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Journal of Energy Chemistry 2015年第4期24卷 388-393页

作者： Fen Ran Yunlong Yang Lei Zhao Xiaoqin Niu Dingjun Zhang Lingbin Kong Yongchun Luo Long Kang State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Department of Chemistry and Biochemistry University of California

In this study,nano-polyanline and manganese oxide nanometer tubular composites（nano-PANI@MnO2）were prepared by a surface initiated polymerization method and used as electrochemical capacitor electrode materials; and the effect of aniline amount on the microstructure and electrochemical performance was investigated. The microstructures and surface morphologies of nano-PANI@MnO2 were characterized by X-ray diffraction,scanning electron microscopy and fourier transformation infrared spectroscope. The electrochemical performance of these composite materials was performed with cyclic voltammetry,charge–discharge test and electrochemical impedance spectroscopy,respectively. The results demonstrate that the feed ratio of aniline to MnO2 played a very important role in constructing the hierarchically nano-structure,which would,hence,determine the electrochemical performance of the materials. Using the templateassisted strategy and controlling the feed ratio of aniline to MnO2,the nanometer tubular structure of nanoPANI@MnO2 was obtained. A maximum specific capacitance of 386 F/g was achieved in aqueous 1 mol/L Na NO3 electrolyte with the potential range from 0 to 0.6 V（vs. SCE）.

关键词： Electrochemical capacitors Nano-PANI@MnO2 electrode materials

A Three-Dimensional Silicon-Diacetylene Porous Organic Radical Polymer

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CCS Chemistry 2023年第3期5卷 607-615页

作者： Chengcheng Dong Juan Chu Linzhu Cao Fengchao Cui Shuang Liang Xintong Zhang Xin Tao Heng-guo Wang Guangshan Zhu Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education School of ChemistryNortheast Normal UniversityChangchun 130024Jilin Key Laboratory of UV-Emitting materials and Technology of Ministry of Education School of PhysicsNortheast Normal UniversityChangchun 130024Jilin

Radical-containing porous organic polymers(POPs)have drawn great interest in various ***,the synthesis of radical POPs remains challenging due to the unstable nature of organic ***,a persistent and stable three-dimensional silicon-diacetylene porous organic radical polymer was synthesized via a classic Eglinton homocoupling reaction of *** presence of carbon radicals in this material was confirmed by electron paramagnetic resonance,and its paramagnetic behavior was analyzed by a superconducting quantum interference *** unique material has a low-lying lowest unoccupied molecular orbital(LUMO)energy level(−5.47 eV)and a small energy gap(ca.1.46 eV),which shows long-term cycling stability and excellent rate capability as an anode material for lithium-ion batteries,demonstrating potential application in energy fields.

关键词： three-dimensional porous organic polymers radical polymer conjugated diacetylene electrode materials

Rational design of three-dimensional branched NiCo-P@CoNiMo-P core/shell nanowire heterostructures for high-performance hybrid supercapacitor

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Journal of Energy Chemistry 2021年第10期30卷 489-496,I0013页

作者： Yijing Huang Chong Luo Qiaobao Zhang Hehe Zhang Ming-Sheng Wang State Key Lab of Physical Chemistry of Solid Surfaces College of MaterialsXiamen UniversityXiamen 361005FujianChina

Owing to the dramatically enhanced charge-mass transport and abundant electrochemically active sites,transition metal compound electrodes are increasingly attractive for achieving high-performance supercapacitors(SCs).Here,we report the fabrication of nickel foam supported three-dimensional(3 D)branched nickel-cobalt phosphides@tri-metal cobalt-nickel-molybdenum phosphides core/shell nanowire heterostructures(denoted as NiCo-P@CoNiMo-P)as high-performance electrode materials for hybrid *** presence of multiple valences of the cations in such NiCo-P@CoNiMo-P enables rich redox reactions and promoted synergy *** from their collective effects,the resulting electrode demonstrates high specific capacity of 1366 C g^(-1) at 2 A g^(-1)(2.03 C cm^(-2) at2 mA cm^(-2))and 922 C g^(-1) at 10 A g^(-1),as well as good cycling stability(retaining~94%of the initial capacity after 6000 cycles at 15 A g^(-1)).A hybrid SC using the NiCo-P@CoNiMo-P as the positive electrode and N-doped rGOs as the negative electrode exhibits a high energy density of 81.4 Wh kg^(-1) at a power density of 1213 W kg^(-1) and a capacity retention of 132%even after 6000 cycles at 10 A g^(-1).Our findings can facilitate the material design for boosting the performance of transition metal compounds based materials for fast energy storage.

