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Preparation, physical-chemical and electrochemical characterization of ZrO2 aerogels modified with H3[PW12O40]

D. GLIGOR1,* , M. BAIA2, V. DANCIU3

Affiliation

  1. Department of Environmental Analysis and Engineering, “Babes-Bolyai” University, 30 Fantanele St., 400294 ClujNapoca, Romania
  2. Department of Biomolecular Spectroscopy, “Babes-Bolyai” University, 1 M. Kogalniceanu St., 400084 Cluj-Napoca
  3. Department of Chemical Engineering-Laboratory of Electrochemical Research, “Babes-Bolyai” University, 11 Arany Janos St. 400028 Cluj-Napoca, Romania

Abstract

This work presents the synthesis of ZrO2 aerogels modified with H3[PW12O40] by different methods, namely: by adding the heteropolyacid during the sol-gel synthesis of ZrO2 gel (method A) or by immersing ZrO2 gel (method B) / aerogel (method C) in H3[PW12O40] solution followed by low temperature supercritical drying / drying at 800 C. The resulted zirconia based aerogels (ZrO2- H3[PW12O40]) were morpho-structurally analyzed by using BET method, X-ray diffraction, Raman and FT-IR spectroscopy. Concentration of Zr, W in ZrO2-H3[PW12O40] aerogels was determinated by using inductively coupled plasma atomic emission spectroscopy (ICP-AES). Electrochemical behavior of ZrO2 aerogels modified with H3[PW12O40] as well as of the unmodified ZrO2 aerogel was studied using cyclic voltammetry. All carbon paste electrodes based on zirconia aerogels exhibited a favorable redox activity. Carbon paste electrodes modified with ZrO2-H3[PW12O40] obtained by methods A and B exhibited a better electrochemical stability and a better electrochemical behavior than that prepared using method C..

Keywords

Zirconia, H3[PW12O40], BET surface area, Raman and FT-IR spectra, Inductively coupled plasma atomic emission spectroscopy, Cyclic voltammetry.

Submitted at: July 5, 2016
Accepted at: Oct. 10, 2017

Citation

D. GLIGOR, M. BAIA, V. DANCIU, Preparation, physical-chemical and electrochemical characterization of ZrO2 aerogels modified with H3[PW12O40], Journal of Optoelectronics and Advanced Materials Vol. 19, Iss. 9-10, pp. 650-657 (2017)