docDetermination of the electrochemical surface area for CNFs – Pt
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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
