Paunovic, Perica and Popovski, Orce (2007) Study of structural and electrochemical characteristics of Co-based hypo–hyper d-electrocatalysts for hydrogen evolution. Journal of the International Society of Electrochemistry Electrochimica Acta, 52 (14). pp. 4640-4648. ISSN 0013-4686
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Abstract
Abstract
Structural and electrochemical characteristics of hypo–hyper d-electrocatalytic materials aimed for preparation of electrodes for hydrogen
evolution were studied. The basic catalytic material was prepared of 10% amorphous Co (grain size <2 nm), 18% amorphous TiO2 and Vulcan
XC-72, by sol–gel procedure. A number of modifications were applied aimed at improving the materials performances: (i) TiO2 was transformed
into anatase by heating at 480 ◦C for 1 h, (ii) multiwalled carbon nanotubes (MWCNT) were used as a catalyst support instead of Vulcan XC-72
and (iii) Mo was added to Co phase in a quantity of 25 at.% (Mo:Co = 1:3).
Both, material’s intrinsic catalytic activity and surface area were affected by these modifications. As a result, the electrocatalytic activity for
hydrogen evolution was improved, e.g. transformation of TiO2 into anatase form lowers the HER overpotential (η) for 15mV at 60mAcm−2.
Introduction of MWCNTs lowered η for 30mV, while addition of Mo to metallic phase for 40mV.
The complete modification of all three catalyst’s components (10% MoCo3 + 18% anatase + MWCNTs) was the most effective with 60mV
decrease of overpotential.
Characterization was made by XRD, SEM, IR and XPS methods. Surface area was measured by means of cyclic voltammetry.
© 2007 Elsevier Ltd. All rights reserved.
Keywords: Hydrogen evolution; Hypo–hyper d-electrocatalysis; Co-based electrocatalysts
| Item Type: | Article |
|---|---|
| Subjects: | Engineering and Technology > Nano-technology |
| Divisions: | Military Academy |
| Depositing User: | Orce Popovski |
| Date Deposited: | 22 Jan 2013 08:42 |
| Last Modified: | 22 Jan 2013 08:42 |
| URI: | https://eprints.ugd.edu.mk/id/eprint/4752 |
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