Preparation and characterization of PtRu nanoparticles supported on nitrogen-doped porous carbon for electrooxidation of methanol.
Preparation and characterization of PtRu nanoparticles supported on nitrogen-doped porous carbon for electrooxidation of methanol.
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DOI：
10.1021/am2010515
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发表时间：
2011-09
影响因子：
9.5
通讯作者：
Zhaolin Liu;F. Su;Xinhui Zhang;S. Tay
中科院分区：
文献类型：
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作者：
Zhaolin Liu;F. Su;Xinhui Zhang;S. Tay
通过对聚吡咯纳米球（PNs）炭化制备的无孔碳纳米球（CNs）进行化学活化，制备了n掺杂多孔碳纳米球（PCNs）。采用乙二醇化学还原法制备了载于PCNs和Vulcan XC-72炭黑上的PtRu和Pt纳米颗粒催化剂。采用透射电子显微镜、x射线衍射和能量色散x射线光谱对样品进行表征。结果表明，含有N个官能团的pcn具有大量的微孔。Pt和PtRu颗粒均匀分散，粒径分布窄。采用循环伏安法、时安培法和电化学阻抗谱法（EIS）研究了常温下液体甲醇在这些催化剂上的电氧化反应。结果表明，Pt(1)Ru(1)/PCN合金催化剂具有最高的催化活性和较好的CO耐受性；PCN负载的PtRu纳米颗粒比炭黑XC-72负载的PtRu纳米颗粒具有更高的催化活性和更稳定的持续电流。与商业化的Alfa Aesar PtRu催化剂相比，Pt(1)Ru(1)/PCN在甲醇氧化中表现出更强的持久催化活性，这是因为PtRu小颗粒的高度分散和N种载体PCN的存在。
N-doped porous carbon nanospheres (PCNs) were prepared by chemical activation of nonporous carbon nanospheres (CNs), which were obtained via carbonization of polypyrrole nanospheres (PNs). The catalysts, PtRu and Pt nanoparticles supported on PCNs and Vulcan XC-72 carbon black, were prepared by ethylene glycol chemical reduction. Transmission electron microscopy, X-ray diffraction, and energy-dispersive X-ray spectroscopy were employed to characterize samples. It was found that PCNs containing N function groups possess a large number of micropores. Uniform and well-dispersed Pt and PtRu particles with narrow particle size distribution were observed. The electrooxidation of liquid methanol on these catalysts was investigated at room temperature by cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy (EIS). The results showed that alloy catalyst (Pt(1)Ru(1)/PCN) possessed the highest catalytic activity and better CO tolerance than the other PtRu and Pt-only catalysts; PtRu nanoparticles supported on PCN showed a higher catalytic activity and more stable sustained current than on carbon black XC-72. Compared to commercial Alfa Aesar PtRu catalyst, Pt(1)Ru(1)/PCN reveals an enhanced and durable catalytic activity in methanol oxidation because of the high dispersion of small PtRu nanoparticles and the presence of N species of support PCNs.