Pt Nanoparticles Loaded on W18O49 Nanocables–rGO Nanocomposite as a Highly Active and Durable Catalyst for Methanol Electro-Oxidation
Pt Nanoparticles Loaded on W18O49 Nanocables–rGO Nanocomposite as a Highly Active and Durable Catalyst for Methanol Electro-Oxidation
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DOI：
10.1021/acsomega.8b02942
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发表时间：
2018-12
期刊：
影响因子：
4.1
通讯作者：
Yizhi Wang;Shuo Wang;Fan Li;Yan Wang;Huairuo Zhang;Chunwen Sun
中科院分区：
文献类型：
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作者：
Yizhi Wang;Shuo Wang;Fan Li;Yan Wang;Huairuo Zhang;Chunwen Sun
高效、耐用的电催化剂是直接甲醇燃料电池商业化的关键。本工作制备了由铂纳米颗粒、W18O49纳米颗粒和还原石墨烯氧化物组成的三维纳米复合材料(Pt/W18O49 NCS-rGO)作为甲醇氧化反应(MOR)的电催化剂。该催化剂是通过两步法制备的。采用溶剂热法制备了W18O49纳米玻璃和还原氧化石墨烯复合材料。然后，将铂纳米颗粒负载到W18O49纳米棒和还原的氧化石墨烯复合材料上，在常温下进行氢气还原。得到的催化剂具有特殊的三维结构，由二维纳米片、组装的一维纳米线和负载在其表面的纳米颗粒组成。在0.854.1MHClO4和0.5MCH3OH混合电解液中，正向阳极峰电流密度达到16 2 4 mA/mgPt，而氢电极电位可逆。对CO也表现出很强的抗毒作用。在耐久性测试中，铂/W18O49NCS-RGO催化剂的电流密度衰减了37%，而在0.7V时，铂/碳催化剂的电流密度从600V下降到3600 S，降幅为41%。由于铂纳米粒子与W18O49NCS之间强烈的金属-载体相互作用，所以对MoR具有高的活性，中间产物具有良好的防毒性，稳定性也很好。
Highly active and durable electrocatalysts are vital for commercialization of direct methanol fuel cells. In this work, a three-dimensional nanocomposite consisting of platinum nanoparticles, W18O49 nanocables, and reduced graphene oxide composite (Pt/W18O49 NCs–rGO) has been prepared as an electrocatalyst for methanol oxidation reaction (MOR). The catalyst is prepared through a two-step method. The W18O49 nanocables and the reduced graphene oxide composite are prepared by a solvothermal process. Then, Pt nanoparticles are loaded on the W18O49 nanocables and the reduced graphene oxide composite by a hydrogen reduction at ambient condition. The obtained catalyst has a special three-dimensional architecture consisting of two-dimensional nanosheets, assembled one-dimensional nanocables, and the loaded nanoparticles on their surface. The Pt/W18O49 NCs–rGO catalyst shows 1.56 time mass activities than the Pt/C, with the current density of the forward anodic peak reaching 1624 mA/mgPt at 0.854 V versus reversible hydrogen electrode potential in 0.1 M HClO4 and 0.5 M CH3OH mixed electrolyte. It also shows a strong antipoisoning property toward CO. For the durability testing, the current density of Pt/W18O49 NCs–rGO shows a 37% decay, whereas the current of Pt/C catalyst shows a 41% degradation from 600 to 3600 s at 0.7 V. The high activity toward MOR, good antipoisoning for intermediate products, and excellent stability are ascribed to strong metal–support interaction effects between the Pt nanoparticles and the W18O49 NCs.