Kinetic Investigation of Quaternary Ni-Fe-P-C Composite Coating as a New Catalyst for Hydrogen Evolution Reaction
A new quaternary Ni-Fe-P-C composite coating was deposited on copper substrates by an electrodeposition process. The morphology, structure and composition of the prepared electrode were characterized using scanning electron microscopy (SEM), X- ray diffraction (XRD) pattern, and energy dispersive X-ray spectroscopy (EDX). The activity of the composite coating toward hydrogen evolution reaction (HER) was evaluated on the basis of the steady-state polarization Tafel curves and electrochemical impedance spectroscopy (EIS) in 1 M NaOH at temperature of 298 K. The experimental results revealed that the HER activity of the Ni-Fe-P-C coatings was enhanced compared with both ternary coatings of Ni-P-C and Ni-Fe-C. The source of its activity was found from its high surface area and its intrinsic properties. It was sufficient to assume the Volmer-Heyrovsky mechanism with the Heyrovsky reaction as the rate- determining step to explain the experimental data. Besides the high electrocatalytic activity, excellent chemical and electrochemical stability were observed for Ni-Fe-P-C composite coating toward the HER in 1 M NaOH at 298 K.
| Main Authors: | , , |
|---|---|
| Format: | Digital revista |
| Language: | English |
| Published: |
Sociedade Portuguesa de Electroquímica
2015
|
| Online Access: | http://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042015000300002 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|