Effects of multiwalled carbon nanotube morphology on the synthesis and electrocatalytic performance of Pt supported by multiwalled carbon nanotubes
Effects of multiwalled carbon nanotube morphology on the synthesis and electrocatalytic performance of Pt supported by multiwalled carbon nanotubes
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DOI：
10.1016/j.apcatb.2013.11.043
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发表时间：
2014-05
影响因子：
22.1
通讯作者：
A. O. Al-Youbi;J. D. L. Fuente;F. Pérez-Alonso;A. Obaid;J. Fierro;M. Peña;M. A. Salam;S. Rojas
中科院分区：
文献类型：
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作者：
A. O. Al-Youbi;J. D. L. Fuente;F. Pérez-Alonso;A. Obaid;J. Fierro;M. Peña;M. A. Salam;S. Rojas
研究了多壁碳纳米管(CNTs)直径对碳纳米管负载铂(Pt/CNT)合成的影响。在酸性介质中对平均直径分别为10、20和60 nm的三种不同的碳纳米管进行化学处理，并将其作为铂纳米粒子的载体。在化学处理过程中，碳纳米管的比表面积和表面改性程度等特征受到碳纳米管直径的强烈影响。这些特征是决定固定在纳米管上的铂颗粒的大小和负载的关键方面。因此，使用直径较小的纳米管制备的催化剂具有较高的铂负载量和分散性。因此，在酸性介质中，催化剂在CO电氧化和氧还原反应中的性能随碳纳米管直径的不同而不同。值得注意的是，直径为60 nm的碳纳米管制备的催化剂在长期使用中最稳定。这种较高的稳定性是由于较大的铂颗粒具有更好的稳定性，以及铂在表面含氧量较高的碳纳米管上的锚定能力更强。随着碳纳米管直径的增大，基团的数量也增加。
The effect of the diameter of multiwalled carbon nanotubes (CNTs) during the synthesis of CNT-supported Pt (Pt/CNT) has been studied. Three different CNTs with mean diameters of 10, 20 and 60 nm were chemically treated in acidic media and used as supports for Pt nanoparticles. Features such as specific surface area and the degree of surface modification during the chemical treatment are strongly influenced by the diameter of the CNT. Those features are key aspects that determine the size and loading of the Pt particles immobilized onto the nanotubes. Therefore, the catalysts prepared using nanotubes with smaller diameters exhibit both higher Pt loading and dispersion. Consequently, the performance of the catalysts during the electrooxidation of CO and oxygen reduction reaction in acidic media varies with the diameter of the CNTs. Remarkably, the catalyst prepared on 60-nm diameter CNTs is the most stable during long-term use. This higher stability arises from both the superior stability of the larger Pt particles and the stronger anchorage of the Pt onto the CNTs with higher amounts of surface oxygen groups. The groups increase in number with increased CNT diameters.