检索结果-南通市图书馆

Chinese Journal of Chemistry 2016年第1期34卷 114-122页

作者： Ruijing Wang Pengfei Jia Yuying Yang Ning An Yadi Zhang Hongying Wu Zhongai Hu Key Laboratory of Eco-Environment-Relatged Polymer Materials of Ministry of Education Key Laboratory of Polymer Materials of Gansu Province College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou Gansu 730070 China

Chemical oxidation is used to cut and unzip multi-walled carbon nanotubes in the transverse direction and the axial direction to form graphene oxide nanoribbon （GONR）. ruthenium oxide/reduced graphene oxide nanoribbon composite （RuO2/rGONR） with a 72.5 wt% RuO2 loading is synthesized through an aqueous-phase reaction, in which GONR is served as starting material, followed by mild thermal treatment in ambient air. The resulting RuO2/rGONR composite achieves specific capacitance up to 677 F.g l at the current density of 1 A·g^-1 in three-electrode system using 1 mol·L^-1 H2SO4 as electrolyte. The resultant electrode exhibits an excellent rate capability （91.8% retention rate at 20 A·g^-1）. Especially, the symmetric supercapacitor assembled on the basis of RuO2/rGONR electrode delivers high energy density （16.2 Wh·kg^-1） even at the power density of 9885 W·kg^-1, which is very essential for supercapacitors.

关键词： ruthenium oxide graphene oxide nanoribbon the Hummers method symmetric supercapacitor

Pseudo-capacitance of ruthenium oxide/carbon black composites for electrochemical capacitors

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2008年第6期15卷 816-821页

作者： Xiaofeng Wang Dianbo Ruan Peng Wang Yiqiang Lu Department of Precision Instruments and Mechanics Tsinghua University Beijing 100084 China School of Applied Science University of Science and Technology BeiJing Beijing 100083 China

Hydrous ruthenium oxide was formed by a new process. The precursor was obtained by mixing the aqueous solutions of RuCl3xH2O and NaHCO3. The addition of NaHCO3 led to the formation of an oxide with extremely fine RuO2 particles forming a porous network structure in the oxide electrode. Polyethylene glycol was added as a controller to partly inhibit the sol-gel reaction. The rate capacitance of 530 F·g^-1 was measured for the powder formed at an optimal annealing temperature of 210℃. Several details concerning this new material, including crystal structure, particle size as a function of temperature, and electrochemical properties, were also reported. In addition, the rate capacitance of the composite electrode reached 800 F·g^-1 after carbon black was added. By using the modified electrode of a RuO2/carbon black composite electrode, the electrochemical capacitor exhibits high energy density and stable power characteristics. The values of specific energy and maximum specific power of 24 Wh·kg^-1 and 4 kW·kg^-1, respectively, are demonstrated for a cell voltage between 0 and 1 V.

关键词： electrochemical capacitor ruthenium oxide polyethylene glycol carbon black

Study on the Characteristics of the ruthenium oxide pH Electrode

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第A03期35卷 256-258页

作者： Jung-Chuan Chou Diing-Jia Tzeng Graduate School of Electronic Engineering National Yunlin University of Science and TechnologyDouliouTaiwan 640China

ruthenium oxide,which fabricated by radio frequency sputtering is used as the sensitive membrane,which shows that the pH sensitivity is very high and has a linear response in different buffer *** pH electrode,which applies the structure of separative structure EGFET (Extended Gate Field Effect Transistor) insteads of the conventional gate ISFET (Ion Sensitive Field Effect Transistor) for reducing the cost of the fabrication and ***,the performance of the pH sensor was falsified by the drift and *** addition,the total response is composed of the intrinsic response and drift,and the hysteresis effect combines the slow response with ***,we would also investigate the drift in the buffer solutions and hysteresis effect in the different *** this way,the more accurate sensing properties are obtained by the RuO_x pH electrode.

关键词： ruthenium oxide EGFET drift hysteresis

Hydrous ruthenium oxide with High Rate Pseudo-Capacitance Prepared by a New Sol-Gel Process

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2006年第4期19卷 341-346页

作者： Xiao-feng Wang Zheng You Dian-bo Ruan Department of Precision Instruments and Mechanics Tsinghua University Beijing 100084 China

A kind of ruthenium oxide with smaller particles and higher porosity was prepared by a sol-gel process with RuCl3·xH2O and NaHCO3 solution. Several details concerning this new material, including crystal structure, particle size as functions of the temperature, and electrochemical properties were also reported. The optimal annealing temperature was 210 ℃ and the powder annealed at this temperature had a rate capacitance of 541 F/g. In addition, the rate capacitance of the composite electrode reached 802 F/g after 10% carbon black was added, much higher than any previously reported value. High energy density supercapacitors were built with the newly discovered electrode material. Energy densities as high as 67 J/g were obtained based on the RuO2·xH2O alone. By introducing the highly porous carbon black into the electrode, energy densities great than 100 J/g could be achieved. The power density of the capacitor was enhanced significantly.

