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Study on the Electrocatalytic Oxidation of Formic Acid at the Electrode Modified with Contained-Nd Prussian Blue Analogue

Author: YangMeiXia
Tutor: MaYongJun
School: Northwest Normal University
Course: Analytical Chemistry
Keywords: Chemically modified electrode Prussian Blue Electrocatalytic oxidation Formic acid Polyaniline
CLC: O643.32
Type: Master's thesis
Year: 2011
Downloads: 53
Quote: 1
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Abstract


A direct formic acid fuel cell (DFAFC) is a kind of formic acid as the anode fuel and directly to the oxidation reaction at the electrode on the conversion of electrical energy to an energy unit. DFAFC has a simple structure, convenient refueling, high efficiency series of advantages. In DFAFC, the anode catalyst for formic acid oxidation efficiency and durability of the battery has a very important impact. Therefore, the search for formic acid electrooxidation catalyst has high catalytic activity is a very important research topic. For these reasons, this paper neodymium-containing Prussian Blue Modified Electrode based and composite particles of platinum, polyaniline prepared blends of several multi-composite electrode, which several new modified electrode electrocatalytic oxidation of formic acid were compared with high catalytic activity, good anti-drug resistance and stability, in its capacity as DFAFC anode catalyst has good application research value. Thesis is divided into four chapters: Chapter One: Overview This section introduces the chemically modified electrodes, and polynuclear transition metal hexacyanoferrate film modified electrode and its preparation applications. And outlines the direct formic acid fuel cell development and problems, as a direct formic acid fuel cell on the anode catalyst carrier organic conductive polymer type and structural properties of polyaniline has been elaborated. Chapter II: The first electrodeposition prepared Nd-Fe-WO 4 2 - Cyanide-bridged Mixed-modified platinum electrode (Nd-Fe-WO 4 2 - / Pt), and through SEM and XRD techniques to characterize the modified electrode, respectively, the surface morphology and crystalline structure modifications. Using cyclic voltammetry and chronoamperometry studies of formic acid in the modified electrode electro-oxidation behavior of formic acid was found in the modified electrode electro-catalytic oxidation current density compared with bare platinum electrode increased more than 10 times, and CV back Sweep the anode potential intermediates border belonging to the kickback adsorption peak shape has a great influence. In addition, studies supporting electrolyte H and SO 4 2 - oxidation of formic acid concentration over Cheng Fuan characteristics. The results showed that: formic acid electro-catalytic oxidation peak potential with the main H concentration increases moving forward, with the SO 4 2 - concentration increases negative direction; when these two ions coexist, H of playing a leading role. This indicates that the modified electrode formic acid electro-catalytic oxidation reaction rate controlling step is deprotonation process, but SO 4 2 - / HSO 4 - adsorbed on the electrode surface is conducive to the oxidation reaction carried forward. These conclusions to explain the mechanism of electrocatalytic oxidation of formic acid provides a new experimental basis. Meanwhile, time current curves and the electrode stability experiments show that the modified electrode for electro-catalytic oxidation of formic acid has good catalytic activity and anti-drug capabilities. Chapter Three: In this paper, an electrodeposition method in Nd-Fe-WO 4 2 - Cyanide-bridged Mixed-modified platinum electrode substrate were fabricated platinum particles / Nd-Fe -WO 4 2 - Cyanide-bridged Mixed Complexes composite modified platinum electrode (Pt / Nd-Fe-WO 4 2 - < / sup> / Pt), characterized by SEM morphology of the surface of the electrode. The effects of deposition potential, deposition time, chloroplatinic acid concentration, from the resting potential sweep time on the electrocatalytic oxidation of formic acid. With cyclic voltammetry and chronoamperometry investigated the modified electrode electro-catalytic oxidation of formic acid, the experimental results show that the acid in the modified electrode electro-catalytic oxidation peak current density is about Nd-Fe-WO 4 < / sub> 2 - / Pt electrode is 10 times, and the scan rate 50 mV / s 4 50 mV / s between the oxidation current density and scan rate Square root in a good linear relationship. In addition, the anode of the flyback boundaries of formic acid oxidation, as lower flyback potential of the anode, oxidation leaching toxic reaction intermediate is suppressed, is not conducive to the occurrence of formic acid oxidation. This chapter was prepared by electrochemical platinum particles dispersed polyaniline / Nd-Fe-WO 4 2 - Cyanide-bridged Mixed Complexes composite modified platinum electrode (PAn- Pt / Nd-Fe-WO 4 2 - / Pt), it was characterized by SEM, using cyclic voltammetry and chronoamperometry studies of formic acid in The Electrode Oxidation behavior. It was found that formic acid in the modified electrode reaction closely related to temperature, oxidation current density and temperature, respectively, at 25 4 0 ℃ and 45 5 5 ℃ was well within The linear relationship between the temperature and the low temperature coefficient of the temperature coefficient of the high temperature zone is about 4 times. The square root of scan speed electrocatalytic oxidation current density of formic acid showed a good linear relationship, indicating that the modified electrode in formic acid oxidation reaction is controlled by diffusion, and formic acid electrooxidation CV curve PtO and CO2 reduction peak with flyback boundary anode potential increases gradually. In addition, this will be an inorganic polymer Nd-Fe-WO 4 2 - coatings and organic conductive polymer polyaniline film combined and modified with dispersed platinum particles prepared jointly new composite electrode catalytic performance, stability, anti-drug resistance were associated with Pt / Nd-Fe-WO 4 2 - / Pt electrode considerable, which can be drawn This composite polymer Nd-Fe-WO 4 2 - film also has good voltammetry.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalytic reaction
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