01831nas a2200265 4500008004100000022001400041245012300055210006900178260000900247300001100256490000800267520095300275653001501228653002201243653002601265653001901291653002201310100001901332700001901351700001801370700001601388700001801404700001801422856012501440 2021 eng d a0169-433200aBimetallic ZnFe2O4 nanosheets prepared via electrodeposition as binder-free high-performance supercapacitor electrodes0 aBimetallic ZnFe2O4 nanosheets prepared via electrodeposition as  cSEP  a1499510 v5593 a

Binder-free bimetallic ZnFe2O4 nanosheets were fabricated using one-step electrodeposition, which facilitated excellent electrical contact between the ZnFe2O4 nanosheets and the nickel substrate. The resultant numerous ZnFe2O4 nanosheets with their cubic spinel structures promote interfacial activity to enhance the electrochemical and Faradaic redox reactions. The metallic Zn and Fe from the cubic spinel structure of ZnFe2O4 attract electrolytic ions and increase the energy-storage capability, thus yielding a specific capacitance of 1093 F.g(-1) at a current rate of 1 A.g(-1). Different samples were prepared by varying the amount of metal salts in the electrodeposition solution while maintaining a constant ZnNt:FeSO4 concentration ratio of 1:2 for all cases. The optimal electrode composition, which yielded an energy density of 54 Wh.kg(-1) and a capacitance retention of 93.5% at N = 5000 charge-discharge cycles, was identified.

10aBimetallic10aElectrodeposition10aEnergy storage device10asupercapacitor10aZnFe2O4 nanosheet1 aJoshi, Bhavana1 aSamuel, Edmund1 aPark, Chanwoo1 aKim, Yongil1 aLee, Hae-Seok1 aYoon, Sam, S. uhttps://library.ncl.res.in/content/bimetallic-znfe2o4-nanosheets-prepared-electrodeposition-binder-free-high-performance01788nas a2200277 4500008004100000022001400041245012300055210006900178260001000247300001100257490000800268520085600276653001801132653002001150653002901170653002901199100001901228700001901247700001601266700001801282700001901300700002301319700001801342700001801360856013201378 2021 eng d a0169-433200aCotton fabric decorated with manganese oxide nanorods as a supercapacitive flexible electrode for wearable electronics0 aCotton fabric decorated with manganese oxide nanorods as a super cDEC 1 a1509680 v5683 aWe present the fabrication (using a hydrothermal process) and the properties of wearable fabrics decorated with ultrathin manganese oxide (MnO2) nanorods for supercapacitor applications. The superior mechanical durability of the supercapacitor was confirmed by cyclic voltammetry (CV) curves, which showed little change during 1000 bending cycles. The pseudocapacitive properties of the ultrathin MnO2 nanorods were confirmed by recording the CV curves at various scan rates. The galvanostatic charge-discharge curves at various specific currents confirmed the pseudocapacitance of MnO2. The ultrathin MnO2 nanorods exhibited a superior capacitance of 508 F.g(-1) and an energy density of 35.3 Wh.kg(-1). The MnO2 electrode with optimal properties demonstrated stable long-term cycling performance with 90% retention after 10,000 galvanostatic cycles.10aCotton fabric10aManganese oxide10aUltrafine nanostructures10aWearable supercapacitors1 aSamuel, Edmund1 aJoshi, Bhavana1 aKim, Yongil1 aPark, Chanwoo1 aAldalbahi, Ali1 aEl-Newehy, Mohamed1 aLee, Hae-Seok1 aYoon, Sam, S. uhttps://library.ncl.res.in/content/cotton-fabric-decorated-manganese-oxide-nanorods-supercapacitive-flexible-electrode-wearable11115nas a2200193 45000080041000002450121000412100069001622600009002313000011002404900008002515201043200259100001610691700001910707700001910726700001810745700001810763700001810781856012210799 2021 eng d00aFlexible metallized carbon nanofibers decorated with two-dimensional NiGa2S4 nanosheets as supercapacitor electrodes0 aFlexible metallized carbon nanofibers decorated with twodimensio cSEP  a1304970 v4203 a

