检索结果-南通市图书馆

Effect of hole-transporting materials on the photovoltaic performance and stability of all-ambient-processed perovskite solar cells

引用

Journal of Energy Chemistry 2017年第3期26卷 584-591页

作者： Nanaji Islavath S Saroja K Srinivas Reddy P C Harikesh G Veerappan Shrikant V Joshi Easwaramoorthi Ramasamy centre for Solar Energy materials International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI)Hyderabad 500005India

High-efficiency perovskite solar cells（PSCs） reported hitherto have been mostly prepared in a moisture and oxygen-free glove-box atmosphere, which hampers upscaling and real-time performance assessment of this exciting photovoltaic technology. In this work, we have systematically studied the feasibility of allambient-processing of PSCs and evaluated their photovoltaic performance. It has been shown that phasepure crystalline tetragonal MAPbI;perovskite films are instantly formed in ambient air at room temperature by a two-step spin coating process, undermining the need for dry atmosphere and post-annealing.All-ambient-processed PSCs with a configuration of FTO/TiO;/MAPbI;/Spiro-OMeTAD/Au achieve opencircuit voltage（990 mV） and short-circuit current density（20.31 mA/cm;） comparable to those of best reported glove-box processed devices. Nevertheless, device power conversion efficiency is still constrained at 5% by the unusually low fill-factor of 0.25. Dark current–voltage characteristics reveal poor conductivity of hole-transporting layer caused by lack of oxidized spiro-OMe TAD species, resulting in high seriesresistance and decreased fill-factor. The study also establishes that the above limitations can be readily overcome by employing an inorganic p-type semiconductor, copper thiocyanate, as ambient-processable hole-transporting layer to yield a fill-factor of 0.54 and a power conversion efficiency of 7.19%. The present findings can have important implications in industrially viable fabrication of large-area PSCs.

关键词： Perovskite Ambient processing Solar cell Hole transport Series resistance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

3,3'-二硫代二丙酸作为锂硫电池功能电解质添加剂的研究

引用

Journal of Central South University 2024年第2期31卷 431-442页

作者：邵诗宇贺亮张际为李思敏洪波张凯李劼 School of metallurgy and Environment Central South UniversityChangsha 410083China Engineering research centre of the Ministry of Education for Advanced Battery materials Changsha 410083China

锂硫电池由于其高理论容量、高能量密度以及较低的原料价格,被认为是目前最具潜力的储能电池之一。但是在实际应用中,锂硫电池的发展受到充放电过程中的“穿梭效应”和低活性材料利用率等的限制。本文探究了一种新型电解质添加剂3,3′-... 详细信息

锂硫电池由于其高理论容量、高能量密度以及较低的原料价格,被认为是目前最具潜力的储能电池之一。但是在实际应用中,锂硫电池的发展受到充放电过程中的“穿梭效应”和低活性材料利用率等的限制。本文探究了一种新型电解质添加剂3,3′-二硫代二丙酸(DTPA)对锂硫电池电化学性能提高的影响机制。结果表明,DTPA添加剂能与分散在电解液中的多硫化物相互作用,促进长链多硫化物转化为Li2S2和Li2S,从而缓解长链多硫化物向阳极的穿梭行为,提高氧化还原动力学和活性物质的利用率。添加DTPA后,锂硫电池的电化学性能得到了提高,在0.5C下,使用了1.5 wt.%DTPA作为电解液添加剂的锂硫电池初始循环容量为1093.4 mA·h/g,经过250次循环后容量为714.8 mA·h/g。此外,含DTPA的电池具有更高的电化学稳定性,其在2C下相对于0.1C的容量保持率为57.5%。本文的研究结果证明,DTPA作为电解质添加剂对锂硫电池的性能提高具有显著效果,为减少多硫化物的穿梭效应以增加锂硫电池的容量提供了一种可行的解决方案。

关键词：锂硫电池 3,3′-二硫代二丙酸多硫化物转化穿梭效应电解质添加剂

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Decomposition behavior of titanium hydride treated by surface oxidation

引用

Rare Metals 2015年第1期34卷 28-33页

作者： Hong-Jie Luo Hao Lin Pei-Hong Chen Guang-Chun Yao School of materials and metallurgy Northeastern University Engineering Technology research centre of Ministry of Education for materials Advanced Preparation

