scholarly journals Bio-Based Plasticized PVA Based Polymer Blend Electrolytes for Energy Storage EDLC Devices: Ion Transport Parameters and Electrochemical Properties

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1994
Author(s):  
Shujahadeen B. Aziz ◽  
Muaffaq M. Nofal ◽  
M. F. Z. Kadir ◽  
Elham M. A. Dannoun ◽  
Mohamad A. Brza ◽  
...  
Keyword(s):  
Energy Storage ◽  
Dielectric Properties ◽  
Electrochemical Properties ◽  
Power Density ◽  
Charge Transfer Resistance ◽  
Transference Numbers ◽  
Storage Device ◽  
Equivalent Series Resistance ◽  
Transport Parameters ◽  
Transfer Resistance

This report shows a simple solution cast methodology to prepare plasticized polyvinyl alcohol (PVA)/methylcellulose (MC)-ammonium iodide (NH4I) electrolyte at room temperature. The maximum conducting membrane has a conductivity of 3.21 × 10−3 S/cm. It is shown that the number density, mobility and diffusion coefficient of ions are enhanced by increasing the glycerol. A number of electric and electrochemical properties of the electrolyte—impedance, dielectric properties, transference numbers, potential window, energy density, specific capacitance (Cs) and power density—were determined. From the determined electric and electrochemical properties, it is shown that PVA: MC-NH4I proton conducting polymer electrolyte (PE) is adequate for utilization in energy storage device (ESD). The decrease of charge transfer resistance with increasing plasticizer was observed from Bode plot. The analysis of dielectric properties has indicated that the plasticizer is a novel approach to increase the number of charge carriers. The electron and ion transference numbers were found. From the linear sweep voltammetry (LSV) response, the breakdown voltage of the electrolyte is determined. From Galvanostatic charge-discharge (GCD) measurement, the calculated Cs values are found to drop with increasing the number of cycles. The increment of internal resistance is shown by equivalent series resistance (ESR) plot. The energy and power density were studied over 250 cycles that results to the value of 5.38–3.59 Wh/kg and 757.58–347.22 W/kg, respectively.

Synthesis and Electrochemical Properties of Polypyrrole Conducting Polymer in Sheath like Nanotube Arrays Structured over TiO2 for Supercapacitor Energy Storage Devices

2015 ◽  
Vol 1749 ◽  
Author(s):  
Navjot K. Sidhu ◽  
A.C. Rastogi
Keyword(s):  
Energy Storage ◽  
Electrochemical Properties ◽  
Electrochemical Impedance ◽  
Charge Transfer Resistance ◽  
Nanotube Arrays ◽  
Energy Storage Devices ◽  
Transfer Resistance ◽  
Capacitance Density ◽  
Electrically Conducting ◽  
Supercapacitor Energy Storage

ABSTRACTThe vertical TiO2 nanotube arrays constituting the core of 3-D nanoscale electrode architecture were synthesized over Ti sheet by anodization. Such formed TiO2 nanotubes are electrically conducting and amorphous as confirmed by XRD studies. Nanotube morphology is affected by water content and in the present study, close-packed 3-4 μm long TiO2 nanotube arrays of 45-50 nm diameter are formed with 2% water as revealed by the transmission and scanning electron microscopy. The redox active polypyrrole sheath is created by ultra-short pulsed current electropolymerization. Electrochemical properties of the 3-D nanoscaled TiO2 nanotube core-polypyrrole sheath electrodes relevant to the energy storage were investigated using cyclic voltammetry (CV) plots, electrochemical impedance spectroscopy (EIS), Charge discharge (CD) tests. High areal capacitance density of 48 mF cm-2 and low charge transfer resistance 12 Ω cm-2 with least ion diffusion limitation are realized at optimized polypyrrole sheath thickness. The Raman spectra studies reveal anion at specific chain locations involve in the redox process.

Constructed Ag NW@Bi/Al core–shell nano-architectures for high-performance flexible and transparent energy storage device

Nanoscale ◽  
2020 ◽  
Vol 12 (37) ◽  
pp. 19308-19316
Author(s):  
Xin He ◽  
Junyan Liu ◽  
Sirou Zhao ◽  
Yu Zhong ◽  
Bohua Chen ◽  
...  
Keyword(s):  
Energy Storage ◽  
Power Density ◽  
High Performance ◽  
Negative Electrode ◽  
Electrochemical Stability ◽  
Storage Device ◽  
Core Shell ◽  
Energy Storage Device ◽  
High Transparency ◽  
Hierarchical Nanostructure

We developed an Ag NW@Bi/Al 1D hierarchical nanostructure as a negative electrode for flexible and transparent energy storage device (FTESD), which endows high transparency, improved energy/power density and electrochemical stability.

scholarly journals Electrochemical Characterization of CVD-Grown Graphene for Designing Electrode/Biomolecule Interfaces

Crystals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 241
Author(s):  
Keishu Miki ◽  
Takeshi Watanabe ◽  
Shinji Koh
Keyword(s):  
Electrochemical Properties ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Chemical Vapor ◽  
Charge Transfer Resistance ◽  
Monolayer Graphene ◽  
Transfer Resistance ◽  
Graphene Electrode ◽  
Before And After ◽  
Modified Graphene

