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

Journal Article · Mon Jan 31 23:00:00 EST 1994 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2054736· OSTI ID:7305137

Fan, C; Piron, D L; Sleb, A; Paradis, P ^[1]

---

1. Ecole Polytechnique de Montreal, Quebec (Canada). Dept. de Metallurgie et de Genie des Materiaux

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 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 o 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 te electrodes and the effect of their 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.

• OSTI ID: 7305137
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 141:2; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080101* -- Hydrogen-- Production-- Electrolysis
ALKALI METAL COMPOUNDS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
COBALT
DEPOSITION
ELECTROCATALYSTS
ELECTRODEPOSITION
ELECTRODES
ELECTROLYSIS
ELEMENTS
GAS GENERATORS
HYDROGEN COMPOUNDS
HYDROGEN GENERATORS
HYDROGEN PRODUCTION
HYDROXIDES
KINETICS
LYSIS
METALS
MOLYBDENUM
NICKEL
OXYGEN COMPOUNDS
PERFORMANCE TESTING
POTASSIUM COMPOUNDS
POTASSIUM HYDROXIDES
REACTION KINETICS
SURFACE COATING
TESTING
TRANSITION ELEMENTS
TUNGSTEN