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Lead-free silver niobate microparticles-loaded PDMS composite films for high-performance clip-like hybrid mechanical energy harvesters

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Journal of Materials Science & Technology 2024年第9期176卷 145-154页

作者： Mandar Vasant Paranjape Sontyana Adonijah Graham Punnarao Manchi Anand Kurakula 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

A triboelectric nanogenerator(TENG)is a highly potential green energy harvesting technology to power small-scale electronic *** the overall electricity production capacity of TENGs is a primary concern for their utilization as an electricity generator in day-to-day ***,we proposed a lead-free silver niobate(AgNbO_(3)(ANb))microparticles(MPs)-embedded polydimethylsiloxane(PDMS)composite film-based clip-like hybrid nanogenerator(HNG)device,producing an enhanced electrical output from the applied mechanical *** ANb MPs with a high dielectric constant were initially synthesized and embedded inside the PDMS polymer *** HNGs were fabricated utilizing ANb MPs/PDMS composite films/aluminum tape as negative/positive triboelectric films,respectively and operated in contact-separation *** electrical output from them was comparatively analyzed to investigate an optimum concentration of the ANb MPs inside the PDMS *** robust HNG with 5 wt%ANb MPs/PDMS composite film produced the highest electrical output with promising ***,three similar optimized HNGs were fabricated and integrated within a 3D-printed clip-like structure and the electrical output was thoroughly evaluated while combining multiple HNGs as well as from each independent *** clip-like HNG device exhibited an electrical output of 340 V and 20μA that can be further utilized to charge various capacitors and power portable *** to the high resilience structure of the clip-like HNG device,it was also demonstrated to harvest biomechanical energy produced by human movements into *** mechanical energy harvesting when the clip-like HNG device was attached to the accelerator pedal of the car and the pedal of a musical piano was successfully demonstrated.

关键词： AgNbO_(3)MPs Lead-free ANb MPs/PDMS composite film Dielectric material Clip-like HNG Biomechanical energy harvesting

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Ternary MOF‑Based Redox Active Sites Enabled 3D‑on‑2D Nanoarchitectured Battery‑Type Electrodes for High‑Energy‑Density supercapatteries

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Nano-Micro Letters 2021年第1期13卷 319-336页

作者： Goli Nagaraju SChandra Sekhar Bhimanaboina Ramulu SkKhaja Hussain DNarsimulu jae su yu Institute for Wearable Convergence Electronics Department of Electronic EngineeringKyung Hee University1732 Deogyeong‑daeroGihung‑guYongin‑siGyeonggi‑do 17104Republic of Korea Department of Chemical Engineering College of EngineeringKyung Hee University1732 Deogyeong‑daeroGihung‑guYongin‑siGyeonggi‑do 17104Republic of Korea

Designing rationally combined metal-organic frameworks(MOFs)with multifunctional nanogeometries is of significant research interest to enable the electrochemical properties in advanced energy storage ***,we explored a new class of binderfree dual-layered Ni-Co-Mn-based MOFs(NCM-based MOFs)with three-dimensional(3D)-on-2D nanoarchitectures through a polarityinduced solution-phase method for high-performance *** hierarchical NCM-based MOFs having grown on nickel foam exhibit a battery-type charge storage mechanism with superior areal capacity(1311.4μAh cm^−2 at 5 mA cm^−2),good rate capability(61.8%;811.67μAh cm^−2 at 50 mA cm^−2),and an excellent cycling *** superior charge storage properties are ascribed to the synergistic features,higher accessible active sites of dual-layered nanogeometries,and exalted redox chemistry of multi metallic guest species,*** bilayered NCM-based MOFs are further employed as a battery-type electrode for the fabrication of supercapattery paradigm with biomass-derived nitrogen/oxygen doped porous carbon as a negative electrode,which demonstrates excellent capacity of 1.6 mAh cm^−2 along with high energy and power densities of 1.21 mWh cm^−2 and 32.49 mW cm^−2,***,the MOF-based supercapattery was further assembled with a renewable solar power harvester to use as a self-charging station for various portable electronic applications.

