ELECTROCATALYTIC PERFORMANCE OF LANTHANUM PHOSPHATE-BONDED POROUS-ELECTRODES FOR THE HYDROGEN EVOLUTION REACTION IN 30WT-PERCENT ALKALINE-SOLUTION

Citation
H. Dumont et al., ELECTROCATALYTIC PERFORMANCE OF LANTHANUM PHOSPHATE-BONDED POROUS-ELECTRODES FOR THE HYDROGEN EVOLUTION REACTION IN 30WT-PERCENT ALKALINE-SOLUTION, International journal of hydrogen energy, 18(9), 1993, pp. 719-725
Citations number
26
Categorie Soggetti
Energy & Fuels","Environmental Sciences","Physics, Atomic, Molecular & Chemical
ISSN journal
03603199
Volume
18
Issue
9
Year of publication
1993
Pages
719 - 725
Database
ISI
SICI code
0360-3199(1993)18:9<719:EPOLPP>2.0.ZU;2-D
Abstract
The electrocatalytic properties of lanthanum phosphate-bonded nickel p owder (LPBN), LPBN-ruthenium and LPBN-rhodium electrodes were investig ated for the hydrogen evolution reaction (HER) in 30wt% alkaline solut ion at 70-degrees-C. The kinetic parameters of the HER were determined by the steady-state polarization curve method. The influence of disso lved metallic impurities such as iron and heavy metals on the electroc atalytic activity of different types of LPBN electrodes was considered . Long-term performance tests were conducted in 30wt% alkaline solutio ns at 70-degrees-C by applying a current density of 375 mA cm-2 during 210 h, followed by 24 h at open circuit potential, then reapplying th e same current density. The effect of long-term experiments on the cat hode morphology was investigated by SEM and X-Tay fluorescence methods . Heavy metal deposition had only little effect on the highly porous L PBN, LPBN-Ru, and LPBN-Rh electrodes, especially on the most active of these, and a stable performance toward the HER was obtained.