Manovah David, T. and Wilson, P. and Manju, V. and Palaniappan, A. and Sagayaraj, P. and Ramesh, C. (2017) Electrocatalytic Investigation of Group X Metal Nanoparticles Loaded TiO2 Nanotubes Powder Prepared by Rapid Breakdown Anodization for Selective H2O2 Sensing. Journal of The Electrochemical Society, 164 (7). B356-B365. ISSN 0013-4651

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Amperometric based hydrogen peroxide (H2O2) sensor developed using a composite of Titania (TiO2) nanotubes (NTs) powder individually loaded with Ni, Pd or Pt metal nanoparticles is reported. The bundles of TiO2 NTs powder prepared via rapid breakdown anodization have a length of 5 to 6 μm and outer diameter of 20 to 25 nm. Sodium borohydride based reduction of chloroplatinic acid and palladium chloride with the TiO2 NTs powder resulted in Pt/TiO2 and Pd/TiO2 composite materials. Ni/TiO2 composite was prepared by mixing directly Ni nanoparticles (35 nm) and TiO2 NTs. The electrochemical performance of the Pt/TiO2, Pd/TiO2 and Ni/TiO2 electrodes exhibited better selectivity, sensitivity and wide linear range for the detection of the analyte H2O2, in comparison with pristine TiO2 NTs powder. Among the composites, the Ni/TiO2 electrode exhibited high electrocatalytic activity toward oxidation of H2O2 in 0.1 M NaOH solution. At an applied potential of +0.45 V vs. NCE, the Ni/TiO2 composite electrode exhibits a linear dependence (R2 = 0.997) in the H2O2 concentration up to 3365 μM with a sensitivity of 5.3 μA mM−1 and detection limit of 20 μM. In general, the Pt, Pd and Ni/ TiO2 nanocomposite electrodes exhibit better sensitivity to the detection of H2O2.

Item Type: Article
Uncontrolled Keywords: nano technology; gas sensor; Electrodics
Subjects: Electrodics and Electrocatalysis
Depositing User: Dr. N Meyyappan
Date Deposited: 13 Jun 2019 10:57
Last Modified: 13 Jun 2019 10:57

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