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Nano-Micro Letters 2018年第4期10卷 81-91页

作者： Yage Wu Yunlong Yang Xiaoning Zhao yongtao tan Ying Liu Zhen Wang Fen Ran State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology School of Material Science and Engineering Lanzhou University of Technology

Transition-metal nitrides exhibit wide potential windows and good electrochemical performance, but usually experience imbalanced practical applications in the energy storage field due to aggregation, poor circulation stability, and complicated syntheses. In this study, a novel and simple multiphase polymeric strategy was developed to fabricate hybrid vanadium nitride/carbon(VN/C) membranes for supercapacitor negative electrodes, in which VN nanoparticles were uniformly distributed in the hierarchical porous carbon 3D networks. The supercapacitor negative electrode based on VN/C membranes exhibited a high specific capacitance of 392.0 F g^(-1) at 0.5 A g^(-1) and an excellent rate capability with capacitance retention of 50.5% at 30 A g^(-1). For the asymmetric device fabricated using Ni(OH)_2//VN/C membranes, a high energy density of 43.0 Wh kg^(-1) at a power density of800 W kg^(-1) was observed. Moreover, the device also showed good cycling stability of 82.9% at a current density of 1.0 A g^(-1) after 8000 cycles. This work may throw a light on simply the fabrication of other high-performance transition-metal nitridebased supercapacitor or other energy storage devices.

关键词： Supercapacitors Vanadium nitride/carbon 3D network Hierarchical porous structure

A bird nest-like manganese dioxide and its application as electrode in supercapacitors

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Journal of Energy Chemistry 2013年第6期22卷 928-934页

作者： Fen Ran Huili Fan Lingren Wang Lei Zhao yongtao tan Xuanxuan Zhang Lingbin Kong Long Kang State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials Lanzhou University of Technology Key Laboratory of Non-ferrous Metal Alloys and Processing of Ministry of Education Lanzhou University of Technology

A novel bird nest-like nanostructured MnO2(BNNS-MnO2) was prepared by a facile and cost-effective strategy. Their structures and morphologies were characterized by field emission scanning electron microscopy, transmission electron microscopy and powder X-ray diffraction. Capacitive behaviors were investigated by cyclic voltammetry and galvanostatic charge-discharge. The obtained nano-MnO2 possesses a well designed loose-assembled hierarchical nanoarchitecture with an appropriate crystallinity which gives rise to excellent performances as an electrode material for supercapacitors. A maximum specific capacitance of 917 F/g has been obtained at a current density of 5 mA/cm2 in 6 mol/L KOH aqueous solution, and a specific capacitance of 210 F/g has been maintained for 500 cycles. As the low cost of MnSO4 and KCr2O7 and the low reaction temperature, the present method avoids the requirements for complicated operations, time/energy-consuming and expensive reagents, and perhaps is ready for the industrialization of nano-MnO2 production.

关键词： energy storage nanostructured MnO2 supercapacitors electrochemical performance electrode material

Novel Hybrid Nanoparticles of Vanadium Nitride/Porous Carbon as an Anode Material for Symmetrical Supercapacitor

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Nano-Micro Letters 2017年第1期9卷 89-103页

作者： Yunlong Yang Kuiwen Shen Ying Liu yongtao tan Xiaoning Zhao Jiayu Wu Xiaoqin Niu Fen Ran State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Chemistry and Biochemistry University of California Santa Cruz