关键词： Transition metal phosphides Branched nanowire heterostructures electrode materials Hybird supercapacitors

MOF‑Derived CoSe2@N‑Doped Carbon Matrix Confined in Hollow Mesoporous Carbon Nanospheres as High‑Performance Anodes for Potassium‑Ion Batteries

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Nano-Micro Letters 2021年第1期13卷 123-137页

作者： Su Hyun Yang Seung‑Keun Park Yun Chan Kang Department of materials Science and Engineering Korea UniversityAnam‑DongSeongbuk‑GuSeoul 136‑713Republic of Korea Department of Chemical Engineering Kongju National University1223‑24 Cheonan‑daeroSeobuk‑guCheonan 31080Republic of Korea

In this work,a novel vacuum-assisted strategy is proposed to homogenously form Metal-organic frameworks within hollow mesoporous carbon nanospheres(HMCSs)via a solid-state *** method is applied to synthesize an ultrafine CoSe2 nanocrystal@N-doped carbon matrix confined within HMCSs(denoted as CoSe2@NC/HMCS)for use as advanced anodes in highperformance potassium-ion batteries(KIBs).The approach involves a solvent-free thermal treatment to form a Co-based zeolitic imidazolate framework(ZIF-67)within the HMCS templates under vacuum conditions and the subsequent *** treatment under vacuum facilitates the infiltration of the cobalt precursor and organic linker into the HMCS and simultaneously transforms them into stable ZIF-67 particles without any *** the subsequent selenization process,the“dual confinement system”,composed of both the N-doped carbon matrix derived from the organic linker and the small-sized pores of HMCS,can effectively suppress the overgrowth of CoSe2 ***,the resulting uniquely structured composite exhibits a stable cycling performance(442 mAh g^−1 at 0.1 A g^−1 after 120 cycles)and excellent rate capability(263 mAh g^−1 at 2.0 A g^−1)as the anode material for KIBs.

关键词： Metal-organic frameworks Hollow mesoporous carbon nanospheres Potassium-ion batteries Cobalt selenides electrode materials

Preparation and characterization of LiAl_xMn_(2-x)O_4 for a supercapacitor in aqueous electrolyte

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International Journal of Minerals,Metallurgy and materials 2009年第1期16卷 112-118页

作者： Yun Xue Ye Chen Mi-lin Zhang Yong-de Yan College of materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

LiAlxMn2-xO4 （0≤x≤0.5） was synthesized by high temperature solid-state reaction. The structure and morphology of LiAlxMn2-xO4 were investigated by X-ray diffraction and scanning electron microscopy （SEM）. The results indicate that all samples show spinel phase. The polyhedral particles turn to club-shaped, then change to small spherical, and finally become agglomerates with increasing Al content. The supercapacitive performances of LiAlxMn2-xO4 were studied by means of galvanostatic charge-discharge, cyclic voltammetry, and alternating current （AC） impedance in 2 mol·L^-1 （NH4）2SO4 aqueous solution. The results show that LiAlxMn2-xO4 represents rectangular shape performance in the potential range of 0-1 V. The capacity and cycle performance can be improved by doping Al. The composition of x=0.1 has the maximum special capacitance of 160 F·g^-1, which is 1.37 times that of LiMn2O4 electrode. The capacitance loss of LiAlxMn2-xO4 with x=0.1 is only about 14% after 100 cycles.

