Promoting the effect of cationic substitution on thermal stability and redox properties of new synthesized Keggin type lacunary polyoxometalates (L-POMs) Ni2.5PMo11
M(H2O)O39 (M = Co, Fe, Cu, Zn)
Author:
El Arrouji Imane1, Oulmekki Abdallah1, Harrach Ahmed1, Taoufik Mostafa2, Lefebvre Frédéric3, Toyir Jamil1ORCID
Affiliation:
1. Laboratoire des Procédés, Matériaux et Environnement (LPME) , Université Sidi Mohammed Ben Abdellah , Taza , Morocco 2. Laboratoire de Chimie Organométallique de Surface (LCOMS) , Université Lyon 1 , Villeurbanne , France 3. Laboratoire de Chimie Organométallique de Surface (LCOMS) , Ecole Supérieure de Chimie Physique Electronique , Villeurbanne , France
Abstract
Abstract
New lacunary Keggin type polyoxometalate salts (Ni2.5PMo11
M(H2O)O39/M = Co, Fe, Cu, Zn), were synthesized using the inorganic condensation method. X-ray diffraction and infrared spectroscopy results showed that the Keggin structure of the salts was preserved. The thermal stability was checked by differential scanning calorimetry coupled with thermogravimetric analysis showing that the thermal resistance was significantly improved by the incorporation of the metals into polyoxometalates. Proton and molybdenum substitution respectively by nickel and cobalt, iron, copper and zinc metals induced a positive effect on the crystallographic configuration of the prepared salts allowing them a better thermal resistance (up to 580 °C). Cyclic voltammetry revealed an interesting electrochemical property of synthesized samples, especially for Ni2.5PMo11Zn(H2O)O39 sample in which the presence of zinc greatly boosted the redox behavior.
Publisher
Walter de Gruyter GmbH
Subject
Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics
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