10.1021/jacs.7b05584.s002
Nigel Becknell
Nigel
Becknell
Yoonkook Son
Yoonkook
Son
Dohyung Kim
Dohyung
Kim
Dongguo Li
Dongguo
Li
Yi Yu
Yi
Yu
Zhiqiang Niu
Zhiqiang
Niu
Teng Lei
Teng
Lei
Brian T. Sneed
Brian T.
Sneed
Karren L. More
Karren L.
More
Nenad M. Markovic
Nenad M.
Markovic
Vojislav R. Stamenkovic
Vojislav R.
Stamenkovic
Peidong Yang
Peidong
Yang
Control
of Architecture in Rhombic Dodecahedral Pt–Ni
Nanoframe Electrocatalysts
American Chemical Society
2017
oxygen reduction reaction
Pt alloy electrocatalysts
proton exchange membrane fuel cells
mass activity
nanoframe
2017-08-08 00:00:00
Media
https://acs.figshare.com/articles/media/Control_of_Architecture_in_Rhombic_Dodecahedral_Pt_Ni_Nanoframe_Electrocatalysts/5313616
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.