Open AccessUltrafine jagged platinum nanowires enable ultrahigh mass activity for the oxygen reduction reaction
Author(s) -
Mufan Li,
Zipeng Zhao,
Tao Cheng,
Alessandro Fortunelli,
ChihYen Chen,
Rong Yu,
Qinghua Zhang,
Lin Gu,
Boris V. Merinov,
Zhaoyang Lin,
Enbo Zhu,
Ted H. Yu,
Qingying Jia,
Jinghua Guo,
Liang Zhang,
William A. Goddard,
Yu Huang,
Xiangfeng Duan
Publication year - 2016
Publication title -
science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 12.556
H-Index - 1186
eISSN - 1095-9203
pISSN - 0036-8075
DOI - 10.1126/science.aaf9050
Subject(s) - nanowire , platinum , non blocking i/o , electrochemistry , annealing (glass) , nanotechnology , materials science , electrode , chemical engineering , chemistry , catalysis , composite material , biochemistry , engineering
Improving the platinum (Pt) mass activity for the oxygen reduction reaction (ORR) requires optimization of both the specific activity and the electrochemically active surface area (ECSA). We found that solution-synthesized Pt/NiO core/shell nanowires can be converted into PtNi alloy nanowires through a thermal annealing process and then transformed into jagged Pt nanowires via electrochemical dealloying. The jagged nanowires exhibit an ECSA of 118 square meters per gram of Pt and a specific activity of 11.5 milliamperes per square centimeter for ORR (at 0.9 volts versus reversible hydrogen electrode), yielding a mass activity of 13.6 amperes per milligram of Pt, nearly double previously reported best values. Reactive molecular dynamics simulations suggest that highly stressed, undercoordinated rhombus-rich surface configurations of the jagged nanowires enhance ORR activity versus more relaxed surfaces.
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