance of OPV cells. A solution-processable interfacial bilayer is found to be able to significantly increase a short-circuit current and thus the overall performance of bulk heterojunction organic photovoltaic cells. The interfacial bilayer is comprised of surface-modified single-layer graphene oxide and a donor polymer. The use of the interfacial bilayer can minimize exciton quenching and inverse current and does not alter the energy level of photovoltaic devices, which is also applicable to other organic optoelectronic diode devices.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Peng Chen,Gang He,Bo He,Yujiao Li,Can Fu,Shanshan Jiang,Qian Gao
Moist-electric power generation is an emerging energy technology that collects energy from the environment and converts it into electrical energy through the interaction of moisture with materials. Although most of the moist-electric generators (MEGs) have achieved continuous breakthroughs in open-circuit voltage ( V OC ) and duration at present, it has been proven to be a challenge to maintain a continuous relatively high short-circuit current ( I SC ). Herein, electrospun nanofiber-based Janus heterogeneous film with both moisture absorption and moisture evaporation characteristics is prepared, and excellent power output performance MEGs have been fabricated by setting perforated electrode at each side respectively. Results have demonstrated the Janus nanofiber moist-electric generator (JFMEG) can generate a V OC of 0.6 V with a continuous power generation time of up to 30 d and a maximum I SC of about 44 μA cm −2 at 95% relative humidity. In addition, the I SC maintenance time above 10 μA cm −2 is close to 40 h. The integrated device can power commercial equipment and can be used for self-powered breath detection. Additionally, the self-powered field-effect transistor by JFMEG has been fabricated, demonstrating excellent output characteristics. The detailed working mechanism of JFMEG and the influencing factors of power generation performance are systematically analyzed, which can provide reference for the performance improvement of similar moist-electric devices.
研究领域:
能源材料科学
·
纳米技术
·
环境能源
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2020
·Vol. 7
·期 17
·3656-3662
·
IF 4.154
Shufeng Song,Xinjie Tan,Yanfang Zhai,Guanming Yang,Jianyao Yao,Shuai Li,Ning Hu,Xueli Qi,Ru Li,Wandong Ma,Zhaoyin Wen,Li Lu
Graphical Must gel polymer electrolyte membranes be porous? Ultrathin and compacted gel polymer electrolyte with robust chemical interaction between SiO 2 nanoparticles and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) chains enables a wide electrochemical stability window and excellent cycling stability. Batteries with lithium metal as anodes and gel polymer membranes as electrolytes are promising, because of their high energy densities and improved safety. To achieve metal battery energy densities that are comparable to liquid-electrolyte batteries, ultrathin and lightweight gel electrolytes with wide electrochemical stability windows are desired. However, it is challenging to make gel polymer electrolyte membranes with comparable thicknesses to commercial polymer electrolyte separators (<20 μm), because of the porous configuration and increased risk of short-circuiting cells. Here, we report on a 10 μm-thick compacted gel polymer electrolyte (TCGPE), demonstrated to have a robust chemical interaction between SiO 2 nanoparticles and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) chains that are activated via an in situ sol-gel reaction. The developed TCGPE exhibits an extremely wide electrochemical stability window of 5.5 V vs. Li/Li + and prevents the batteries from short-circuiting even at a high current density of 1.0 mA cm −2 . Moreover, Li/TCGPE/LiNi 0.5 Co 0.2 Mn 0.3 O 2 shows an excellent capacity retention of 99.8 % after 180 cycles at 1 C rate.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 9
·3063-3071
·
IF 5.7
Haoyang Li,Hua Tang,Junsheng Yu,Jiang Cheng,Lu Li
Silver antimony sulfide (AgSbS2) is used as an absorption layer in thin film solar cells due to its suitable bandgap and economic considerations. Efforts have been made to improve the photovoltaic performance of devices, but it is difficult to increase the short circuit current (JSC) and open circuit voltage (VOC) simultaneously. We have designed a double-absorber solar cell based on AgSb(S,Se)2, whose structure is glass/ITO/CdS/AgIn0.5Sb(S,Se)2.75/AgSb1.25(S,Se)2.375/Au. Ultrasonic spray pyrolysis was used to prepare the films, and a selenization process was conducted to construct a gradient band structure. The two stacked absorbers have a total thickness of 1700 nm. The best performance obtained had a VOC of 0.396 V, a JSC of 17.04 mA cm−2, a fill factor (FF) of 52.78%, and an efficiency of 3.57%. The champion device had a double layer design with an 850 nm thickness of AgIn0.5Sb(S,Se)2.75 and an 850 nm thickness of AgSb1.25(S,Se)2.375 stacked from bottom to top. A high JSC, which was attributed to AgIn0.5Sb(S,Se)2.75, was achieved, and the VOC was almost maintained at the same level as that of AgSb1.25(S,Se)2.375. This strategy may provide a new approach to unravel the contradiction between high JSC and high VOC, which could be utilized in other solar cells.
研究领域:
材料科学
·
可再生能源
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 24
·21138-21144
·
IF 2.324
Zhu Wentao,Lv Yanqi,Chen Huanhuan,Yang Jiawei,Zhou Xingfu
TiO 2 nanorod arrays of crystalline Cd, Y-co-doped rutile were synthesized and successfully assembled in perovskite solar cells (PSCs) as the photoanode. In this work, CH 3 NH 3 PbI 3−x Cl x was used as the light absorber and spiro -OMeTAD as hole transport material (HTM). The synthesized TiO 2 nanorod arrays were investigated by field emission-scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRD) and UV–Vis diffused reflectance. FE-SEM images indicate that the co-doped TiO 2 nanorod arrays were slightly sparser and shorter in length than that of un-doped ones. XRD pattern demonstrates that the as-prepared TiO 2 nanorod arrays were rutile phase. The UV–Vis spectrum proves that the co-doped samples possess higher light scattering intensity than the un-doped samples, which may contribute to improve the short current density of PSCs. And the band gap of the TiO 2 nanorod shows a positive shift when doped with cadmium and ytterbium. Furthermore, a negative shift in the flat-band potential (V fb ) was also observed. Finally, the device based on co-doped TiO 2 nanorod arrays has improved open circuit voltage (V oc ) and short circuit current density (J sc ). A higher power conversion efficiency (η) of 9.06% was obtained for the co-doped device while 8.12% for the un-doped TiO 2 nanorod arrays. This paper opens a door to multi-element co-doped 1-D nanostructured materials for the improving the open circuit voltage and short circuit current density of perovskite solar cells.
研究领域:
材料科学
·
能源科学
·
光电化学
✓ 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）