Abstract Suitable electrocatalyst support materials with improved catalytic activity, long-time stability and durability are the most important parts of fuel cells. This study explains synthesis of polyaniline-multiwalled carbon nanotubes-tin oxide (PANI-MWCNTs-SnO2) on titanium (Ti) mesh substrate by the facile electrodeposition method for its use as a novel support for palladium (Pd) catalyst. The surface morphology and composition of prepared electrodes were investigated by means of field emission scanning electron microscopy (FESEM), FT-IR (Fourier transform infrared) and energy dispersive X-ray (EDX) techniques. The catalytic activity and stability of fabricated electrodes towards ethanol oxidation in alkaline media were studied by cyclic voltammetry, linear sweep voltammetry and chronoamperometry measurements. High current density (64.1 mA cm−2), low onset potential (−0.725 V) and high electrochemically active surface area (26.27 m2 g-1) were unique features of Pd/PANI-MWCNTs-SnO2/Ti electrode. Other electrochemical tests, Tafel analysis, CO-stripping voltammetry, long-time stability and electrochemical impedance spectroscopy (EIS) indicated that the Pd/PANI-MWCNTs-SnO2/Ti electrode has the best performance for ethanol oxidation in comparison with other prepared electrodes. Therefore, obtained results demonstrated that the Pd/PANI-MWCNTs-SnO2/Ti electrode can be a promising candidate towards ethanol oxidation reaction for use in direct ethanol fuel cells.

中文翻译：

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PANI-MWCNTs-SnO2纳米复合材料负载钯的电化学合成作为碱性介质中乙醇氧化的新型催化剂

摘要 具有改进催化活性、长期稳定性和耐久性的合适的电催化剂载体材料是燃料电池最重要的组成部分。本研究解释了通过简便的电沉积方法在钛 (Ti) 网状基材上合成聚苯胺-多壁碳纳米管-氧化锡 (PANI-MWCNTs-SnO2) 作为钯 (Pd) 催化剂的新型载体。通过场发射扫描电子显微镜 (FESEM)、FT-IR (傅里叶变换红外) 和能量色散 X 射线 (EDX) 技术研究了制备的电极的表面形貌和组成。通过循环伏安法、线性扫描伏安法和计时电流法测量，研究了制备的电极对碱性介质中乙醇氧化的催化活性和稳定性。高电流密度 (64. 1 mA cm-2)、低起始电位 (-0.725 V) 和高电化学活性表面积 (26.27 m2 g-1) 是 Pd/PANI-MWCNTs-SnO2/Ti 电极的独特特征。其他电化学测试、Tafel 分析、CO 溶出伏安法、长期稳定性和电化学阻抗谱 (EIS) 表明，与其他制备的电极相比，Pd/PANI-MWCNTs-SnO2/Ti 电极具有最佳的乙醇氧化性能。因此，获得的结果表明，Pd/PANI-MWCNTs-SnO2/Ti 电极可以成为乙醇氧化反应的有希望的候选物，用于直接乙醇燃料电池。长期稳定性和电化学阻抗谱 (EIS) 表明，与其他制备的电极相比，Pd/PANI-MWCNTs-SnO2/Ti 电极具有最佳的乙醇氧化性能。因此，获得的结果表明，Pd/PANI-MWCNTs-SnO2/Ti 电极可以成为乙醇氧化反应的有希望的候选物，用于直接乙醇燃料电池。长期稳定性和电化学阻抗谱 (EIS) 表明，与其他制备的电极相比，Pd/PANI-MWCNTs-SnO2/Ti 电极具有最佳的乙醇氧化性能。因此，获得的结果表明，Pd/PANI-MWCNTs-SnO2/Ti 电极可以成为乙醇氧化反应的有希望的候选物，用于直接乙醇燃料电池。