Titanium hydride attracts more attention as foaming agent in the fabrication of cellular metal materials. In order to meet most aluminum casting alloy＇s melting properties, the heat treatment processes for Till2 particles were investigated in a rotating device. In the present work, the most two important dynamic parameters, the treating temperature and oxidation interval, were taken under consideration. The decomposition behavior of titanium hydride was measured by differential scanning calorimetry （DSC） and the residual hydrogen content, morphologies and phase conversion were also characterized by hydrogen determinator, scanning electron microscopy （SEM）, and X-ray diffractometer （XRD）, respectively. The results show that the effect of temperature on the formation of oxidation film and decomposition behavior of Till2 is more significant than that of oxidation time. The onset temper- ature and peak value of Till2 decomposition shift from left to right through elevating temperature and extending time. Heat treatment process for Till2 at 500 ℃ between 1 and 5 h in air is favorable for preparing aluminum foam.

关键词： Titanium hydride Oxidation treatment Thermal decomposition Aluminum foam

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Factors Influencing the Direct Electrochemical Reduction of Nb_2O_5 Pellets to Nb Metal in Molten Chloride Salts

引用

Acta Metallurgica Sinica(English Letters) 2017年第3期30卷 218-227页

作者： D.Sri Maha Vishnu N.Sanil K.S.Mohandas K.Nagarajan Chemistry Group Indira Gandhi Centre for Atomic Research materials Chemistry Group Department of Materials Science and MetallurgyUniversity of Cambridge

Powder compacted and sintered Nb205 pellets were cathodically polarised against graphite anode in calcium chloride melt at 1173 K to study the influence of various factors on the electrochemical reduction of the oxide. The parameters were; duration and temperature of electrolysis, open porosity of pellets, nature of anode, mode of electrolysis and configuration of the oxide cathode. The experiments were also conducted in KC1, KC1-25 tool% CaC12 and NaC1 melts to understand the effect of melt composition on the electroreduction. Different Ca-Nb-O and Nb-O intermediates were found in the pellets electrolysed for different durations of time in CaC12 melt which eventually reduced to Nb. The current efficiency of the process decreased with increasing duration of electrolysis. Decrease in electrolysis temperature from 1 173 to 1073 K led to the decrease in the rate of reduction of the oxide pellets. Pellets with high open porosity reduced faster. Carbon contamination of the melt was relatively less when pyrolytic graphite was used as anode. Of all the melts studied, the reduction was found to be better in calcium chloride melt, that too when alumina crucible was used as container of the melt.

关键词： Fray-Farthing-Chen （FFC） Cambridge process Electrochemical reduction Open porosity Niobium pentoxide Calcium chloride

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于水添加剂策略调控前驱体溶液化学制备效率超过12%的CZTSSe太阳电池

引用

Science China materials 2023年第3期66卷 895-902页

作者：赵祥云潘逸宁刘丝靓蒋良兴赖延清刘芳洋 School of metallurgy and Environment Hunan Province Key Laboratory of Nonferrous Value-Added MetallurgyCentral South UniversityChangsha 410083China Engineering research centre of Advanced Battery materials the Ministry of EducationChangsha 410083China

高质量的吸收层对制备高效率Cu2ZnSn(S,Se)4(CZTSSe)薄膜太阳电池来说至关重要.与薄膜成核和晶体生长过程相关的前驱体溶液化学值得深入研究,从而有助于提出创造性的原理和策略来提高吸收层的质量和载流子传输特性,进而提升器件性能.然... 详细信息

高质量的吸收层对制备高效率Cu2ZnSn(S,Se)4(CZTSSe)薄膜太阳电池来说至关重要.与薄膜成核和晶体生长过程相关的前驱体溶液化学值得深入研究,从而有助于提出创造性的原理和策略来提高吸收层的质量和载流子传输特性,进而提升器件性能.然而,前驱体溶液化学的相关研究在CZTSSe太阳电池领域仍处于起步阶段.本工作报道了一种简便的环保添加剂策略来调控基于乙二醇甲醚体系的前驱体溶液化学.加入水添加剂可通过调整前驱体溶液内的溶胶粒径和配位行为来改善前驱体溶液的均一性和热重特性.成功对前驱体溶液化学进行调控后,得到了高质量的CZTSSe吸收层.在此基础上,得益于载流子动力学的增强,最终获得了认证效率达到12.07%的CZTSSe器件.本研究为通过环保添加剂调控前驱体溶液化学从而制备高效率锌黄锡矿CZTSSe薄膜太阳电池开辟了道路.

