【摘 要】
：
An eco-friendly,new,and controllable approach for the preparation of manganese oxide (α-MnO2) nanor-ods has been introduced using hydrothermal reaction for supercapacitor application.The in-depth crystal structure analysis of α-MnO2 is analyzed by X-ray R
【机 构】
：
Department of Materials Science and Engineering and Chemical Engineering,Universidad Carlos Ⅲ de Mad
论文部分内容阅读
An eco-friendly,new,and controllable approach for the preparation of manganese oxide (α-MnO2) nanor-ods has been introduced using hydrothermal reaction for supercapacitor application.The in-depth crystal structure analysis of α-MnO2 is analyzed by X-ray Rietveld refinement by using FullProf program with the help of pseudo-Voigt profile function.The developed α-MnO2 electrode attains a remarkable capacitance of 577.7 F/g recorded at a current density value of 1 A/g with an excellent cycle life when is used for 10,000 repeated cycles due to the porous nanorod-morphology assisting the ease penetration of elec-trolyte ions into the electroactive sites.The diffusive and capacitive contributions of the electrode have been estimated by considering standard numerical packages in Python.After successfully assembling the aqueous symmetric supercapacitor (SSC) cell by utilizing the as-prepared α-MnO2,an excellent capacitance of 163.5 F/g and energy density of 58.1 Wh/kg at the constant current density of 0.5 A/g are obtained with an expanded potential frame of 1.6 V.Moreover,the cell has exceptionally withstood up to 10,000 cycles with an ultimate capacitance retention of 94.1％ including the ability to light an LED for 18 s.Such findings recommend the developed α-MnO2 electrode to be a highly felicitous electrode for the field of energy storage.
其他文献
In this work,a covalent organic framework (COF),which is constructed by the building blocks of[5,10,15,20-tetrakis(4-aminophenyl)porphinato]copper(Ⅱ) (CuTAPP) and p-benzaldehyde,is employed to integrate with TiO2 for the purpose of establishing a Z-scheme
Transition metal cation ordering is essential for controlling the electrochemical performance of cubic spinel LiNi0.5Mn1.5O4 (LNMO),which is conventionally adjusted by optimizing the high temperature sin-tering and annealing procedures.In this present wor
As an effective and competitive supplement to the commercial-ized lithium ion batteries (LIBs),sodium ion batteries (SIBs) have been receiving increasing attention in recent years due to lower cost,richer content,and broader distribution of sodium [1-7].S
IntroductionrnIn a joint contribution among many Chinese research Institutes,a recent paper published on Nature Catalysis reported the use of sulfur vacancy-rich MoS2 as a novel catalyst for the hydrogenation of CO2 to methanol[1].A commentary on this pap
Thermoelectric devices enable direct conversion between thermal and electrical energy.Recent studies have indicated that the thin film/substrate heterostructure is effective in achieving high thermoelectric performance via decoupling the Seebeck coefficie
The research and exploration of manganese-based aqueous zinc-ion batteries have been controversial of cycle stability and mechanism investigation,thus improving the stability and exploring storage mecha-nism are still the most main issue.Defect engineerin
In the electrochemical process,Pt nanoparticles (NPs) in Pt-based catalysts usually agglomerate due to Oswald ripening or lack of restraint,ultimately resulting in reduction of the active sites and catalytic effi-ciency.How to uniformly disperse and firml
Constructing high-performance electrodes with both wide potential window (e.g.≥ 2 V in aqueous elec-trolyte) and excellent mechanical flexibility represents a great challenge for supercapacitors.Because of the outstanding conductivity and flexibility,carb
Single-atom site catalysts (SACs) have made great achievements due to their nearly 100％ atomic utiliza-tion and uniform active sites.Regulating the surrounding environment of active sites,including electron structure and coordination environment via atom-
Multivalent metal-sulfur (M-S,where M =Mg,Al,Ca,Zn,Fe,etc.) batteries offer unique opportunities to achieve high specific capacity,elemental abundancy and cost-effectiveness beyond lithium-ion batteries(LIBs).However,the slow diffusion of multivalent-meta