In research on enzyme-based biofuel cells, covalent or noncovalent molecular modifications of carbon-based electrode materials are generally used as a method for immobilizing enzymes and/or mediators. However, the influence of these molecular modifications on the electrochemical properties of electrode materials has not been clarified. In this study, we present the electrochemical properties of chemical vapor deposition (CVD)-grown monolayer graphene electrodes before and after molecular modification. The electrochemical properties of graphene electrodes were evaluated by cyclic voltammetry and electrochemical impedance measurements. A covalently modified graphene electrode showed an approximately 25-fold higher charge transfer resistance than before modification. In comparison, the electrochemical properties of a noncovalently modified graphene electrode were not degraded by the modification.

A novel cord-shaped supercapacitor with high stretchability

2019 ◽  
Vol 89 (19-20) ◽  
pp. 4265-4271
Author(s):  
Wenqi Nie ◽  
Shu Zhang ◽  
Xin Ding ◽  
Jiyong Hu ◽  
Xudong Yang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Power Density ◽  
Three Dimensional ◽  
Storage Device ◽  
High Porosity ◽  
Energy Storage Device ◽  
High Capacitance ◽  
Capacitive Performance ◽  
Integration Technology

Cord-shaped stretchable supercapacitors have received much attention due to their high stretchability and three-dimensional flexibility. For coaxial supercapacitors, lower capacitive performance and the inextensibility of the separation layer have been the important factors hindering further developments. In this work, we developed an integration technology to fabricate multiple yarn-electrodes by a layer-to-layer braiding. Between the inner and outer electrodes there is a braided elastic separator by braiding multiple spandex yarns. The braided separator features not only a reliable separation of the inner and outer electrodes, but also a high stretchability and high porosity. The cord-shaped supercapacitor shows an excellent capacitive performance of 60.1 mF/cm2 with energy density of 5.4 μWh/cm2, power density of 0.52 mW/cm2 and extremely high capacitance retention of 99.8% under the strain of 100%, demonstrating the application value of this stretchable energy storage device.

Emerging NiCo2O4 Electrode Materials Assembled by Nanosheets for High Performance Hybrid Capacitor with High Specific Capacitance

2020 ◽  
Vol 15 (4) ◽  
pp. 498-503
Author(s):  
Jian Wang ◽  
Yan Zhao ◽  
Dong Zhang ◽  
Yucai Li ◽  
Shiwei Song ◽  
...  
Keyword(s):  
Energy Storage ◽  
Specific Capacitance ◽  
Power Density ◽  
Rational Design ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Storage Device ◽  
Energy Storage Devices

Rational design and construction of hybrid capacitor electrode materials with prominent energy and power density plays an indispensable role for its potential application in energy storage devices. In this work, the nanoflower-like NiCo2O4 samples are successfully prepared on Ni foam via a facile hydrothermal method. The as-fabricated NiCo2O4 samples exhibit superior electrochemical performance with a high specific capacitance of 444.4 F g–1 at 1 A g–1 and excellent capacitance retention. In addition, the as-fabricated device presents a high energy density of 0.298 mWh cm–3 at a power density of 5.71 mW cm–3 and excellent cycle stability with the capacitance retention of 75.6% after 10000 cycles, indicating a promising application as electrodes for energy storage device.

scholarly journals Structural refinement and electrochemical properties of one dimensional (ZnO NRs)1−x(CNs)x functional hybrids for serotonin sensing studies

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Sajid B. Mullani ◽  
Ananta G. Dhodamani ◽  
Annadanesh Shellikeri ◽  
Navaj B. Mullani ◽  
Anita K. Tawade ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Electrochemical Properties ◽  
Surface Area ◽  
Limit Of Detection ◽  
Zno Nanorods ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Bet Analysis ◽  
Lower Charge ◽  
Lower Charge Transfer Resistance

Abstract Herein, the efficient serotonin (5-HT) sensing studies have been conducted using the (ZnO NRs)1−x(CNs)x nanocomposites (NCs) having appropriate structural and electrochemical properties. Initially, the different compositions of ZnO nanorods (NRs), with varying content of carbon nanostructures (CNs=MWCNTs and RGO), are prepared using simple in-situ wet chemical method and thereafter these NCs have been characterized for physico-chemical properties in correlation to the 5-HT sensing activity. XRD Rietveld refinement studies reveal the hexagonal Wurtzite ZnO NRs oriented in (101) direction with space group ‘P63mc’ and both orientation as well as phase of ZnO NRs are also retained in the NCs due to the small content of CNs. The interconnectivity between the ZnO NRs with CNs through different functional moieties is also studied using FTIR analysis; while phases of the constituents are confirmed through Raman analysis. FESEM images of the bare/NCs show hexagonal shaped rods with higher aspect ratio (4.87) to that of others. BET analysis and EIS measurements reveal the higher surface area (97.895 m2/g), lower charge transfer resistance (16.2 kΩ) for the ZCNT 0.1 NCs to that of other NCs or bare material. Thereafter, the prepared NCs are deposited on the screen printed carbon electrode (SPCE) using chitosan as cross-linked agent for 5-HT sensing studies; conducted through cyclic voltammetry (CV) and square wave voltammetry (SWV) measurements. Among the various composites, ZCNT0.1 NCs based electrodes exhibit higher sensing activity towards 5-HT in accordance to its higher surface area, lower particle size and lower charge transfer resistance. SWV measurements provide a wide linear response range (7.5–300 μM); lower limit of detection (0.66 μM), excellent limit of quantification (2.19 μM) and good reproducibility to ZCNT 0.1 NCs as compared to others for 5-HT sensing studies.

