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 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.

scholarly journals Optimum dose of Chaetoceros for controlling methanogenesis to improve power production of microbial fuel cell

2021 ◽  
Author(s):  
P. P. Rajesh ◽  
P. Christine ◽  
M. M. Ghangrekar
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Marine Algae ◽  
Coulombic Efficiency ◽  
Charge Transfer Resistance ◽  
Optimum Dose ◽  
Anaerobic Sludge ◽  
Power Performance ◽  
Transfer Resistance ◽  
Lower Charge

Abstract The marine algae Chaetoceros contains hexadecatrienoic acid, which suppresses methanogen development and improves the coulombic efficiency (CE) of microbial fuel cell (MFC). To inhibit the methanogens, optimum concentration of marine algae should be added to the anaerobic sludge to enhance the performance of microbial fuel cell. A varying concentration of Chaetoceros ranging from 1 to 20 mg/mL was carried out for pretreatment of anaerobic mix-consortium to suppress methanogens. MFC inoculated with pretreated anaerobic sludge with 10 mg/mL Chaetoceros showed a maximum power density of 21.62 W/m3 and a maximum CE of 37.25%, which was considerably higher than the treatment with other concentrations. At 10 mg/mL concentration, Tafel analysis of anode in MFC showed a higher exchange current density of 66.35 mA/m2 and a lower charge transfer resistance of 0.97 Ω.m2, revealing higher bio-electrochemical activity. The performance of MFC improved when the concentration of Chaetoceros was increased up to 10 mg/mL, but then began to decline as the concentration increased further. Thus, the optimum dose of Chaetoceros to be added in the mix-anaerobic consortiumto optimize the power performance of MFC is determined, which can be carried out in scaled-up MFCs.

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.

Preparation and Electrochemical Properties of Flow-Through TiO2 Nanoarray

2020 ◽  
Vol 65 ◽  
pp. 1-12 ◽  
Author(s):  
Yi Bing Xie
Keyword(s):  
Electrochemical Properties ◽  
Pore Diameter ◽  
Charge Transfer Resistance ◽  
Current Response ◽  
Transfer Resistance ◽  
Warburg Impedance ◽  
Wall Distance ◽  
Anodization Process ◽  
Flow Through ◽  
And Diffusion

Microstructure-tailored TiO2 nanoarrays with adjustive wall-hole morphology have been designed to improve electrochemical properties. Tubular, porous and flow-through TiO2 nanoarrays are fabricated by one-stepped, two-stepped and three-stepped anodization process under the controlled reaction condition. Tubular nanoarray with the opened-mouth and closed-bottom has a tube diameter of 120-130nm, a length of 8.12μm, and wall thickness of 15nm. Similarly, porous TiO2 nanoarray with the opened-mouth and closed-bottom has a pore diameter of 60-70nm, a length of 8.25μm, neighboring wall distance of 70-80nm. Comparatively, flow-through TiO2 nanoarray with the opened-mouth and opened-bottom has a pore diameter of 110-120nm, a length of 8.56μm, neighboring wall distance of 40nm. In comparison with tubular and porous TiO2 nanoarrays, flow-through TiO2 nanoarray indicates the deceased charge transfer resistance and diffusion-related Warburg impedance, presenting the enhanced current response at the same electrode potential. Accordingly, bottom-opened flow-through TiO2 nanoarray achieves the specific capacitance of 6.35 mF cm-2, which is higher than the bottom-closed tubular and porous TiO2 nanoarrays (2.94 and 3.78 mF cm-2). The flow-through TiO2 nanoarray presents the improved electrochemical performance for the electrochemical energy-storage.

Electrochemical Properties of Electrodeposited MnO2 Nanoparticles

2015 ◽  
Vol 1113 ◽  
pp. 550-553 ◽  
Author(s):  
Gomaa Abdelgawad Mohammed Ali ◽  
Mashitah M. Yusoff ◽  
Kwok Feng Chong
Keyword(s):  
Electrochemical Properties ◽  
High Specific Capacitance ◽  
Xrd Analysis ◽  
Charge Transfer Resistance ◽  
Electrochemical Studies ◽  
Galvanostatic Charge ◽  
Transfer Resistance ◽  
Electrodeposited Film ◽  
Solution Resistance ◽  
Charge Discharge

The present study shows the electrodeposition of MnO2 from KMnO2 solution and its electrochemical studies. XRD analysis shows the electrodeposited MnO2 has nano-sized particle of 18 nm. The electrochemical properties have been investigated using the cyclic voltammetry, galvanostatic charge/discharge and impedance techniques. The electrodeposited MnO2 shows good electrochemical behavior with high specific capacitance value of ca. 306 F g-1. Moreover, it shows high capacitance stability of 90% over 1000 charge/discharge cycles. Impedance result shows low solution resistance and charge transfer resistance, an indication of the conductive nature for the electrodeposited film.