关键词： Metal-organic frameworks Dual layers Redox chemistry supercapattery Renewable energy

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Facile one-step hydrothermal route to MSe/Mo_(3)Se_(4)(M:Zn,Mn,and Ni)-based electrode materials for ultralong-life hybrid supercapacitors

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Journal of Materials Science & Technology 2023年第25期156卷 230-240页

作者： B.N.Vamsi Krishna Obula Reddy Ankinapalli Ayyaluri Ramakrishna Reddy jae su yu Department of Electronics and Information Convergence Engineering Institute for Wearable Convergence ElectronicsKyung Hee UniversityYongin-siGyeonggi-do 17104Republic of Korea

Transition metal selenides have attracted great interest in electrochemical energy storage applications because of their good electrochemical activity and conductivity ***,we reported the metal molybdenum selenide(M Se/Mo_(3)Se_(4)(M:Zn,Mn,and Ni))electrode materials on their morphological and electrochemical properties by varying the metal ions via a facile hydrothermal *** effects of the structural,morphological,and surface area properties of the prepared powder materials on their electrochemical performance were *** to the hierarchical porous and unique interconnected structure,the nickel molybdenum selenide nanosheet spheres(NMS NSSs)-based electrode material delivered an excellent specific capacity value of 252 mAh g^(-1) at a current density of 1 Ag^(-1).Moreover,the optimized NMS NSSs electrode exhibited outstanding cycling stability with a capacity retention of 80%and a corresponding coulombic efficiency of 99%after 80,000 ***,a pouch-type hybrid supercapacitor(HSC)device was assembled using NMS NSSs material as a positive electrode and activated carbon as a negative electrode in 1 M aqueous KOH ***,the assembled HSC device exhibited superior energy and power density values as well as magnificent cycling *** real-time practical applications,light-emitting diodes and a digital display were powered using two series-connected HSC ***,the obtained tremendous results strongly suggest that the NiSe/Mo_(3)Se_(4) NSSs-based materials could be a promising electrode for ultralong-life energy storage applications.

关键词： Nickel selenides Molybdenum selenides Nanosheet spheres Ultralong-life cycling stability

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In situ deposited cobalt-magnesium selenates as an advanced electrode for electrochemical energy storage

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Journal of Magnesium and Alloys 2022年第12期10卷 3565-3575页

作者： Manchi Nagaraju S.Chandra Sekhar Bhimanaboina Ramulu Shaik Junied Arbaz jae su yu Department of Electronics and Information Convergence Engineering Kyung Hee University1732 Deogyeong-aeroGihung-guYongin-siGyeonggi-do 17104Republic of Korea

Currently,bimetallic selenates have attracted much attention as a prominent electrode composite material for supercapacitors owing to their higher redox chemistry and superior electrical ***,we synthesized cobalt-magnesium selenates (CoSeO3-Mg Se O4,CMS) via a facile hydrothermal process,followed by *** first,cobalt-magnesium oxide (Co2.32Mg0.68O4,CMO) was in situ prepared by a one-pot hydrothermal *** investigation on the morphological change was performed by synthesizing the same CMO samples at different growth times by keeping the temperature *** CMO electrode designed for 8 h of growth time (CMO-8 h)with an attractive morphology showed a higher areal capacity of 101.7μAh cm-2(at 3 m A cm-2) than the other CMO electrodes prepared for 6 and 10 *** exalted performance was achieved by the selenization of the CMO-8 h sample to form the CMS *** 3 m A cm-2,the resulted CMS exhibited nearly three times higher capacity,i.e.,385.4μAh cm-2,than the CMO-8 h ***,an asymmetric cell fabricated with CMS as a positive electrode also revealed good energy storage *** the applied voltage between 0 and 1.5 V,the asymmetric cell demonstrated maximum energy density of 0.159 m Wh cm-2(18.6 Wh kg-1) and maximum power density of 18.47 m W cm-2(1938 W kg-1),***,novel magnesium-based metal selenates can act as an efficient electrode for energy storage.

