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Mechanical design and analysis of a low beta squeezed half-wave resonator

HE Shou-Bo , ZHANG Cong , YUE Wei-Ming , WANG Ruo-Xu , XU Meng-Xin , WANG Zhi-Jun , HUANG Shi-Chun

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Two-step magnetization in a spin-chain system on the triangular lattice: Wang-Landau simulation

The Wang-Landau algorithm is used to study the thermodynamic and magnetic properties of triangular spin-chain system based on two-dimensional Ising model in order to understand the magnetic-order dynamics in Ca(3)Co(2)O(6) compound. The calculated results demonstrate that the equilibrium state of the rigid spins produces the two-step magnetization curve at low temperature even when the random-exchange term is considered. This work indicates that the four-step magnetization behavior observed experimentally must be due to the nonequilibrium magnetization.

关键词: calcium compounds;exchange interactions (electron);Ising model;magnetisation;thermodynamics;one-dimensional ca3co2o6;density-of-states;compound ca3co2o6;phase-diagram;proteins;crystal

RuO2含量对Ti/SnO2+Sb2O3/RuO2+PbO2阳极性能的影响

王雅琼 , 王鹏 , 沙红霞 , 许文林 , 陆路德

稀有金属材料与工程

采用热分解法制备了以钛为基体、SnO2+Sb2O3为中间层、RuO2+PbO2为活性层的Ti/SnO2+Sb2O3/RuO2+PbO2电极.应用极化曲线法和循环伏安法测定不同RuO2含量下电极在25℃,0.5 mol/LH2SO4溶液中的电催化活性.实验结果表明,随着RuO2含量的增加,相同电极电位下的电流密度增大;相同的扫描速率下,RuO2含量增加,电极的伏安电荷值增加,即电极的电催化活性随着RuO2含量的增加而增加.在1.0mol/LH2SO4溶液中,60℃、电流密度为2.0A/cm2条件下,电极寿命快速检测结果表明,Ti/SnO2+Sb2O3/RuO2+PbO2电极的寿命随RuO2含量的增加而下降;但与不加有SnO2+Sb2O3中间层的Ti/RuO2+PbO2电极相比,电极寿命则显著增加.RuO2的含量还对电极的表面形貌有明显的影响.

关键词: 二氧化钌 , 二氧化铅 , 电催化活性 , 寿命

Immobilization of RuO(2) on Carbon Nanotube: An X-ray Absorption Near-Edge Structure Study

Journal of Physical Chemistry C

The electronic structures of carbon nanotube/RuO(2) core/shell nanocornposite (RuO(2) thin layer coated multiwalled carbon nanotubes (MWNTs)) have been studied by X-ray absorption near-edge structures (XANES) at C K-edge, O K-edge, and Ru M(5,4)- and L(3)-edges. The variation in white-line features of the XANES at these edges supports strongly that RuO(2) interacts with MWNTs through Ru-O-C bonding, which also results in charge redistribution between C 2p-derived states in MWNT and the conduction band in RuO(2). Such chemical bonding is necessary to immobilize RuO(2) on MWNT and ensures good conductivity of MWNT/RuO(2) core/shell nanocomposite.

关键词: spectroscopy;nanoparticle;electrodes;oxidation;catalyst;nexafs;xanes

Pt/RuO2/CNTs纳米催化剂中RuO2含量对甲醇电催化氧化性能的影响

周春梅 , 王红娟 , 梁家华 , 彭峰 , 余皓 , 杨剑

催化学报

制备了一种新的甲醇直接燃料电池Pt/RuO2/CNTs阳极催化剂,在相同Pt负载量下,其甲醇电催化氧化活性是Pt/CNTs的3倍. 采用循环伏安法研究发现Pt/RuO2/CNTs纳米催化剂中RuO2含量对甲醇电催化氧化活性有明显影响,当Pt和RuO2在碳纳米管上含量分别为15%和9.5%时, Pt/RuO2/CNTs催化剂具有最佳的甲醇电催化氧化活性. RuO2负载在碳纳米管上比电容的变化,反映了水合RuO2结构中质子与电子传输平衡的能力,分析表明,催化剂中RuO2含量不同导致电容的变化是影响甲醇电催化氧化活性的主要原因. 当催化剂结构中质子与电子传输达到平衡时,催化剂比电容最大,电催化氧化活性最高. 这种基于电容关联电催化剂的观点对甲醇直接燃料电池阳极催化剂的设计非常有意义.

关键词: 铂 , 氧化钌 , 碳纳米管 , 甲醇直接燃料电池 , 阳极催化剂 , 比电容 , 质子传导

Sr2RuO4超导转变温度附近c方向磁阻行为研究

刘亚静 , 雒建林 , 陈兆甲 , 王万录

低温物理学报 doi:10.3969/j.issn.1000-3258.2004.02.004

测量了Sr2RuO4正常态和超导转变温度附近(T=1.5K,4.0K,6K)c方向的磁阻,通过对正常态磁阻分析获得了Sr2RuO4在温度4K和6K下的平均自由程.通过超导涨落分析获得了Sr2RuO4的超导特性参数ξab(0)和ξc(0).

