Journal
TOPICS IN CATALYSIS
Volume 65, Issue 5-6, Pages 716-725Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11244-021-01537-7
Keywords
Ethanol electrocatalytic oxidation; Platinum; Ruthenium; Polyaniline; Manganese ferrite
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This study successfully developed PANI-MnFe2O4/Pt/Ru nanocomposite as an effective catalyst for ethanol oxidation process with improved efficiency, stability, and carbon monoxide tolerance, which are essential for practical applications in alkaline direct ethanol fuel cells.
Tailoring effective electrocatalysts for the ethanol oxidation process with low-price, high electrocatalytic activity, and long lifetime is crucial for large-scale application of direct ethanol fuel cells. Herein, it was aimed to provide a facile method for designing Polyaniline-Manganese ferrite (PANI-MnFe2O4) supported nanocatalysts modified with Pt/Ru to be utilized for ethanol electrooxidation. The successful synthesis of the PANI-MnFe2O4/Pt/Ru nanocomposite was confirmed by the physicochemical analysis techniques including Fourier transform infrared spectroscopy, field emission scanning electron microscopy, and X-ray diffraction. The electrooxidation of ethanol at room temperature was investigated using a number of electrochemical characterizations such as cyclic voltammetry, linear sweep voltammetry, and chronoamperometry techniques. In comparison to other electrodes, the PANI-MnFe2O4/Pt-Ru electrode demonstrated superior efficiency in terms of boosting forward current (I-f, 100 mAcm(-2)) and increasing the electrochemically active surface area (ECSA, 30.3) that was required for ethanol molecules during the oxidation process. Furthermore, results demonstrated that introducing Ru and Pt to the PANI-MnFe2O4 support enhanced its efficiency towards the ethanol oxidation reaction by boosting both the stability (94%) and the carbon monoxide tolerance, which are both critical for alkaline direct ethanol fuel cell practical applications. This study paves the way for a novel approach for engineering high-performance, low-cost electrocatalysts that may be utilized as an alternative to commercial electrocatalysts in fuel cell technology.
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