关键词： Co2.32Mg0.68O4 CoSeO3–MgSeO4 In situ formation Energy storage Asymmetric cell

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A facile one-step approach to hierarchically assembled core-shell-like MnO2@MnO2 nanoarchitectures on carbon fibers： An efficient and flexible electrode material to enhance energy storage

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Nano Research 2016年第5期9卷 1507-1522页

作者： Goli Nagaraju Yeong Hwan Ko sung Min Cha Sang Hyuk Im jae su yu Department of Electronics and Radio Engineering Institute for Wearable Convergence Electronics Kyung Hee University 1732 Deogyeong-daero Giheung-gu Yongin-si Gyeonggi-do 446-701 Republic of Korea Functional Crystallization Center (ERC) Department of Chemical Engineering Kyung Hee University 1732 Deogyeong-daeroGiheuncl-qu Yonqin-si Gyeonqqi-do 446-701 Republic of Korea

Hierarchical core-shell-like MnO2 nanostructures （NSs） were used to anchor MnO2 hexagonal nanoplate arrays （HNPAs） on carbon cloth （CC） fibers. The NSs were prepared by a novel one-step electrochemical deposition method. Under an external cathodic voltage of -2.0 V for 30 min, hierarchical core-shell-like MnO2-NS-decorated MnO2 HNPAs （MnO2 NSs@MnO2 HNPAs） were uniformly grown on CC with reliable adhesion. The phase purity and morphological properties of the samples were characterized by various physicochemical techniques. At a constant external cathodic voltage, growth of MnO2 NSs@MnO2 HNPAs on CC was carried for different time periods. When utilized as a flexible, robust, and binder-free electrode for pseudocapacitors, the hierarchical core-shell-like MnO2 NSs@MnO2 HNPAs on CC showed clearly enhanced electrochemical properties in 1 M Na2SO4 electrolyte solution. The results indicate that the MnO2 NSs@MnO2 HNPAs on CC have a maximum specific capacitance of 244.54 F/g at a current density of 0.5 A/g with excellent cycling stability compared to that of bare MnO2 HNPAs on CC （112.1 F/g at 0.5 A/g current density）. We believe that the superior charge storage performance of the pseudocapacitive electrode can be mainly attributed to the hierarchical MnO2 NSs@MnO2 HNPAs building blocks that have a large specific surface area, offering additional electroactive sites for efficient electrochemical reactions. The facile and single-step approach to growth of hierarchical pseudocapacitive materials on textile based electrodes opens up the possibility for the fabrication of high-performance flexible energy storage devices.

关键词： manganese oxide hierarchical structures carbon cloth electrochemical deposition energy storage properties

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Structural engineering of potassium vanadate cathode by pre-intercalated Mg_(2+) for high-performance and durable rechargeable aqueous zinc-ion batteries

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Journal of Magnesium and Alloys 2024年第9期12卷 3780-3793页

作者： Ashok Kumar Kakarla Hari Bandi Wasim Akram Syed R.Shanthappa 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

Aqueous zinc(Zn)-ion batteries(AZIBs)have the potential to be used in massive energy storage owing to their low cost,eco-friendliness,safety,and good energy *** research has been focused on enhancing the performance of AZIBs,but challenges ***-based oxides,known for their large interlayer spacing,are promising cathode *** this report,we synthesize Mg^(2+)-intercalated potassium vanadate(KVO)(MgKVO)via a single-step hydrothermal method and achieve a 12.2°Ainterlayer ***^(2+) intercalation enhances the KVO performance,providing wide channels for Zn^(2+),which results in high capacity and ion *** combined action of K^(+) and Mg^(2+) intercalation enhances the electrical conductivity of *** structural design endows MgKVO with excellent electrochemical *** AZIB with the MgKVO cathode delivers a high capacity of 457 mAh g^(-1) at 0.5 A g^(-1),excellent rate performance of 298 mAh g^(-1) at 5 A g^(-1),and outstanding cycling stability of 102%over 1300 cycles at 3 A g^(-1).Additionally,pseudocapacitance analysis reveals the high capacitance contribution and Zn^(2+)diffusion coefficient of ***,ex-situ X-ray diffraction,X-ray photoelectron spectroscopy,and Raman analyses further demonstrate the Zn^(2+)insertion/extraction and Zn-ion storage mechanisms that occurred during cycling in the battery *** study provides new insights into the intercalation of dual cations in vanadium oxides and offers new solutions for designing cathodes for high-capacity AZIBs.

