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Evaluation of the differential capacitance for ferroelectric materials using either charge-based or energy-based expressions

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Journal of Advanced Dielectrics 2014年第3期4卷 44-53页

作者： C.M.Krowne Electromagnetic Technology Branch Electronics Science&Technology Division Naval Research Laboratory WashingtonD.C.20375USA

differential capacitance is derived based upon energy,charge or current considerations,and determined when it may go negative or *** alternative views of differential capacitances are analyzed,and the relationships between them are *** of recent interest in obtaining negative capacitance for reducing the subthreshold voltage swing in field effect type of devices,using ferroelectric materials characterized by permittivity,these concepts are now of paramount interest to the research *** completeness,differential capacitance is related to the static capacitance,and conditions when the differential capacitance may go negative in relation to the static capacitance are shown.

关键词： differential capacitance energy storage ferroelectric dielectric material negative capacitance subthreshold voltage swing reducing size of electronic devices microscopic electric polarization macroscopic permittivity

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Investigation of Electrochemical Charging Behaviors of "Naked" Gold Nanoparticles Ensembles in Aqueous Media

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Chinese Journal of Chemistry 2002年第10期20卷 1031-1037页

作者：程文龙韩晓军彭章泉董绍俊汪尔康 State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun Jilin 130022 China

Gold nanoparticles were immobilized onto the electrode surface by simple self-assembly technique. Interestingly, the ensembles of these nanoparticles exhibit quantized charging behaviors in aqueous solution. Possible ... 详细信息

关键词： naked' gold nanoparticle monolayer-protected cluster differential capacitance differential pulse voltammogram

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Enforced Freedom: Electric-Field-Induced Declustering of Ionic-Liquid Ions in the Electrical Double Layer

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Energy & Environmental Materials 2020年第3期3卷 414-420页

作者： Yufan Zhang Ting Ye Ming Chen Zachary A.H.Goodwin Guang Feng Jun Huang Alexei A.Kornyshev IEK-13 Institute of Energy and Climate ResearchForschungszentrum Jülich GmbHJülich 52425Germany State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and Technology(HUST)Wuhan 430074China Department of Chemistry Imperial College LondonMolecular Sciences Research HubWhite City CampusLondon W120BZUK Department of Physics Imperial College LondonSouth Kensington CampusLondon SW72AZUK Thomas Young Centre for Theory and Simulation of Materials Imperial College LondonSouth Kensington CampusLondon SW72AZUK Hunan Provincial Key Laboratory of Chemical Power Sources College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China

Ions in the bulk of solvent-free ionic liquids bind into ion pairs and *** competition between the propensity of ions to stay in a bound state,and the reduction of the energy when unbinding in electric field,determines the portion of free ions in the electrical double *** present the simplest possible mean-field theory to study this effect."Cracking"of ion pairs into free ions in electric field is accompanied by the change of the dielectric response of the ionic *** predictions from the theory are verified and further explored by molecular dynamics simulations.A particular finding of the theory is that the differential capacitance vs potential curve displays a bell shape,despite the low concentration of free charge carriers,because the dielectric response reduces the threshold concentration for the bell-to camelshape *** presented theory does not take into account overscreening and oscillating charge distributions in the electrical double *** in spite of the simplicity of the model,its findings demonstrate a clear physical effect:a preference to be a charged monopole rather than a dipole(or higher order multipole)in strong electric field.

关键词： differential capacitance ion pairs ionic liquids unbinding

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Development of mean-field electrical double layer theory

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Chinese Physics B 2016年第1期25卷 282-288页

作者：黄一珂刘晓红李姝言天英 School of Materials Science and Engineering National Institute for Advanced MaterialsCollaborative Innovation Center of Chemical Science and Engineering (Tianjin)Nankai University

In order to understand the electric interfacial behavior, mean field based electric double layer （EDL） theory has been continuously developed over the past 150 years. In this article, we briefly review the development of the EDL model, from the dimensionless Gouy-Chapman model to the symmetric Bikerman-Freise model, and finally toward size-asymmetric mean field theory models. We provide the general derivations within the framework of Helmholtz free energy of the lattice- gas model, and it can be seen that the above-mentioned models are consistent in the sense that the interconversi0n among them can be achieved by reducing the basic assumptions.

关键词： electric double layer mean field theory differential capacitance supercapacitor

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