Effect of activation/purification of multiwalled carbon nanotubes (MWCNTs)on the activity of non-platinum based hypo-hyper d-electrocatalysts for hydrogen evolution

Paunovic, Perica and Dimitrov, Aleksandar and Popovski, Orce (2009) Effect of activation/purification of multiwalled carbon nanotubes (MWCNTs)on the activity of non-platinum based hypo-hyper d-electrocatalysts for hydrogen evolution. Materials Research Bulletin, 44 (9). pp. 1816-1821.

[img]
Preview
Text
2009-Materials Research Bulletin 44.pdf

Download (566Kb) | Preview

Abstract

Commercial multiwalled carbon nanotubes (MWCNTs) were used as a catalyst support for non-platinum hypo-hyper d-electrocatalysts. In order to improve the performance of these catalysts, activation/ purification of MWCNTs in acid medium (HNO3) was carried out. The physical and surface changes of MWCNTs were investigated by DTA/TGA analysis, Raman spectroscopy, and cyclic voltammetry. Structural changes of the electrocatalysts were observed by infrared spectroscopy and SEM. Their use as a support for electrocatalysts for hydrogen evolution was demonstrated, and shown to be more suitable compared to the traditional carbon support material � carbon black (Vulcan XC-72). The electrocatalysts consisted of 10% Co + 18% TiO2 + MWCNTs. Activation/purification removes the amorphous carbon phase in theMWCNTs. As a result of both shortening and opening of carbon nanotubes, better dispersion of metallic particles (the active catalytic centers) was achieved. Thus, trans-particle and inter-particle porosity of the electrocatalytic material was improved, implying increase of catalytic activity for hydrogen evolution.

Item Type: Article
Subjects: Engineering and Technology > Materials engineering
Divisions: Military Academy
Depositing User: Orce Popovski
Date Deposited: 22 Jan 2013 08:55
Last Modified: 22 Jan 2013 08:55
URI: http://eprints.ugd.edu.mk/id/eprint/4756

Actions (login required)

View Item View Item