关键词： Metal-ion intercalation Hydrothermal Rate capability Cathode Aqueous zinc-ion batteries

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Electrospun ZnSnO_(3)/PVDF‑HFP Nanofibrous Triboelectric Films for Efficient Mechanical Energy Harvesting

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Advanced Fiber Materials 2023年第5期5卷 1685-1698页

作者： Venkata Siva Kavarthapu Sontyana Adonijah Graham Punnarao Manchi Mandar Vasant Paranjape 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

Nowadays,triboelectric nanogenerators(TENGs)are one of the most emerging technologies owing to their easy and costeffective device *** can harvest mechanical energy from our living ***,we synthesized dielectric zinc tin oxide(ZnSnO_(3))nanoparticles(NPs)by a hydrothermal *** ZnSnO_(3)NPs provide a dielectric and piezoelectric effect,which can efficiently enhance the output electrical performance of the proposed *** prepared ZnSnO_(3)NPs were embedded into a polyvinylidene fluoride hexafluoropropylene(PVDF-HFP)polymer to prepare ZnSnO_(3)/PVDF-HFP nanofibrous films to fabricate a *** output performance of TENG was investigated and optimized by varying the loading concentration of ZnSnO_(3)NPs in PVDF-HFP fibrous *** highest voltage,current,charge density,and power density from the fabricated TENG were achieved as~138 V,~5μA,~52μC/m2,and~1.6 W/m2,***,the robustness of the TENG was studied via the long-term mechanical stability ***,the practical and real-time application of the TENG was demonstrated by harvesting mechanical energy to power low-power portable electronic ***,the materials used in the TENG were combined into a skipping rope to harvest biomechanical/mechanical energy while exercising.

关键词： s ZnSnO_(3)nanoparticles ZnSnO_(3)/PVDF-HFP fibrous films Triboelectric nanogenerators Mechanical energy harvesting

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Multifunctional core-shell-like nanoarchitectures for hybrid supercapacitors with high capacity and long-term cycling durability

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Nano Research 2019年第10期12卷 2597-2608页

作者： S.Chandra Sekhar Goli Nagaraju Bhimanaboina Ramulu Sk.Khaja Hussain D.Narsimulu jae su yu Department of Electronic Engineering Institute for Wearable Convergence ElectronicsKyungHee University1732 Deogyeong-daeroGihurtg-guYongin-siGyeonggi-do 17104Republic of Korea1 Department of Chemical Engineering College of EngineeringKyung Hee University1732 Deogyeong-daeroGihung-guYongin-siGyeonggi-do 17104Republic of Korea

Transition metal oxide/hydroxide with multif unctional hierarchical nano structures has attracted widespread attention in supercapacitors(SCs)because of their large accessible surface area,high electrochemical activity and superior redox ***,core-shell-like copper(Cu)hydroxide nano tube arrays grafted nickel aluminum layered double hydroxide n anosheets were facilely synthesized on porous Cu foam(CH NTAs@NiAI LDH NSs)for use as an efficient battery-type electrode in hybrid *** the synergistic effects of NiAl LDH NSs on well-adhered CH NTAs/CF,the core-shell-like composite(prepared for 24 h)delivered a maximum areal capacity of 334.3 pAh/cm2 at a current density of 3 mA/cm2 in 2 M KOH electrolyte,which is comparatively higher than other samples synthesized at different growth ***,the core-shell-like CH NTAs@NiAI LDH NSs-24 demonstrated an outstanding cycling stability of 134.3%after 10,000 *** high capacity and stability of CH NTAs@NiAI LDH NSs-24,a pouch-type hybrid SC was further assembled with core-shell-like composite as a positive electrode and reduced graphene oxide as a negative electrode with a filter paper as a separator in aqueous alkaline *** hybrid SC showed a high areal capacity of 250 pAh/cm2 at 2 mA/cm2 with maximum areal energy and power densities of 181.9 pWh/cm2 and 24,991.5 pW/cm2,*** harvest!ng the solar energy via solar cell panel and subsequently delivering the stored en ergy to switching and proximity applicati ons also dem on strated the real-time applicability of our hybrid SCs.

