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排序方式: 共有272条查询结果,搜索用时 31 毫秒
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《International Journal of Hydrogen Energy》2020,45(16):9603-9611
The development of high-performance electrocatalysts for methanol oxidation is an urgent task to enhance the efficiency of direct methanol fuel cells. We report a simple and controllable method to fabricate Pt-decorated TiN electrocatalysts using self-terminated electrodeposition at room temperature and ambient pressure. Under optimized deposition parameters such as electrolyte pH, TiN substrate pretreatment, and pulsed deposition potential, quenching of the Pt electrodeposition facilitates obtaining an extremely low Pt mass loading (0.93 μg/cm2) on the TiN substrate. Repeated deposition potential pulses enable a gradual increase in Pt loading, with a precise control of the loaded Pt mass. Maximum intrinsic and mass activities for the methanol oxidation reaction are achieved for the catalyst with a Pt loading mass of 55.0 μg/cm2, prepared by 20 deposition pulses. The maximum intrinsic activity achieved with the Pt-decorated TiN electrocatalyst is five times higher than that obtained with bulk Pt. The present results thus provide a facile method for the fabrication of cost-effective electrocatalysts. 相似文献
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为研究高盐高有机制药废水污泥的电渗透脱水效果,深入认识化学污泥的电脱水过程,本文采用电渗透高干脱水技术对经抽滤脱水的高盐高有机制药废水化学污泥进行深度脱水,考察了泥饼初始pH的改变对污泥电渗透高干脱水过程中阴阳极污泥的含水率、电流、电导率、pH、zeta电位与能耗的影响,验证了对高盐高有机制药废水污泥实行电渗透高干脱水的可行性,解析了化学污泥电渗透脱水过程的机制。结果表明,泥饼pH为2、3、4时,zeta电位为正值,电渗流反向流动,无法脱水;pH增至5时,zeta电位为负值,电渗流从阴极脱除,污泥含水率从53.2%降至44.8%,脱水效果最好;但pH增至6时,脱水量有所降低。污泥电导率随pH的增加而降低。pH为5时初始电流最大。脱水15min时,即污泥含水率降至45.5%时,能源利用率最高。 相似文献
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Wang Ziping Fang Yushuang Zhou Xianfeng Li Zhibo Zhu Haiguang Du Fanglin Yuan Xun Yao Qiaofeng Xie Jianping 《Nano Research》2020,13(1):203-208
Nano Research - Ultrasmall silver nanoclusters (Ag NCs) with rich surface chemistry and good biocompatibility are promising in antibacterial application, however, further development of Ag NCs for... 相似文献
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《Computational Materials Science》2011,50(2):363-372
In the study of crystalline materials, the lattice constant (LC) of perovskites compounds play important role in the identification of materials. It reveals various interesting properties. In this study, we have employed Support Vector Regression, Artificial Neural Network, and Generalized Regression Neural Network based Computational Intelligent (CI) techniques to predict LC of cubic and monoclinic perovskites. Due to their interesting physiochemical properties, investigations in modeling the structural properties of perovskites have gained considerable attention. A dataset of a reasonable number of cubic and monoclinic perovskites are collected from the current literature. The CI techniques can efficiently correlate the LC of the perovskites materials with the ionic radii of constituent elements. A performance analysis of CI techniques is carried out with Multiple Linear Regression techniques, SPuDS software, and Density-Functional Theory. We have observed that the CI techniques yield accurate LC prediction as against the conventional approaches.Availability: Matlab based computer program developed for this work is available on request. 相似文献
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崔明芳 《冶金标准化与质量》2011,49(4):22-24
本方法基玗pH值~4的微酸性溶液中,用氟化氢铵掩蔽Fe^3+,二价铜与碘化钾反应生成碘化亚铜沉淀并析出碘,以淀粉为指示剂,用硫代硫酸钠标准溶液滴定所析出的碘,既可测定出铜的含量,并对分析方法的理论进行了探讨 相似文献
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胡鹏 《精细与专用化学品》2011,19(7):4-7
研究了不同牌号环保塑解剂在天然胶和带束层配方中的应用,结果表明,塑解剂A86、Renacit 11/WG能等量替代塑解剂SJ-103;在带束层配方中适量增加防老剂RD的用量,能够保持原有的黏合力水平及老化性能。 相似文献
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郑新卿 《机电产品开发与创新》2011,24(3):163-165
三相变频电路的矩阵计算是破解变频电路的难题之一,也为高等数学矩阵运算应用于电力电子拖动系统的重要体现,本文从矩阵运算的基本方法出发,借助于三相电路电压与电流的基本性质,运用矩阵方式进行了运算推论,在理清矩阵运算的同时,给出基本的表现形式,以引导研究者和学习者,进一步认识矩阵变频电路的特性. 相似文献
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