Herein, high-power flexible supercapacitor electrodes were fabricated by decorating Ni-electroplated carbon nanofibers (Ni@CNF) with two-dimensional NiGa2S4 nanosheets. The electrical conductivity of carbon nanofibers was enhanced by the addition of nickel, and the energy storage capability was enhanced by decoration with NiGa2S4. The impact of metal (Ni/Ga) ratio on the overall electrochemical performance of the supercapacitor was studied by varying the Ga concentration. The NiGa2S4 nanosheets promoted diffusion of the electrolyte into the electrode, thereby improving the electrochemical activity. The nanosheets also intensified the charge transfer rate within the composite electrode, which contributed to the overall improvement in the electrochemical performance. The optimal Ga concentration was the concentration at which the specific capacitance was the highest at 488 F·g−1 with a potential window of 1.1 V and current rate of 0.5 A·g−1. The long-term stability test revealed that the capacitance retention of the electrode with this optimal Ni/Ga ratio was 109% after 20,000 cycles. This flexible supercapacitor electrode was subjected to 2000 bending cycles, and the corresponding cyclic voltammetry performance was assessed. In combination, the outstanding electrochemical performance and durable mechanical properties render the NiGa2S4/Ni@CNF electrode highly suitable for flexible energy storage applications.

1 aKim, Yongil1 aSamuel, Edmund1 aJoshi, Bhavana1 aPark, Chanwoo1 aLee, Hae-Seok1 aYoon, Sam, S. uhttps://library.ncl.res.in/content/flexible-metallized-carbon-nanofibers-decorated-two-dimensional-niga2s4-nanosheets02180nas a2200277 4500008004100000022001400041245010800055210006900163260000800232300001600240490000700256520127800263653002001541653002701561653002401588653001901612653001201631100001901643700001901662700001601681700001601697700002301713700001901736700001801755856012901773 2022 eng d a0363-907X00aElectrospun zinc-manganese bimetallic oxide carbon nanofibers as freestanding supercapacitor electrodes0 aElectrospun zincmanganese bimetallic oxide carbon nanofibers as  cDEC a22100-221120 v463 a

Flexible, lightweight, and freestanding zinc-manganese oxide carbon nanofibers are promising materials for the fabrication of portable electronic devices. Composite nanofibers were synthesized using terephthalic acid and sodium dodecyl sulfate. Terephthalic acid improves the flexibility of the composite fibers and facilitates the diffusion of electrolytic ions. Meanwhile, sodium dodecyl sulfate aids to elevate the metal (zinc) oxide particles to the surface of the nanofibers during annealing. The texturing of the carbon nanofiber surface with ZnO enhances the electrochemical activity of the composite fibers. Parametric studies were conducted by varying the weight ratio of zinc and manganese acetates from zero to unity. The optimal case with a ratio of 0.75 produces specific capacitances of 1080 and 817 F center dot g(-1) at current densities of 1 and 10 A center dot g(-1), respectively, with a wide potential window of 1.6 V, indicating outstanding energy storage capabilities. The capacitance retention was 92% after 10 000 galvanostatic charge-discharge cycles. The bending angle test confirmed the mechanical durability of the freestanding carbon nanofiber electrodes, and the corresponding change in the cyclic voltammetry curve was negligible.

10aelectrospinning10afreestanding electrode10ahigh-energy-density10asupercapacitor10aZnMn2O41 aJoshi, Bhavana1 aSamuel, Edmund1 aKim, Yongil1 aKim, Taegun1 aEl-Newehy, Mohamed1 aAldalbahi, Ali1 aYoon, Sam, S. uhttps://library.ncl.res.in/content/electrospun-zinc-manganese-bimetallic-oxide-carbon-nanofibers-freestanding-supercapacitor01720nas a2200229 4500008004100000022001400041245006400055210006300119260000800182300001600190490000700206520103000213653002101243653001101264653002401275653003001299653000701329100002001336700001901356700001901375856009601394 2022 eng d a0272-884200aFormation of zircon-type DyCrO4 and its magnetic properties0 aFormation of zircontype DyCrO4 and its magnetic properties cSEP a24666-246760 v483 a

