期刊文献+
共找到8篇文章
< 1 >
每页显示 20 50 100
SnSe的制备方法、热电性能及潜在应用 被引量:4
1
作者 冉宇通 陈文铎 朱宏伟 《中国激光》 EI CAS CSCD 北大核心 2021年第2期237-259,共23页
硒化锡(SnSe)具有极低热导率、高功率因子和高热电优值,是一种性能优异的热电材料。SnSe的热电性能与其结构和掺杂状态密切相关。从SnSe的基本特性出发,介绍了SnSe的典型制备方法,综述了SnSe的热电性能及光(热)电性能,讨论了SnSe在光伏... 硒化锡(SnSe)具有极低热导率、高功率因子和高热电优值,是一种性能优异的热电材料。SnSe的热电性能与其结构和掺杂状态密切相关。从SnSe的基本特性出发,介绍了SnSe的典型制备方法,综述了SnSe的热电性能及光(热)电性能,讨论了SnSe在光伏、锂离子电池、柔性热电器件及相变存储器等领域的潜在应用,总结了目前SnSe研究中存在的问题,并对提高其低温热电性能的方法进行了展望。 展开更多
关键词 材料 半导体材料 硒化锡 电性能 ()电性能
原文传递
Synthesis,characterization and gas-sensing properties of Pd-doped SnO_2 nano particles 被引量:1
2
作者 谭瑞琴 郭艳群 +3 位作者 赵俊华 李月 徐铁峰 宋伟杰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第7期1568-1573,共6页
SnO2 nano particles with various Pd-doping concentrations were prepared using a template-free hydrothermal method.The effects of Pd doping on the crystal structure,morphology,microstructure,thermal stability and surfa... SnO2 nano particles with various Pd-doping concentrations were prepared using a template-free hydrothermal method.The effects of Pd doping on the crystal structure,morphology,microstructure,thermal stability and surface chemistry of these nano particles were characterized by transmission electron microscope,X-ray diffractometer and X-ray photoelectron spectroscope respectively.It was observed that Pd-doping had little effect on the grain sizes of the obtained SnO2 nano particles during the hydrothermal route.During thermal annealing,Pd-doping could restrain the growth of grain sizes below 500℃ while the grain growth was promoted when the temperature increased to above 700℃.XPS results revealed that Pd existed in three chemical states in the as-synthesized sample as Pd^0,Pd^2+ and Pd^4+,respectively.Pd^4+ was the main state which was responsible for improving the gas-sensing property.The optimal Pd-doping concentration for better gas-sensing property and thermal stability was 2.0%-2.5% (mole fraction). 展开更多
关键词 SnO2 nano particles Pd-doping hydrothermal synthesis gas sensing property X-ray photoelectron spectroscopy
下载PDF
Laser-weldable Si_p-SiC_p/Al hybrid composites with bilayer structure for electronic packaging 被引量:6
3
作者 朱梦剑 李顺 +1 位作者 赵恂 熊德赣 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第4期1032-1038,共7页
Laser-weldable Sip-SiCp/Al hybrid composites with high volume fraction (60%-65%) of SiC reinforcement were fabricated by compression moulding and vacuum gas pressure infiltration technology. Microscopic observation ... Laser-weldable Sip-SiCp/Al hybrid composites with high volume fraction (60%-65%) of SiC reinforcement were fabricated by compression moulding and vacuum gas pressure infiltration technology. Microscopic observation displayed that the Sip-SiCp/Al hybrid composites with bilayer structure were compact without gas pores and the intergradation between Sip/Al layer and SiCp/Al layer was homogeneous and continuous. Further investigation revealed that the Sip-SiCp/Al hybrid composites possessed low density (2.96 g/cm^3), high gas tightness (1.0 mPa·cm^3)/s), excellent thermal management function as a result of high thermal conductivity (194 W/(m·K) and low coefficient of thermal expansion (7.0×10^-6 K-1). Additionally, Sip-SiCp/Al hybrid composites had outstanding laser welding adaptability, which is significantly important for electronic packaging applications. The gas tightness of components after laser welding (48 mPa·cm^3)/s) can well match the requirement of advanced electronic packaging. Several kinds of these precision components passed tests and were put into production. 展开更多
关键词 Sip-SiCp/Al hybrid composites laser welding thermo-physical properties electronic packaging
下载PDF
Highly Active and Stable Ni_2P/SiO_2 Catalyst for Hydrogenation of C_9 Petroleum Resin 被引量:7
4
