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首页> 外文期刊>Electrocatalysis >3D pi-Conjugated Poly(amic) Acid Polymer as Support Matrices for Ethanol Electro-Oxidation on Palladium and Platinum Catalysts
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3D pi-Conjugated Poly(amic) Acid Polymer as Support Matrices for Ethanol Electro-Oxidation on Palladium and Platinum Catalysts

机译：3Dπ共轭聚（酰胺）酸聚合物作为载体在钯和铂催化剂上进行乙醇电氧化的载体

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摘要

The search for new catalyst support matrices to replace the conventional carbon black support has been an important research field for decades. Aromatic conducting polymer (ACP)-based matrices have been found as prospective candidates. Poly(amic) acid (PAA) is one such polymer. We hereby present the catalytic activity and stability of electrodeposited palladium (PdNPs) and platinum (PtNPs) nanoparticles stabilized with PAA. We fabricated four electrodes: Pd/GCE, PAA/Pd/GCE, Pt/GCE, and PAA/Pt/GCE. Cyclic voltammetry and chronoamperometry were employed to assess the ethanol oxidation reaction using PAA as support matrix. PAA was used as support to enhance the stability of PdNPs and PtNPs in basic and acidic media, respectively. The synthesized PAA was characterized using NMR and FTIR. Scanning electron microscopy and X-ray diffraction (XRD) were used for nanoparticle characterization. Test results revealed that the presence of PAA layer on the catalysts leads to sluggish electron transfer kinetics as deduced from higher forward and reverse current densities (5 and 11 mA/cm(2)) for PdNPs on glassy carbon (Pd/GCE) electrode compared to PAA-stabilized PdNPs (PAA/Pd/GCE) (0.6 and 1.2 mA/cm(2)), respectively. A similar trend was reported for PtNPs. However, in presence of PAA, both PtNPs and PdNPs were observed to provide stability at up to 900 and 150 cycles, respectively. Chronoamperometric results reinforced the catalyst stabilization effect of the polymer, with findings revealing that the steady-state current density of PAA/Pd/GCE was similar to 2.5 times higher than the bare Pd/GCE.
机译：几十年来，寻找新的催化剂载体基质来代替常规炭黑载体一直是重要的研究领域。已经发现基于芳香族导电聚合物（ACP）的基质是潜在的候选物。聚（酰胺）酸（PAA）是一种这样的聚合物。我们在此介绍了用PAA稳定的电沉积钯（PdNPs）和铂（PtNPs）纳米颗粒的催化活性和稳定性。我们制造了四个电极：Pd / GCE，PAA / Pd / GCE，Pt / GCE和PAA / Pt / GCE。循环伏安法和计时电流法用于评估以PAA为载体的乙醇氧化反应。 PAA分别用作增强PdNP和PtNP在碱性和酸性介质中稳定性的支持物。使用NMR和FTIR表征合成的PAA。扫描电子显微镜和X射线衍射（XRD）用于表征纳米颗粒。测试结果表明，在催化剂上存在PAA层会导致电子传递动力学缓慢，这是由玻璃碳（Pd / GCE）电极上的PdNP的较高正向和反向电流密度（5和11 mA / cm（2））推导得出的到PAA稳定的PdNP（PAA / Pd / GCE）（0.6和1.2 mA / cm（2））。据报道，PtNPs也有类似趋势。但是，在存在PAA的情况下，观察到PtNP和PdNP分别提供了高达900和150个循环的稳定性。计时安培法的结果增强了聚合物的催化剂稳定作用，发现表明PAA / Pd / GCE的稳态电流密度约为裸Pd / GCE的2.5倍。

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