Nanocomposite electrode materials in alcohol oxidation reactions

• Autorzy: Martyła A. , Kopczyk M. , Osińska-Broniarz M. , Marciniak P. , Przekop R.

Warianty tytułu

PL

Nanokompozytowe materiały elektrodowe w reakcjach utleniania alkoholi

• Języki publikacji: EN

Abstrakty

EN

This paper presents an electroactivity comparison of Pt/SnO2 nanocomposites with different metal phase precursors in a methanol oxidation reaction. One of them is a water solution of hexachloroplatinic acid and the second is the platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex (known as Karstedt’s catalyst). The Pt/SnO2 system has a broad range of applications in various sectors of industry. It is a very popular heterogeneous and electrochemical catalyst as well, especially in fuel cells. This effect is due to the presence of platinum. As the most expensive component of the catalyst it is still a barrier to its widespread use, hence, the constant search for new, cost-effective methods of obtaining this kind of systems. The aim of the research was to obtain a highly active Pt/SnO2 catalyst with a low metal concentration in an electrochemical system. The small size of the Pt crystallites should result in high activity of the Pt/SnO2 system. We proposed two synthesis methods of the platinum catalyst based on the sol-gel technique and tin(IV) acetate as the SnO2 precursor in conjunction with the use of inorganic and organic sources of the metallic phase. The presented method of SnO2 synthesis allows for obtaining nano-support and in the next step - a nano-catalyst. The system structures were investigated using TEM and XRD techniques to describe their thermal structural evolution. To study the influence of the metallic phase precursor, we used cyclic voltammetry (in acidic media), which is the best method to check the activity of the electrocatalyst. The results showed high electrocatalytical activity of the nanocomposites, irrespective of the metal phase source. The systems obtained from an organosilicone precursor demonstrate high temperature stability.

PL

Prezentowana praca zawiera porównanie elektroaktywności kompozytów Pt/SnO2 w reakcji utleniania metanolu. Kompozyty te pochodzą z dwóch różnych prekursorów. Jednym z nich jest wodny roztwór kwasu sześciochloroplatynowego, a drugim kompleks platyna(0)-1,3-divinylo-1,1,3,3-tetrametylodisiloksan, zwany też katalizatorem Karstedta. Układ Pt/SnO2 ma szerokie spektrum zastosowań jako katalizator w procesach reformingu węglowodorów, katalizator w ogniwach paliwowych. Jednak wysoki koszt platyny stanowi barierę w ich powszechnym stosowaniu. W pracy proponujemy dwie metody otrzymywania takiego układu wykorzystujące technikę zol-żel i octan cyny jako prekursor SnO2 oraz dwa rodzaje prekursorów fazy metalicznej. Otrzymane układy zostały zbadane za pomocą cyklicznej woltamperometrii, która jest najlepszą techniką sprawdzenia elektroaktywności. Ponadto, przeprowadzono badania kompozytów za pomocą technik XRD oraz TEM, które wykazały istotne zależności między ich strukturą a obróbką termiczną. Rezultaty badań wskazują na wysoką aktywność elektrochemiczną kompozytów Pt/SnO2 niezależnie od rodzaju prekursora. Kompozyty otrzymane z wodnego roztworu kwasu sześciochloroplatynowego dają wyższe wartości prądowe, z kolei te uzyskane z prekurosra krzemoorganicznego wykazują wyższą stabilność temperaturową.

Słowa kluczowe

EN

sol-gel; composite; electrocatalyst

PL

zol-żel; kompozyt; elektrokatalizator

• Wydawca: Polskie Towarzystwo Materiałów Kompozytowych
• Czasopismo: Composites Theory and Practice
• Rocznik: 2015
• Tom: R. 15, nr 2
• Strony: 83--87
• Opis fizyczny: Bibliogr. 18 poz., rys.

Twórcy

autor

Martyła A.

• Institute of Non-Ferrous Metals, Division in Poznan, Central Laboratory of Batteries and Cells, ul. Forteczna 12, 61-362 Poznan, Poland

autor

Kopczyk M.

• Institute of Non-Ferrous Metals, Division in Poznan, Central Laboratory of Batteries and Cells, ul. Forteczna 12, 61-362 Poznan, Poland

autor

Osińska-Broniarz M.

• Institute of Non-Ferrous Metals, Division in Poznan, Central Laboratory of Batteries and Cells, ul. Forteczna 12, 61-362 Poznan, Poland

autor

Marciniak P.

• Poznan Science and Technology Park of Adam Mickiewicz University Foundation, ul. Rubiez 46, 61-612 Poznan, Poland

autor

Przekop R.

• Centre of Advanced Technologies, Adam Mickiewicz University, ul. Grunwaldzka 6, 60-780 Poznan, Poland

Bibliografia

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