检索结果-南通市图书馆

Journal of Thermal Science 2024年第2期33卷 501-508页

作者： LI Weiwei MIAO Qi zhang yelong DING Hongliang YANG Sa LAI Yuan FENG Daili DING Yulong JIN Yi TAN Linghua School of Chemistry and Chemical Engineering Nanjing University of Science&TechnologyNanjing210094China National Special Superfine Powder Engineering Research Center Nanjing University of Science and TechnologyNanjing210094China Nanjing Jinhe Energy Material Co. LtdNanjing210047China School of Chemical Engineering University of BirminghamBirminghamB152TTUK School of Energy&Environmental Engineering University of Science and Technology BeijingBeijing100083China

In this paper,a novel ternary eutectic salt Na_(2)CO_(3)-Li_(2)CO_(3)-LiF was designed and investigated for concentrated solar power(CSP).The FactSage software was used to predict the composition and eutectic point of Na_(2)CO_(3)-Li_(2)CO_(3)-*** microstructure,thermophysical properties,and thermal stability of eutectic salts were experimentally measured using various analytical *** a mass ratio of 57%:32%:11%,the eutectic salt exhibited excellent thermal storage properties with a fusion enthalpy of 413 J/g and a melting point of 426.8℃.The excellent thermal stability of the eutectic salt was reflected by a weight loss of only 0.8% at 600℃.

关键词： phase change materials ternary eutectic salt latent heat thermal stability

P-Bi2Te3/MXene超结构钾离子电池负极制备及其性能

在线全文

学校读者我要写书评

暂无评论

物理化学学报 2024年第2期40卷 84-90页

作者：杨帆刘争汪达许冠南张业龙彭章泉五邑大学应用物理与材料学院澳门大学应用物理及材料工程研究院中国科学院大连化学物理研究所谱学电化学与锂离子电池实验室

Bi2Te3钾离子电池负极存在结构不稳定性和电化学反应动力学缓慢问题。本研究在手风琴状MXene基底上生长棒状Bi2Te3,随后利用P掺杂制备了高性能P-Bi2Te3/MXene超结构。这种新型负极具有丰富的Te空位和良好的自适应特性,展现出优异的循环... 详细信息

Bi2Te3钾离子电池负极存在结构不稳定性和电化学反应动力学缓慢问题。本研究在手风琴状MXene基底上生长棒状Bi2Te3,随后利用P掺杂制备了高性能P-Bi2Te3/MXene超结构。这种新型负极具有丰富的Te空位和良好的自适应特性,展现出优异的循环稳定性(在0.2 A·g-1电流密度下200次循环后可逆容量为323.1 mAh·g-1)和出色的倍率能力(20 A·g-1时可逆容量为67.1 mAh·g-1)。动力学分析和非原位表征表明,该超结构具有优异的赝电容特性、出色的K+离子扩散能力以及可逆的嵌入反应和转化反应机理。

关键词：钾离子电池负极 Bi2Te3 MXene P掺杂

Dealloyed Silver Nanoparticles as Efficient Catalyst Towards Oxygen Reduction in Alkaline Solution

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2016年第1期32卷 106-111页

作者： CUI Qinghua zhang yelong PENG zhangquan State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changehun 130022 P. R. China University of Chinese Academy of Sciences Beijing 100049 P. R. China

Silver nanoparticles（Ag NPs） were prepared by dealloying Mg-Ag alloy precursor. The obtained Ag NPs have an average ligament size of （50±10） nm. Electrocatalytic activity of Ag NPs towards oxygen reduction reaction（ORR） in 0.1 mol/L NaOH solution was assessed via cyclic voltammetry（CV）, rotating ring disk electrode（RRDE） techniques, and electrochemical impedance spectroscopy（EIS）. The electrochemical active area for the ORR was evaluated by means of the charge of the underpotential deposition（UPD） of lead（Pb） on Ag NPs. The CV results in- dicate that Ag NPs have a higher current density and more positive onset potential than the bulk Ag electrode. RRDE was employed to determine kinetic parameters for O2 reduction. Ag NPs exhibit a higher kinetic current density of 25.84 mA/cm2 and a rate constant of 5.45× 10^-2 cm/s at -0.35 V vs. Hg/HgO. The number of electrons（n） involved in ORR is close to 4. Further, EIS data show significantly low charge transfer resistances on the Ag NPs electrode. The results indicate that the prepared Ag NPs have a high activity and are promising catalyst for ORR in alkaline solution.

关键词： Silver nanoparticles Electrochemical activity Oxygen reduction reaction

Li_2O_2 oxidation: the charging reaction in the aprotic Li-O_2 batteries

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

Science Bulletin 2015年第14期60卷 1227-1234页

作者： Qinghua Cui yelong zhang Shunchao Ma zhangquan Peng State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences

Aprotic Li-O2 battery has attracted a great deal of interest because of its high theoretical energy density that is far beyond what the best Li-ion technologies can ***, the present Li-O2 batteries suffer from the low energy efficiency that is limited mainly by the high overpotentials required to re-oxidize Li2O2, the discharge product. Over the past few years, considerable research efforts have been devoted to the understanding of the Li2O2 oxidation reactions. Here, we summarize the results obtained from the fundamental study of the Li2O2 oxidation, including its morphology, reaction route, kinetics, the initial location upon oxidation and the charge transport within Li2O2. A better mechanistic understanding of the Li2O2 oxidation reaction will provide a solid foundation for the realization of practical Li-O2 cells with a higher energy efficiency.

