作者
Joshua Snyder, Ian McCue, Ken Livi, Jonah Erlebacher
发表日期
2012/5/23
期刊
Journal of the American Chemical Society
卷号
134
期号
20
页码范围
8633-8645
出版商
American Chemical Society
简介
We present a comprehensive experimental study of the formation and activity of dealloyed nanoporous Ni/Pt alloy nanoparticles for the cathodic oxygen reduction reaction. By addressing the kinetics of nucleation during solvothermal synthesis we developed a method to control the size and composition of Ni/Pt alloy nanoparticles over a broad range while maintaining an adequate size distribution. Electrochemical dealloying of these size-controlled nanoparticles was used to explore conditions in which hierarchical nanoporosity within nanoparticles can evolve. Our results show that in order to evolve fully formed porosity, particles must have a minimum diameter of ∼15 nm, a result consistent with the surface kinetic processes occurring during dealloying. Nanoporous nanoparticles possess ligaments and voids with diameters of approximately 2 nm, high surface area/mass ratios usually associated with much smaller …
学术搜索中的文章
J Snyder, I McCue, K Livi, J Erlebacher - Journal of the American Chemical Society, 2012