scholarly journals Effect of Proton Diffusion, Electron Conductivity, and Charge‐Transfer Resistance on Nickel Hydroxide Discharge Curves

1994 ◽  
Vol 141 (2) ◽  
pp. 346-351 ◽  
Author(s):  
John W. Weidner ◽  
Paul Timmerman
Keyword(s):  
Charge Transfer ◽  
Nickel Hydroxide ◽  
Charge Transfer Resistance ◽  
Electron Conductivity ◽  
Transfer Resistance ◽  
Proton Diffusion ◽  
Discharge Curves

scholarly journals Enhanced Electrochemical Performance of LiFePO4 Originating from the Synergistic Effect of ZnO and C Co-Modification

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 12
Author(s):  
Xiaohua Chen ◽  
Yong Li ◽  
Juan Wang
Keyword(s):  
Zinc Oxide ◽  
Charge Transfer ◽  
Lithium Ion Batteries ◽  
Electrochemical Impedance ◽  
Lithium Ion ◽  
Charge Transfer Resistance ◽  
Electron Conductivity ◽  
Spherical Particles ◽  
Commercial Application ◽  
Transfer Resistance

Olivine-structure LiFePO4 is considered as promising cathode materials for lithium-ion batteries. However, the material always sustains poor electron conductivity, severely hindering its further commercial application. In this work, zinc oxide and carbon co-modified LiFePO4 nanomaterials (LFP/C-ZnO) were prepared by an inorganic-based hydrothermal route, which vastly boosts its performance. The sample of LFP/C-xZnO (x = 3 wt%) exhibited well-dispersed spherical particles and remarkable cycling stability (initial discharge capacities of 138.7 mAh/g at 0.1 C, maintained 94.8% of the initial capacity after 50 cycles at 0.1 C). In addition, the cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) disclose the reduced charge transfer resistance from 296 to 102 Ω. These suggest that zinc oxide and carbon modification could effectively minimize charge transfer resistance, improve contact area, and buffer the diffusion barrier, including electron conductivity and the electrochemical property. Our study provides a simple and efficient strategy to design and optimize promising olivine-structural cathodes for lithium-ion batteries.

Influence of the interfacial charge-transfer resistance at the counter electrode in dye-sensitized solar cells employing cobalt redox shuttles

2011 ◽  
Vol 4 (12) ◽  
pp. 4921 ◽  
Author(s):  
Hoi Nok Tsao ◽  
Julian Burschka ◽  
Chenyi Yi ◽  
Florian Kessler ◽  
Mohammad K. Nazeeruddin ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Counter Electrode ◽  
Dye Sensitized Solar Cells ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Dye Sensitized ◽  
Redox Shuttles ◽  
Sensitized Solar Cells ◽  
Interfacial Charge

scholarly journals Effect of nanostructured carbon coatings on the electrochemical performance of Li1.4Ni0.5Mn0.5O2+ x -based cathode materials

2016 ◽  
Vol 7 ◽  
pp. 1960-1970 ◽  
Author(s):  
Konstantin A Kurilenko ◽  
Oleg A Shlyakhtin ◽  
Oleg A Brylev ◽  
Dmitry I Petukhov ◽  
Alexey V Garshev
Keyword(s):  
Diffusion Coefficient ◽  
Charge Transfer ◽  
Specific Capacity ◽  
Charge Transfer Resistance ◽  
Poly Vinyl Alcohol ◽  
Nanostructured Carbon ◽  
Transfer Resistance ◽  
Carbon Coatings ◽  
Lithium Diffusion Coefficient ◽  
Electrochemical Cycling

Nanocomposites of Li1.4Ni0.5Mn0.5O2+ x and amorphous carbon were obtained by the pyrolysis of linear and cross-linked poly(vinyl alcohol) (PVA) in presence of Li1.4Ni0.5Mn0.5O2+ x . In the case of linear PVA, the formation of nanostructured carbon coatings on Li1.4Ni0.5Mn0.5O2+ x particles is observed, while for cross-linked PVA islands of mesoporous carbon are located on the boundaries of Li1.4Ni0.5Mn0.5O2+ x particles. The presence of the carbon framework leads to a decrease of the polarization upon cycling and of the charge transfer resistance and to an increase in the apparent Li+ diffusion coefficient from 10−16 cm2·s−1 (pure Li1.4Ni0.5Mn0.5O2+ x ) to 10−13 cm2·s−1. The nanosized carbon coatings also reduce the deep electrochemical degradation of Li1.4Ni0.5Mn0.5O2+ x during electrochemical cycling. The nanocomposite obtained by the pyrolysis of linear PVA demonstrates higher values of the apparent lithium diffusion coefficient, a higher specific capacity and lower values of charge transfer resistance, which can be related to the more uniform carbon coatings and to the significant content of sp2-hybridized carbon detected by XPS and by Raman spectroscopy.

Estimation of continuity of electroactive inorganic films based on apparent anti-Ohmic trend in their charge transfer resistance

2016 ◽  
Vol 219 ◽  
pp. 588-591 ◽  
Author(s):  
Maria A. Komkova ◽  
Elena V. Karpova ◽  
Grigory A. Sukhorukov ◽  
Alexey A. Sadovnikov ◽  
Arkady A. Karyakin
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Inorganic Films

Reduction of Charge-Transfer Resistance via Artificial SEI Formation Using Electropolymerization of Borylated Thiophene Monomer on Graphite Anodes

2018 ◽  
Vol 165 (3) ◽  
pp. A493-A500 ◽  
Author(s):  
Prerna Joshi ◽  
Katsuhito Iwai ◽  
Sai Gourang Patnaik ◽  
Raman Vedarajan ◽  
Noriyoshi Matsumi
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Graphite Anodes

Cobalt oxide enhanced lanthanum strontium cobalt ferrite electrode for solid oxide fuel cells

2021 ◽  
pp. 1-13
Author(s):  
Alberto Olivo ◽  
Berceste Beyribey ◽  
Hwan Kim ◽  
Joshua Persky
Keyword(s):  
Charge Transfer ◽  
Solid Oxide Fuel Cells ◽  
Charge Transfer Resistance ◽  
Solid Oxide ◽  
Co3o4 Nanoparticles ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
Oxide Fuel ◽  
Transfer Resistance ◽  
And Diffusion

A Co3O4 enhanced La0.8Sr0.2Co0.5Fe0.5O3 - δ (LSCF) electrode is developed for use in air electrodes with proton conducting solid oxide fuel cell (SOFC). The incipient wetness impregnation method enables Co3O4 nanoparticles on the LSCF surface without altering the bulk porosity of the LSCF electrode. The polarization resistance of LSCF electrodes is significantly reduced by Co3O4 doping, and both charge transfer and diffusion/conversion resistances were positively affected. The highest reduction in charge transfer resistance is obtained at 700 °C, which is increased from 21%to 32%through reduction of po 2. Conversely, the highest reduction in diffusion/conversion resistance is achieved at 550 °C. By increasing po 2, the reduction is increased from 57%to 66%and its activation energy is reduced up to 33 %compared to pure LSCF. The lowest total area specific resistances obtained under air are 1.45 Ω·cm2, 2.95 Ω·cm2, 6.75 Ω·cm2 and 16.45 Ω·cm2 at 700 °C, 650 °C, 600 °C and 550 °C, respectively.

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