Highly graphitic carbon black-supported platinum nanoparticle catalyst and its enhanced electrocatalytic activity for the oxygen reduction reaction in acidic medium

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• 作者：Haijing Liu¹ ; Jin Li¹ ; Xinhua Xu ; Feng Wang ; ^{wangf@mail.buct.edu.cn} ; Jingjun Liu ; Zhilin Li ; Jing Ji
• 关键词：Carbon black ; Graphitization ; Platinum ; Electrocatalyst ; Oxygen reduction reaction
• 刊名：Electrochimica Acta
• 出版年：2013
• 出版时间：30 March, 2013
• 年：2013
• 卷：93
• 期：Complete
• 页码：25-31
• 全文大小：1516 K

文摘

Highly graphitic carbon black (GCB) was synthesized by heat-treating commercial carbon black (CB, Vulcan XC-72) at 2800 ¡ãC. The resulting GCB with a high degree of graphitization was analyzed by X-ray diffraction patterns (XRD), Raman spectroscopy and high-resolution transmission electron microscopy (HR-TEM) and was then used as the support material for synthesizing a platinum-GCB (Pt/GCB) hybrid catalyst. This catalyst was obtained through a simple chemical reduction using ethylene glycol as the reducing agent, which is amenable to large-scale production. The results show that the Pt nanoparticles are highly dispersed on the GCB with an average diameter of 3.6 nm and a narrow particle size distribution. The electrochemical results obtained using cyclic voltammetry (CV), linear sweep voltammetry (LSV) utilizing a rotating disk electrode (RDE) and electrochemical impedance spectroscopy (EIS) show that the Pt/GCB electrocatalyst exhibits higher conductivity, stability, and electrocatalytic activity for the oxygen reduction reaction. The ORR proceeds through a four-electron process and when compared with Pt nanoparticles supported on Vulcan XC-72 (Pt/Vulcan XC-72) prepared under the same conditions, the Pt/GCB exhibits a significant enhancement for the ORR reaction.