Electrocatalytic Acitivity of rGO/PEDOT : PSS Nanocomposite towards Methanol Oxidation in Alkaline Media,Electroanalysis

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Electrocatalytic Acitivity of rGO/PEDOT : PSS Nanocomposite towards Methanol Oxidation in Alkaline Media
Electroanalysis ( IF 2.7 ) Pub Date : 2018-06-07 , DOI: 10.1002/elan.201800086
Bhagyalakhi Baruah ₁ , Ashok Kumar ₁

Affiliation

Increasing demand of alternative energy sources leads to the development of new electrocatalytic materials for fuel cells. In present work, we report the synthesis of rGO/PEDOT : PSS (reduced graphene oxide/ Poly (3,4‐ethylenedioxythiophene) : Polystyrene sulfonate) nanocomposite by in‐situ polymerization method using EDOT as precursor and the nanocomposite is used as anode catalyst for methanol oxidation. Structural and chemical characterizations such as XRD, FTIR and Micro‐Raman confirm the formation of the nanocomposite. From TEM image, growth of nanofibrous PEDOT : PSS on rGO nanosheets is observed. Electrochemical characterizations of rGO/PEDOT : PSS/ITO electrode are performed by Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS) and Chronoamperometry (CA) measurements. Methanol oxidation reactions are performed in 0.5 M NaOH solution. The anodic current of the nanocomposite coated ITO is found be 37.5 mA at 0.59 V due to methanol electro‐oxidation and retentivity of the electrode is 92 % of initial scan after 800 cycles. The chronoamperometric results reveal that the nanocomposite modified electrode exhibits better stability with retention factor of 42.4 % up to 3000 seconds. The rGO/PEDOT : PSS/ITO electrode exhibits enhanced electrocatalytic activity towards methanol oxidation reaction due to larger surface area and excellent conductivity of rGO nanosheet.

中文翻译：

rGO / PEDOT：PSS纳米复合材料对碱性介质中甲醇氧化的电催化活性

对替代能源的需求不断增长，导致了用于燃料电池的新型电催化材料的开发。在目前的工作中，我们报告了原位合成rGO / PEDOT：PSS（还原的氧化石墨烯/聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐）纳米复合材料的合成以EDOT为前驱体，以纳米复合材料为原料的聚合反应方法，用作甲醇氧化的阳极催化剂。XRD，FTIR和Micro-Raman等结构和化学特征证实了纳米复合材料的形成。从TEM图像，观察到rGO纳米片上纳米纤维PEDOT：PSS的生长。rGO / PEDOT：PSS / ITO电极的电化学表征通过循环伏安法（CV），电化学阻抗谱（EIS）和计时电流法（CA）进行。甲醇氧化反应在0.5 M NaOH溶液中进行。由于甲醇的电氧化作用，纳米复合材料涂覆的ITO在0.59 V时的阳极电流为37.5 mA，在800个循环后，电极的保持率为初始扫描的92％。计时电流法结果表明，纳米复合材料修饰的电极表现出更好的稳定性，在3000秒内的保留率为42.4％。rGO / PEDOT：PSS / ITO电极由于rGO纳米片的较大表面积和优异的电导率而表现出增强的对甲醇氧化反应的电催化活性。

更新日期：2018-06-07

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