Active and stable platinum/ionic liquid/carbon nanotube electrocatalysts for oxidation of methanol

ScienceOpen research Pub Date : 2015-07-29 DOI:10.14293/S2199-1006.1.SOR-CHEM.AYZQJS.V2

Huan‐Tsung Chang, Z. Shih, A. Periasamy, Guan-Lin Lin

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Abstract

Abstract Platinum (Pt) nanoparticles (NPs) on carbon nanotubes (CNTs) have been prepared from PtCl62− ions through a facile ionic liquid (IL)-assisted method and used for methanol oxidation. 1-Butyl-3-methylimidazolium (BMIM) with four different counter ions (PF6−, Cl−, Br−, and I−) has been tested for the preparation of Pt/IL/CNT nanohybrids, showing the counter ions of ILs play an important role in the formation of small sizes of Pt NPs. Only [BMIM][PF6] and [BMIM][Cl] allow reproducible preparation of Pt/IL/CNT nanohybrids. The electroactive surface areas of Pt/[BMIM][PF6]/CNT, Pt/[BMIM][Cl]/CNT, Pt/CNT, and commercial Pt/C electrodes are 62.8, 101.5, 78.3, and 87.4 m2 g−1, respectively. The Pt/[BMIM][Cl]/CNT nanohybrid-modified electrodes provide higher catalytic activity (251.0 A g−1) at a negative onset potential of −0.60 V than commercial Pt/C-modified ones do (133.5 A g−1) at −0.46 V. The Pt/[BMIM][Cl]/CNT electrode provides the highest ratio (4.52) of forward/reverse oxidation current peak, revealing a little accumulation of carbonaceous residues.

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活性稳定的铂/离子液体/碳纳米管甲醇氧化电催化剂

摘要采用易溶离子液体(IL)辅助法制备了碳纳米管(CNTs)上的铂(Pt)纳米粒子(NPs)，并用于甲醇氧化。用四种不同的反离子(PF6−、Cl−、Br−和I−)对1-丁基-3-甲基咪唑(BMIM)进行了制备Pt/IL/CNT纳米杂化物的实验，结果表明，IL的反离子在小尺寸Pt NPs的形成中起着重要作用。只有[BMIM][PF6]和[BMIM][Cl]可以重复制备Pt/IL/CNT纳米杂化物。Pt/[BMIM][PF6]/CNT、Pt/[BMIM][Cl]/CNT、Pt/CNT和商用Pt/C电极的电活性表面积分别为62.8、101.5、78.3和87.4 m2 g−1。Pt/[BMIM][Cl]/CNT纳米杂化修饰电极在−0.60 V负电位下的催化活性(251.0 A g−1)高于商业Pt/ c修饰电极在−0.46 V的催化活性(133.5 A g−1)。Pt/[BMIM][Cl]/CNT电极提供了最高的正向/反向氧化电流峰值比(4.52)，显示出少量碳质残留物的积累。

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ScienceOpen research

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