4 years ago

Control of Architecture in Rhombic Dodecahedral Pt–Ni Nanoframe Electrocatalysts

Control of Architecture in Rhombic Dodecahedral Pt–Ni Nanoframe Electrocatalysts
Nigel Becknell, Vojislav R. Stamenkovic, Karren L. More, Brian T. Sneed, Zhiqiang Niu, Yi Yu, Dohyung Kim, Peidong Yang, Nenad M. Markovic, Yoonkook Son, Teng Lei, Dongguo Li
Platinum-based alloys are known to demonstrate advanced properties in electrochemical reactions that are relevant for proton exchange membrane fuel cells and electrolyzers. Further development of Pt alloy electrocatalysts relies on the design of architectures with highly active surfaces and optimized utilization of the expensive element, Pt. Here, we show that the three-dimensional Pt anisotropy of Pt–Ni rhombic dodecahedra can be tuned by controlling the ratio between Pt and Ni precursors such that either a completely hollow nanoframe or a new architecture, the excavated nanoframe, can be obtained. The excavated nanoframe showed ∼10 times higher specific and ∼6 times higher mass activity for the oxygen reduction reaction than Pt/C, and twice the mass activity of the hollow nanoframe. The high activity is attributed to enhanced Ni content in the near-surface region and the extended two-dimensional sheet structure within the nanoframe that minimizes the number of buried Pt sites.

Publisher URL: http://dx.doi.org/10.1021/jacs.7b05584

DOI: 10.1021/jacs.7b05584

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