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Electrochemical performance of a symmetric supercapacitor device designed using laser-induced multilayered graphene

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新型炭材料(中英文) 2024年

作者： Gargi Dhiman Kavita Kumari Bon-Heun Koo Faheem Ahmed Nagih M.Shaalan Saurabh Dalela Parvez A.Alvi Ranjeet Kumar Brajpuriya Shalendra Kumar department of Physics School of Advanced EngineeringUPES Industrial technology Research institute Changwon National University Changwon department of applied Sciences and humanities Faculty of Engineering and Technology Jamia Millia Islamia department of Physics College of Science King Faisal University Physics department Faculty of Science Assiut University department of Pure & applied Physics University of Kota department of Physical Science

This study demonstrates a facile and economical approach for fabricating laser-induced graphene（LIG）, which results in improved electrochemical performance. Polyimide polymer was used as a starting material for LIG synthesis and irradiated under ambient conditions using a CO2laser. The prepared LIG samples were characterized by Raman spectroscopy and FTIR, which validated the formation of multilayered graphene containing sp2 hybridized C=C bonds. The FE-SEM revealed three-dimensional sheetlike structures, while HR-TEM images displayed lattice planes with an interplanar spacing of approximately 0.33 nm, corresponding to the（002） plane of graphene. The electrochemical performance of the as-prepared LIG samples demonstrated a remarkable areal specific capacitance（CA） of 51 mF cm-2(170 F g-1) at 1 mA cm-2(3.3 A g-1) in a three-electrode configuration with 1M KOH as the aqueous electrolyte. The LIG electrodes produced an energy density of ～3.5 μWh cm-2and a power density of ～350 μW cm-2,demonstrating significant energy storage capabilities. Additionally, the electrodes exhibited excellent cyclic stability, retaining 87%of their specific capacitance after 3 000 cycles at 1 mA/cm2. The symmetric supercapacitor fabricated with LIG electrodes and the tested 1M KOH electrolyte showed a specific capacitance of 23 mF cm-2and maintained excellent retention after 10,000 cycles,showing LIG's potential for supercapacitor applications.

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Mathematical modeling of atmospheric internal waves phenomenon and its solution by Elzaki Adomian decomposition method

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Journal of Ocean Engineering and Science 2022年第3期7卷 203-212页

作者： Archana C.Varsoliwala Twinkle R.Singh applied mathematics and humanities department Sardar Vallabhbhai National Institute of TechnologySurat395007GujaratIndia

This article involves the study of atmospheric internal waves phenomenon,also referred to as gravity *** phenomenon occurs inside the fluid,not on the *** model is based on a shallow fluid hypothesis represented by a system of nonlinear partial differential *** basic assumption of the shallow flow model is that the horizontal size is much larger than the vertical *** internal waves can be perfectly represented by this model as the waves are spread over a large horizontal *** we used the Elzaki Adomian Decomposition Method(EADM)to obtain the solution for the considered model along with its convergence *** Adomian decomposition method together with the Elzaki transform gives the solution in a convergent series without any linearization or *** are built between the results obtained by EADM and HAM to examine the accuracy of the proposed method.

关键词： Atmospheric internal waves Shallow-fluid equations System of nonlinear PDEs Elzaki Adomian decomposition method Climate prediction

Mathematical modeling of tsunami wave propagation at mid ocean and its amplification and run-up on shore

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Journal of Ocean Engineering and Science 2021年第4期6卷 367-375页

作者： Archana C.Varsoliwala Twinkle R.Singh applied mathematics and humanities department Sardar Vallabhbhai National Institute of TechnologySurat 395007GujaratIndia

The paper deals with the study of the mathematical model of tsunami wave propagation along a coast-line of an *** model is based on shallow-water assumption which is represented by a system of non-linear partial differential *** this study,we employ the Elzaki Adomian Decomposition Method(EADM)to successfully obtain the solution for the proposed model for different coastal slopes and ocean *** tsunami wave velocity and run-up height are affected by the coast slope and sea depth are *** Adomian Decomposition Method together with Elzaki transform allows for solutions,without the need of any linearization or perturbation,in the form of rapidly converging *** obtained numerical results for tsunami wave height and velocity are very close match to the real physical phenomenon of tsunami.

关键词： Tsunami wave propagation Run-up height Shallow water equations Elzaki Adomian Decomposition Method Convergence analysis

A robust computational approach for Zakharov-Kuznetsov equations of ion-acoustic waves in a magnetized plasma via the Shehu transform

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Journal of Ocean Engineering and Science 2023年第1期8卷 79-90页

作者： Parthkumar P.Sartanpara Ramakanta Meher department of mathematics and humanities Sardar Vallabhbhai National Institute of TechnologySuratGujarat395007 India

The application of the q-homotopy analysis Shehu transform method(q-HAShTM)to discover the esti-mated solution of fractional Zakharov-Kuznetsov equations is investigated in this *** the presence of a uniform magnetic field,the Zakharov-Kuznetsov equations regulate the behaviour of nonlinear acoustic waves in a plasma containing cold ions and hot isothermal *** q-HAShTM is a stable analytical method that combines homotopy analysis and the Shehu *** q-homotopy investigation Shehu transform is a constructive method that leads to the Zakharov-Kuznetsov equations,which regulate the propagation of nonlinear ion-acoustic waves in a *** is a more semi-analytical method for adjust-ing and controlling the convergence region of the series solution and overcoming some of the homotopy analysis method’s limitations.

