室温氢敏Pt- sno2复合纳米陶瓷:两种不同方式负载Pt纳米催化剂的作用对比

Jieting Zhao, Jiannan Song, Xilai Lu, Menghan Wu, Zhiqiao Yan, Feng Chen, Wanping Chen
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引用次数: 1

摘要

可溶性贵金属盐作为纳米催化剂被广泛用于装载贵金属。本文以SnO2纳米粒子和H2PtCl6为原料,分别采用两种Pt加载方法制备了Pt-SnO2复合纳米陶瓷:溶液还原法是将H2PtCl6溶液加入SnO2和锌粉的悬浮液中,在SnO2纳米粒子上形成Pt;浸渍法是在烧结过程中由H2PtCl6形成Pt。虽然两种Pt加载方法制备的样品在室温下都表现出固体响应,但溶液还原法制备的样品表现出更好的室温氢传感特性。对于Pt含量为0.5 wt%、烧结温度为825℃的两个试样,溶液还原法制备试样的响应值为9700 ~ 1% H2-20% O2-N2,远远大于浸渍法制备试样的响应值145。通过XRD、FESEM、EDS、TEM和HRTEM表征了两种Pt加载方法制备的样品具有相似的微观结构。但分析表明,浸渍法的余氯含量高于溶液还原法。本文认为,两种不同Pt加载方法制备的样品在室温氢传感特性上的显著差异是由其不同的除氯工艺造成的。这项研究表明,在许多应用中,从可溶性盐中负载贵金属作为纳米催化剂的适当方法的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Room-Temperature Hydrogen-Sensitive Pt-SnO2 Composite Nanoceramics: Contrasting Roles of Pt Nano-Catalysts Loaded via Two Different Methods
Soluble noble metal salts are widely used for loading noble metals as nano-catalysts in many applications. In this paper, Pt-SnO2 composite nanoceramics were prepared from SnO2 nanoparticles and H2PtCl6 using two Pt loading methods separately: for the solution reduction method, a H2PtCl6 solution was added to a suspension of SnO2 and zinc powder to form Pt on SnO2 nanoparticles, and for the impregnation method, Pt was formed from H2PtCl6 in the course of sintering. Although a series of samples prepared using both Pt loading methods showed a solid response to H2 at room temperature, the ones prepared using the solution reduction method exhibited much better room-temperature hydrogen-sensing characteristics. For two samples of 0.5 wt% Pt and sintered at 825 °C, the response value for the sample prepared using the solution reduction method was 9700 to 1% H2–20% O2-N2, which was much larger than the value of 145 for the sample prepared using the impregnation method. Samples prepared using the two Pt loading methods have similar microstructures characterized via XRD, FESEM, EDS, TEM, and HRTEM. However, the residual chlorine content in those using the impregnation method was higher than those using the solution reduction method according to the analysis. It is proposed that the striking difference in room-temperature hydrogen sensing characteristics among samples prepared using these two different Pt loading methods separately resulted from their different chlorine removal processes. This study demonstrates the importance of a proper method for loading noble metals from their soluble salts as nano-catalysts in many applications.
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