AC/PEDOT复合材料的制备及电化学性能

采用原位聚合法,在活性碳(AC)颗粒上生长聚3,4乙烯二氧噻吩(PEDOT)来制备活性碳/聚3,4乙烯二氧噻吩(AC/PEDOT)超级电容器复合电极材料,并研究不同配比复合材料的电化学性能。采用X射线衍射、扫描电子显微镜及傅里叶红外等技术对样品进行表征,采用循环伏安、恒流充放电及交流阻抗等方法对样品进行了电化学性能测试。结果表明,AC与PEDOT的复合可大幅度提高比容量,当n(AC)∶n(PEDOT)=10∶1,电流密度为1A/g时,比容量可达250F/g,比AC的比容量提高了95.3%,经1 000次充放电后,电容保持率为80.4%,具有循环稳定性能好,低内阻0.29Ω等优点,有望实现碳基超级电容器的小型化。     

超级电容器用PEDOT/AC复合电极的制备及电化学性能

以对甲苯磺酸铁(Fe(TOS)3)为掺杂剂和氧化剂,采用化学聚合法制备了聚(3,4-乙撑二氧噻吩)/活性炭(PEDOT/AC)复合材料。通过SEM、FT-IR、TGA/DTG等方法分析了复合材料的微观形貌及结构特征。采用循环伏安、恒流充放电、交流阻抗等方法研究了不同配比的复合材料作为卷绕式超级电容器电极的电化学性能。结果表明,PEDOT/AC复合材料具有优良的热稳定性。当AC的含量为EDOT的20%时,复合电极的比容量提高到176.3F/g,经过1 000次恒电流充放电后,容量保持率为83.6%,具有优异的循环稳定性。     

聚3，4-乙烯二氧噻吩/纳米多孔金复合电极的制备及其在超级电容器中的应用

通过一步法将单体3,4-乙烯二氧噻吩(EDOT)电化学聚合到具有高导电率和大比表面积的纳米多孔金(NPG)上,成功制备了具有完美核壳结构的聚3,4-乙烯二氧噻吩/纳米多孔金（PEDOT/NPG）复合电极材料。通过SEM、TEM、Raman和X射线能谱仪对复合电极材料的形貌、微观结构、振动特性和元素组成进行了分析和表征。使用电化学工作站对其电化学性能进行了系统的研究。在三电极体系中,PEDOT/NPG复合电极材料在3 A/g的低电流密度下,质量比电容可以达到555 F/g,其能量密度和功率密度分别为177.58 W·h/kg和1.73 kW/kg。同时该电极材料经过2 000次循环伏安测试后仍然可以保持最大电容的91.5%,电化学性能优异。      

聚苯胺修饰活性炭电极电化学性能

采用循环伏安法在活性炭电极（AC）表面合成导电聚苯胺，得到聚苯胺修饰活性炭复合电极（PAn／AC），通过循环伏安（CV）、恒流充放电技术研究了电极的电容特性，并计算了其等效串联电阻。结果表明，在硫酸溶液中，复合电极呈现较好的电容特性，复合电极的比电容能达到545F／g，比纯活性炭电极的306F／g提高了78％，不同放电电流密度下求出的比电容比纯活性炭电极平均提高了89％，且复合电极的ESR比AC电极稍小。     

化学气相沉积导电聚合物复合纳米薄膜及性能

采用化学气相聚合法制备了聚-3,4-乙烯二氧噻吩(PEDOT)/还原氧化石墨烯(RGO)复合薄膜。首先用旋涂法制备氧化剂/氧化石墨烯(GO)薄膜,然后将薄膜置于3,4-乙烯二氧噻吩(EDOT)气相聚合装置中,形成PEDOT/GO复合薄膜。将获得的PEDOT/GO复合薄膜用葡萄糖还原剂进行处理,获得PEDOT/RGO复合薄膜。导电性测试表明,GO被还原后复合薄膜的电导率为35.3S/cm,明显高于PEDOT/GO(14.6S/cm)和纯PEDOT(17.3S/cm)薄膜的电导率。电化学特性研究表明,RGO的加入使得PEDOT/RGO导电聚合物复合纳米材料具有优良的电化学特性及稳定性,薄膜的比电容为176.7F/g。循环测试800次后,比容量保持率为84%,具有良好的电化学稳定性。这种化学气相聚合制备的聚合物复合纳米薄膜在超级电容器及导电材料领域有着很好的应用前景。     