关键词： copper hydroxide layered double hydroxides core-shell hybrid supercapacitors energy density self-powered devices

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Micro‑supercapacitors Based on Fungi‑Derived Biocarbon Microfibers Infused with NiMoO Nanoparticles for Biomedical and E‑Skin Applications

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Advanced Fiber Materials 2024年第4期6卷 1008-1025页

作者： Shaik Junied Arbaz Bhimanaboina Ramulu jae su yu Department of Electronics and Information Convergence Engineering Institute for Wearable Convergence ElectronicsKyung Hee University1732 Deogyeong‑daeroGihung‑GuYongin 17104GyeonggiRepublic of Korea

In various biomedical fields,noninvasive medical procedures are favored over invasive techniques,as the latter require major incisions or surgeries that cause bleeding,pain,and tissue *** increased use of noninvasive biomedical equipment has created a demand for effective energy storage devices that are sufficiently compact to be used as a power source,easy to commercialize,and ***,we report the facile synthesis of nickel molybdenum oxide nanoparticle-infused biocarbon microfibers(NiMoO NPs@BCMFs)as a novel energy storage *** microfibers were derived from the bracket fungus Laetiporus *** a three-electrode system,the NiMoO NPs@BCMFs/nickel foam(NF)electrode delivered an areal capacity of 113µAh cm^(-2)at 1.5 mA cm^(-2),with excellent cycling *** capacity retention was 104%,even after 20,000 *** BCMFs were also synthesized from the fungal biomass to fabricate a negative BCMFs/NF ***,together with the positive NiMoO NPs@BCMFs/NF electrode,was used to construct a bio-friendly(hybrid-type)micro-supercapacitor(BMSC),which exhibited maximum energy and power density values of 56µWh cm^(-2)and 11,250µW cm^(-2),*** tested for its ability to power biomedical electronics,the BMSC device successfully operated an electrical muscle stimulator,inducing potential signals into a volunteer in real-time application.

关键词： Transition metal oxide Biocarbon microfibers Micro-supercapacitor Wearable electronics Biomedical electronics

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surface Patterning of Metal Zinc Electrode with an In‑Region Zincophilic Interface for High‑Rate and Long‑Cycle‑Life Zinc Metal Anode

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Nano-Micro Letters 2024年第6期16卷 192-209页

作者： Tian Wang Qiao Xi Kai Yao yuhang Liu Hao Fu Venkata Siva Kavarthapu Jun Kyu Lee Shaocong Tang Dina Fattakhova‑Rohlfing Wei Ai jae su yu Department of Electronics and Information Convergence Engineering Institute for Wearable Convergence ElectronicsKyung Hee UniversityYongin‑siGyeonggi‑do 17104Republic of Korea Frontiers Science Center for Flexible Electronics(FSCFE)and Shaanxi Institute of Flexible Electronics(SIFE) Northwestern Polytechnical University(NPU)127 West Youyi RoadXi’an 710072People’s Republic of China Institute of Energy and Climate Research:Materials Synthesis and Processing(IEK‑1) Forschungszentrum Julich GmbH52425 JulichGermany School of Chemical Engineering Sungkyunkwan University2066 Seobu‑RoJangan‑GuSuwon‑siGyeonggi‑doRepublic of Korea

The undesirable dendrite growth induced by non-planar zinc(Zn)deposition and low Coulombic efficiency resulting from severe side reactions have been long-standing challenges for metallic Zn anodes and substantially impede the practical application of rechargeable aqueous Zn metal batteries(ZMBs).Herein,we present a strategy for achieving a high-rate and long-cycle-life Zn metal anode by patterning Zn foil surfaces and endowing a Zn-Indium(Zn-In)interface in the *** accumulation of electrons in the microchannel and the zincophilicity of the Zn-In interface promote preferential heteroepitaxial Zn deposition in the microchannel region and enhance the tolerance of the electrode at high current ***,electron aggregation accelerates the dissolution of non-(002)plane Zn atoms on the array surface,thereby directing the subsequent homoepitaxial Zn deposition on the array ***,the planar dendrite-free Zn deposition and long-term cycling stability are achieved(5,050 h at 10.0 mA cm^(−2) and 27,000 cycles at 20.0 mA cm^(−2)).Furthermore,a Zn/I_(2) full cell assembled by pairing with such an anode can maintain good stability for 3,500 cycles at 5.0 C,demonstrating the application potential of the as-prepared ZnIn anode for high-performance aqueous ZMBs.

关键词： Zn metal anode surface patterning Directional Zn deposition Aqueous Zn-I_(2)batteries

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