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Ag-integrated mixed metallic Co-Fe-Ni-Mn hydroxide composite as advanced electrode for high-performance hybrid supercapacitors

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Journal of Energy Chemistry 2024年第1期88卷 579-591,I0013页

作者： anki reddy mule Bhimanaboina Ramulu Shaik Junied Arbaz Anand Kurakula Jae Su Yu Department of Electronics and Information Convergence Engineering Institute for Wearable Convergence ElectronicsKyung Hee UniversityYongin-siGyeonggi-do 17104Republic of Korea

Direct growth of redox-active noble metals and rational design of multifunctional electrochemical active materials play crucial roles in developing novel electrode materials for energy storage *** this regard,silver(Ag)has attracted great attention in the design of efficient *** by the house/building process,which means electing the right land,it lays a strong foundation and building essential columns for a complex ***,we report the construction of multifaceted heterostructure cobalt-iron hydroxide(CFOH)nanowires(NWs)@nickel cobalt manganese hydroxides and/or hydrate(NCMOH)nanosheets(NSs)on the Ag-deposited nickel foam and carbon cloth(i.e.,Ag/NF and Ag/CC)***,the formation and charge storage mechanism of Ag are described,and these contribute to good conductive and redox chemistry *** switching architectural integrity of metal and redox materials on metallic frames may significantly boost charge storage and rate performance with noticeable drop in *** as-fabricated Ag@CFOH@NCMOH/NF electrode delivered superior areal capacity value of 2081.9μA h cm^(-2)at 5 mA cm^(-2).Moreover,as-assembled hybrid cell based on NF(HC/NF)device exhibited remarkable areal capacity value of 1.82 mA h cm^(-2)at 5 mA cm^(-2)with excellent rate capability of 74.77%even at 70 mA cm^(-2)Furthermore,HC/NF device achieved maximum energy and power densities of 1.39 mW h cm^(-2)and 42.35 mW cm^(-2),*** verify practical applicability,both devices were also tested to serve as a self-charging station for various portable electronic devices.

关键词： Current collectors Redox-active silver Transition metal-hydroxides Electrochemical performance Hybrid supercapacitor

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Multicomponent mixed metallic hierarchical ZnNi@Ni@PEDOT arrayed structures as advanced electrode for high-performance hybrid electrochemical cells

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能源化学:英文版 2023年第9期84卷 448-458页

作者： anki reddy mule Bhimanaboina Ramulu Shaik Junied Arbaz Jae Su Yu Department of Electronics and Information Convergence Engineering Institute for Wearable Convergence ElectronicsKyung Hee University1732 Deogyeong-daeroGiheung-guYongin-siGyeonggi-do 17104Republic of Korea

Engineering multicomponent nanomaterials as an electrode with rationalized ordered structures is a promising strategy for fulfilling the high-energy storage needs of supercapacitors(SCs).Even now,the fundamental barrier to utilizing hydroxides/hydroxyl carbonates is their poor electrochemical performance,resulting from the significantly poor electrical conductivity and sluggish charge storage ***,a multilayered structural approach is primarily and successfully used to construct electrodes as one of the efficient *** method has made it possible to develop well-ordered nanostructured electrodes with good performance by taking advantage of tunable approach ***,we report the design of multilayered heterostructure porous zinc-nickel nanosheets@nickel flakes hydroxyl carbonates and/or hydroxides integrated with conductive PEDOT fibrous network(i.e.,ZnNi@Ni@PEDOT) via facile synthesis *** combined hybrid electrode acquires the features of high electrical conductivity from one part and various valance states from another one to develop a well-organized nanosheet/flake/fibrous-like heterostructure with decent mechanical strength,creating robust synergistic ***,the designed binder-free ZnNi@Ni@PEDOT electrode delivers a high areal capacity value of 1050.1 μA h cm^(-2) at 3 mA cm^(-2) with good cycling durability,significantly outperforming other individual ***,its feasibility is also tested by constructing a hybrid electrochemical cell(HEC).The assembled HEC exhibits a high areal capacity value of 783.8 μA h cm^(-2) at5 mA cm^(-2).and even at a high current density of 100 mA cm^(-2)(484.6 μA h cm^(-2)),the device still retains a rate capability of 61,82%,Also,the HEC shows maximum energy and power densities of0.595 mW h cm^(-2) and 77.23 mW cm^(-2),respectively,along with good cycling *** obtained energy storage capabilities effectively power various electronic *** results provide a v

关键词： Mixed metal Hydroxyl carbonates/hydroxides Layer-by-layer design Fibrous PEDOT network Electrochemical performance Hybrid electrochemical cell

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Thermal radiation effect on unsteady threedimensional MHD flow of micropolar fluid over a horizontal surface of a parabola of revolution

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Propulsion and Power Research 2022年第1期11卷 129-142页

