Predictive Characterization of SEI Formed on Graphite Negative Electrodes for Efficiently Designing Effective Electrolyte Solutions

ABSTRACTAlloy 22 (N06022) is the candidate material for the corrosion resistant, outer barrier of the nuclear waste container. Two of the potential corrosion degradation modes of the container are uniform corrosion and localized corrosion. A testing program is under way at the Lawrence Livermore National Laboratory to determine the susceptibility of Alloy 22 to these two forms of corrosion using immersion tests. Metallic coupons are being exposed to several electrolyte solutions simulating concentrated underground water from pH 3 to 10 at 60°C and 90°C. This paper describes the results obtained after more than a five-year exposure of 122 specimens to the testing electrolyte solutions. Results show little general corrosion and the absence of localized corrosion. The maximum general corrosion rate was 23 nm/yr.

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Hydrogenation and Discharge Capacity of a La0.7Mg0.3Al0.3Mn0.4Co0.5Ni3.8 Alloy for Nickel-Metal Hydride Batteries

Materials Science Forum ◽

10.4028/www.scientific.net/msf.660-661.128 ◽

2010 ◽

Vol 660-661 ◽

pp. 128-132

Author(s):

Julio César Serafim Casini ◽

Lia Maria Carlotti Zarpelon ◽

Eliner Affonso Ferreira ◽

Hidetoshi Takiishi ◽

Rubens Nunes de Faria Jr.

Keyword(s):

Discharge Capacity ◽

Metal Hydride ◽

High Pressures ◽

Negative Electrode ◽

X Ray Diffraction ◽

Nickel Metal ◽

Nickel Metal Hydride ◽

Negative Electrodes ◽

The Mean

The preparation of negative electrodes for nickel-metal hydride (Ni-MH) batteries using a La0.7Mg0.3Al0.3Mn0.4Co0.5Ni3.8 alloy in the as-cast state has been carried out. The alloy was mechanically crushed (<44 m) and a battery was manufactured with this material. The mean discharge capacity achieved using this method was 384 mAh/g. Another two batteries were prepared using a hydrogen powdered La0.7Mg0.3Al0.3Mn0.4Co0.5Ni3.8 alloy at low and high pressures (2-10 bar). It has been shown that hydrogen powdering facilitates the activation of the negative electrode for Ni-MH batteries. This study also included the characterization of the hydrogenated and crushed powders. These materials were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD).

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Surface characterization of polymer foils

e-Polymers ◽

10.1515/epoly.2012.12.1.960 ◽

2012 ◽

Vol 12 (1) ◽

Cited By ~ 14

Author(s):

Zdenka Kolská ◽

Alena Řezníčková ◽

Václav Švorčík

Keyword(s):

Zeta Potential ◽

Surface Characterization ◽

Streaming Potential ◽

Electrolyte Solutions ◽

Force Microscopy ◽

Angle Measurements ◽

Atomic Force ◽

Contact Angle Measurements ◽

Polymer Foils

AbstractElectrokinetic potential (zeta potential) for selected 21 polymer foils was studied. The results on zeta potential are supplemented with contact angle measurements (goniometry) and with the results on surface roughness measured by atomic force microscopy (AFM). Zeta potential was determined using two approaches: streaming current and streaming potential at pH=6.0-6.2. Two electrolyte solutions with KCl (concentrations 0.001 and 0.005 mol/dm3) and KNO3 (0.001 mol/dm3) were used in the experiments. Zeta potential was shown to depend on surface chemistry, polarity, roughness and morphology of the polymer foils.

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Electrochemical Characterization of Cellulose Acetate Butyrate-Prmutit Composite Membrane in Aqueous Uni-Uni Valent Electrolyte Solutions

International Journal of Applied Sciences and Biotechnology ◽

10.3126/ijasbt.v3i2.12748 ◽

2015 ◽

Vol 3 (2) ◽

pp. 337-341

Author(s):

A.K. Tiwari ◽

R. Sonkar ◽

P.K. Tiwari

Keyword(s):

Membrane Potential ◽

Cellulose Acetate ◽

Electrolyte Solutions ◽

Cellulose Acetate Butyrate ◽

Water Flooding ◽

Time Data ◽

Fixed Charge Density ◽

Electrochemical Parameters ◽

Acetate Butyrate

Co-mixed cellulose acetate butyrate and permutit in a definite composition was prepared and coded as MRS-2. The membrane potential was measured with uni-uni valent electrolyte, NaCl solutions using saturated calomel electrodes (SCEs).The effective fixed charge density of the membrane was determined by TMS method and it showed dependence on the porosity, charge on the membrane matrix, charge and size of permeating ions. Other important electrochemical parameters were calculated. Conductance-time data were generated for the kinetic study of the permeating ions in terms of membrane permeability, flow and flux parameters. Donnan membrane equilibrium condition was examined. Membrane adsorbability showed concave dependence with external electrolyte solution and convex type dependence was showed by swelling and conductance parameters. This membrane had no characteristic of anomalous osmosis, indicates that there is no water flooding will take place during membrane operation.Int J Appl Sci Biotechnol, Vol 3(2): 337-341 DOI: http://dx.doi.org/10.3126/ijasbt.v3i2.12748

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