关键词：薄膜太阳电池吸收层晶体生长过程载流子动力学载流子传输乙二醇甲醚均一性锌黄锡矿

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Leaching kinetics in cyanide media of Ag contained in the industrial mining-metallurgical wastes in the state of Hidalgo, Mexico

引用

International Journal of Mining Science and Technology 2014年第5期24卷 689-694页

作者： Juan Hernandez Francisco Patino Isauro Rivera Iván Alejandro Reyes Misrael Uriel Flores Julio Cesar Juarez Martín Reyes Research Centre in Materials and Metallurgy Autonomous University of Hidalgo Pachuca 42184 Mexico

The leaching kinetics in cyanide media of the silver contained in the Dos Carlos waste tailings at the City of Pachuca de Soto, Hidalgo State, Mexico were carried out. The used material contained the following chemical composition: 56 10-6of Ag, 0.6 10 6of Au and 70.43%(by weight) of SiO2; 7.032%(by weight) of Al2O3; 2.69%(by weight) of Fe; 0.46%(by weight) of Mn; 3.98%(by weight) of K2O; 3.34%(by weight) of CaO; 2.50%(by weight) of Na2O; 0.04%(by weight) of Zn; 0.026%(by weight) of Pb. The mineralogical phases present were the following: Silica, albite, argentite, berlinite, orthoclase, potassium jarosite, and natrojarosite. In the leaching kinetics in cyanide media, and under the studied conditions,the effect of the CN concentration on the reaction rate has no effect on the whole process of alkaline cyanidation, of which the reaction order is n 0. Temperature has an effect on the cyanidation rate of the reaction, with an activation energy of 47.9 KJ/mol. At the same time, when the particle size decreases there is an increase in the reaction rate, which is inversely proportional to the particle diameter; when increasing the NaOH concentration there is an increase in the reaction rate Kexp, with a reaction order(n) of 0.215 under the studied ranges.

关键词：氰化物浸出浸出动力学墨西哥银矿冶金废物媒体反应速率采矿

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Fabrication of ceramic coatings on the biodegradable ZM21 magnesium alloy by PEO coupled EPD followed by laser texturing process

引用

Journal of Magnesium and Alloys 2021年第3期9卷 910-926页

作者： Hariprasad Sampatirao Saikiran Amruthaluru Premchand Chennampalli Rama Krishna Lingamaneni Rameshbabu Nagumothu Department of Metallurgical and materials Engineering National Institute of TechnologyTiruchirappalli 620015India centre for Engineered Coatings International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI)Hyderabad 500005India

Zirconia(ZrO_2)incorporated ceramic coatings were fabricated on biodegradable ZM21 Mg alloy by the PEO coupled with EPD process.Subsequently,the sample surface was modified by laser texturing to improve the corrosion resistance,roughness and cell proliferation and growth properties.The corrosion performance of the fabricated samples along with the substrate was studied by electrochemical measurements under simulated body fluid(SBF)environment.The cell direct contact assay was conducted for the substrate and fabricated samples using L-929 mouse fibroblast cells for 24 h.The phase contrast images of cell direct contact assay revealed that fabricated samples exhibited better contact and response with the fibroblast cells,compared to the substrate.The addition of nanoparticles in the PEO process,called PEO coupled EPD process,resulted in attaining a higher thickness and improved corrosion performance of the samples than the PEO coated samples.Among all the samples,laser surface textured PEO,and PEO-EPD coated samples unveiled enhanced corrosion resistance,cell growth,thereby enabling it as a suitable prototype for biodegradable implant applications.

关键词： ZM21 ZrO_(2)nanoparticle PEO-EPD Laser texturing Corrosion resistance L-929 cells

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Role of Double Oxide Film Defects in the Formation of Gas Porosity in Commercial Purity and Sr-containing Al Alloys

引用

Journal of materials Science & Technology 2014年第2期30卷 154-162页

作者： Batool Farhoodi Ramin Raiszadeh Mohammad-Hasan Ghanaatian Department of metallurgy and materials Science and Mineral Industries research centre Shahid Bahonar University of Kerman

The role of double oxide film （bifilm） defects in the formation of gas porosity in commercial purity and Srcontaining AI alloys was investigated by means of a reduced pressure test （RPT） technique. The liquid metal was poured from a height into a crucible to introduce oxide defects into the melt. The melt was then subjected to different ＂hydrogen addition＂ and ＂holding in liquid state＂ regimes before RPT samples were taken. The RPT samples were then characterized by determining their porosity parameters and examining the internal surfaces of the pores formed in them by scanning electron microscopy. The results indicated oxide defects as the initiation sites for the growth of gas porosity, both in commercial purity and Sr-containing AI alloys. The results also rejected reduction of the surface tension of the melt, increase in the volumetric shrinkage and reduction in interdendritic feeding as the possible causes of an increase in the porosity content of the AI castings modified with strontium. The change in the composition of the oxide layers of double oxide film defects was suggested to be responsible for this behaviour.

