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Charge Storage Properties of Aqueous Halide Supercapatteries with Activated Carbon and Graphene Nanoplatelets as Active Electrode Materials

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Energy & Environmental Materials 2021年第3期4卷 481-491页

作者： Bamidele Akinwolemiwa Chaohui Wei Qinghua Yang George z.chen International Doctoral Innovation Centre Faculty of Science and EngineeringThe University of Nottingham Ningbo ChinaNingbo 315100China Department of Chemical and Environmental Engineering Faculty of Science and EngineeringThe University of Nottingham Ningbo ChinaNingbo 315100China Department of Chemical and Environmental Engineering and Advanced Materials Research GroupFaculty of EngineeringThe University of NottinghamNottingham NG72RDUK

Device level performance of aqueous halide supercapatteries fabricated with equal electrode mass of activated carbon or graphene nanoplatelets has been *** was revealed that the surface oxygen groups in the graphitic structures of the nanoplatelets contributed toward a more enhanced charge storage capacity in bromide containing redox ***,the rate performance of the devices could be linked to the effect of the pore size of the carbons on the dynamics of the inactive alkali metal counterion of the redox halide ***,the charge storage performance of aqueous halide supercapatteries with graphene nanoplatelets as the electrode material may be attributed to the combined effect of the porous structure on the dynamics of the non-active cations and a possible interaction of the Br^(-)/(Br_(2)+Br^(-)_(3))redox triple with the surface oxygen groups within the graphitic layer of the ***,it has been shown that the surface groups and microstructure of electrode materials must be critically correlated with the redox electrolytes in the ongoing efforts to commercialize these devices.

关键词： carbon materials device engineering energy efficiency redox electrolyte supercapattery

Environmental and energy gains from using molten magnesium–sodium–potassium chlorides for electro-metallisation of refractory metal oxides

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Progress in Natural Science:Materials International 2015年第6期25卷 650-653页

作者： Wei Li Yating Yuan Xianbo Jin Hualin chen George z.chen College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan University Department of Rare Metals State Key Laboratory for Separation and Comprehensive Utilization of Rare MetalsGuangdong Key Laboratory for Development and Application of Rare EarthsGuangzhou Research Institute of Non-ferrous Metals Department of Chemical and Environmental Engineering Faculty of EngineeringUniversity of Nottingham

The molten eutectic mixture of magnesium,sodium and potassium chlorides(Mg Cl2–Na Cl–KCl) has inappreciable solubility for oxide ions,and can help disengage a carbon anode from the oxide ions generated at a metal oxide cathode,and effectively avoid carbon dioxide *** "disengaging strategy" was successfully demonstrated in electro-reduction of solid oxides of zirconium and *** has led to significantly higher current efficiency(93%),and lower energy consumption(1.4 k W h kg 1) in electrolysis of tantalum oxide to tantalum metal compared to the conventional electrolysis in molten calcium chloride(e.g.78% and 2.4 k W h/kg-Ta).

关键词： Electrometallisation Molten salt Tantalum Electro-reduction Magnesium chloride

Electrochemical study of different membrane materials for the fabrication of stable,reproducible and reusable reference electrode

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Journal of Energy Chemistry 2020年第10期29卷 33-41页

作者： Nawar K.Al-Shara Farooq Sher Sania z.Iqbal zaman Sajid George z.chen Department of Chemical and Environmental Engineering University of NottinghamUniversity ParkNottingham NG72RDUnited Kingdom School of Mechanical Aerospace and Automotive EngineeringFaculty of EngineeringEnvironmental and ComputingCoventry UniversityCoventry CV12JHUnited Kingdom Department of Biochemistry University of AgricultureFaisalabad 38000Pakistan Department of Process Engineering Memorial University of NewfoundlandSt John’s Newfoundland A1B 3×5Canada

Fabrication of stable,reproducible and reusable reference electrodes for low energy and high-temperature steam splitting is of great interest for hydrogen fuel production without anthropogenic carbon dioxide(CO2)*** study has been conducted for the detection of suitable material for the fabrication of novel reference *** the present scenario,this research is designed to fabricate a novel nickel reference electrode by using operating conditions of eutectic molten hydroxide(NaOH-KOH,49-51 mol%)at temperature 300℃in an ion-conducting membrane of alumina and mullite ***,the designed nickel reference electrode has been examined for its reusability and stability by using electrochemical technique and cyclic *** scans of cyclic voltammetry are performed for both membrane fabricated reference electrode.A slight positive shift in oxidation peaks is observed for mullite membrane electrode(64 mV from scan 1 to 5).The stability measurements are noted by changing the scan rate between 50 and 150 mV s−***,the results show that the Ni/Ni(OH)2 reference electrode covered with a mullite membrane is stable and reusable at 300℃temperature without any *** stability and reusability of prepared nickel reference electrode covered by mullite tube in the eutectic molten hydroxide were up to 9 days to carry out an electrochemical investigation,while for alumina tube reference electrode the stability and reliability were up to 3 *** internal electrolytic material and ionic conductance can play an important role for future studies with this reference electrode along with optimisation of temperature and scan rate parameters.

