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首页> 外文期刊>Chemistry: A European journal >Silver and gold icosahedra: One-pot water-based synthesis and their superior performance in the electrocatalysis for oxygen reduction reactions in alkaline media
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Silver and gold icosahedra: One-pot water-based synthesis and their superior performance in the electrocatalysis for oxygen reduction reactions in alkaline media

机译：银和金二十面体：一锅水基合成及其在碱性介质中电催化氧还原反应中的优异性能

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Much effort has gone into generating polyhedral noble metal nanostructures because of their superior electrocatalytic activities for fuel cells. Herein, we report uniform, high-yield icosahedral silver and gold nanoparticles by using a facile one-pot, seedless, water-based approach that incorporates polyvinyl pyrrolidone and ammonia. Electrocatalysis of the oxygen-reduction reaction was carried out in alkaline media to evaluate the performance of the icosahedral nanoparticles. They showed excellent stability and much higher electrocatalytic activity than the spherelike nanoparticles; they display a positive shift in reduction peak potential for O_2 of 0.14 and 0.05V, while the reduction peak currents of the silver and gold icosahedra are 1.5- and 1.6-fold, respectively, better than the spherelike nanoparticles. More importantly, the icosahedral nanoparticles display electrocatalytic activities comparable with commercial Pt/C electrocatalysts. The facile preparation of icosahedral silver and gold nanoparticles and their superior performance in the oxygen reduction reaction render them attractive replacements for Pt as cathode electrocatalysts in alkaline fuel cells. One-pot wonders: Silver and gold icosahedra are fabricated in high yield in a facile, one-pot, seedless, water-based reaction. The icosahedra (see figure) show electrocatalytic activities that approach those of commercial Pt/C electrocatalysts-in some ways exceeding them-which makes them attractive replacements for Pt as cathode electrocatalysts in alkaline fuel cells.
机译：由于多面体贵金属纳米结构对燃料电池的优越的电催化活性，因此已经做出了很多努力。在本文中，我们报告了通过使用结合了聚乙烯吡咯烷酮和氨的简便的一锅，无罐，水基方法，制备出均匀，高产率的二十面体银和金纳米颗粒。在碱性介质中进行氧还原反应的电催化，以评估二十面体纳米粒子的性能。与球形纳米颗粒相比，它们具有出色的稳定性和更高的电催化活性。它们显示出O_2的还原峰电位为0.14和0.05V的正位移，而银和二十面体金的还原峰电流分别比球形纳米颗粒好1.5倍和1.6倍。更重要的是，二十面体纳米颗粒显示出与市售Pt / C电催化剂相当的电催化活性。二十面体银和金纳米颗粒的简便制备及其在氧还原反应中的优异性能使其成为Pt作为碱性燃料电池中阴极电催化剂的有吸引力的替代品。一锅奇观：通过简单，一锅，无籽，水基反应，高产量地制造了银和金二十面体。二十面体（见图）显示出接近商业Pt / C电催化剂的电催化活性（在某些方面超过了它们），这使其成为碱性燃料电池中作为阴极电催化剂Pt的有吸引力的替代品。

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