新型超级电容器电极材料NaxCo2O4的制备及电性能研究

采用溶胶凝胶法制备得到NaxCo2O4(x=1.0、1.2、1.4、1.6、1.8和2.0)样品,并首次将其应用于超级电容器电极材料;经XRD、SEM和电性能研究得出,制备出的NaxCo2O4晶体均为层状结构,x=1.6时样品电容性能最好,在6mol/LNaOH电解液中,0.25~0.7V电压范围内,以50mA/g的电流密度进行恒流充放电,比电容高达413F/g。     

Ni掺杂Na1.6Co2O4新型超级电容器电极材料的电性能研究

首次将掺杂镍离子的Na1.6Co2O4材料用作超级电容器的电极材料,并进行了XRD、SEM的表征和恒流充放电、循环伏安的电性能研究,发现掺杂3%(摩尔分数)Ni 2+的Na1.6Co2O4电极材料比纯的Na1.6Co2O4具有更优异的循环性能。     

Ce掺杂Ca3Co4O9的高温热电性能

利用二次固相反应方法制备了Ce掺杂的Ca3Co4O9热电材料(CexCa3-xCo4O9,x=0、0.1、0.3),并测试了样品的微观结构和高温热电性能。测试结果表明,Ce替代Ca可有效调制Ca3Co4O9的热电参数;随着温度的升高,样品的电阻率和热导率降低,See-beck系数增大。在973K的温度下,Ce0.1Ca2.9Co4O9具有最高的热电性能(ZT=0.23)。     

水热法制备CoFe2O4/石墨烯复合物及其电化学性能

本研究采用水热法制备了质量比为2∶1的CoFe2O4/石墨烯(CoFe2O4/graphene)复合物,利用XRD、FT-IR和TEM对样品的结构和形貌进行了表征,采用循环伏安法(CV)和恒电流充放电测试研究了其电化学性能。结果表明,CoFe2O4均匀的分布在石墨烯表面,粒径大约为10nm。在0.5A/g的电流密度下,比电容为105F/g。1000次循环后,电容保持率在90%以上。     

超级电容器用（RuO2/Co3O4）·nH2O复合薄膜电极的制备及其性能

配制RuCl3.3H2O和Co(CH3COO)2的异丙醇混合溶液,采用原位热分解法制备了超级电容器用(RuO2/Co3O4).nH2O复合薄膜电极.借助扫描电镜、X射线衍射仪、红外光谱仪、电化学分析仪等表征薄膜的微观形貌、物相转变以及电化学性能.结果表明,当涂覆液中n(Ru3+):n(Co2+)=1:3时,复合薄膜经260℃热处理3h达到最佳的综合性能,比电容为569F/g,附着力为22.4MPa,内阻仅为0.42Ω,1000次充放电循环后比电容保持在初始电容量的97.6%.     

La0.6Sr0.15Na0.1□0.15MnO3+xAgNO3复合体系的结构、磁性及磁电阻的温度稳定性研究

采用固相反应法制备了La0.6Sr0.15Na0.1□0.15MnO3+xAgNO3(x=0.08、0.16、1.00,x为物质的量比,□代表空位)系列复合材料样品,对复合样品的相结构、磁性质及其磁电阻效应进行了研究。通过相结构的研究发现:复合样品近似呈现La0.6Sr0.15Na0.1□0.15MnO3/Ag/Mn3O4的特殊复合结构。通过对磁电阻的研究发现:复合样品不同程度地提高了母体样品的MR峰值,降低了峰值温度,使其更接近室温。在204～280K的温度范围内和1.8T外磁场作用下,当x=0.08时,MR保持在(4.70±0.25)%;x=0.16时,MR保持在(7.20±0.28)%。所以,复合样品较之母体样品,磁电阻的温度稳定性有了很大提高。     

草酸盐共沉淀法合成锂离子电池LiNixMn0.8-xCo0.2O2（x=0.4,0.5）正极材料及电化学性能

采用草酸盐共沉淀法,结合高温固相反应法,合成了LiNix Mn0.8-x Co0.2O2(x=0.4,0.5)粉末材料,考察了焙烧时间和镍含量对LiNix Mn0.8-x Co0.2O2(x=0.4,0.5)结构与性能的影响。采用XRD、SEM和电池充放电测试方法等表征了材料的结构与性能。结果表明,800℃焙烧20h制备的LiNi0.5Mn0.3Co0.2O2具有良好的层状结构和综合电化学性能,阳离子混排程度小、六角晶格有序性好。0.2C倍率首次入放电容量为151mAh/g,循环20次后放电容量为148.4mAh/g。SEM结果表明LiNi0.5Mn0.3Co0.2O2是由0.5μm的一次颗粒组成,LiNi0.4Mn0.4Co0.2O2材料由0.5μm的一次颗粒团聚而成约8μm的二次颗粒组成。     

