Evolution of dendritic platinum nanosheets into ripening-resistant holey sheets.
Under electron-beam irradiation, dendritic platinum nanosheets structurally evolve into metastable "holey" nanosheets. Monte Carlo simulations of this structural transformation agree well with electron microscope images detailing the ripening process. The experiments and simulations show that nanoscale holes of a critical size are persistent and give holey sheets their morphological stability and sustained high surface area. Platinum nanostructures composed of these holey nanosheets exhibit improved durability in electrocatalytic reactions due to their remarkable ripening resistance.
Song
Yujiang
Y
Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, New Mexico 87185-1349, USA.
Hickner
Michael A
MA
Challa
Sivakumar R
SR
Dorin
Rachel M
RM
Garcia
Robert M
RM
Wang
Haorong
H
Jiang
Ying-Bing
YB
Li
Peng
P
Qiu
Yan
Y
van Swol
Frank
F
Medforth
Craig J
CJ
Miller
James E
JE
Nwoga
Tochi
T
Kawahara
Kazuo
K
Li
Wen
W
Shelnutt
John A
JA