Electrocatalytic Activity for the Hydrogen Evolution of the Electrodeposited Co–Ni–Mo, Co–Ni and Co–Mo Alloy Coatings
Agnieszka Laszczyńska , Irena Szczygieł
AbstractThe electrocatalytic activity for the HER of the ternary CoeNieMo and the binary CoeNi and CoeMo alloy coatings is investigated in 1 M KOH solution. The surface morphology and the structure of the studied coatings is characterized by SEM and XRD analysis. The electrocatalytic activity for the HER is evaluated using cyclic voltammetry, electrochemical impedance spectroscopy, cathodic polarization and chronopotentiometry techniques. XRD analysis reveals that all studied coatings are composed of the Co hcp structure. However, alloy deposits with Mo is characterized by more nanocrystalline structure. Electrochemical experiments reveal superior electrocatalytic activity of coatings with Mo in comparison to CoeNi alloy. This is the results of larger real surface area of CoeMo and CoeNieMo alloys, which is confirmed by the higher surface roughness factors (Rf) calculated based on the EIS results. The ternary alloy coating is characterized by the highest Rf parameter and the highest catalytic activity for the HER.
|Journal series||International Journal of Hydrogen Energy, ISSN 0360-3199, e-ISSN 1879-3487, (N/A 140 pkt)|
|Publication size in sheets||0.6|
|Keywords in English||Electrodeposited Co-Based Alloys, Hydrogen Evolution Reaction, Electrocatalytic Activity Surface, Roughness Factor|
|ASJC Classification||; ; ;|
|Publication indicators||= 0; : 2018 = 1.128; : 2018 = 4.084 (2) - 2018=3.969 (5)|
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