关键词： Double oxide film defects Bifilm Strontium Modification Porosity Aluminium casting

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Response of Photonic Hydrogels of Homogeneous Particles to Uranyl Ions in Aqueous Solutions

引用

Photonic Sensors 2023年第4期13卷 50-61页

作者： R.G.JOSHI Deepak K.GUPTA P.AMESH P.K.PARIDA T.R.RAVINDRAN materials Science Group Indira Gandhi Centre for Atomic ResearchA CI of Homi Bhabha National InstituteKalpakkam 603102India materials Chemistry and Metal Fuel Cycle Group Indira Gandhi Centre for Atomic ResearchA CI of Homi Bhabha National InstituteKalpakkam 603102India metallurgy and materials Group Indira Gandhi Centre for Atomic ResearchA CI of Homi Bhabha National Institute(HBNI)Kalpakkam 603102India

We study here the response of photonic hydrogels(PHs),made of photonic crystals of homogeneous silica particles in polyacrylamide hydrogels(SPHs),to the uranyl ions 22 UO_(2)^(2+) in aqueous solutions.It is found that the reflection spectra of the SPH show a peak due to the Bragg diffraction,which exhibits a blue shift in the presence of 22 UO_(2)^(2+).Upon exposure to the SPH,22 UO_(2)^(2+)gets adsorbed on the SPH and forms complex coordinate bonds with multiple ligands on the SPH,which causes shrinking of hydrogel and leads to the blue shift in the diffraction peak.The amount of the blue shift in the diffraction peak increases monotonically up to 22 UO_(2)^(2+)concentrations as high as 2300μM.The equilibration time for the shift in the Bragg peak upon exposure to 22 UO_(2)^(2+)is found to be~30 min.These results are in contrast to the earlier reports on photonic hydrogels of inhomogeneous microgel particles hydrogel(MPH),which shows the threshold 22 UO_(2)^(2+)concentration of~600μM,below which the diffraction peak exhibits a blue shift and a change to a red shift above it.The equilibration time for MPH is~300 min.The observed monotonic blue shift and the faster time response of the SPH to 22 UO_(2)^(2+)as compared to the MPH are explained in terms of homogeneous nature of silica particles in the SPH,against the porous and polymeric nature of microgels in the MPH.We also study the extraction of 22 UO_(2)^(2+)from aqueous solutions using the SPH.The extraction capacity estimated by the arsenazo-III analysis is found to be 112 mM/kg.

关键词： Photonic hydrogels uranium extraction and monitoring arsenazo-Ⅲ-uranium complex polyacrylamide hydrogel UV-visible spectroscopy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

微弧氧化处理对AA7075铝合金在3.5%NaCl溶液中局部腐蚀行为的影响(英文)

引用

Transactions of Nonferrous Metals Society of China 2012年第3期22卷 700-710页

作者： A.VENUGOPAL Rajiv PANDA Sushant MANWATKAR K.SREEKUMAR L.RAMA KRISHNA G.SUNDARARAJAN Material Characterization Division Materials and Metallurgy GroupVikram Sarabhai Space CentreThiruvananthapuram-695022India International Advanced research centre for Powder metallurgy and New materials Hyderabad-500005India

采用微弧氧化法在AA7075铝合金上生成氧化铝膜层,并对氧化铝膜层在3.5%NaCl溶液中的腐蚀和应力腐蚀开裂行为进行测试。采用电化学阻抗谱来研究膜层随浸泡时间的变化,构建合适的等效电路图。对常载荷应力腐蚀开裂测试后的试样进行金相观... 详细信息

采用微弧氧化法在AA7075铝合金上生成氧化铝膜层,并对氧化铝膜层在3.5%NaCl溶液中的腐蚀和应力腐蚀开裂行为进行测试。采用电化学阻抗谱来研究膜层随浸泡时间的变化,构建合适的等效电路图。对常载荷应力腐蚀开裂测试后的试样进行金相观察。结果表明,微弧氧化膜可以有效避免富Cu、Fe金属间化合物相引发的严重局部腐蚀而导致的合金过早失效。

关键词：铝合金微弧氧化阻抗谱应力腐蚀

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：