导电剂对氧化钌基超级电容器电极材料性能的影响

采用液相共沉积法合成了RuO2/AC复合电极材料,用扫描电镜对不同导电剂材料的形貌进行表征,进而通过循环伏安法、恒流充放电、交流阻抗谱研究了不同导电剂对RuO2/AC复合电极材料超级电容器性能的影响。结果表明,在38%(质量分数)的H2SO4溶液中,电流密度为2 m A/cm2,以CNTs、AB、KS6、Super PLi为导电剂时比容量和ESR分别为689,556,574和512 F/g,0.19,0.36,0.32和0.41Ω。     

香蒲活性炭用于锂硫电池正极材料

通过香蒲绒的热解和KOH活化制备香蒲活性炭。香蒲活性炭的BET比表面积和孔容积分别为1 913. 7 m~2/g和0. 893 cm~3/g,主要为孔径约2 nm的微、介孔。当其用于锂硫电池正极时,碳基质的微介孔可以高度分散和负载非导电性硫,并有效持硫、抑制多硫化物的扩散;同时孔壁可以较快地进行电子输运。因此硫/香蒲活性炭复合材料具有较好的循环性能和倍率容量,0. 12C下首次放电容量可达1 150. 1 m Ah/g,100次循环后比容量为663. 3 m Ah/g。不同倍率测试表明,复合电极均具有较好的循环稳定性,1C下可逆容量约600 m Ah/g。     

超级电容器用聚苯胺／活性炭复合电极的研究

通过循环伏安法在多孔活性炭表面沉积了聚苯胺膜,并采用扫描电子显微镜、交流阻抗潜以及恒电流允放电技术对聚苯胺、活性炭和聚苯胺/活性炭复合电极进行了研究.结果显示:聚苯胺在活性炭表面形成一层由多孔网状结构组成的均匀的膜.聚苯胺/活性炭复合电极比活性炭电极具有更高的容量,同时比聚苯胺电极具有更好的循环稳定性.聚苯胺/活性炭复合电极的比电容为587F/g,而活性炭电极仅为140F/g.在50次充放电循环后,聚苯胺电极比电容从513降至334F/g,而聚苯胺/活性炭复合电极从415F/g下降为383F/g.     

单极脉冲法沉积聚3,4-乙烯二氧噻吩及其电容性能EI北大核心CSCD

聚3,4-乙烯二氧噻吩(PEDOT)因具有非常高的离子电导率而被广泛研究。文中以EDOT为单体,采用单极脉冲法在不锈钢片基底上制备了PEDOT膜电极。考察了不同脉冲参数对PEDOT膜超级电容的影响。通过扫描电子显微镜、傅里叶变换红外光谱表征PEDOT涂覆的不锈钢电极,确认了PEDOT由不规则的虚球体堆积成褶皱状结构,证实了Cl O4-成功掺杂于PEDOT膜中;通过循环伏安法、恒电流充电/放电和电化学阻抗谱得到:PEDOT电极展示出良好的比电容(128.64 F/g)、倍率性能和稳定性(循环2000次保留率达71.26%)。对于低成本、高性能的能量存储应用显示出相当大的潜力。     

掺锰活性炭的制备及其电化学性能

分别采用催化法和物理法制得含锰氧化物的中孔活性炭(AC-Mn)和普通活性炭(AC),表征了活性炭的孔容、孔径分布、碘值和亚甲兰值等主要结构、性能指标,并对以这两种活性炭为原料制得的电极进行循环伏安、定电流充放电和交流阻抗测定.结果表明:AC-Mn的收率和碘值分别比AC降低了28.9%和12.4%,但业甲兰吸附值提高了19.8%.AC-Mn的中孔率显著提高,其中3.4nm-4.2nm的中孔增长率最大.AC-Mn电极比电容达93.8F/g.比末负载金属Mn的AC电极高近140%,显示出相对较高的能量密度和良好的准电容特性.     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

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.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

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.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

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.