关键词： Aprotic Li-O2 battery Li202 oxidationMorphology Kinetics Initial location uponoxidation Charge transport

3D star-like atypical hybrid MOF derived single-atom catalyst boosts oxygen reduction catalysis

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第4期30卷 355-360页

作者： Lei Zhou Peng Zhou yelong zhang Bingyao Liu Peng Gao Shaojun Guo BIC-ESAT College of EngineeringPeking UniversityBeijing 100871China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China School of Applied Physics and Materials Wuyi UniversityJiangmen 529020GuangdongChina International Center for Quantum Materials and Electron Microscopy LaboratorySchool of PhysicsPeking UniversityBeijing 100871China

Developing high-efficiency,stable and non-precious electrocatalysts for oxygen reduction reaction(ORR)is highly important for energy conversion and *** atom catalysts(SACs)show good potential in enhancing ORR,however,the specifical control over the coordination surroundings around single metal center to intrinsically modify the electron structure is still a great ***,we demonstrate that a 3 D hybrid MOF composed of cobalt doped ZIF-L and ZIF-8,featuring star morphology with six equal branches,can be used as an advanced precursor for making the Co SACs for greatly boosted *** as-synthesized Co_(SA)-N-C exhibits excellent ORR activity with E_(1/2) of 0.891 V in alkaline medium,outperforming the commercial Pt/C by 39 m ***,the E_(1/2) of Co_(SA)-N-C(0.790 V)is merely 15 m V,less than that of Pt/C(0.805 V)in acid medium,which is among the best in the reported state-of-the-art *** calculations demonstrate that the enhanced ORR performance is assigned to the formation of atomically isolated cobalt atom coordinated three N atoms and one C atom,which is easier to decrease the free energy of rate determining step and accelerate the ORR process than that of traditional cobalt atom coordinated four N *** addition,a primary Zn-air battery with Co_(SA)-N-C cathode reveals a maximum power density of 92.2 m W cm^(-2) at 120.0 m A cm^(-2),far higher than that of commercial catalysts(74.2 m W cm^(-2) at 110.0 m A cm^(-2)).

关键词： Single atom catalysts Oxygen reduction reaction Metal-organic frameworks Zn-air battery

Comparative Study of Two Carbon Fiber Cathodes and Theoretical Analysis in Microbial Fuel Cells on Ocean Floor

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2014年第2期13卷 257-261页

作者： FU Yubin LIU Yuanyuan XU Qian LU Zhikai zhang yelong Institute of Materials Science and Engineering Ocean University of China

Cathode activity plays an important role in the improvement of the microbial fuel cells on ocean floor （BMFCs）. A comparison study between Rayon-based （CF-R） and PAN-based carbon fiber （CF-P） cathodes is conducted in the paper. The two carbon fibers were heat treated to improve cell performance （CF-R-H ＆ CF-P-H）, and were used to build a new BMFCs structure with a foamy carbon anode. The maximum power density was 112.4mWm-2 for CF-R-H, followed by 66.6mWm-2 for CF-R, 49.7 mWm-2 for CF-P-H and 21.6mWm-2 for CF-P respectively. The higher specific area and deep groove make CF-R have a better power output than with CF-P. Meanwhile, heat treatment of carbon fiber can improve cell power, nearly two-fold higher than heat treatment of plain fiber. This improvement may be due to the quinones group formation to accelerate the reduction of oxygen and electron transfer on the fiber surface in the three phase boundary after heat treatment. Compared to PAN-based carbon fiber, Rayon-based carbon fiber would be preferentially selected as cathode in novel BMFCs design due to its high surface area, low cost and higher power. The comparison research is significant for cathode material selection and cell design.

关键词： microbial fuel cells on ocean floor carbon fiber cathode heat treatment power density theoretical analysis

Metal-organic framework-derived Fe/Cu-substituted Co nanoparticles embedded in CNTs-grafted carbon polyhedron for Zn-air batteries

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2020年第2期2卷 283-293页

作者： Kexin zhang yelong zhang Qinghua zhang Zibin Liang Lin Gu Wenhan Guo Bingjun Zhu Shaojun Guo Ruqiang Zou Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Department of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijingChina Department of Applied Physics and Materials Wuyi UniversityJiangmenGuangdong ProvinceChina Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijingChina Institute of Clean Energy Peking UniversityBeijingChina

