Facile synthesis of platinum-copper aerogels for the oxygen reduction reaction

Zhiwei Chen, Yuxiang Liao, Shengli Chen
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引用次数: 6

Abstract

Although carbon-supported platinum (Pt/C) has been generally used as a catalyst for the oxygen reduction reaction (ORR) in fuel cells, its practical application is limited by the corrosion reaction of the carbon support. Therefore, it is essential to develop new self-supported catalysts for the ORR. Noble metal aerogels represent highly promising self-supported catalysts with large specific surface area and excellent electrocatalytic activity. Classic sol-gel processes for aerogel synthesis usually take days due to the slow gelation kinetics. Here, we report a straightforward strategy to synthesize platinum-copper (PtCu) aerogels by reducing the metal salt solution with an excess of sodium borohydride at room temperature. The PtCu aerogels are formed in a relatively short time of 1 h through a rapid nucleation mechanism. The obtained PtCu aerogels have a highly porous structure with an appreciable topological surface area of 33.0 m2/g and mainly exposed (111) facets, which are favorable for the ORR. Consequently, the PtCu aerogels exhibit excellent ORR activity with a mass activity of 369.4 mA/mgPt and a specific activity of 0.847 mA/cm2, which are 2.6 and 3.3 times greater than those of Pt/C, respectively. The PtCu aerogels show remarkable ORR catalysis among all the noble metal aerogels that have been reported. The porous morphology and outstanding electrocatalytic activities of the PtCu aerogels illustrate their promising applications in fuel cells.
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氧还原反应用铂铜气凝胶的简易合成
碳载体铂(Pt/C)作为燃料电池氧还原反应(ORR)的催化剂已得到广泛应用,但其实际应用受到碳载体腐蚀反应的限制。因此,开发新型的自支撑型ORR催化剂是十分必要的。贵金属气凝胶具有较大的比表面积和优异的电催化活性,是非常有前途的自持催化剂。由于凝胶动力学缓慢,气凝胶合成的经典溶胶-凝胶过程通常需要数天时间。在这里,我们报告了一种在室温下用过量的硼氢化钠还原金属盐溶液来合成铂铜(PtCu)气凝胶的简单策略。PtCu气凝胶通过快速成核机制在相对较短的1 h内形成。得到的PtCu气凝胶具有高孔隙结构,拓扑表面积为33.0 m2/g,主要是暴露(111)面,有利于ORR。结果表明,PtCu气凝胶具有较好的ORR活性,其质量活性为369.4 mA/mgPt,比活性为0.847 mA/cm2,分别是Pt/C气凝胶的2.6和3.3倍。PtCu气凝胶在已报道的贵金属气凝胶中表现出较好的ORR催化作用。PtCu气凝胶的多孔形态和优异的电催化活性表明其在燃料电池中的应用前景广阔。
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