关键词： Renewable energy Hydrogen production Electrode process Cyclic voltammetry Reference electrode and Molten salts

XPS and micro-mechanical characterisation of nitrogen ion implanted low alloy steel

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Science China Mathematics 2001年第S1期44卷 354-361页

作者： A.O.Olofinjana z.chen J.M.Bell Department of Materials and Process Engineering University of Waikato Private Bag 3105 Hamilton New Zealand School of Mechanical Manufacturing & Medical Engineering Queensland University of TechnologyBrisbaneAustralia

The surface composition of low alloy steel after N_2^+ implantation was studied with X-ray photo-electron spectroscopy (XPS). The effect of the implantation on the mechanical hardness was evaluated by ultra-micro hardness indentation. Chemical characterisation of the surface indi- cated that a thin layer rich in N, C and Si was formed. It is shown that Fe played little role in the chemical composition and the structure of the modified surface. The mechanical hardness of N_2^+ implanted surface was 35-50 GPa compared with a value of 10 GPa for the untreated sample. It is thought that the high hardness observed on the surface and in the sub-surface was as a result of chemical modification to form a film of Si doped carbon nitride. There is strong evidence from the XPS and the nanoindentation studies that the bonding structure of the C-N in the near surface is essentially sp^3 types expected in crystalline C_3N_4. The value of nitrogen ion implantation as process for improving the wear resistance of low alloy steels is emphasized.

关键词： surface modification ion implantation low alloy steels Si doped carbon nitride

Fabrication and Mechano-sensing Characteristics of Bending Polypyrrole Actuator

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 240-245页

作者： chen Jinyou HU Wei School of Automotive Engineering Hunan Financial&Industrial Vocational-technical CollegeHengyang 421002China College of Mechanical and Electrical Engineering Hunan Agricultural UniversityChangsha 410128China

To prepare a conductive polymer actuator with decent performance,a self-built experimental platform for the preparation of polypyrrole film is *** of the essential goals is to examine the mechanical characteristics of the actuator in the presence of various combinations of process parameters,combined with the orthogonal test method of"four factors and three levels".The bending and sensing characteristics of actuators of various sizes are methodically examined using a self-made bending polypyrrole *** functional relationship between the bending displacement and the output voltage signal is established by studying the characteristics of the actuator sensor subjected to various degrees of *** experimental results reveal that the bending displacement of the actuator tip almost exhibits a linear variation as a function of length and *** the voltage reaches 0.8 V,the bending speed of the actuator tends to be ***,the mechanical properties of the self-assembled polypyrrole actuator are verified by the design and fabrication of the microgripper.

关键词： conductive polymer polypyrrole mechanical characteristics actuators sensing characteristics

Construction of Non-Equilibrium Gas Distribution Functions through Expansions in Peculiar Velocity Space

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Advances in Applied Mathematics and Mechanics 2023年第6期15卷 1456-1472页

作者： z.Y.Yuan z.chen C.Shu Y.Y.Liu z.L.zhang School of Energy and Power Engineering Nanjing University of Science and TechnologyNanjingJiangsu 210094China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Mechanical Engineering National University of Singapore10 Kent Ridge Crescent119260Singapore

Gas distribution function plays a crucial role in the description of gas flows at the mesoscopic *** the presence of non-equilibrium flow,the distribution function loses its rotational symmetricity,making the mathematical derivation *** both the Chapman-Enskog expansion and the Hermite polynomial expansion(Grad’s method),we observe that the non-equilibrium effect is closely related to the peculiar velocity space(C).Based on this recognition,we propose a new methodology to construct the non-equilibrium distribution function from the perspective of polynomial expansion in the peculiar velocity space of *** coefficients involved in the non-equilibrium distribution function can be exactly determined by the compatibility conditions and the moment *** new framework allows constructing non-equilibrium distribution functions at any order of truncation,and the ones at the third and the fourth order have been presented in this paper for illustration *** validations demonstrate that the new method is more accurate than the Grad’s method at the same truncation error for describing non-equilibrium ***-dimensional benchmark tests are performed to shed light on the applicability of the new method to practical engineering problems.

