Study of structural and electrochemical characteristics of Co-based hypo–hyper d-electrocatalysts for hydrogen evolution

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

[img]
Preview
Text
2007-Electrochimica Acta.pdf

Download (993Kb) | Preview

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: http://eprints.ugd.edu.mk/id/eprint/4752

Actions (login required)

View Item View Item