The formation mechanism of hydrolytic sol-gel synthesized DyCrO4 with a complexing agent in acidic and basic mediums is thoroughly studied. The role of complexing agents and pH on phase formation temperature is also intensively investigated. The formation temperature for DyCrO4 is similar to 500 degrees C in the absence and presence of complexing agents such as oxalic acid and ethylenediaminetetraacetic acid (EDTA) at pH 10. When critic acid is used, the DyCrO4 forms with Cr2O3 impurity. The crystallite size in the presence of a complexing agent in the basic medium is similar to 55 nm which is small as compared to only ammonia solution. The various reaction modes lead to tetragonal zircon-type DyCrO4 at similar to 500 degrees C, transforming into orthorhombic perovskite DyCrO3 at 800 degrees C. The magnetization curve shows the ferromagnetic behavior of DyCrO4 below transition temperature T-c similar to 21 K. This low T-c makes nanocrystalline DyCrO4 a potential material for cryogenic applications.

10aComplexing agent10aDyCrO410aFormation mechanism10aHydrolytic sol-gel method10apH1 aUghade, Supriya1 aJoshi, Bhavana1 aPoddar, Pankaj uhttps://library.ncl.res.in/content/formation-zircon-type-dycro4-and-its-magnetic-properties02189nas a2200277 4500008004100000022001400041245011600055210006900171260000900240300001100249490000800260520129600268653002201564653001301586653001501599653001501614653002001629653001301649100001901662700001901681700001701700700002501717700002201742700001801764856012901782 2022 eng d a1385-894700aProgress and potential of electrospinning-derived substrate-free and binder-free lithium-ion battery electrodes0 aProgress and potential of electrospinningderived substratefree a cFEB  a1328760 v4303 aCarbon nanofibers derived from electrospun precursors show great promise for electronic applications owing to their flexibility, conductivity, high surface area, and open structure. The integration of metal oxides and sulfides in carbon nanofibers, rather than using them with other binders, eliminates many problems caused by poor adhesion, nanomaterial agglomeration, excess mass contributed by inactive binders, and low conductivity of embedded active materials. The engineering of electrospun fibers with novel morphologies, such as core-shell, hollow, or porous structures, and the use of decorated carbon nanofibers (e.g., by electrodeposition or co precipitation) are discussed in this review. Representative schematic illustrations of the lithium-storage mechanism for these binder-free electrodes are presented. We describe how the electrospinning technique can offer a cost-effective strategy for fabrication of lightweight lithium-ion batteries with high capacity and excellent bendability. This review presents the fascinating morphologies of these specially designed carbon nanofiber electrodes, which enhance the electrochemical performance of metal oxides and sulfides, illustrating their enormous potential for use in wearable electronic devices and hybrid electric vehicles.10aCarbon nanofibers10aCo-axial10acomposites10acore-shell10aelectrospinning10aFlexible1 aJoshi, Bhavana1 aSamuel, Edmund1 aKim, Yong-il1 aYarin, Alexander, L.1 aSwihart, Mark, T.1 aYoon, Sam, S. uhttps://library.ncl.res.in/content/progress-and-potential-electrospinning-derived-substrate-free-and-binder-free-lithium-ion02650nas a2200301 4500008004100000022001400041245011700055210006900172260000900241300001100250490000800261520170500269653002201974653001301996653001502009653001502024653002002039653001302059653001102072653001902083100001902102700001902121700001702140700002502157700002202182700001802204856012602222 2022 eng d a0010-854500aReview of recent progress in electrospinning-derived freestanding and binder-free electrodes for supercapacitors0 aReview of recent progress in electrospinningderived freestanding cJUN  a2144660 v4603 a