作者 Jiang Lin Feng Feng +2 位作者 Jiang Dahao Guan Zhengyu Li Xiaonian 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2016年第1期36-43,共8页
Catalytic hydrogenation is an appropriate method for the improvement of C9 petroleum resin(C9PR) quality. In this study, the Ni2P/SiO2(containing 10% of Ni) catalyst prepared by the temperature-programmed reductio... Catalytic hydrogenation is an appropriate method for the improvement of C9 petroleum resin(C9PR) quality. In this study, the Ni2P/SiO2(containing 10% of Ni) catalyst prepared by the temperature-programmed reduction(TPR) method was used for hydrogenation of C9 petroleum resins. The effect of reaction conditions on catalytic performance was studied, and the results showed that the optimum reaction temperature, pressure and liquid hourly space velocity(LHSV) was 250 ℃, 6.0 MPa, and 1.0 h-1, respectively. The bromine numbers of hydrogenated products were maintained at low values(250 mg Br/100g) within 300h, showing the high activity and stability of Ni2P/SiO2 catalyst. The fresh and spent catalysts were characterized by X-ray diffraction(XRD), BET surface area(BET) analysis, scanning electron microscopy(SEM), transmission electron microscopy(TEM), Fourier transform infrared(FTIR) pyridine adsorption, and X-ray photoelectron spectroscopy(XPS). Compared with the traditional sulfurated-Ni W catalysts, Ni2P possessed globe-like structure instead of layered structure like the active phase of Ni WS, thereof exposing more active sites, which were responsible for the high activity of Ni2P/SiO2 catalyst. The stability of Ni2P/SiO2 catalyst was probably attributed to its high sulfur tolerance, antisintering, anti-coking and carbon-resistance ability. These properties might be further ascribed to the special Ni-P-S surface phase, high thermal stability of Ni2P nanoparticles and weak surface acidity for the Ni2P/SiO2 catalyst. 展开更多
关键词 Ni2P/SiO2 C9 petroleum resin catalytic hydrogenation high activity excellent stability
下载PDF
Preliminary Experimental Analysis of a CHP Hydromethane System
5
作者 Livio de Santolil Gianluigi Lo Basso Daniele Bruschi 《Journal of Energy and Power Engineering》 2013年第9期1681-1690,共10页
The aim of this paper is to present the preliminary experimental analysis results carried out on the commercial internal combustion engine set in a CHP (combined heat and power) mode, fueled by renewable hydrogen an... The aim of this paper is to present the preliminary experimental analysis results carried out on the commercial internal combustion engine set in a CHP (combined heat and power) mode, fueled by renewable hydrogen and methane mixtures. The hydrogen is produced by an alkaline electrolyser fed by a 5.8 kWp grid connected PV (photovoltaic) plant. The acceptance test conducted with hydrogen percentages ranging from 0%-10% has been carried out at partial load: 45 kW^l instead of the full power of 60 kWe~. In order to evaluate the CHP energy consumption and environmental performance (NOx and CO), the analysis was conducted for 240 h, using a portable flue gas analyser and two mass flow meters for hydrogen and methane. Without engine parameters optimization--relative equivalence ratio (2) and spark advance--increasing hydrogen addition rate, a slight enhancement in electrical efficiency occurs. Furthermore, due to the engine control system and lower blends LHV (lower heating value), the methane consumption decreases disproportionately to the hydrogen amount in the mixture. Finally, referring to standard operating condition, the environmental results show that using enrichment of 10%, running the engine with 18 degrees spark advance and 2 of 1.4, CO and NOx emissions are reduced by 6.3% and 27% respectively. 展开更多
关键词 CHP systems hydrogen-natural gas blends experimental analysis efficiency pollutants emission.