关键词： supercapacitor electrode materials aqueous electrolyte spinel

An Electrochemically Stable 2D Covalent Organic Framework for High-performance Organic Supercapacitors

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Chinese Journal of Polymer Science 2020年第5期38卷 558-564,I0008页

作者： Rashid Iqbal Amir Badshah Ying-Jie Ma Lin-Jie Zhi CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Department of chemistry Kohat University of Science and TechnologyKhyber PakhtunkhwaPakistan

An electrochemically stable two-dimensional covalent organic framework,PI-COF,has been synthesized by a scalable solvothermal ***-COF possesses a highly crystalline structure,well-defined pores,high specific surface area,and cluster *** to these features,PI-COF can work as electrode materials in organic supercapacitors,exhibiting a specific capacitance of 163 F/g at 0.5 A/g over a wide potential window of 0-2.5 ***,PI-COF shows excellent rate performance,which can deliver 96 F/g even at a high current density of 40 A/*** of the high capacitance and wide potential window,PI-COF has achieved a superior energy density of 35.7 W h/kg at a power density of 250 W/*** importantly,due to the remarkable electrochemical stability,the PI-COF based device shows outstanding cycling stability with 84.1%capacitance maintained(137 F/g)after 3.0×10^4 charged/discharged cycles at 1 A/*** work should shed light on designing new COF-based electrode materials for and other electrochemical devices.

关键词： 2D COFs Electrochemically stable electrode materials High energy density Organic supercapacitors

Effect of stoichiometry and Cu-substitution on the phase structure and hydrogen storage properties of Ml-Mg-Ni-based alloys

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International Journal of Minerals,Metallurgy and materials 2015年第1期22卷 86-93页

作者： Yuan Li Yang Tao Quan Huo Hebei Key Laboratory of Applied Chemistry School of Environmental and Chemical EngineeringYanshan University

To improve the electrochemical properties of rare-earth-Mg-Ni-based hydrogen storage alloys, the effects of stoichiometry and Cu-substitution on the phase structure and thermodynamic properties of the alloys were studied. Nonsubstituted Ml0.80Mg0.20（Ni2.90Co0.50-Mn0.30Al0.30）x （x=0.68, 0.70, 0.72, 0.74, 0.76） alloys and Cu-substituted Ml0.80Mg0.20（Ni2.90Co0.50-yCuyMn0.30Al0.30）0.70 （y=0, 0.10, 0.30, 0.50） alloys were prepared by induction melting. Phase structure analysis shows that the nonsubstituted alloys consist of a LaNi5 phase, a LaNi3 phase, and a minor La2Ni7 phase;in addition, in the case of Cu-substitution, the Nd2Ni7 phase appears and the LaNi3 phase vanishes. Ther-modynamic tests show that the enthalpy change in the dehydriding process decreases, indicating that hydride stability decreases with in-creasing stoichiometry and increasing Cu content. The maximum discharge capacity, kinetic properties, and cycling stability of the alloy electrodes all increase and then decrease with increasing stoichiometry or increasing Cu content. Furthermore, Cu substitution for Co ame-liorates the discharge capacity, kinetics, and cycling stability of the alloy electrodes.

关键词： hydrogen storage alloys electrode materials stoichiometry substitution phase structure thermodynamic properties electro-chemical properties

Application of Nanocrystalline LaNi_5-type Hydrogen Absorbing Alloys in Ni-MH_x Batteries

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Journal of Rare Earths 2004年第5期22卷 596-599页

作者： Jurczyk M Nowak M Institute of materials Science and Engineering Poznan University of Technology 60-965 Poznan PolandInstitute of Materials Science and Engineering Poznan University of Technology 60-965 Poznan Poland

The structure and electrochemical properties of nanocrystalline LaNi_5-type alloys were studied. These materials were prepared by mechanical alloying (MA) followed by annealing. The properties of hydrogen host materials can be modified substantially by alloying to obtain the desired storage characteristics. It was found that the partial substitution of Ni by Al or Mn in LaNi_(5-x)M_x alloy leads to an increase in discharge capacity. The alloying elements such as Al, Mn and Co greatly improved the cycle life of LaNi_5 material. For example, in the nanocrystalline LaNi_(3.75)Mn_(0.75)Al_(0.25)Co_(0.25) powder, discharge capacity up to 258 mAh·g^(-1) was measured (at 40 mA·g^(-1) discharge current). Furthermore, the effect of the graphite coating on the structure of some nanocrystalline alloys and the electrodes characteristics were investigated. The mechanical coating with graphite effectively reduced the degradation rate of the studied electrode materials. The combination of a nanocrystalline LaNi_5-type hydride electrodes and a nickel positive electrode to form a Ni-MH battery, was successful.