关键词: 超导涨落 , 磁阻 , 相干

Anchoring Hydrous RuO(2) on Graphene Sheets for High-Performance Electrochemical Capacitors

Advanced Functional Materials

Hydrous ruthenium oxide (RuO(2))/graphene sheet composites (ROGSCs) with different loadings of Ru are prepared by combining sol-gel and low-temperature annealing processes. The graphene sheets (GSs) are well-separated by fine RuO(2) particles (5-20 nm) and, simultaneously, the RuO(2) particles are anchored by the richly oxygen-containing functional groups of reduced, chemically exfoliated GSs onto their surface. Benefits from the combined advantages of GSs and RuO(2) in such a unique structure are that the ROGSC-based supercapacitors exhibit high specific capacitance (similar to 570 F g(-1) for 38.3 wt% Ru loading), enhanced rate capability, excellent electrochemical stability (similar to 97.9% retention after 1000 cycles), and high energy density (20.1 Wh kg(-1)) at low operation rate (100 mA g(-1)) or high power density (10000 W kg(-1)) at a reasonable energy density (4.3 Wh kg(-1)). Interestingly, the total specific capacitance of ROGSCs is higher than the sum of specific capacitances of pure GSs and pure RuO(2) in their relative ratios, which is indicative of a positive synergistic effect of GSs and RuO(2) on the improvement of electrochemical performance. These findings demonstrate the importance and great potential of graphene-based composites in the development of high-performance energy-storage systems.

关键词: walled carbon nanotube;ruthenium oxide;energy-storage;graphite oxide;supercapacitor application;electrode materials;mesoporous carbon;nanoparticles;ultracapacitors;polyaniline

RuO2/CuO 复合电极材料的制备及其性能研究

卢云 , 元杰 , 胡永达 , 杨春

功能材料 doi:10.3969/j.issn.1001-9731.2013.19.021

分别采用溶胶-凝胶法和低热固相反应法制备无定型水合RuO2和CuO 粉末,进而制备了不同含量的RuO2/CuO 复合电极,用扫描电镜对复合电极的形貌进行表征,并对复合电极进行循环伏安、交流阻抗、恒流充放电等电化学性能测试,结果表明,RuO2/CuO 复合有助于获得较细颗粒和改善RuO2的阻抗特性。当 CuO 的含量为30%(质量分数)时,在38%的H2 SO4溶液中,扫描速度为5mV/s 时,复合电极的比电容为513F/g,内阻为0.361Ω,且在经过400次充放电后,比容量仍保持91.4%,可作为较理想的超级电容器电极材料。

关键词: RuO2 , CuO , 复合电极 , 比电容

钛基RuO2-Ta2O5涂层电极材料的电容性能分析

朱君秋 , 王欣 , 路恒达 , 邵艳群 , 张腾 , 唐电

材料热处理学报

采用热分解方法在钛基体上制备了（36％）RuO2-（64％）Ta2O5混合氧化物涂层。采用X射线衍射（XRD）、扫描电镜（SEM）、循环伏安（CV）以及恒流充放电测试研究了涂层电极的组织结构、表面形貌以及电容性能。结果表明：（36％）RuO2-（64％）Ta2O5涂层以非晶氧化物为基体，带有少量纳米微晶RuO2的组织结构。在酸性溶液中，在50～900mV／s的扫描速度下，Ti／（36％）RuO2-（64％）Ta2O5涂层电极的伏安曲线都具有近似矩形形状，表现出良好的电容特性和功率特性。以5mA／cm^2和10mA／cm^2放电，比电容分别为525．5F／g和495．1F／g。在经历2000次循环充放电后，电极的电荷储存能力仍未衰减，显示其优异的循环稳定性。

关键词: 电化学电容器 , Ti/(36％)RuO2-(64％)Ta2O5 , 循环伏安 , 热分解法

RuO2／聚吡咯复合电极的制备及性能

李祥 , 甘卫平 , 李昌 , 黄小清 , 熬斌

功能材料

通过热分解法及电化学聚合法的复合工艺制备了RuO2／聚吡咯（PPy）电极材料。使用涂覆热分解法于260℃热处理3h制备得RuO2薄膜，通过电化学聚合法把PPy粒子沉积在RuO2薄膜上。XRD表明该复合物为非晶相；红外光谱测试揭示了相对应离子结合在复合物中；SEM揭示了PPy粒子的增长规律。循环伏安及恒流充放电测试了该复合电极的电化学性能。沉积时间〈25min时，复合电极的电容量与沉积时间呈递增关系；沉积时间〉25min时，复合电极的电容量与沉积时间呈递减关系。复合电极的比电容则随沉积时间的增加而减小。沉积时间为25min时，其比电容为471F／g。RuO2／PPy电极循环稳定性较好。

关键词: RuO2 , 聚吡咯 , 涂覆热分解法 , 电化学聚合 , 比电容

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