下载PDF
Complete thermoelectric benchmarking of individual InSb nanowires using combined micro-Raman and electric transport analysis 被引量:1
6
作者 Sara Yazji Eric A. Hoffman +7 位作者 Daniele Ercolani Francesco Rossella Alessandro Pitanti Alessandro Cavalli Stefano Roddaro Gerhard Abstreiter Lucia Sorba Ilaria Zardo 《Nano Research》 SCIE EI CAS CSCD 2015年第12期4048-4060,共13页
Nanowires (NWs) are ideal nanostructures for exploring the effects of low dimensionality and thermal conductivity suppression on thermoelectric behavior. However, it is challenging to accurately measure temperature ... Nanowires (NWs) are ideal nanostructures for exploring the effects of low dimensionality and thermal conductivity suppression on thermoelectric behavior. However, it is challenging to accurately measure temperature gradients and heat flow in such systems. Here, using a combination of spatially resolved Raman spectroscopy and transport measurements, we determine all the thermoelectric properties of single Se-doped InSb NWs and quantify the figure of merit ZT. The measured laser-induced heating in the NWs and associated electrical response are well described by a 1D heat equation model. Our method allows the determination of the thermal contact resistances at the source and drain electrodes of the NW, which are negligible in our system. The measured thermoelectric parameters of InSb NWs agree well with those obtained based on field-effect transistor Seebeck measurements. 展开更多
关键词 THERMOELECTRIC thermoelectric figure ofmerit Raman spectroscopy field-effect transistor measurements NANOWIRE INSB
原文传递
Quantum dot-sensitized solar cells employing Pt/C_(60) counter electrode provide an efficiency exceeding 2%
7
作者 YUE GenTian WU JiHuai +4 位作者 XIAO YaoMing LIN JianMing HUANG MiaoLiang FAN LeQing LAN Zhang 《Science China Chemistry》 SCIE EI CAS 2013年第1期93-100,共8页
A microporous platinum/fullerenes (Pt/C 60) counter electrode was prepared by using a facile rapid thermal decomposition method,and the quantum-dot sensitized solar cell (QDSSC) of Pt/C 60-TiO 2-CdS-ZnS and Pt/C 60-Ti... A microporous platinum/fullerenes (Pt/C 60) counter electrode was prepared by using a facile rapid thermal decomposition method,and the quantum-dot sensitized solar cell (QDSSC) of Pt/C 60-TiO 2-CdS-ZnS and Pt/C 60-TiO 2-CdTe-ZnS was fabrication.The technique forms a good contact between QDs and TiO 2 films.The photovoltaic performances of the as-prepared cells were investigated.The QDSSCs with Pt/C 60 counter electrode show high power conversion efficiency of 1.90% and 2.06%,respectively (under irradiation of a simulated solar light with an intensity of 100 mW cm 2),which is comparable to the one fabricated using conventional Pt electrode. 展开更多
关键词 counter electrode quantum dot microporous platinum/fullerenes solar cell
原文传递
Photogated proton conductivity of ZIF-8 membranes co-modified with graphene quantum dots and polystyrene sulfonate 被引量:2
8
作者 Shuaikang Fan Shilin Wang +5 位作者 Xiaobin Wang Zhuoyi Li Xu Ma Xinyi Wan Shabab Hussain Xinsheng Peng 《Science China Materials》 SCIE EI CAS CSCD 2021年第8期1997-2007,共11页
Smart proton conductive metal-organic framework(MOF) membranes with dynamic remote control over proton conduction show high potential for use in advanced applications, such as sensors and bioprocesses. Here, we report... Smart proton conductive metal-organic framework(MOF) membranes with dynamic remote control over proton conduction show high potential for use in advanced applications, such as sensors and bioprocesses. Here, we report a photoswitchable proton conductive ZIF-8 membrane by coencapsulating polystyrene sulfonate and graphene quantum dots into a ZIF-8 matrix(GQDs-PSS@ZIF-8) via a solidconfined conversion process. The proton conductivity of the GQDs-PSS@ZIF-8 membrane is 6.3 times higher than that of pristine ZIF-8 and can be reversibly switched by light due to photoluminescence quenching and the photothermal conversion effect, which converts light into heat. The local increase in temperature allows water molecules to escape from the porous channels, which cuts off the proton transport pathways and results in a decrease in proton conductivity. The proton conductivity is restored when the light is off owing to regaining water molecules, which act as proton carriers, from the surroundings. The GQDs-PSS@ZIF-8 membrane responds efficiently to light and exhibits an ON/OFF ratio of 12.8. This photogated proton conduction in MOFs has potential for the development and application of MOF-based protonic solids in advanced photoelectric devices. 展开更多
关键词 ZIF-8 graphene quantum dots photoswitchable proton conductivity photoluminescence quenching photothermal conversion
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部