High-efficiency encapsulation of Pt nanoparticles into the channel of carbon nanotubes as an enhanced electrocatalyst for methanol oxidation.
High-efficiency encapsulation of Pt nanoparticles into the channel of carbon nanotubes as an enhanced electrocatalyst for methanol oxidation.
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DOI：
10.1002/chem.201302416
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发表时间：
2013-11
期刊：
影响因子：
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通讯作者：
Jianan Zhang;Shaojun Guo;Junyi Wei;Qun Xu;Wenfu Yan;Jianwei Fu;Shoupei Wang;Min Cao;Zhimin Chen-Zh
中科院分区：
文献类型：
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作者：
Jianan Zhang;Shaojun Guo;Junyi Wei;Qun Xu;Wenfu Yan;Jianwei Fu;Shoupei Wang;Min Cao;Zhimin Chen-Zh
铂基纳米结构作为甲醇氧化反应（莫尔）的阳极催化剂已经被广泛研究了很多年。然而，具有挑战性的问题，如不良的反应动力学和莫尔的短期稳定性是此类催化剂的主要缺点，并限制了它们的应用。在此，我们开发了一种简便的方法来封装Pt纳米颗粒（NPs）内的多孔碳纳米管（CNT; Pt-in-CNTs）的纳米通道作为一种新的增强型电催化材料。所制备的碳纳米管同时提供了有序的离子扩散通道和约束效应的纳米粒子，这既有利于促进催化动力学和避免奥斯特瓦尔德熟化的Pt纳米粒子，从而导致高活性和持久的循环寿命作为阳极催化剂的莫尔。本工作为通过优化催化剂的结构来提高催化剂的稳定性和活性提供了一种新的途径，并且Pt-in-CNTs代表了迄今为止报道的用于莫尔还原的最耐用的催化剂。
Pt-based nanostructures serving as anode catalysts for the methanol oxidation reaction (MOR) have been widely studied for many years. Nevertheless, challenging issues such as poor reaction kinetics and the short-term stability of the MOR are the main drawbacks of such catalysts and limit their applications. Herein, we have developed a facile approach to encapsulate Pt nanoparticles (NPs) inside the nanochannels of porous carbon nanotubes (CNTs; Pt-in-CNTs) as a new enhanced electrocatalytic material. The as-prepared CNTs offer simultaneously ordered diffusion channels for ions and a confinement effect for the NPs, which both facilitate the promotion of catalytic kinetics and avoid the Ostwald ripening of Pt NPs, thus leading to high activity and durable cycle life as an anode catalyst for MOR. This work provides a new approach for enhancing the stability and activity by optimizing the structure of the catalyst, and the Pt-in-CNTs represent the most durable catalysts ever reported for MOR.