The versatile electrospinning technique is scalable and suitable to fabricate highly conducting freestanding carbon nanofiber composite electrodes for energy storage devices. Freestanding/flexible electrodes hold enormous potential for use in wearable electronic devices. Carbon-yielding polymers and the optimal use of sacrificial polymers, metal oxides, and sulfides retain the flexibility and enhance the surface area and pseudocapacitance of electrodes. Both as-prepared electrospun fibers and carbonized nanofibers are compatible with surface decoration via various chemical and electrochemical routes. Metal oxides/sulfides with various morphologies, such as nanocones and nanosheets, can be grown on the carbon nanofibers or on the as-prepared electrospun fibers using chemical synthesis methods such as electro-deposition, hydrothermal processes, and chemical impregnation to enhance the pseudocapacitance of the electrodes. Similarly, the deposition of metal organic frameworks on as-prepared electrospun fibers embellishes these fibers with nanostructures of specific morphologies such as dodecahedral and spindle-shaped structures. Under optimal conditions, these morphologies do not hamper the flexibility of the fibers, and binders are not required to retain them or maintain the electrode integrity. The engineering of electrodes with various morphologies and process parameters is presented systematically. Electrospinning-derived electrodes that have demonstrated significant electrochemical performance are highlighted and critically analyzed, and the energy storage mechanisms of these supercapacitors are described in detail. (C) 2022 Elsevier B.V. All rights reserved.

10aCarbon nanofibers10aCo-axial10acomposites10acore-shell10aelectrospinning10aFlexible10aPorous10asupercapacitor1 aJoshi, Bhavana1 aSamuel, Edmund1 aKim, Yong-il1 aYarin, Alexander, L.1 aSwihart, Mark, T.1 aYoon, Sam, S. uhttps://library.ncl.res.in/content/review-recent-progress-electrospinning-derived-freestanding-and-binder-free-electrodes02851nas a2200277 4500008004100000022001400041245009800055210006900153260000800222300001400230490000700244520195500251653002002206653001802226653002502244653002802269653001902297100001902316700001902335700001802354700001902372700002302391700001802414700001802432856012302450 2022 eng d a0363-907X00aWearable fabric supercapacitors based on CNTs and polyhedral ZnO with a wide potential window0 aWearable fabric supercapacitors based on CNTs and polyhedral ZnO cMAY a8186-82000 v463 a

Wearable electronic devices such as health monitors, sensors, and e-skin can be powered by lightweight, high-power supercapacitors. Using a binder-free and low-temperature hydrothermal method, polyhedral ZnO nanoparticles were grown on carbon nanotube (CNT)-decorated cotton fabric, which is friendly to human skin and highly wearable, inexpensive, and thus commercially viable. The concentration of the starting material, zinc acetate, was varied to optimize the electrochemical performance. The evenly spaced polyhedral ZnO facilitated efficient permeation of the electrolyte into the active material. The fabric filaments were decorated with CNTs to enhance electron transfer and the overall electrochemical processes. The symmetric cell comprised of cotton fabric decorated with ZnO polyhedron/CNT showed no discernible change in the cyclic voltammetry curves even after 500 bending cycles, demonstrating the mechanical durability of the electrode. The potential window of 1.6 V using a Na2SO4/K2SO4 aqueous dual-ion electrolyte improved the long-term electrochemical stability and increased the energy storage capacity. The capacitance retention was 94% after 5000 cycles at a current density of 1 A center dot g(-1), indicating long-term electrochemical stability. A specific capacitance of 375 F center dot g(-1) at a current density of 5 A center dot g(-1) and energy density of 33.3 Wh center dot kg(-1) at a power density of 2000 W center dot kg(-1) were recorded for the optimized electrode. Highlights Polyhedral ZnO was grown on cotton fabric using a hydrothermal process. The electrochemical performance was optimized by varying the zinc acetate concentration. The highest specific capacitance was 375 F center dot g(-1) at a current density of 5 A center dot g(-1). Under optimal conditions, the capacitance retention was 94% at N = 5000 cycles. The energy density of the electrode was as high as 33.3 Wh center dot kg(-1).