Hybrid materials of vanadium nitride and porous carbon nanoparticles(VN/PCNPs) were fabricated by a facile pyrolysis process of vanadium pentoxide(V_2O_5) xerogel and melamine at relatively low temperature of 800 °C for supercapacitor application. The effects of the feed ratio of V_2O_5 to melamine(r), and nitrogen flow rate on the microstructure and electrochemical performance were also investigated. It was found that the size of the as-synthesized nanoparticles is about 20 nm. Both r value and N_2 flow rate have enormous impacts on morphology and microstructure of the nanoparticle, which correspondingly determined the electrochemical performance of the material. The VN/C hybrid nanoparticles exhibited high capacitive properties, and a maximum specific capacitance of 255.0 Fg^(-1) was achieved at a current density of 1.0 Ag^(-1) in 2 M KOH aqueous electrolyte and the potential range from 0 to -1.15 V. In addition,symmetrical supercapacitor fabricated with the as-synthesized VN/PCNPs presents a high specific capacitance of 43.5 F g^(-1) at 0.5 A g^(-1) based on the entire cell, and an energy density of 8.0 Wh kg^(-1) when the power density was 575 W kg^(-1). Even when the power density increased to 2831.5 W kg^(-1), the energy density still remained 6.1 Wh kg^(-1).

关键词： Supercapacitors Nanoparticle Vanadium nitride Porous carbon Hybrid materials

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向可持续城市化的最佳实践学习

城市规划学刊 2018年第5期 125-126页

作者： OCHOA J J tan yongtao

城市化是世界文明史上最重要的社会变革。事实证明城市化对经济增长和国家财當至关重要,并能带来就业、教育、创新、福利、社会结构等方面的巨大益处。而另一方面,快速城市化增长也正让人类付出环境退化、气候变化、贫困和不平等等代价... 详细信息

城市化是世界文明史上最重要的社会变革。事实证明城市化对经济增长和国家财當至关重要,并能带来就业、教育、创新、福利、社会结构等方面的巨大益处。而另一方面,快速城市化增长也正让人类付出环境退化、气候变化、贫困和不平等等代价。人们普遍认为必须在城市化实践中采用可持续发展原则,否则继续增长的城市化将进一步损害城市的可持续性。世界各地都在实施可持续城市化,并创造了一批具有示范意义的最佳实践案例,这些

关键词：可持续城市化行动领域最佳实践城市可持续发展

Microporous carbon nanofibers prepared by combining electrospinning and phase separation methods for supercapacitor

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Journal of Energy Chemistry 2016年第4期25卷 587-593页

作者： Chang Liu yongtao tan Ying Liu Kuiwen Shen Bowu Peng Xiaoqin Niu Fen Ran School of Material Science and Engineering Lanzhou University of Technology State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology

Microporous carbon nanofibers (MCNFs) derived from polyacrylonitrile nanofibers were fabricated via electrospinning technology and phase separation in the presence of polyvinylpyrrolidone (PVP). PVP together with a mixed solvent of N, N-Dimethylformamide and dimethyl sulfoxide was used as pore forming agent. The influences of PVP content in casting solution on the structure and electrochemical performance of the MCNFs were also investigated. The highest capacitance of 200 F/g was obtained on a three-electrode system at a scan rate of 0.5 A/g. The good performance was owing to the high specific surface area and the large amount of micro-pores, which enhanced the absorption and the transportation efficiency of electrolyte ion during charge/discharge process. This research indicated that the combination of electrospinning and phase separation technology could be used to fabricate microporous carbon nanofibers as electrode materials for supercapacitors with high specific surface area and outstanding electrochemical performance. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： Supercapacitor Electrospinning Nanofiber Phase separation

A dandelion-like carbon microsphere/MnO_2 nanosheets composite for supercapacitors

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Journal of Energy Chemistry 2014年第1期23卷 82-90页

作者： Xuanxuan Zhang Fen Ran Huili Fan yongtao tan Lei Zhao Xiaoming Li Lingbin Kong Long Kang State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials Lanzhou University of Technology Key Laboratory of Non-ferrous Metal Alloys and Processing of Ministry of Education Lanzhou University of Technology

This article reported the electrochemical performance of a novel cabon microsphere/MnO2nanosheets(CMS/MnO2) composite prepared by a in situ self-limiting deposition method under hydrothermal condition. The results of scanning electron microscopy(SEM) and transmission electron microscopy(TEM) revealed that MnO2nanosheets homogeneously grew onto the surface of CMS to form a loose-packed and dandelion-like core/shell microstructure. The unique microstructure plays a basic role in electrochemical accessibility of electrolyte to MnO2active material and a fast diffusion rate within the redox phase. The results of cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectrometry indicated that the prepared CMS/MnO2composite presented high capacitance of 181 F g-1and long cycle life of 61% capacity retention after 2000 charge/discharge cycles in 1 mol/L Na2SO4solution, which show strong promise for high-rate electrochemical capacitive energy storage applications.