Electrochemical Properties of NbO as a Negative Electrode Material for Lithium Secondary Batteries

2016 ◽  
Vol 835 ◽  
pp. 126-130 ◽  
Author(s):  
Kyoung Soo Park ◽  
Soon Ki Jeong ◽  
Yang Soo Kim
Keyword(s):  
Electrochemical Properties ◽  
Ball Milling ◽  
Electrode Material ◽  
Negative Electrode ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Lithium Secondary Batteries ◽  
Negative Electrode Material

The electrochemical properties of niobium monoxide, NbO, were investigated as a negative electrode material for lithium-ion batteries. Lithium ions were inserted into and extracted from NbO material at potentials < 1.0 V versus Li/Li+, involving formation of a solid electrolyte interface (SEI) on the NbO surface in the first cycle. Its reversible capacity is ~67 mAh g–1 with the capacity retention of ~109% after 50 cycles. The magnitude of charge transfer resistance was greatly decreased by ball-milling the pristine NbO, whereas the ball-milling had no effect on the SEI resistance.

Electrochemical Properties of Silicon-Polyacrylonitrile (PAN) Composite Anodes for Flexible Batteries

2020 ◽  
Vol 20 (11) ◽  
pp. 7039-7044
Author(s):  
Sang-Hui Park ◽  
Han-Gyeol Lee ◽  
Jin-Hoon Ju ◽  
Sang-Hee Park ◽  
Gyu-Bong Cho ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Carbon Fibers ◽  
Coulombic Efficiency ◽  
Charge Transfer Resistance ◽  
Carbonization Temperature ◽  
Composite Fibers ◽  
Transfer Resistance ◽  
C Fibers ◽  
Composite Anodes ◽  
Pan Fibers

Polyacrylonitrile (PAN)/Si composite fibers (electrodes) with flexibility were fabricated using an elec-trospinning method and then Si-embedded carbon (Si/C) fibers were prepared by carbonizing the composite fibers at 800, 900, and 1000°C. Si particles were distributed in the interior and exterior of entangled PAN fibers. After carbonization, the structure of electrodes was preserved but the diameter of fibers was decreased owing to the release of component elements constituting PAN such as nitrogen and oxygen. Crystalline Si particles existed in carbon fibers with both amorphous and crystalline phases. As carbonization temperature increased, the carbon content and the crys-tallinity of carbon increased. The electrode carbonized at 1000°C with the lowest charge transfer resistance exhibited the best electrochemical properties in terms of capacity, coulombic efficiency and cycle life.

scholarly journals Porous Mixed Ionic Electronic Conductor Interlayers for Solid-State Batteries

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
So Yeon Kim ◽  
Ju Li
Keyword(s):  
Solid State ◽  
Solid Electrolytes ◽  
Alkali Metals ◽  
Fire Hazard ◽  
Charge Transfer Resistance ◽  
Storage Device ◽  
Transfer Resistance ◽  
Future Design ◽  
Mixed Ionic Electronic Conductor ◽  
Solid State Batteries

Rechargeable solid-state batteries (SSBs) have emerged as the next-generation energy storage device based on lowered fire hazard and the potential of realizing advanced battery chemistries, such as alkali metal anodes. However, ceramic solid electrolytes (SEs) generally have limited capability in relieving mechanical stress and are not chemically stable against body-centered cubic alkali metals or their alloys with minor solute elements (β-phase). Swelling-then-retreating of β-phase often causes instabilities such as SE fracture and corrosion as well as the loss of electronic/ionic contact, which leads to high charge-transfer resistance, short-circuiting, etc. These challenges have called for the cooperation from other classes of materials and novel nanocomposite architectures in relieving stress and preserving essential contacts while minimizing detrimental disruptions. In this review, we summarize recent progress in addressing these issues by incorporating other classes of materials such as mixed ion-electron conductor (MIEC) porous interlayers and ion-electron insulator (IEI) binders, in addition to SE and metals (e.g., β-phase and current collectors) that are the traditional SSB components. In particular, we focus on providing theoretical interpretations on how open nanoporous MIEC interlayers manipulate β-phase deposition and stripping behavior and thereby suppress such instabilities, referring to the fundamental thermodynamics and kinetics governing the nucleation and growth of the β-phase. The review concludes by describing avenues for the future design of porous MIEC interlayers for SSBs.

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