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首页> 外文期刊>RSC Advances >Electrocatalytic reduction of oxygen at platinum nanoparticles dispersed on electrochemically reduced graphene oxide/PEDOT:PSS composites
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Electrocatalytic reduction of oxygen at platinum nanoparticles dispersed on electrochemically reduced graphene oxide/PEDOT:PSS composites

机译：分散在电化学还原石墨烯氧化物/转型上的铂纳米粒子的电催化还原氧气：PSS复合材料

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摘要

Composites of commercially available graphene oxide (GO) and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) with solvent additive ethylene glycol (EG) were investigated as an alternative support for Pt nanoparticles towards the electrocatalytic reduction of oxygen. The surface characteristics of the materials were examined using atomic force microscopy (AFM), X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and energy dispersive X-ray spectroscopy (EDS). Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) at rotating disk electrodes (RDEs) and rotating ring-disk electrodes (RRDEs) were used to characterise the electrocatalytic activities of the composites materials. The structural and electrochemical studies reveal that the addition of EG favours the homogeneous distribution of Pt particles with reduced particle size and improves the electrocatalytic properties. A 30% and 16% increase in electrochemically active surface area (ECSA), a 1.2 and 1.1 fold increase in specific area activity (SA), and a 1.5 and 1.2 fold increase in mass activity (MA) were observed for 30% and 40% Pt loading on PEDOT:PSS after the addition of EG. A composite of rGO and PEDOT:PSS(EG) was investigated for different (w/w) ratios of PEDOT:PSS and rGO. The 1 : 2 w/w ratio showed an enhanced catalytic activity with high limiting current, more positive onset potential, higher SA and MA with lower H(2)O(2)yield compared to PEDOT:PSS(EG) and rGO and previously reported values for PEDOT:PSS.
机译：商业上可获得的石墨烯（GO）和聚（3,4-亚乙二氧基噻吩）：聚（苯乙烯磺酸盐）（PEDOT）（PEDOT：PSS）与溶剂添加剂乙二醇（例如）作为PT纳米颗粒朝向电催化还原的替代载体进行研究氧。使用原子力显微镜（AFM），X射线衍射（XRD），现场排放扫描电子显微镜（FESEM）和能量分散X射线光谱（EDS）来检查材料的表面特征。循环伏安法（CV）和线性扫描伏安法（LSV）用于旋转盘电极（RDE）和旋转环形盘电极（RRDE）来表征复合材料材料的电催化活性。结构和电化学研究表明，添加了例如Pt颗粒的均匀分布，粒径降低并改善了电催化性质。电化学活性表面积（ECSA）增加30％和16％，比例的面积活性（SA）增加，1.5和1.2倍，并观察到大规模活性（MA）的1.5％和1.2倍以下，持续30％和40 PEDOT上的％PT加载：添加后PSS。 RGO和PEDOT的复合材料：针对PEDOT的不同（W / W）比例进行了PSS（例如）：PSS和RGO。 1：2 W / W的比率显示出具有高限制电流，更高的阳性发作潜力，更高的SA和具有较低的H（2）O（2）产率的高限制电流，更高的SA和MA的催化活性，与PEDOT：PSS（例如）和RGO和先前相比报告PEDOT的值：PSS。

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  • 来源
    《RSC Advances》 |2020年第51期|共10页
  • 作者

    Getachew Teklewold; Addis Fitsum; Mehretie Solomon; Yip Hin-Lap; Xia Ruidong; Admassie Shimelis;

  • 作者单位

    Addis Ababa Univ Dept Chem PBox 1176 Addis Ababa Ethiopia;

    Addis Ababa Univ Dept Chem PBox 1176 Addis Ababa Ethiopia;

    Addis Ababa Univ Dept Chem PBox 1176 Addis Ababa Ethiopia;

    South China Univ Technol Sch Mat Sci &

    Engn Inst Polymer Optoelect Mat &

    Devices State Key Lab Luminescent Mat &

    Devices 381 Wushan Rd Guangzhou 510640 Peoples R China;

    South China Univ Technol Sch Mat Sci &

    Engn Inst Polymer Optoelect Mat &

    Devices State Key Lab Luminescent Mat &

    Devices 381 Wushan Rd Guangzhou 510640 Peoples R China;

    Addis Ababa Univ Dept Chem PBox 1176 Addis Ababa Ethiopia;

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