Analysis of the Influence of the Cathodic Polarization Value on the Amount of Hydrogen Sorption of Al-Sm with the Alloy of Electrochemical Measurements

The effect of cathodic polarization on the rate of hydrogen sorption from an aqueous organic electrolyte on an Al-Sm alloy using the potentiostatic and potentiodynamic methods were studied. The obtained data allowed us to calculate the diffusion-kinetic characteristics of this process, such as the interstitial constant, diffusion constant CН √ D, constant current iconst, diffusion coefficient D and adsorption of hydrogen atoms G. The number of nuclei decreases, but their mass and radius increase in the potential range from –2.0 V to –2.4 V. The adsorption of hydrogen on the surface increases; which confirms that predominance of the discharge of hydrogen atoms occurs at more negative potentials according to the recombination mechanism.

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An Automatic Polarization Apparatus for Electrochemical Corrosion Studies

CORROSION ◽

10.5006/0010-9312-25.12.515 ◽

1969 ◽

Vol 25 (12) ◽

pp. 515-519 ◽

Cited By ~ 9

Author(s):

W. D. HENRY ◽

B. E. WILDE

Keyword(s):

Cathodic Polarization ◽

Reference Electrode ◽

Electrochemical Corrosion ◽

304 Stainless Steel ◽

Constant Current ◽

Voltage Source ◽

Potential Range ◽

Alloy Development ◽

Corrosion Studies ◽

Potentiodynamic Anodic Polarization

Abstract Statistical alloy development programs in which electrochemical screening techniques are used require facilities to produce precision polarization data. Conventional equipment and techniques presently available for such programs are not entirely satisfactory. Therefore, modifications were made to readily available commercial equipment to significantly improve the attainable sensitivity and reproducibility. This paper describes in detail the procedures necessary to produce an apparatus that automatically measures and records anodic and cathodic polarization curves over an applied potential range of ±2.0 volts. Traverse rates between 2 × 10−3 and 3 × 104 volts per hour are attainable and can be used to polarize electrodes through zero volts (with respect to reference electrode) without the necessity of manual switching. A special mode switch is described in detail with which the basic electronic potentiostat can be used as a constant current or constant voltage source by manual selection. The results obtained from three typical polarization experiments: (1) potentiodynamic anodic polarization, (2) galvanodynamic cathodic polarization, and (3) galvanodynamic linear polarization of AISI Type 304 stainless steel in hydrogen saturated 1N H2SO4 at 25 C (77 F), showed the performance of the apparatus to be equal to or superior to that of conventional manual procedures.

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Ni doping modulated adsorption of hydrogen atoms on CoSe2 electrocatalyst for excellent acid hydrogen evolution by water splitting

Ionics ◽

10.1007/s11581-021-04392-4 ◽

2022 ◽

Author(s):

Long Zhang ◽

Zhao Li ◽

Yuanyuan Lu ◽

Sen Yang ◽

Haihong Zhang ◽

...

Keyword(s):

Hydrogen Evolution ◽

Water Splitting ◽

Hydrogen Atoms ◽

Ni Doping ◽

Adsorption Of Hydrogen

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Hydrogen Embrittlement Behavior of 18Ni 300 Maraging Steel Produced by Selective Laser Melting

Materials ◽

10.3390/ma12152360 ◽

2019 ◽

Vol 12 (15) ◽

pp. 2360 ◽

Cited By ~ 2

Author(s):

Young Jin Kwon ◽

Riccardo Casati ◽

Mauro Coduri ◽

Maurizio Vedani ◽

Chong Soo Lee

Keyword(s):

Hydrogen Embrittlement ◽

Maraging Steel ◽

Selective Laser Melting ◽

Solution Treatment ◽

Tensile Tests ◽

Constant Current ◽

Hydrogen Atoms ◽

Laser Melting ◽

Constant Current Density ◽

Hydrogen Charging

A study was performed to investigate the hydrogen embrittlement behavior of 18-Ni 300 maraging steel produced by selective laser melting and subjected to different heat treatment strategies. Hydrogen was pre-charged into the tensile samples by an electro-chemical method at the constant current density of 1 A m−2 and 50 A m−2 for 48 h at room temperature. Charged and uncharged specimens were subjected to tensile tests and the hydrogen concentration was eventually analysed using quadrupole mass spectroscopy. After tensile tests, uncharged maraging samples showed fracture surfaces with dimples. Conversely, in H-charged alloys, quasi-cleavage mode fractures occurred. A lower concentration of trapped hydrogen atoms and higher elongation at fracture were measured in the H-charged samples that were subjected to solution treatment prior to hydrogen charging, compared to the as-built counterparts. Isothermal aging treatment performed at 460 °C for 8 h before hydrogen charging increased the concentration of trapped hydrogen, giving rise to higher hydrogen embrittlement susceptibility.

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Modification of the ZnO(0001) Surface by Adsorption of Hydrogen Atoms

Chemistry Letters ◽

10.1246/cl.200682 ◽

2020 ◽

Author(s):

Probir Chandra Roy ◽

Sher Ali Khan ◽

Chang Min Kim

Keyword(s):

Hydrogen Atoms ◽

Adsorption Of Hydrogen

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Molybdenum-Suboxide Thin Films as Anode Layers in Planar Lithium Microbatteries

Electrochem ◽

10.3390/electrochem1020012 ◽

2020 ◽

Vol 1 (2) ◽

pp. 160-187 ◽

Cited By ~ 1

Author(s):

Ambadi Lakshmi-Narayana ◽

Obili M. Hussain ◽

Chintalapalle V. Ramana ◽

Marco Camacho-Lopez ◽

Ashraf Abdel-Ghany ◽

...

Keyword(s):

Thin Films ◽

Oxygen Pressure ◽

Annealing Temperature ◽

Specific Capacity ◽

Constant Current ◽

Potential Range ◽

Electrochemical Test ◽

Operational Conditions ◽

Si Substrates ◽

Partial Oxygen

In this paper, we investigate the effects of operational conditions on structural, electronic and electrochemical properties on molybdenum suboxides (MoO3-δ) thin films. The films are prepared using pulsed-laser deposition by varying the deposition temperature (Ts), laser fluence (Φ), the partial oxygen pressure (PO2) and annealing temperature (Ta). We find that three classes of samples are obtained with different degrees of stoichiometric deviation without post-treatment: (i) amorphous MoO3-δ (δ < 0.05) (ii) nearly-stoichiometric samples (δ ≈ 0) and (iii) suboxides MoO3-δ (δ > 0.05). The suboxide films 0.05 ≤ δ ≤ 0.25 deposited on Au/Ti/SiO2/flexible-Si substrates with appropriate processing conditions show high electrochemical performance as an anode layer for lithium planar microbatteries. In the realm of simple synthesis, the MoO3-δ film deposited at 450 °C under oxygen pressure of 13 Pa is a mixture of α-MoO3 and Mo8O23 phases (15:85). The electrochemical test of the 0.15MoO3-0.85Mo8O23 film shows a specific capacity of 484 µAh cm−2 µm−1 after 100 cycles of charge-discharge at a constant current of 0.5 A cm−2 in the potential range 3.0-0.05 V.

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