关键词： Zakharov-Kuznetsov equations q-Homotopy analysis Shehu transform method Shehu transform Caputo fractional derivatives

A robust fuzzy-fractional approach for the atmospheric internal wave model

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Journal of Ocean Engineering and Science 2023年第3期8卷 308-322页

作者： Parthkumar P.Sartanpara Ramakanta Meher department of mathematics and humanities Sardar Vallabhbhai National Institute of TechnologySuratGujarat 395007India

The study of internal atmospheric waves,also known as gravity waves,which are detectable inside the fluid rather than at the fluid surface,is presented in this *** have used the time-fractional and fuzzy-fractional techniques to solve the differential equation system representing the atmospheric inter-nal waves *** q-Homotopy analysis Shehu transform technique(q-HAShTM)is used to solve the *** method helps find convergent solutions since it helps solve nonlinearity,and the fractional derivative can be easily computed using the Shehu ***,the obtained solution is compared for the particular case ofα=1 with the HAM solution to explain the method’s accuracy.

关键词： Atmospheric internal wave Fractional differential equation Fuzzy-fractional differential equation q-Homotopy analysis Shehu transform method

Optoelectronic and thermoelectric properties of spinel chalcogenides HgLa2X4（X=S and Se）:A first-principles study

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Journal of Rare Earths 2024年第10期 1927-1936页

作者： Aparna Dixit Inas A.Ahmed Jisha Annie Abraham Zeinhom M.El-Bahy Mumtaz Manzoor Sajad Ahmad Dar Ramesh Sharma department of Basic Science and humanities Pranveer Singh Institute of Technology department of Chemistry Faculty of ScienceKing Khalid University department of Physics National Defence Academy department of Chemistry Faculty of ScienceAl-Azhar University institute of Physics Slovak Academy of Sciences department of Physics Motilal Vigyan Mahavidyalya College department of applied Science Feroze Gandhi Institute of Engineering and Technology

We investigated spinel chalcogenides HgLa2（S/Se）4by using density function theory,and scrutinized the structural,optical,electrical,mechanical and thermoelectric transport characteristics of HgLa2（S/Se）4spinel *** enthalpy of formation,energy of cohesion,and energy volume optimum plots were used to obtain the stability as well as the perfect ground state of these *** ductility of these materials was the best illustrated with the help of Poisson's and Pugh's *** band gap results were obtained using Trans and Blaha modified Becke-Johanson potential（TB-mBJ）.Both the materials present semi-conducting nature with direct band gap equal to 1.449 and 0.892 eV respectively for HgLa2S4and *** were also made for optical characteristics with the values of dielectric function,absorption coefficient,optical conductivity,reflectivity,and refractive *** to the findings,both of these materials are suitable for infrared optoelectronic *** materials were found to have promising optoelectronic and thermoelectric applications after their optical properties and transport aspects were *** tiny levels of temperature conductivities,substantial am ounts of power conductivities,the figure of merit（more than unity）,as well as Seebecs coefficients all point to the potential use of both the materials in thermoelectric power generators.

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Spectroscopic properties of Δ baryons

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Chinese Physics C 2021年第2期45卷 119-125页

作者： Chandni Menapara Zalak Shah Ajay Kumar Rai department of applied Physics Sardar Vallabhbhai National Institute of TechnologySurat-395007GujaratIndia

The resonance state of theΔ baryon,which exists in four isospin(I=3/2)states,has been studied using the hypercentral constituent quark model(hCQM)with a simple linear potential with added first order *** calculated data ranges for 1S-5S,1P-5P,1D-4D and 1F-2F are given,with possible spin-parity assignments for all the *** magnetic moments have also been obtained for all four ***\pidecay channel width has been calculated for a few *** linear nature of the data has been verified through Regge trajectories.

关键词： mass spectra light baryon magnetic moment Regge trajectory

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Spectroscopy of light N~* baryons

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Chinese Physics C 2019年第3期43卷 49-55页

作者： Zalak Shah Keval Gandhi Ajay Kumar Rai department of applied Physics Sardar Vallabhbhai National Institute of Technology

We present the masses of N baryons up to 3300 MeV. The radial and orbital excited states are determined using hypercentral constituent quark model with the first-order correction. The obtained masses are compared with the experimental results and other theoretical predictions. The Regge trajectories are also determined in(n, M^2) and(J, M^2) planes. Moreover, the magnetic moments with J^p =(1^+/2,1^-/2) are calculated. We also calculates the Nπ decay width of excited nucleons.

关键词： baryons potential model Regge trajectories

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Non-iterative Cauchy kernel-based maximum correntropy cubature Kalman filter for non-Gaussian systems

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Control Theory and technology 2022年第4期20卷 465-474页

作者： Aastha Dak Rahul Radhakrishnan department of Electrical Engineering Sardar Vallabhbhai National Institute of TechnologySuratGujarat 395007India

This article addresses the nonlinear state estimation problem where the conventional Gaussian assumption is completely ***,the uncertainties in process and measurements are assumed non-Gaussian,such that the maximum correntropy criterion(MCC)is chosen to replace the conventional minimum mean square error ***,the MCC is realized using Gaussian as well as Cauchy kernels by defining an appropriate cost *** results demonstrate the superior estimation accuracy of the developed estimators for two nonlinear estimation problems.

关键词： Maximum correntropy criterion Cubature Kalman filter Non-Gaussian noise Cauchy kernel Gaussian kernel