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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Synthesis and electrocatalytic performance of MnO2-promoted Ag@Pt/MWCNT electrocatalysts for oxygen reduction reaction
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Synthesis and electrocatalytic performance of MnO2-promoted Ag@Pt/MWCNT electrocatalysts for oxygen reduction reaction

机译：MnO2助催化剂Ag @ Pt / MWCNT的合成及电催化氧化还原反应性能

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摘要

Two forms of crystalline MnO2 were synthesized by a hydrothermal method, and MnO2-doped Ag@Pt/ MWCNT composites were prepared by ultrasonic treatment for oxygen reduction reaction in proton exchange membrane fuel cells (PEMFC). The morphology of the electrocatalyst samples was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). We found that the Ag@Pt/MWCNTs catalyst exhibited a core-shell nanostructure and the two forms of MnO2 were α-MnO2 and β-MnO2. The electrochemical properties of the electrocatalyst samples were studied by cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS) in an acidic medium. The results demonstrated that Agl0%@Ptl0%/MWCNTs-α-MnO220% had the largest electrochemical activity area (85.83 m~2 g~(-1)) of all electrocatalysts and the oxygen reduction reaction on the electrocatalyst proceeds through a 4e~- reduction pathway.
机译：通过水热法合成了两种形式的结晶MnO2，并通过超声处理制备了质子交换膜燃料电池（PEMFC）中的氧还原反应的MnO2掺杂的Ag @ Pt / MWCNT复合材料。通过X射线衍射（XRD），扫描电子显微镜（SEM）和高分辨率透射电子显微镜（HRTEM）对电催化剂样品的形态进行了表征。我们发现，Ag @ Pt / MWCNTs催化剂表现出核-壳纳米结构，MnO2的两种形式为α-MnO2和β-MnO2。通过循环伏安法（CV），线性扫描伏安法（LSV），计时电流法（CA）和电化学阻抗谱（EIS）在酸性介质中研究了电催化剂样品的电化学性质。结果表明，Agl0％@ Ptl0％/MWCNTs-α-MnO220％在所有电催化剂中具有最大的电化学活性面积（85.83 m〜2 g〜（-1）），并且在电催化剂上的氧还原反应通过4e〜进行。 -减少途径。

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