关键词： Non-equilibrium gas distribution function peculiar velocity space complete poly-nomial expansion

Construction of 3D porous Cu_(1.81)S/nitrogen-doped carbon frameworks for ultrafast and long-cycle life sodium-ion storage

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 191-200页

作者： chen chen Hongyu Xue Qilin Hu Mengfan Wang Pan Shang ziyan Liu Tao Peng Deyang zhang Yongsong Luo Key Laboratory of Microelectronics and Energy of Henan Province Henan Joint International Research Laboratory of New Energy Storage TechnologyCollege of Physics and Electronic EngineeringXinyang Normal UniversityXinyang 464000China School of Physics and Electronic Engineering Nanyang Normal UniversityNanyang 473061China

Transition metal sulfides have great potential as anode mterials for sodium-ion batteries(SIBs)due to their high theoretical specific ***,the inferior intrinsic conductivity and large volume variation during sodiation-desodiation processes seriously affect its high-rate and long-cyde performance,unbeneficial for the application as fast-charging and long-cycling SIBs ***,the three-dimensional porous Cu_(1.81)S/nitrogen-doped carbon frameworks(Cu_(1.81)S/NC)are synthesized by the simple and facile sol-gel and annealing processes,which can accommodate the volumetric expansion of Cu_(1.81)S nanoparticles and accelerate the transmission of ions and electrons during Na^(+)insertion/extraction processes,exhibiting the excellent rate capability(250.6 mA·g^(-1)at 20.0 A·g^(-1))and outstanding cycling stability(70% capacity retention for 6000 cycles at 10.0 A·g^(-1))for ***,the Na-ion full cells coupled with Na_(3)V_(2)(PO_(4))_(3)/C cathode also demonstrate the satisfactory reversible specific capacity of 330.5 mAh·g^(-1)at 5.0 A·g^(-1)and long-cycle performance with the 86.9% capacity retention at 2.0 A·g^(-1)after 750 *** work proposes a promising way for the conversionbased metal sulfides for the applications as fast-charging sodium-ion battery anode.

关键词： copper sulfide nanoparticles porous carbon framework fast charging long-cycle performance sodium-ion full batteries

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配电系统中的风力发电(英文)

电工技术学报 2013年第5期28卷 1-14页

作者：陈哲奥尔堡大学奥尔堡DK.9220丹麦中国科学院大学(国科大)中丹学院北京100049

近年来,随着风力发电的迅速增长,大量风力发电机组/风电场已安装、投运并接入电力系统。相对大型集中式风电场接入输电网,众多分布式风力发电机组/风电场作为分布式发电单元安装在配电系统中。本文主要讨论了风电机组接入配电系统的相... 详细信息

近年来,随着风力发电的迅速增长,大量风力发电机组/风电场已安装、投运并接入电力系统。相对大型集中式风电场接入输电网,众多分布式风力发电机组/风电场作为分布式发电单元安装在配电系统中。本文主要讨论了风电机组接入配电系统的相关问题。首先简要介绍了风力发电系统,其次描述了分布式风力发电系统的基本特征和技术特点,并研究了风电机组/风电场接入配电系统的主要的技术要求,提出并分析了可能的出现的问题和解决方案。

关键词：风力发电机并网配电网电能质量故障穿越稳定性分布式发电并网导则

Mechanical properties of Al/a-C nanocomposite thin films synthesized using a plasma focus device

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Chinese Physics B 2014年第2期23卷 353-358页

作者： z.A.Umar R.S.Rawat R.Ahmad A.K.Kumar Y.Wang T.Hussain z.chen L.Shen z.zhang NSSE National Institute of EducationNanyang Technological University Department of Physics GC University Center for Advanced Studies in Physics (CASP) GC University School of Materials Science and Engineering Nanyang Technological University Institute of Materials Research and Engineering ASTAR (Agency for ScienceTechnology and Research)3 Research Link

The Al/a-C nanocomposite thin films are synthesized on Si substrates using a dense plasma focus device with alu- minum fitted anode and operating with CH4/Ar admixture. X-ray diffractometer results confirm the formation of metallic crystalline Al phases using different numbers of focus shots. Raman analyses show the formation of D and G peaks for all thin film samples, confirming the presence of a-C in the nanocomposite thin films. The formation of Al/a-C nanocomposite thin films is further confirmed using X-ray photoelectron spectroscopy analysis. The scanning electron microscope results show that the deposited thin films consist of nanoparticles and their agglomerates. The sizes of th agglomerates increase with increasing numbers of focus deposition shots. The nanoindentation results show the variations in hardness and elastic modulus values of nanocomposite thin film with increasing the number of focus shots. Maximum values of hardness and elastic modulus of the composite thin film prepared using 20 focus shots are found to be about 10.7 GPa and 189.2 GPa, respectively.

关键词： dense plasma focus X-ray photoelectron spectroscopy field emission scanning electron micro- scope elastic modulus