关键词： Supercapacitor ruthenium oxide Pseudo-capacitance Sol-gel growth Carbon black

Preparation and Electrochemistry of Hydrous ruthenium oxide/Active Carbon Electrode materials for Supercapacitor

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2001年第Z1期17卷 45-46页

作者： Zhang Jianrong Department of Chemistry Nanjing University

In this paper, we reported a new method to directly prepare the amorphous hydrous ruthenium oxide/active carbon powders. The relationship between the specific capacitance and ruthenium content in powders was studied in detail. Physical properties of the powders such as crystallinity、 particle size, and electrochemical characteristics of electrodes were reported along with the capacitor performance.

关键词： ruthenium oxide specific capacitance ruthenium oxide new method

Promoting effect of chloride ions on selective oxidation of methanol to methyl formate over zirconia-supported ruthenium oxide catalysts

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2013年第3期22卷 512-516页

作者： Weizhen Li Hongpeng Zhang Xiaohui He Haichao Liu Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Stable and Unstable SpeciesCollege of Chemistry and Molecular EngineeringPeking University

The effect of chloride ions on a monoclinic ZrO2-supported RuOx （RuOx/m-ZrO2） catalyst with a Ru surface density of 0.3 Ru/nm2 was studied in the selective oxidation of methanol to methyl formate （MF） at a low temperature of 373 K. The m-ZrO2 support was Cl-free, and Cl- ions were introduced into the RuOx/m-ZrO2 catalyst by impregnation with zirconium oxychloride or ammonium chloride and subsequent thermal treatment in air at 673 K. The structures of these catalysts were characterized by X-ray diffraction, Raman and X-ray photoelectron spectroscopies. Their reducibility was probed by temperature-programmed reduction in H2. The RuOx domains were present as highly dispersed Rut42- structure on m-ZrO2 with similar reducibility for the RuOx/m-ZrO2 samples irrespective of modification with or without Cl ions. Introduction of appropriate amounts of zirconium oxychloride into RuOx/m-ZrO2 led to a remarkable increase in the methanol oxidation rate and MF selectivity, whereas introduction of ammonium chloride or zirconyl nitrate significantly inhibited the catalytic performance of RuOx/m-ZrO2. The promoting effect of Cl- ions derived from zirconium oxychloride can be tentatively attributed to their roles in facilitating the adsorption of methanol and desorption of MF product or its intermediates. This finding provides novel insights into the promoting effect of Cl- ions on oxides-based catalysts for selective oxidation reactions.

关键词： methanol oxidation ruthenium oxide monoclinic zirconia chloride promoting effect methyl formate

Development and Electrochemical Studies of ruthenium Based Mixed oxide Catalyst Electrodes for Chlorine Evolution

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2002年第2期18卷 133-138页

作者： L.X.Yang J.P.G.Farr Department of Chemical and Processing Engineering University of Newcastle Merz CourtNewcastle upon Tyne NE17RU School of Metallurgy and Materials The University of Birmingham EdgbastonBirmingham B152TTUK

Experimental results are presented which allow comparison of the electrochemical performance of RuO 2/Ti, Ru 0 3 Sn 0 7 O 2/Ti and Ru 0 3 V 0 7 O 2/Ti catalysts prepared on a titanium substrate by thermal decomposition from respective precursors. The highest activity for chlorine evolution is observed on the Ru 0 3 V 0 7 O 2/Ti electrode, lower on Ru 0 3 Sn 0 7 O 2/Ti and least on RuO 2/Ti. Voltammograms obtained in the polarisable region are used to characterize the different electrodes. Further more an analysis of the catalytic activity and reaction kinetics of the developed electrodes in NaCl are presented.

关键词： Catalyst Cl_(2) evolution ruthenium oxide

Selective conversion of N_(2) to NH_(3) on highly dispersed RuO_(2) using amphiphilic ionic liquid-anchored fibrous carbon structure

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第4期31卷 474-482页

作者： Kahyun Ham Muhammad Salman Sunki Chung Minjun Choi HyungKuk Ju Hye Jin Lee Jaeyoung Lee School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology(GIST)123 Cheomdangwagi-RoGwangju 61005South Korea International Future Research Center of Chemical Energy Storage and Conversion Processes GIST123 Cheomdangwagi-RoGwangju 61005South Korea Ertl Center for Electrochemical and Catalysis GIST123 Cheomdangwagi-RoGwangju 61005South Korea Department of Chemistry and Green-Nano Materials Research Center Kyungpook National University80 Daehak-RoDaegu-city 41566South Korea Hydrogen Research Department Korea Institute of Energy Research152 Gajeong-RoYuseong-guDaejeon 34129South Korea

