Hassan K M, Hathoot A A, Maher R, Abdel Azzem M
Electrochemistry Research Laboratory, Physics and Mathematics Engineering Department, Faculty of Electronic Engineering, Menoufia University Egypt
Electrochemistry Laboratory, Chemistry Department, Faculty of Science, Menoufia University Egypt.
RSC Adv. 2018 Apr 24;8(28):15417-15426. doi: 10.1039/c7ra13694c. eCollection 2018 Apr 23.
An ethanol oxidation reaction (EOR) in alkaline medium was carried out at palladium (Pd) or platinum (Pt) nanoparticles/poly 1,8-diaminonaphthalene (p1,8-DAN) composite catalyst electrodes. Pd and Pt were incorporated onto a p1,8-DAN/GC electrode by a cyclic voltammetry (CV) strategy. The obtained Pd/p1,8-DAN/GC, Pt/p1,8-DAN/GC, Pt/Pd/p1,8-DAN/GC and Pd/Pt/p1,8-DAN/GC modified electrodes were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and cyclic voltammetry (CV) techniques. Electrode surface areas (ESAs) of the obtained catalysts were calculated by carbon monoxide (CO) adsorption using differential electrochemical mass spectroscopy (DEMS). The electrocatalytic oxidation of ethanol (EtOH) at the catalyst electrodes was considered in 0.5 M NaOH solutions by CV and chronoamperometric techniques. The catalyst electrodes significantly enhanced the catalytic efficiency for EOR compared to a bare glassy carbon (GC) electrode. Bimetallic catalyst electrodes demonstrate improved catalytic activity, superior durability and higher tolerance to (CO) poison generated in the development of EOR compared with Pd/p1,8-DAN and Pt/p1,8-DAN catalysts, giving priority to Pt/Pd/p1,8-DAN/GC electrodes. Viability parameters, such as NaOH and EtOH concentrations, scan rate and upper potential limits, were examined and analyzed. This study suggests that the prepared catalysts have pronounced potential applications in direct EOR in fuel cells.
在钯（Pd）或铂（Pt）纳米颗粒/聚1,8 - 二氨基萘（p1,8 - DAN）复合催化剂电极上进行了碱性介质中的乙醇氧化反应（EOR）。通过循环伏安法（CV）策略将Pd和Pt掺入p1,8 - DAN/玻碳（GC）电极中。采用扫描电子显微镜（SEM）、能量色散X射线光谱（EDX）和循环伏安法（CV）技术对所得的Pd/p1,8 - DAN/GC、Pt/p1,8 - DAN/GC、Pt/Pd/p1,8 - DAN/GC和Pd/Pt/p1,8 - DAN/GC修饰电极进行了表征。使用差分电化学质谱（DEMS）通过一氧化碳（CO）吸附计算所得催化剂的电极表面积（ESA）。通过CV和计时电流法技术研究了在0.5 M NaOH溶液中催化剂电极上乙醇（EtOH）的电催化氧化。与裸玻碳（GC）电极相比，催化剂电极显著提高了EOR的催化效率。与Pd/p1,8 - DAN和Pt/p1,8 - DAN催化剂相比，双金属催化剂电极在EOR过程中表现出更高的催化活性、更好的耐久性和对产生的（CO）中毒更高的耐受性，其中Pt/Pd/p1,8 - DAN/GC电极表现最佳。研究了诸如NaOH和EtOH浓度、扫描速率和上限电位等活性参数并进行了分析。本研究表明，所制备的催化剂在燃料电池直接EOR中具有显著的潜在应用。
