Improvement of performances of complex non-platinum electrode materials for hydrogen evolution
Journal
Electrochimica Acta
Date Issued
2006-12
Author(s)
P. Paunovic, O. Popovski, A. Dimitrov, D. Slavkov, E. Lefterova, S. Hadzi Jordanov
DOI
10.1016/j.electacta.2005.12.059
Abstract
Structural and electrochemical characteristics of hypo–hyper d-electrocatalytic materials aimed for preparation of electrodes for hydrogen evolution were studied and modified in order to improve their performances. All studied materials were of general composition 10% Ni + 18% TiO2 +C.
All materials were prepared of amorphous or crystalline TiO2, crystalline Ni or NiCo (10–20 nm) and Vulcan XC-72, by sol–gel procedure. Both, material’s intrinsic catalytic activity and surface area were affected by applied modifications. As a result, the electrocatalytic activity was improved, e.g. transformation of TiO2 into anatase form lowers the HER overpotential for 60mV. Introduction of MWCNTs was even more effective, lowering η for 120mV. Co addition to metallic phase lowers η for utmost 195mV. Combined modification of TiO2 and carbon substrate lowers η for 145mV, while the complete modification of all three catalyst’s components was the most effective with 230mV decrease of overpotential.
All materials were prepared of amorphous or crystalline TiO2, crystalline Ni or NiCo (10–20 nm) and Vulcan XC-72, by sol–gel procedure. Both, material’s intrinsic catalytic activity and surface area were affected by applied modifications. As a result, the electrocatalytic activity was improved, e.g. transformation of TiO2 into anatase form lowers the HER overpotential for 60mV. Introduction of MWCNTs was even more effective, lowering η for 120mV. Co addition to metallic phase lowers η for utmost 195mV. Combined modification of TiO2 and carbon substrate lowers η for 145mV, while the complete modification of all three catalyst’s components was the most effective with 230mV decrease of overpotential.
File(s)![Thumbnail Image]()
Loading...
Name
2006 EA.pdf
Size
736.73 KB
Format
Adobe PDF
Checksum
(MD5):3e0d3a7d9e8a30958d25e8ca2d95bc19