Enhanced activity, durability and anti-poisoning property of Pt/W18O49 for methanol oxidation with a sub-stoichiometric tungsten oxide W18O49 support
Enhanced activity, durability and anti-poisoning property of Pt/W18O49 for methanol oxidation with a sub-stoichiometric tungsten oxide W18O49 support
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亚化学计量氧化钨 W18O49 载体增强了 Pt/W18O49 甲醇氧化活性、耐久性和抗中毒性能
DOI：
10.1039/c4ta04220d
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发表时间：
2014-11
影响因子：
11.9
通讯作者：
Chunwen Sun
中科院分区：
文献类型：
--
作者：
Fan Li;Hongyu Gong;Yan Wang;Hui Zhang;Yizhi Wang;Shengnan Liu;Shuo Wang;Chunwen Sun
在这项工作中，亚化学计量的氧化钨W18 O 49首次研究作为Pt催化剂的载体。具有各向同性形貌的金属单斜W18 O 49纳米棒（NRs）不仅可以改善电子、反应物和产物的传输，而且还可以提高Pt在甲醇氧化反应（莫尔）中的利用率。Pt/W18 O 49的正向峰（If）的比活度被确定为1.14 mA cmPt−2，这分别是Pt黑和Pt/C的约1.4倍和1.8倍。另一方面，稳健的W18 O 49 NR提高了Pt/W18 O 49的稳定性。在5000次循环加速耐久性试验后，Pt/W18 O 49的电化学表面积（ECSA）损失率仅为27.12%，低于Pt黑和Pt/C。此外，在W_（18）O_（49）中还存在大量的氧空位和W的两种价态（W ~（5+）和W ~（6+）），这可能会促进氢溢出和氧缓冲。这些作用共同提高了Pt/W_（18）O_（49）对莫尔还原中间体的抗中毒性能。Pt/W_（18）O_（49）、Pt黑和Pt/C的正向与反向反应的峰电流比（If/Ib）分别为1.12、0.99和0.79。结果表明，Magneli相W_（18）O_（49）是一种很有前途的莫尔还原催化剂载体。
In this work, sub-stoichiometric tungsten oxide W18O49 was first studied as a support for a Pt catalyst. Metallic monoclinic W18O49 nanorods (NRs) with an isotropic morphology can not only improve electron, reactant, and product transport but can also enhance the utilisation of Pt for the methanol oxidation reaction (MOR). The specific activity for the forward peak (If) of Pt/W18O49 was determined to be 1.14 mA cmPt−2, which is approximately 1.4 and 1.8 times higher than that of Pt-black and Pt/C, respectively. On the other hand, the robust W18O49 NRs improve the stability of Pt/W18O49. After a 5000-cycle accelerated durability test, the electrochemical surface area (ECSA) loss rate of Pt/W18O49 was only 27.12%, less than that of Pt-black and Pt/C. Moreover, numerous oxygen vacancies and two valence states of W (W5+ and W6+) were found to co-exist in W18O49, which may promote hydrogen spillover and oxygen buffering. These effects together contributed to improve the anti-poisoning properties of Pt/W18O49 towards the intermediates in the MOR. The peak current ratio of the forward versus the backward (If/Ib) reaction is 1.12 for Pt/W18O49, 0.99 for Pt-black, and 0.79 for Pt/C. It was found that the Magneli phase W18O49 may be a promising catalyst support for use in the MOR.
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影响因子：
11.9
作者：
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