10acarbon nanotube10aCotton fabric10ahydrothermal process10awearable supercapacitor10aZnO polyhedron1 aSamuel, Edmund1 aJoshi, Bhavana1 aPark, Chanwoo1 aAldalbahi, Ali1 aEl-Newehy, Mohamed1 aLee, Hae-Seok1 aYoon, Sam, S. uhttps://library.ncl.res.in/content/wearable-fabric-supercapacitors-based-cnts-and-polyhedral-zno-wide-potential-window02127nas a2200169 4500008004100000022001400041245015200055210006900207260000900276300001600285490000700301520146600308100001801774700001901792700001901811856012701830 2023 eng d a0743-746300aFerroelectric polarization and iron substitution synergistically boost electrocatalytic oxygen evolution reaction in bismuth oxychloride nanosheets0 aFerroelectric polarization and iron substitution synergistically cAUG  a11414-114250 v393 a

Ferroelectric materials have gained significant interestin variouskinds of water splitting, but the study of ferroelectric materialsfor electrocatalytic water splitting is in its infancy. Ferroelectricmaterials have spontaneous polarization below their Curie temperaturedue to dipolar alignment, which results in surface charges. In 2Dferroelectric materials, spontaneous polarization depends on thickness.Herein, we report that thickness-dependent ferroelectric polarizationin 2D nanosheets can also accelerate the oxygen evolution reaction(OER) along with the tailored active surface area of exposed crystallinefacets, which improves the electrocatalytic activity relatively. Iron-substitutedBiOCl nanosheets of varying thickness are fabricated by varying thepH using a facile coprecipitation method. The substituted iron enhancespolarization and electrochemical active sites on the surface. Thefindings in this study show that the exposed (001) facet and higherthickness of the nanosheets have high ferroelectric polarization and,in turn, superior electrocatalytic activity and remarkable stability,requiring low overpotentials (348 mV and 270 mV at 100 mA/cm(2) and 10 mA/cm(2)) in alkaline (1.0 M KOH) electrolyte. Asthe thickness of the nanosheets is decreased from 140 to 34 nm, theelectrocatalytic performance of iron-substituted BiOCl nanosheetsstarts to reduce due to the lower Coulomb-Coulomb interactionand the increasing depolarization.

1 aSingh, Dinesh1 aJoshi, Bhavana1 aPoddar, Pankaj uhttps://library.ncl.res.in/content/ferroelectric-polarization-and-iron-substitution-synergistically-boost-electrocatalytic01954nas a2200169 4500008004100000022001400041245017500055210006900230260000900299300001400308490000700322520127100329100001801600700001901618700001901637856012801656 2024 eng d a1528-748300aPoly(N-vinylpyrrolidone)-assisted crystal growth of zeolitic imidazolate framework (ZIF-67) and electrochemical properties of its derivatives for flexible supercapacitors0 aPolyNvinylpyrrolidoneassisted crystal growth of zeolitic imidazo cAPR  a3179-31940 v243 a

A simple and explicit wet chemical method enables the room-temperature crystallization of the zeolitic imidazolate framework (ZIF-67) using cotton-cloth (CC) as a substrate; where time-dependent Avrami's kinetic studies demonstrated sluggish nucleation and fast crystal growth resulting in unprecedented morphologies-truncated cubes [synthesized without poly(N-vinylpyrrolidone); PVP], and rhombic dodecahedra (with PVP) with average sizes ranging from 500 nm to 1.41 mu m; wherein amphiphilic PVP plays a crucial function of structure directing agent by modulation of complex formation and deprotonation equilibria. To study the potential of pristine ZIF-67 (ZP0) and PVP-functionalized ZIF-67 (ZP50, ZP100, and ZP200) grown on the CC substrate for application as a flexible electrode in supercapacitors, ZP0, ZP50, ZP100, and ZP200 were annealed to form CZP0, CZP50, and CZP100, respectively. Areal capacitances of 181 and 214 mFcm(-2) were achieved at a current density of 1 mAcm(-2) and a potential window of 1.6 V for CZP0 and CZP100, respectively, and compared to the derivatives without PVP; CZP100 exhibited a superior energy density of 76.3 mu Whcm(-2) and a capacitance retention of 84.3% after 5000 cycles at a current density of 0.5 mAcm(-2).

1 aJain, Manisha1 aJoshi, Bhavana1 aPoddar, Pankaj uhttps://library.ncl.res.in/content/polyn-vinylpyrrolidone-assisted-crystal-growth-zeolitic-imidazolate-framework-zif-67-and