Study of electrodeposited nickel-molybdenum, nickel-tungsten, cobalt-molybdenum, and cobalt-tungsten as hydrogen electrodes in alkaline water electrolysis

Electrodeposited nickel-molybdenum, nickel-tungsten, cobalt-molybdenum, and cobalt-tungsten were characterized for the hydrogen evolution reaction (HER) in the electrolysis of 30 w/o KOH alkaline water at 25 deg C. The rate-determining step (rds) of the HER was suggested based on the Tafel slope of...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 1994-02, Vol.141 (2), p.382-387
Main Authors: CHONGLUN FAN, PIRON, D. L, SLEB, A, PARADIS, P
Format: Article
Language:English
Subjects:
08 HYDROGEN
080101 - Hydrogen- Production- Electrolysis
ALKALI METAL COMPOUNDS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
Chemistry
COBALT
DEPOSITION
ELECTROCATALYSTS
Electrochemistry
ELECTRODEPOSITION
ELECTRODES
ELECTROLYSIS
ELEMENTS
Exact sciences and technology
GAS GENERATORS
General and physical chemistry
HYDROGEN COMPOUNDS
HYDROGEN GENERATORS
HYDROGEN PRODUCTION
HYDROXIDES
KINETICS
Kinetics and mechanism of reactions
LYSIS
METALS
MOLYBDENUM
NICKEL
OXYGEN COMPOUNDS
PERFORMANCE TESTING
POTASSIUM COMPOUNDS
POTASSIUM HYDROXIDES
REACTION KINETICS
SURFACE COATING
TESTING
TRANSITION ELEMENTS
TUNGSTEN
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Summary:Electrodeposited nickel-molybdenum, nickel-tungsten, cobalt-molybdenum, and cobalt-tungsten were characterized for the hydrogen evolution reaction (HER) in the electrolysis of 30 w/o KOH alkaline water at 25 deg C. The rate-determining step (rds) of the HER was suggested based on the Tafel slope of polarization and the capacitance of electrode-solution interface determined by ac impedance measurement. The HER on the nickel- and cobalt-based codeposits was enhanced significantly compared with that on the electrolytic nickel and cobalt with comparable deposit loadings. The decrease in the HER overpotential was more pronounced on the molybdenum-containing codeposits, particularly on cobalt-molybdenum which also showed a high stability. The enhancement of the HER was attributed to both the synergetic composition and the increased active surface of the codeposits. The real electrocatalytic activity of the electrodes and the effect of their surface increase were distinguished quantitatively. The linear relations between HER overpotential and surface roughness factor of the electrodes on a Y-log(X) plot were obtained experimentally and interpreted based on the Tafel law.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.2054736