Tribologically-driven steady-state hydrogen evolution from mild steel by electrochemical extraction technique

1989 ◽  
Vol 20 (3) ◽  
pp. 557-560 ◽  
Author(s):  
Jong-Sang Kim ◽  
Su-il Pyun
Keyword(s):  
Steady State ◽  
Mild Steel ◽  
Hydrogen Evolution ◽  
Extraction Technique ◽  
Electrochemical Extraction

Steady state hydrogen evolution enhanced during the abrasive wear from mild steel

Wear ◽  
1988 ◽  
Vol 124 (3) ◽  
pp. 331-336 ◽  
Author(s):  
Pyun Su-Il ◽  
Kim Jong-Sang ◽  
Bertram Frisch ◽  
Christopher Messerschmidt
Keyword(s):  
Steady State ◽  
Mild Steel ◽  
Abrasive Wear ◽  
Hydrogen Evolution

Hydrogen evolution reaction at nickel boride electrodes in aqueous and in aqueous methanolic and ethanolic solutions

1996 ◽  
Vol 74 (3) ◽  
pp. 380-388 ◽  
Author(s):  
Behzad Mahdavi ◽  
Danielle Miousse ◽  
Joël Fournier ◽  
Hugues Ménard ◽  
Jean Lessard
Keyword(s):  
Steady State ◽  
Key Words ◽  
Kinetic Parameters ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Constant Phase Element ◽  
Ac Impedance ◽  
Nickel Boride ◽  
Impedance Data ◽  
Electrocatalytic Behaviour

The hydrogen evolution reaction (HER) was investigated at nickel boride pressed powder electrodes in aqueous and in aqueous methanolic (ethanolic) alkaline (1 M NaOH) solutions in the presence and the absence of NaCl (0.1 M) and H3BO3 (0.1 M) at 25 °C by the steady-state polarization and ac impedance techniques. The ac impedance data were analyzed using the constant-phase element (CPE) model. It was found that the electrocatalytic behaviour of a nickel boride electrode for the HER was the same in all the above media and that the HER proceeds via the Volmer–Heyrovsky mechanism. The kinetic parameters of the HER were determined. Key words: hydrogen evolution reaction, nickel boride electrodes, Tafel curves, ac impedance, kinetic parameters.

scholarly journals Fe-Mo alloy coatings as cathodes in chlorate production process

2016 ◽  
Vol 70 (1) ◽  
pp. 81-89 ◽  
Author(s):  
Ljiljana Gajic-Krstajic ◽  
Nevenka Elezovic ◽  
Borka Jovic ◽  
Gian Martelli ◽  
Vladimir Jovic ◽  
...  
Keyword(s):  
Mild Steel ◽  
Current Efficiency ◽  
Hydrogen Evolution ◽  
Partial Replacement ◽  
Complete Suppression ◽  
Cathode Reaction ◽  
Mo Catalyst ◽  
Potentiometric Titration Method ◽  
Steel Cathode ◽  
Chlorate Production

The aim of this study was to gain a better understanding of the feasibility of partial replacement of dichromate, Cr(VI), with phosphate buffer, focusing on the cathode reaction selectivity for hydrogen evolution on mild steel and Fe-Mo cathodes in undivided cell for chlorate production. To evaluate the ability of phosphate and Cr(VI) additions to hinder hypochlorite and chlorate reduction, overall current efficiency (CE) measurements in laboratory cell for chlorate production on stationary electrodes were performed. The concentration of hypochlorite was determined by a conventional potentiometric titration method using 0.01 mol dm-3 As2O3 solution as a titrant. The chlorate concentration was determined by excess of 1.0 mol dm-3 As2O3 solution and excess of arsenic oxide was titrated with 0.1 mol dm-3 KBrO3 solution in a strong acidic solution. Cathodic hypochlorite and chlorate reduction were suppressed efficiently by addition of 3 g dm-3 dichromate at both cathodes, except that Fe-Mo cathode exhibited higher catalytic activity for hydrogen evolution reaction (HER). The overvoltage for the HER was around 0.17 V lower on Fe-Mo cathode than on mild steel at the current density of 3 kA m-2. It was found that a dichromate content as low as 0.1 g dm-3 is sufficient for complete suppression of cathodic hypochlorite and chlorate reduction onto Fe-Mo catalyst in phosphate buffering system (3 g dm-3 Na2HPO4 + NaH2PO4). The overall current efficiency was practically the same as in the case of the presence of 3 g dm-3 dichromate buffer (98 %). However, for the mild steel cathode, the overall current efficiency for the chlorate production was somewhat lower in the above mentioned mixed phosphate + dichromate buffering system (95%) than in the pure dichromate buffering solution (97.5%).

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