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Determination of the electrochemical surface area for CNTs-PT electro catalyst using cyclic voltammetry

  • Platinum is one of the most effective electro catalysts for PEMFCs (proton exchange membrane fuel cells), but because of its prohibitive price, the use of this metal in industrial purposes is limited. As a consequence, during last years, several materials have been investigated, in order to obtain an efficient catalyst for both ORR (oxygen reduction reaction) and HOR (hydrogen oxidation reaction), which can replace the expensive platinum but preserving the same properties: high electrical conductivity, structural stability and good corrosion resistance. Moreover, one of the most important parameters for catalyst materials is the electrochemical surface area (real surface area), which has a strong influence on the reaction rate and also on the current density. CNFs (carbon nanofibers) are considered to be a promising catalyst support material due to their unique characteristics, excellent mechanical, electrical and structural properties, high surface area and nevertheless, good interaction with platinum particles. The possibility of preparing CNFs decorated with platinum by electrochemical methods was tested, using a hexachloroplatinic solution bath. The experiments were carried out with the aid of a Potentiostat/Galvanostat MMate 510, in a three – electrode cell. The aim of the present work was to determine the electrochemical surface area of the CNFs – Pt catalysts, using an electrochemical method. The obtained results correlate very well with the particles size and distribution of platinum, analyzed by SEM (scanning electron microscopy) respectively with the quantity of deposited platinum determined by TG (thermo gravimetrical analyses). Cyclic voltammetry is a suitable method for estimation of the real surface area for catalyst particles.

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Author:Roxana Muntean, Ulrich Rost, Gabriela Marginean, Nicolae Vaszilcsin
Parent Title (English):Konferenz: BraMat 2015, 9th International Conference on Materials Science & Engineering, March 5-7, 2015. Book of Abstracts
Publisher:Transilvania University of Brasov - Romania
Place of publication:Brasov
Editor: Transilvania University of Brasov - Romania. Faculty of Materials Science and Engineering
Document Type:Conference Proceeding
Date of Publication (online):2017/01/31
Date of first Publication:2015/03/05
Publishing Institution:Westfälische Hochschule Gelsenkirchen Bocholt Recklinghausen
Release Date:2017/02/02
First Page:170
Departments / faculties:Institute / Westfälisches Energieinstitut
Licence (German):License LogoEs gilt das Urheberrechtsgesetz

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