作者： S.R.R.reddy P.Bala anki reddy Center for Nonlinear Systems Chennai Institute of TechnologyChennai600069T.N.India Department of Mathematics S.A.S.Vellore Institute of TechnologyVellore632014T.N.India

This paper explores the time-dependent magnetohydrodynamics(MHD)micropolar fluid flow over a three-dimensional variable stretching surface in the occurrence of radiation *** model time-dependent partial differential equations(PDE’s)in three independent variables are transformed into ordinary differential equations(ODE’s)by the suitable selfsimilarity *** perturbation method(HPM)and Runge-Kutta(RK)4^(th) order method along with shooting technique are used in the present *** also,HPM results are compared with Runge-Kutta(RK)4^(th) order method along with the shooting *** velocity,micro rotation in x and y directions,temperature,skin friction factor and heat transfer rates are examined for the emerging *** velocity profiles and momentum boundary layer thickness intensification with increasing values of the vortex viscosity *** higher value of a magnetic parameter declines the skin friction *** type of investigation may be profitable to the polymer fluids,exotic lubricants,electronic chips,artificial fibers,drawing of copper wires,etc.

关键词： Radiation parameter Magnetohydrodynamics Micropolar fluid Variable thickness sheet Homotopy perturbation method(HPM)

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The assessment of time dependent flow of Williamson fluid with radiative blood flow against a wedge

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Propulsion and Power Research 2020年第1期9卷 87-99页

作者： K.Subbarayudu S.Suneetha P.Bala anki reddy Department of Applied Mathematics Yogi Vemana UniversityKadapa516005India Department of Mathematics S.A.S.Vellore Institute of TechnologyVellore632014India

The present pagination reports both Brownian diffusion and thermophoresis aspects subject to magneto hydrodynamic Williamson fluid *** the flow is unsteady and blood is treated as Williamson fluid over a wedge with *** governing equations are transformed into ordinary differential equations by using similarity *** analytical solutions of the transformed governing equations are obtained by using the RK 4th order method along with shooting technique *** effects of various physical parameters such as Hartmann number,local Weissenberg number,radiation parameter,unsteadiness parameter,Prandtl number,Lewis number,Brownian diffusion,thermophoresis,wedge angle parameter,moving wedge parameter,on velocity,temperature,concentration,skin friction,heat transfer rate and mass transfer rate have been discussed in *** velocity and temperature profile deprives for larger We and an opposite trend is observed for *** radiation parameter is propositional to temperature and a counter behaviour is observed for Pr.

关键词： The present pagination reports both Brownian diffusion and thermophoresis aspects subject to magneto hydrodynamic Williamson fluid model. Assuming the flow is unsteady and blood is treated as Williamson fluid over a wedge with radiation. The governing equations are transformed into ordinary differential equations by using similarity variables. The analytical solutions of the transformed governing equations are obtained by using the RK 4th order method along with shooting technique solver. The effects of various physical parameters such as Hartmann number local Weissenberg number radiation parameter unsteadiness parameter Prandtl number Lewis number Brownian diffusion thermophoresis wedge angle parameter moving wedge parameter on velocity temperature concentration skin friction heat transfer rate and mass transfer rate have been discussed in detail. The velocity and temperature profile deprives for larger We and an opposite trend is observed for concentration. The radiation parameter is propositional to temperature and a counter behaviour is observed for Pr.

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Numerical study of magnetohydrodynamics(MHD)boundary layer slip flow of a Maxwell nanofluid over an exponentially stretching surface with convective boundary condition

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Propulsion and Power Research 2017年第4期6卷 259-268页

作者： P.Bala anki reddy S.Suneetha N.Bhaskar reddy Department of Mathematics S.A.S.VIT UniversityVellore 632014India Department of Applied Mathematics Yogi Vemana UniversityKadapa 516003India Department of Mathematics S.V.UniversityTirupati 517502India

This paper focuses on a theoretical analysis of a steady two-dimensional magnetohydrodynamic boundary layer flow of a Maxwell fluid over an exponentially stretching surface in the presence of velocity slip and convective boundary *** model is used for a nanofluid,which incorporates the effects of Brownian motion and *** resulting non-linear partial differential equations of the governing flow field are converted into a system of coupled non-linear ordinary differential equations by using suitable similarity transformations,and the resultant equations are then solved numerically by using Runge-Kutta fourth order method along with shooting technique.A parametric study is conducted to illustrate the behavior of the velocity,temperature and *** influence of significant parameters on velocity,temperature,concentration,skin friction coefficient and Nusselt number has been studied and numerical results are presented graphically and in tabular *** reported numerical results are compared with previously published works on various special cases and are found to be an in excellent *** is found that momentum boundary layer thickness decreases with the increase of magnetic *** can also be found that the thermal boundary layer thickness increases with Brownian motion and thermophoresis parameters.

关键词： Nano fluid Boundary layer Stretching sheet Magnetohydrodynamics(MHD) Brownian motion Thermophoresis parameter

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