College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Anhui Laboratory of Molecular-Based Materials, Anhui Normal University, Wuhu, 241000, PR China.
Chemistry. 2011 Mar 14;17(12):3482-9. doi: 10.1002/chem.201002949. Epub 2011 Feb 23.
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 0.05 V, 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.
由于具有优越的燃料电池电催化活性，人们付出了大量努力来制备多面体形的贵金属纳米结构。在此，我们报告了一种通过简便的一锅法、无种子、基于水的方法，使用聚乙烯吡咯烷酮和氨来制备均匀高产的二十面体银和金纳米粒子。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。它们表现出优异的稳定性和比球形纳米粒子高得多的电催化活性；它们的还原峰电位（O(2)）正移 0.14 和 0.05 V，而银和金二十面体的还原峰电流分别比球形纳米粒子好 1.5- 和 1.6 倍。更重要的是，二十面体纳米粒子的电催化活性可与商业 Pt/C 电催化剂相媲美。二十面体银和金纳米粒子的简便制备及其在氧还原反应中的优越性能使它们成为碱性燃料电池中阴极电催化剂替代 Pt 的有吸引力的选择。