Metal-organic frameworks(MOFs)and MOF-derived materials have attracted great attention as alternatives to noble-metal based electrocatalysts owing to their intriguing structure properties,especially for high efficiency and stable oxygen reduction reaction(ORR).Herein,we employed a one-pot reaction to make a multimetal(Fe,Co,Cu,and Zn)mixed zeolitic imidazolate framework(MM-ZIF)via adopting a simple in situ redox *** pyrolysis of the target MM-ZIF,a highly porous carbon polyhedron(FC-C@NC)grafted with abundant carbon nanotubes was obtained,in which ultrasmall Co nanoparticles with partial lattice sites substituted by Fe and Cu were *** obtained FC-C@NC possessed large surface area,highly porous structure,widely-spread metal active sites,and conductive carbon frameworks,contributing to outstanding ORR activity and long-term *** displayed superior tolerance to methanol crossover and exceeded the commercial Pt/C catalyst and most previously reported non-noble-metal ***,the as-produced FC-C@NC-based zinc-air battery afforded an open-circuit potential of 1.466 V,a large specific capacity of 659.5 mAh/g,and a high gravimetric energy density of 784.3 Wh/kgZn,significantly outperforming the Pt/C-based cathode.

关键词： electrocatalysis lattice sites substitution metal-organic frameworks oxygen reduction reaction zinc-air battery

AN ANALYSIS OF SOME FACTORS OF THE TRAINING OF CHINESE SAILORS

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

中国远洋航务 2001年第11期 24-26页

作者： zhang yelong

Ministry of Communications of P. R. China has successfully organized some dozens of classes to train ship officers, and given corresponding tests, which played a very important part in improving the whole educational level of sailors in our country. However, with the development of situation and the application field of science and technology being continuously enlarged, some parts of present training have become too obsolete to satisfy practical need. At the same time, a lot of adverse information fed back from the organizations such as International Maritime Organization(IMO), harbor supervision office, classification society and shipping company. It is necessary to adjust and reinforce the training of sailors in our nation. The following

关键词：远洋公告

Ni@RuM(M=Ni or Co) core@shell nanocrystals with high mass activity for overall water-splitting catalysis

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2019年第12期62卷 1868-1876页

作者： Shan zhang Fan Lv Xiaoyan zhang yelong zhang Haishuang Zhu Huanhuan Xing Zijie Mu Jing Li Shaojun Guo Erkang Wang State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230029China Department of Materials Science&Engineering College of EngineeringPeking UniversityBeijing 100871China

Developing efficient water-splitting electrocatalysts with high mass activity is in urgent need for largescale sustainable production of hydrogen but,still remains as a big ***,we report a one-pot method to fabricate a series of core@shell Ni@RuM(M=Ni or Co)nanocrystals(NCs)with Ni as the core and tunable RuM(M=Ni or Co)as the alloy shell for efficient water-splitting *** these core@shell NCs,the obtained Ni@Ru Ni NCs exhibit the highest intrinsic activity for hydrogen evolution reaction(HER)and possess an outstanding mass activity of 1590 m A mgRu^-1 at 0.07 V *** hydrogen electrode(RHE),which is 1.7 times higher than that of commercial Pt/C(950 m A mgPt^-1).As for oxygen evolution reaction(OER),the prepared Ni@Ru0.4 Co0.6 NCs with optimized shell composition achieve more enhanced mass activity of 270 m A mgRu^-1 at1.56 V ***,approaching three times higher than that of commercial RuO2(89 m A mgRu^-1).The superb mass activity of these Ni@Ru M(M=Ni or Co)NCs can be attributed to their core@shell structure and modulated electronic structure through alloying with Ni or Co metal in the shell.

关键词： electrocatalysis ruthenium core-shell oxygen evolutionreaction hydrogen evolution reaction

Nitrogen-doped mesoporous carbon nanospheres loaded with cobalt nanoparticles for oxygen reduction and Zn–air batteries

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第7期34卷 318-322页

作者： Lulu Chen yelong zhang Jianbo Jia School of Biotechnology and Health Sciences Wuyi UniversityJiangmen 529020China School of Applied Physics and Materials Wuyi UniversityJiangmen 529020China

Mesoporous carbon supported with transition metals nanoparticles performs desired activities for oxygen reduction reaction(ORR) and clean energy conversion devices such as Zn–air batteries. In this work,we synthesized N-doped mesoporous carbon loaded with cobalt nanoparticles(CoMCN) through selfassembly method. There are sufficient mesopores on the carbon substrate which stem from the poreforming agent. These mesopores can provide enough accessible active sites and profitable charge/mass transport for ORR. The high content of pyridinic and graphitic N is beneficial for promoting O_(2) adsorption and reduction. The smaller value of ID/IGindicates the higher degree of graphitization of CoMCN,providing better electronic conductivity. The half-wave potential of CoMCN is 0.865 V in basic solution,which is 24 mV more positive than that of the commercial Pt/C(0.841 V). In addition, CoMCN performs excellent methanol tolerance and stability under both basic and acidic conditions. The Zn–air battery assembled with CoMCN performs the larger power density and open-circuit voltage than the commercial Pt/C-based battery, indicating the potential application in energy conversion systems. This work provides thoughtful ideas for fabricating transition metal nanoparticles based porous carbon for electrocatalysis and metal–air batteries.

关键词： Nitrogen-doped carbon Mesoporous carbon Metallic cobalt nanoparticles Oxygen reduction reaction Zn–air batteries