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Title

FORMIC ACID ELECTROOXIDATION ON A POROUS NANOSTRUCTURED CO/CO-NI-AU ELECTRODE IN ALKALINE MEDIA

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Abstract

 THE ELECTROCATALYTIC OXIDATION OF FORMIC ACID ON CO/CO-NI-AU ELECTRODE IN ALKALINE SOLUTION HAS BEEN INVESTIGATED. A NEW POROUS CO/CO-NI-AU NANOCATALYST PREPARED BY ELECTRODEPOSITION PROCESS AND SIMPLE GALVANIC REPLACEMENT TECHNIQUE IN ALKALINE GOLD SOLUTION. THE PROCEDURE CONSISTED OF THE ELECTRODEPOSITION OF CO-NI-ZN ON THE CO COATING, WITH SUBSEQUENT REPLACEMENT OF THE ZN BY AU AT OPEN CIRCUIT IN AN AU CONTAINING ALKALINE SOLUTION.THE MORPHOLOGY AND SURFACE CHARACTERISTICS OF RESULT ELECTRODE WERE INVESTIGATED USING SCANNING ELECTRON MICROSCOPY (SEM) AND ENERGY DISPERSIVE X-RAY SPECTROSCOPY (EDX) RESPECTIVELY. THE RESULTS SHOWED THAT THE CO/CO-NI-AU COATING WERE POROUS AND COMPOSED OF DISCRETE AU NONOPARTICALES WITH THE CRYSTALLITE SIZE OF ABOUT 60-80 NM. ELECTROCATALYTIC ACTIVITY TOWARD THE FORMIC ACID ELECTROOXIDATION WAS ASSESSED BY CYCLIC VOLTAMMETRY (CV), CHORONOAMPEROMETRY AND ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY (EIS) METHODS. MOREOVER, THE EFFECTS OF VARIOUS PARAMETERS SUCH POTENTIAL, SCAN RATE (10- 100 MVS-1), FORMIC ACID CONCENTRATION AND SOLUTION TEMPERATURE (25-65OC) ON THE ELECTRO-OXIDATION OF FORMIC ACID HAVE ALSO BEEN INVESTIGATED. THE CALIBRATION CURVE WAS LINEAR IN THE CONCENTRATION RANGE 1 MM TO 10 MM WITH THE DETECTION LIMIT OF 0.1 MM THEREFORE THE CO/CO-NI-AU CATALYSTS CAN BE POTENTIAL ANODE CATALYSTS FOR THE DIRECT FORMIC ACID FUEL CELLS (DFAFC) [3].

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