Determination of the electrochemical surface area for CNFs – Pt

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Transcrição

Determination of the electrochemical surface area for CNFs – Pt
Wissen. Was praktisch zählt.
Bestimmungen der elektrochemischen
Oberfläche für CNFs – Pt-Katalysator
mit Cyclovoltammetrie
Determination of the electrochemical surface area for CNFs –
Pt electro catalyst using cyclic voltammetry
Autoren: Roxana Muntean, Ulrich Rost, Gabriela Marginean, Waltraut Brandl
Purpose
• The possibility of preparing CNFs decorated with platinum by electrochemical methods was tested, using a hexachloroplatinic solution bath;
• Experiments were carried out with the aid of a Potentiostat/Galvanostat Ivium Technologies Vertex, 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
• Morphology and content of platinum were investigated by SEM/EDX and TG
Experimental
• Cyclic voltammetry in
• CNFs deposition onto carbon paper by HVOF method;
0.5 M H2SO4 solution;
• CNFs activation process by Plasma Oxygen Treatment • Scan rate 100 mV/s;
with different parameters;
• 200 cycles
• Pt electrodeposition from hexachloroplatinic acid bath.
Schematic process for obtaining CNFs-Pt electrodes
Electrochemical cell
assembly – 3 electrodes
Cyclic voltammograms obtained for
CNFs – Pt electrodes
Electrochemical surface area obtained for
CNFs – Pt electrodes
Thermogravimetric Analyzer
TG measurements for CNFs – Pt electrodes
Pt loading obtained for CNfs –
Pt electrodes from TGA
Conclusions
• The electrochemical surface area for different CNFs – Pt catalysts was determined by cyclic voltammetry;
• The highest active surface of platinum was obtained for the samples with CNFs functionalised in plasma
treatment with 80 W for 30 min;
• Cyclic voltammetry is a suitable method for estimation of the real surface area for catalyst particles;
• The SEM micrographs revealed the distrution of platinum particles on the carbon substrate and the
EDX analyse confirms also the presence of platinum
This experimental work is accomplished in the frame of the research and development project NanoFuelCells (MIWF-NRW; PTJ).
Kontakt
Prof. Dr. Waltraut Brandl
Neidenburger Straße 43
45877 Gelsenkirchen
Tel.: 0209-9596-168
E-Mail: [email protected]
Westfälische Hochschule
Fachbereich
Maschinenbau und Facilities Manangement
www.w-hs.de

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