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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Supercritical Deposition Route of Preparing Pt/Graphene Composites and Their Catalytic Performance toward Methanol Electrooxidation
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Supercritical Deposition Route of Preparing Pt/Graphene Composites and Their Catalytic Performance toward Methanol Electrooxidation

机译：Pt /石墨烯复合材料的超临界沉积路线及其对甲醇电氧化的催化性能

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摘要

The production of effective loading and direct deposition of Pt nanoparticles on graphene is difficult because this intriguing carbon material has highly hydrophobic surface properties. In this work, Pt/graphene sheet (GS) composites were successfully synthesized via a simple, effective, and environmentally benign one-pot supercritical carbon dioxide deposition route using dimethyl (1,5-cyclooctadiene) platinum(n) (PtMe2COD) as a soluble organometallic precursor. The preparation process obviates the need for solvents, which are often volatile and toxic. No post-treatment processes such as washing and drying are needed. Transmission electron microscopy shows that ultrafine metal nanoparticles with an average size as small as ~2 nm are densely and evenly decorated on the hydrophobic surfaces of GS at Pt loadings up to 80 wt %. Electrochemical studies reveal that the prepared Pt/ GS composites possess notably higher catalytic activity and better stability toward methanol electrooxidation in comparison with Pt/multiwalled carbon nanotube and Pt/carbon black composites. The supercritical carbon dioxide deposition method could be easily extended to the fabrication of other graphene-based metal composites with desirable properties by selecting suitable organometallic precursors.
机译：Pt纳米颗粒在石墨烯上的有效负载和直接沉积的生产非常困难，因为这种有趣的碳材料具有高度疏水的表面特性。在这项工作中，使用二甲基（1,5-环辛二烯）铂（n）（PtMe2COD）作为简单，有效且环境友好的一锅超临界二氧化碳沉积路线成功合成了Pt /石墨烯片（GS）复合材料。可溶性有机金属前体。制备过程消除了对溶剂的需求，溶剂通常是挥发性和有毒的。不需要后处理过程，例如洗涤和干燥。透射电子显微镜显示，平均粒径低至〜2 nm的超细金属纳米颗粒在pt含量高达80 wt％时，在GS的疏水表面上密集且均匀地装饰。电化学研究表明，与Pt /多壁碳纳米管和Pt /炭黑复合材料相比，制备的Pt / GS复合材料具有更高的催化活性和更好的抗甲醇电氧化稳定性。通过选择合适的有机金属前体，超临界二氧化碳沉积方法可以轻松扩展到具有所需性能的其他石墨烯基金属复合材料的制造。

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