Electrochemical Properties of P-Doped Silicon Thin Film Anodes of Lithium Ion Batteries

2013 ◽  
Vol 737 ◽  
pp. 80-84 ◽  
Author(s):  
Arenst Andreas Arie ◽  
Joong Kee Lee
Keyword(s):  
Electrical Conductivity ◽  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Specific Capacity ◽  
High Capacity ◽  
Lithium Ion ◽  
Charge Transfer Resistance ◽  
Commercial Application ◽  
Silicon Thin Film ◽  
Transfer Resistance

Silicon would seem to be a possible candidate to replace graphite or carbon as anode materials for lithium ion batteries based on its potential high capacity of 4200 mAhg-1. The main problem that must be solved for commercial application of silicon as anode material was the poor cyclic performance due to severe volume expansion during repeated charged-discharged cycles and its low electrical conductivity. In this work, we proposed Phosphorus doped (P-doped) Si films as anodes in lithium ion batteries. The electrochemical properties of the silicon based electrodes were examined by means of charge-discharge and impedance test. In comparison with the bare silicon electrode, the P type silicon electrode exhibited higher specific capacity of 2585 mAhg-1 until the 50th cycle. It was attributed to the improved electrical conductivity of Si film and reduced charge transfer resistance

The influence of copper addition on the electrical conductivity and charge transfer resistance of reduced graphene oxide (rGO)

2018 ◽  
Vol 42 (19) ◽  
pp. 16362-16371 ◽  
Author(s):  
Ferry Iskandar ◽  
Oktaviardi Bityasmawan Abdillah ◽  
Erythrina Stavila ◽  
Akfiny Hasdi Aimon
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Charge Transfer ◽  
Electrochemical Properties ◽  
Reduced Graphene Oxide ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Copper Addition ◽  
Reduced Graphene

The possible explanations on how the existence of copper, CuO, or Cu2O influences the electrical conductivity and electrochemical properties of rGO.

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.

scholarly journals An Amazingly Simple, Fast and Green Synthesis Route to Polyaniline Nanofibers for Efficient Energy Storage

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2212
Author(s):  
Sami ur Rahman ◽  
Philipp Röse ◽  
Anwar ul Haq Ali Shah ◽  
Ulrike Krewer ◽  
Salma Bilal
Keyword(s):  
Coulombic Efficiency ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
Charge Transfer Resistance ◽  
Toxic Chemicals ◽  
Transfer Resistance ◽  
Synthesis Time ◽  
Supercapacitor Performance ◽  
Solution Resistance ◽  
Charge Discharge

The major drawbacks of the conventional methods for preparing polyaniline (PANI) are the large consumptions of toxic chemicals and long process durations. This paper presents a remarkably simple and green route for the chemical oxidative synthesis of PANI nanofibers, utilizing sodium phytate as a novel and environmentally friendly plant derived dopant. The process shows a remarkable reduction in the synthesis time and usage of toxic chemicals with good dispersibility and exceedingly high conductivity up to 10 S cm−1 of the resulting PANI at the same time. A detailed characterization of the PANI samples has been made showing excellent relationships between their structure and properties. Particularly, the electrochemical properties of the synthesized PANI as electrode material for supercapacitors were analyzed. The PANI sample, synthesized at pre-optimized conditions, exhibited impressive supercapacitor performance having a high specific capacitance (Csp) (832.5 Fg−1 and 528 Fg−1 at 1 Ag−1 and 40 Ag−1, respectively) as calculated from galvanostatic charge/discharge (GCD) curves. A good rate capability with a capacitance retention of 67.6% of its initial value was observed. The quite low solution resistance (Rs) value of 281.0 × 10−3 Ohm and charge transfer resistance value (Rct) of 7.44 Ohm represents the excellence of the material. Further, a retention of 95.3% in coulombic efficiency after 1000 charge discharge cycles, without showing any significant degradation of the material, was also exhibited.

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