Co3O4/石墨烯复合物的水热合成及其超级电容器性能

采用水热法制备了Co3O4/石墨烯复合物,用XRD、FTIR和TEM测试了样品的结构和形貌,采用循环伏安法(CV)、交流阻抗和恒电流充放电测试分别研究了Co3 O4/石墨烯复合物电极的电化学性能.结果表明:石墨烯的掺入增加了Co3O4作为电极材料的可逆性,并降低了Co3O4纳米粒子与电解液的接触电阻和Warburg扩散阻抗.在6mol/L的KOH电解液中,复合物的比电容高达562F/g,1000次循环后比电容仅仅下降了2.6％.     

Ag、La双掺杂对Ca3Co4O9热电性能的影响

采用固相反应法,在常压空气中烧结制备出了(Ca1-x-yAgxLay)3Co4O9(x=0、0.1,y=0;x=0.1,y=0.02、0.04、0.06)系列块体样品;通过X射线衍射和扫描电镜对样品的物相组成和微观结构进行了表征;研究了Ag、La双掺杂对样品热电性能参数Seebeck系数、电阻率和热导率的影响。结果表明,双掺杂可以进一步提高材料热电性能,且掺杂浓度的选择对热电性能有较大的影响;在873K时,x=0.1,y=0.02样品的ZT值最大。     

Co3O4电化学电容电极材料的制备及性能研究

利用水热法,以硝酸钴为原料,分别以碳酸氢铵、六次甲基四胺为沉淀剂,制备了Co3O4。借助X射线衍射、扫描电子显微镜手段对样品进行表征。以六次甲基四胺为沉淀剂制得的Co3O4,在6 mol.L-1KOH水溶液中,电位窗口为0～0.4V内,通过循环伏安和恒流充放电测试,显示该材料制备的电极具有良好的电容行为。充放电流在为5 mA时,单电极的比容量达到239 F.g-1,是以碳酸氢铵为沉淀剂制得的Co3O4电极的1.57倍,说明以六次甲基四胺为沉淀剂制备的Co3O4具有较好的电化学电容性能。     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.     

新闻(英文)

正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to     

Win-Win Cooperation

正The Chinese Premier Li Keqiang's recent trip to the UK has reinforced the China-UK comprehensive strategic partnership;just as the British Prime Minister David Cameron put it,"the relationship is gaining in strength,depth and understanding"after a bucket of business deals being inked worth more than 30 billion US dollars.From the first agreement signing in 2004 to the new agreement of mutual standards recognition and adoption in     

Systematic Approach for Emerging Industry

正A national directory of standards complexes for strategic emerging sectors was recently developed and released jointly by 12governmental departments,namely,SAC,NDRC,MOST,MIIT,MEP,MOA,AQSIQ,State Forest Administration,State Administration of Science and Technology for National Defense,State Oceanic Administration and National Railway Administration.     

Strictest Pollutants Emission Standards

正Four new national standards on air pollutant emission control offi cially issued by the Ministry of Environment Protection(MEP)together with AQSIQ and SAC has been brought into force from July 1,2014.The Emission standard for air pollutants of coal-burning,oil-burning and gasfi red boilers,which is the strictest emission standard historically,will tackle the stubborn pollution problem of boilers and waste incineration in most of China’s regions.     

Instructions to Authors

New Carbon Materials is a bimonthly journal published with the permission of the Ministry of Science and Technology and of the State News and Publication Agency.The journal is sponsored by the Institute of Coal Chemistry,Chinese Academy of Sciences,and is published by Science Press.Aims and Scope     

Progress on Standards Copyright Protection

正Recently,National Copyright Administration of China(NCAC)has rewarded 215 organizations and 179 individuals for their outstanding efforts on investigating standards copyright infringement and piracy in 2013.Hua Jianhua,the Deputy-Director of National Standards Copyright Protection Workgroup Office won a third prize of the national individual award.In 2012,SAC set up the national standards copyright protection working group,and developed policies to crack down standards infringement and piracy behaviors and to strengthen standards copyright protection.