关键词： manganese oxide nanosheet carbon microsphere(CMS) composite electrode supercapacitor

Nano-Au@PANI蛋黄空心结构电极材料的构筑及超级电容性能

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材料导报 2018年第1期32卷 47-50,57页

作者：谭永涛孔令斌康龙冉奋兰州理工大学材料科学与工程学院兰州730050 兰州理工大学省部共建有色金属先进加工与可再生利用国家重点实验室兰州730050

采用两步化学氧化法,通过控制氧化剂的扩散合成了Nano-Au@PANI复合材料。采用透射电镜对其形貌进行了表征,采用电化学工作站对其电化学性能进行了测试,并研究了反应时间对其电化学性能的影响。结果表明,合成的Nano-Au@PANI复合材料具有... 详细信息

采用两步化学氧化法,通过控制氧化剂的扩散合成了Nano-Au@PANI复合材料。采用透射电镜对其形貌进行了表征,采用电化学工作站对其电化学性能进行了测试,并研究了反应时间对其电化学性能的影响。结果表明,合成的Nano-Au@PANI复合材料具有蛋黄空心结构,PANI外壳层的厚度随时间的延长而增加,其作为电极材料比容量出现了先增大后减小的趋势。当反应时间为12h时,其PANI外壳层的厚度约为21nm,比容量为79F·g^(-1)。

关键词：复合电极材料金纳米颗粒聚苯胺超级电容器

A CdZnTe Nuclear Radiation Detector

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近代物理研究所和兰州重离子加速器实验室年报：英文版 2006年第1期 132-133页

作者： Wang Zhusheng Xiao Guoqing Li Zhankui Zhao yongtao tan Jilian Bao Zhiqin Zhang Ling Li Peilin

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小户型住宅的开发

住宅科技 2001年第11期21卷 15-17页

作者：谭永涛东南大学土木工程学院南京210096

随着房地产开发热的不断升温 ,小户型住宅越来越受到消费者的关注 ,作为房地产市场细化的一部分 ,其存在有广阔的消费市场。创新是开发小户型住宅的核心。

关键词：小户型住宅消费市场房地产业室内装修

用静电纺丝技术制备纳米片取向结构复合电介质材料

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宁夏工程技术 2024年第1期23卷 23-27,34页

作者：王健王宝慧谭永涛宁夏大学材料与新能源学院宁夏银川750021

金属化薄膜电容器因其具有超高功率密度而在新能源行业领域受到广泛关注。为了提升薄膜电容器的储能密度,将高绝缘氮化硼纳米片(BNNS)引入到聚偏氟乙烯(PVDF)基聚合物中以制备电容器用高储能复合电介质材料,并利用静电纺丝技术实现BNNS... 详细信息

金属化薄膜电容器因其具有超高功率密度而在新能源行业领域受到广泛关注。为了提升薄膜电容器的储能密度,将高绝缘氮化硼纳米片(BNNS)引入到聚偏氟乙烯(PVDF)基聚合物中以制备电容器用高储能复合电介质材料,并利用静电纺丝技术实现BNNS均匀取向的分布。结果表明,均匀取向分布的高绝缘纳米片可以抑制载流子迁移并提升复合材料的击穿场强。结合相场模拟分析可知,均匀取向分布的BNNS结构能调控外电场分布且更有效地阻滞复合材料被击穿,最终在396 MV/m的电场强度下实现高达10.5 J/cm^(3)的储能密度。

关键词：复合电介质静电纺丝 BNNS 击穿场强

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