Electrochemical impedance and cyclic voltammetry characterization of a metal hydride electrode in alkaline electrolytes

2006 ◽  
Vol 426 (1-2) ◽  
pp. 93-96 ◽  
Author(s):  
Xiaofeng Li ◽  
Huichao Dong ◽  
Aiqin Zhang ◽  
Yanwei Wei
Keyword(s):  
Cyclic Voltammetry ◽  
Metal Hydride ◽  
Electrochemical Impedance ◽  
Metal Hydride Electrode ◽  
Alkaline Electrolytes

Electrochemical impedance characterization of porous metal hydride electrodes

2004 ◽  
Vol 49 (22-23) ◽  
pp. 3879-3890 ◽  
Author(s):  
Elida B. Castro ◽  
Silvia G. Real ◽  
Alejandro Bonesi ◽  
Arnaldo Visintin ◽  
Walter E. Triaca
Keyword(s):  
Metal Hydride ◽  
Electrochemical Impedance ◽  
Porous Metal ◽  
Metal Hydride Electrodes ◽  
Impedance Characterization

Microstructure and Electrode Characteristics of Ti-V-Cu-Cr-Ni Metal Hydride Electrode Alloy

2012 ◽  
Vol 512-515 ◽  
pp. 1933-1936
Author(s):  
Yu Qing Qiao ◽  
Min Shou Zhao ◽  
Li Min Wang
Keyword(s):  
Metal Hydride ◽  
Electrochemical Impedance ◽  
Secondary Phase ◽  
Charge Transfer Resistance ◽  
Solid Solution Phase ◽  
Transfer Resistance ◽  
Metal Hydride Electrode ◽  
Eis Measurements ◽  
Increasing Temperature ◽  
Electrode Characteristics

Microstructure and electrode characteristics of Ti-V-Cu-Cr-Ni metal hydride electrode alloy have been investigated by XRD, FESEM-EDS and EIS measurements. The result shows that the alloy is mainly composed of V-based solid solution phase with body-centered-cubic structure and TiNi-based secondary phase. The discharge capacity increases with increasing temperature in a wider temperature region from 303 K to 343 K. The result of electrochemical impedance spectrometry indicates that the charge transfer resistance decreases with increasing temperature, while the exchange current density in the bulk of the alloy increase with increasing temperature.

scholarly journals Microwave-Assisted Synthesis and Characterization of γ-MnO2 for High-Performance Supercapacitors

2021 ◽  
Author(s):  
Lorena Cuéllar-Herrera ◽  
Elsa Arce-Estrada ◽  
Antonio Romero-Serrano ◽  
José Ortiz-Landeros ◽  
Román Cabrera-Sierra ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
High Performance ◽  
Pore Diameter ◽  
Electrochemical Impedance ◽  
High Specific Capacitance ◽  
Microwave Assisted Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
20 Nm

AbstractTwo hydrothermal techniques under microwave irradiation were used to synthesize γ-MnO2 from 90°C to 150°C in 10−30 min. The first technique is based on reducing KMnO4 with MnSO4, and the second one involves liquid-phase oxidation between MnSO4 and (NH4)2S2O8. The structures and morphologies of the samples were analyzed using X-ray diffraction, scanning electron microscopy, and N2 physisorption measurements. The electrochemical properties were evaluated through cyclic voltammetry and electrochemical impedance spectroscopy. The γ-MnO2 materials obtained by the first technique mainly exhibited nanorods with diameters of 40–60 nm, and the samples obtained by the second technique showed flower-like microspheres with diameters of 1−2 µm; each flower was composed of nanosheets with a thickness of 10−20 nm. The processing time directly depends on the size of the nanorods. The sample synthesized by the first technique at 150°C and 10 min has the highest specific surface area of up to 59.08 m2 g−1 and mean pore diameter of 34.11 nm. Furthermore, this sample exhibits a near-rectangular cyclic voltammetry curves and high specific capacitance of 331.3 F g−1 in 0.1 M Na2SO4 solution at 5 mV s−1 scan rate. Graphic abstract

Hybrid Supercapacitors Based on Polyaniline and Carbon Aerogels Composite Electrode Materials

2011 ◽  
Vol 391-392 ◽  
pp. 18-22
Author(s):  
Zheng Jin ◽  
Dong Yu Zhao ◽  
Bo Hong Li ◽  
Xiao Min Ren ◽  
Shan Tao Yan ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Specific Capacitance ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Carbon Aerogels ◽  
Composite Electrodes ◽  
Long Cycle Life ◽  
Hybrid Supercapacitors

The purpose of this paper is to develop feasible composite electrodes with a long cycle life and large specific capacitance and to investigate optimal ratio between aniline and carbon aerogels (CA) materials. The characterization of the composite electrode materials was studied by using scanning electron microscopy (SEM), electrochemical impedance spectroscopy, cyclic voltammetry (CV) and the constant charge-discharge. The specific capacitance of the composite electrode materials, measured using cyclic voltammetry at scan rate of 1mV•s-1, was found to be 1139.66F•g-1. For a simple supercapcitor, the highest specific capacitance (127.53 F•g-1 at 30mA) is obtained at ratio between aniline and CA is 1:4.

Characterization of metal hydride electrodes by means of electrochemical impedance spectroscopy

1993 ◽  
Vol 192 (1-2) ◽  
pp. 161-163 ◽  
Author(s):  
Nobuhiro Kuriyama ◽  
Tetsuo Sakai ◽  
Hiroshi Miyamura ◽  
Itsuki Uehara ◽  
Hiroshi Ishikawa
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Metal Hydride ◽  
Electrochemical Impedance ◽  
Metal Hydride Electrodes

Microstructure and some Dynamic Performances of Ti-V-Pd-Cr-Ni Metal Hydride Electrode Alloy

2012 ◽  
Vol 512-515 ◽  
pp. 1937-1940
Author(s):  
Xian Wen Zeng ◽  
Yu Qing Qiao ◽  
Min Shou Zhao
Keyword(s):  
Temperature Region ◽  
Metal Hydride ◽  
Electrochemical Impedance ◽  
Secondary Phase ◽  
Dynamic Parameters ◽  
Metal Hydride Electrode ◽  
Dynamic Performances ◽  
Eis Measurements ◽  
Increasing Temperature ◽  
Bcc Phase

Microstructure and Some Dynamic Parameters of Ti-V-Pd-Cr-Ni metal hydride electrode alloy have been investigated by XRD, FESEM and EIS measurements. The result shows that the alloy is mainly composed of bcc phase and TiNi-based secondary phase. The discharge capacity increases with increasing temperature in a wider temperature region from 303 K to 343 K. The result of electrochemical impedance spectrometry indicates that RT decreases with increasing temperature, which is 2.392Ω, 0.531Ω and 0.156Ω at 303K, 323K and 343K, respectively. However, I0 increases with increasing temperature, which is 72.76 mA g-1, 327.75 mA g-1 and 1262.88 mA g-1 at 303K, 323K and 343K, respectively.

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