Ammonia (NH_(3)) plays a key role in the agricultural fertilizer and commodity chemical industries and is useful for exploring hydrogen storage *** electrochemical nitrogen reduction reaction (NRR) is receiving attention as an environmentally sustainable NH_(3) synthesis replacement for the traditional Haber–Bosch process owing to its near ambient reaction conditions (oxide[HOBIM]OH) for a highly dispersed ruthenium oxide electrocatalyst to achieve a biased *** observed uniform distribution of RuO_(2) on the carbon fiber and increase in the surface area for N_(2) adsorption by limiting proton access can be attributed to the presence of imidazolium ***,extensive N_(2) adsorption contributes to enhanced NRR selectivity with an NH_(3) yield of 3.0×10^(-10)mol cm^(-2)s^(-1)(91.8μg h^(-1)mg^(-1)) and a faradaic efficiency of 2.2%at-0.20 V_(RHE).We expect our observations to provide new insights into the design of effective electrode structures for electrochemical NH;synthesis.

关键词： Ammonia synthesis Nitrogen reduction reaction Imidazolium-based ionic liquid ruthenium oxide

A Hybrid Metal oxide Supercapacitor in Aqueous KOH Electrolyte

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2006年第9期24卷 1126-1132页

作者：王晓峰尤政阮殿波 Department of Precision Instruments and Mechanics Tsinghua University Beijing 100084 China

A novel type of composite electrode based on sheet like cobalt oxide particles has been used in supercapacitors. Cobalt oxide cathodically deposited from Co（NO3）2 solution with carbon nanotubes as matrix exhibited large pseudo-capacitance of 322 F·g^-1 in 6 mol·L^-1 KOH. A sol-gel process for the preparation of ultrafine RuO2 particles was developed to design electrodes with large surface area. The composite electrodes were developed by the deposition of RuO： on the surface of carbon nanotubes. A specific capacitance of 785 F·g^-1 can be achieved with the 20% carbon nanotubes loaded. To characterize the metal oxide nanocomposite electrode, a cyclic voltammetry and AC impedance test are executed. This study also reports a hybrid capacitor, which consists of cobalt oxide composite as a cathode and ruthenium oxide composite as an anode. The electrochemical performance of the hybrid capacitor is characterized by a dc charge/discharge test and cyclic voltammograms. The hybrid capacitor shows capacitor behavior with an extended operating voltage of 1.4 V. The maximum energy density and specific power density of the cell reach the value of 23.7 and 8.1 kW·g^-1 respectively. The hybrid capacitor exhibits high-energy density and stable power characteristics.

关键词： cobalt oxide ruthenium oxide carbon nanotube nanocomposite hybrid supercapacitor

Constructing a hollow core-shell structure of RuO_(2) wrapped by hierarchical porous carbon shell with Ru NPs loading for supercapacitor

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2023年第3期55卷 93-100页

作者： Lianlian Zhao Fufu Di Xiaonan Wang Sumbal Farid Suzhen Ren State Key Laboratory of Fine Chemicals College of Chemical EngineeringDalian University of TechnologyDalian 116024China

Hollow core-shell structure nanomaterials have been broadly used in energy storage, catalysis, reactor,and other fields due to their unique characteristics, including the synergy between different materials,a large specific surface area, small density, large charge carrying capacity and so on. However, their synthesis processes were mostly complicated, and few researches reported one-step encapsulation of different valence states of precious metals in carbon-based materials. Hence, a novel hollow core-shell nanostructure electrode material, RuO_(2)@Ru/HCs, with a lower mass of ruthenium to reduce costs was constructed by one-step hydrothermal method with hard template and co-assembled strategy, consisting of RuO_(2) core and ruthenium nanoparticles(Ru NPs) in carbon shell. The Ru NPs were uniformly assembled in the carbon layer, which not only improved the electronic conductivity but also provided more active centers to enhance the pseudocapacitance. The RuO_(2) core further enhanced the material’s energy storage capacity. Excellent capacitance storage(318.5 F·g^(-1)at 0.5 A·g^(-1)), rate performance(64.4%) from 0.5 A·g^(-1)to 20 A·g^(-1), and cycling stability(92.3% retention after 5000 cycles) were obtained by adjusting Ru loading to 0.92%(mass). It could be attributed to the wider pore size distribution in the micropores which increased the transfer of electrons and protons. The symmetrical supercapacitor device based on RuO_(2)@Ru/HCs could successfully light up the LED lamp. Therefore, our work verified that interfacial modification of RuO_(2) and carbon could bring attractive insights into energy density for nextgeneration supercapacitors.

关键词： ruthenium nanoparticles ruthenium oxide Hollow carbon sphere shell Hierarchical pore structure Silica template Hydrothermal method