Preparation and characterization of CoeRu/TiO2/MWCNTs electrocatalysts in PEM hydrogen electrolyzer
Journal
International Journal of Hydrogen Energy
Date Issued
2011-08
Author(s)
Perica Paunovic, Dafinka Stoevska Gogovska, Orce Popovski, Antonia Stoyanova, Evelina Slavcheva, Elefteria Lefterova, Peter Iliev, Aleksandar T. Dimitrov, Svetomir Hadzi Jordanov
DOI
http://dx.doi.org/10.1016/j.ijhydene.2011.04.014
Abstract
The subject of this study is preparation and characterization of hypoehyper d-electrocatalysts
with reduced amount of precious metals aimed for water electrolysis. The studied
electrocatalysts contain 10% mixed metallic phase (Co:Ru ¼ 1:1 wt., Co:Ru ¼ 4:1 wt. and
Co:Ru:Pt ¼ 4:0.5:0.5 wt.), 18% TiO2 as a crystalline anatase deposited on multiwalled carbon
nanotubes (MWCNTs). Previously, MWCNTs were activated in 28% nitric acid. As a reference
electrocatalyst for hydrogen evolution reaction, corresponding electrocatalysts with
pure Pt metallic phase and mixed CoPt (Co:Pt ¼ 1:1 wt.) metallic phase were prepared. Also,
as a reference electrocatalyst for oxygen evolution reaction, electrocatalyst with pure Ru
metallic phase was prepared.
The prepared electrocatalysts were structurally characterized by means of XPS, XRD,
TEM, SEM and FTIR analysis.
Electrochemical characterization was performed by means of cyclic voltammetry and
potentiodynamic method in the PEM hydrogen electrolyzer. The range of the catalytic
activity for hydrogen evolution of studied electrocatalysts was the following: CoRuPt
(4:0.5:0.5) > CoPt (1:1) > Pt > CoRu (1:1) > CoRu (4:1). The order of the catalytic activity for
oxygen evolution was the following: CoRu (1:1) > Ru > CoRu (4:1) > Pt > CoRuPt
(4:0.5:0.5) > CoPt (1:1).
with reduced amount of precious metals aimed for water electrolysis. The studied
electrocatalysts contain 10% mixed metallic phase (Co:Ru ¼ 1:1 wt., Co:Ru ¼ 4:1 wt. and
Co:Ru:Pt ¼ 4:0.5:0.5 wt.), 18% TiO2 as a crystalline anatase deposited on multiwalled carbon
nanotubes (MWCNTs). Previously, MWCNTs were activated in 28% nitric acid. As a reference
electrocatalyst for hydrogen evolution reaction, corresponding electrocatalysts with
pure Pt metallic phase and mixed CoPt (Co:Pt ¼ 1:1 wt.) metallic phase were prepared. Also,
as a reference electrocatalyst for oxygen evolution reaction, electrocatalyst with pure Ru
metallic phase was prepared.
The prepared electrocatalysts were structurally characterized by means of XPS, XRD,
TEM, SEM and FTIR analysis.
Electrochemical characterization was performed by means of cyclic voltammetry and
potentiodynamic method in the PEM hydrogen electrolyzer. The range of the catalytic
activity for hydrogen evolution of studied electrocatalysts was the following: CoRuPt
(4:0.5:0.5) > CoPt (1:1) > Pt > CoRu (1:1) > CoRu (4:1). The order of the catalytic activity for
oxygen evolution was the following: CoRu (1:1) > Ru > CoRu (4:1) > Pt > CoRuPt
(4:0.5:0.5) > CoPt (1:1).
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