关键词： hydrogen absorbing materials electrode materials nanocrystalline materials Ni-MH_x batteries rare earths

Lignocellulosic biomass as sustainable feedstock and materials for power generation and energy storage

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Journal of Energy Chemistry 2021年第6期30卷 247-280,I0007页

作者： Fangqian Wang Denghao Ouyang Ziyuan Zhou Samuel JPage Dehua Liu Xuebing Zhao Key Laboratory of Industrial Biocatalysis Ministry of EducationTsinghua UniversityBeijing 100084China Institute of Applied Chemistry Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Molecular Sciences Research Hub Imperial College LondonWhite City CampusLondon W120BZUK

Lignocellulosic biomass has attracted great interest in recent years for energy production due to its renewability and carbon-neutral *** are various ways to convert lignocellulose to gaseous,liquid and solid fuels via thermochemical,chemical or biological *** biomass derived fuels include syngas,bio-gas,bio-oil,bioethanol and biochar,all of which could be used as fuels for furnace,engine,turbine or fuel *** biomass fuel cells mediated by various electron carriers provide a new direction of lignocellulose *** metal and non-metal based carriers have been screened for mediating the electron transfer from biomass to oxygen thus generating *** power density of direct biomass fuel cells can be over 100 mW cm^(-2),which shows promise for practical *** and its isolated components,primarily cellulose and lignin,have also been paid considerable attention as sustainable carbonaceous materials for preparation of electrodes for supercapacitors,lithium-ion batteries and lithium-sulfur *** this paper,we have provided a state-of-the-art review on the research progress of lignocellulosic biomass as feedstock and materials for power generation and energy storage focusing on the chemistry aspects of the *** was recommended that process integration should be performed to reduce the cost for thermochemical and biological conversion of lignocellulose to biofuels,while efforts should be made to increase efficiency and improve the properties for biomass fuelled fuel cells and biomass derived electrodes for energy storage.

关键词： Lignocellulosic biomass Cellulose Lignin Power generation Energy storage electrode materials

A hierarchical porous carbon membrane from polyacrylonitrile/polyvinylpyrrolidone blending membranes: Preparation,characterization and electrochemical capacitive performance

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Journal of Energy Chemistry 2014年第6期23卷 684-693页

作者： Huili Fan Fen Ran Xuanxuan Zhang Haiming Song Wenxia Jing Kuiwen Shen Lingbin Kong Long Kang School of materials Science and Engineering Lanzhou University of Technology State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology

Novel hierarchical porous carbon membranes were fabricated through a simple carbonization procedure of well-defined blending polymer membrane precursors containing the source of carbon polyacrylonitrile （PAN） and an additive of polyvinylpyrrolidone （PVP）, which was prepared using phase inversion method. The as-fabricated materials were further used as the active electrode materials for supercapacitors. The effects of PVP concentration in the casting solution on structure feature and electrochemical capacitive performance of the as-prepared carbon membranes were also studied in detail. As the electrode material for supercapacitor, a high specific capacitance of 278.0 F/g could be attained at a current of 5 mA/cm2 and about 92.90% capacity retention could be maintained after 2000 charge/discharge cycles in 2 mol/L KOH solution with a PVP concentration of 0.3 wt% in the casting solution. The facile hierarchical pore structure preparation method and the good electrochemical capacitive performance make the prepared carbon membrane particularly promising for use in supercapacitor.

关键词： porous carbon supercapacitors phase separation electrode materials additive