Enhanced Stability of Immobilized Platinum Nanoparticles
through Nitrogen Heteroatoms on Doped Carbon Supports
Wen Shi
Kuang-Hsu Wu
Junyuan Xu
Qiang Zhang
Bingsen Zhang
Dang Sheng Su
10.1021/acs.chemmater.7b02658.s001
https://acs.figshare.com/articles/journal_contribution/Enhanced_Stability_of_Immobilized_Platinum_Nanoparticles_through_Nitrogen_Heteroatoms_on_Doped_Carbon_Supports/5493034
Catalysts in the
form of dispersed platinum nanoparticles (Pt NPs)
immobilized on carbon usually suffer from deactivation through sintering
under reaction conditions. In this contribution, we report the enhanced
stability of highly dispersed Pt NPs on surface-modified carbon nanotubes
(CNTs) against thermal and electrochemical sintering by N heteroatoms
in the N-doped carbon support. The improved antisintering property
of Pt NPs under thermal condition is characterized by <i>in situ</i> transmission electron microscopy (TEM), while the stability in electrochemical
methanol oxidation reaction (MOR) is further examined at <i>identical
location</i> (IL) using an advanced IL-TEM technique. A correlation
of the Pt NP growth with the electrochemical surface area (ECSA) and
the mass activity in MOR has been inferred. Our results indicate that
both the surface oxygen groups and nitrogen-doped species are responsible
for the fine dispersion of Pt NPs on the surface-modified CNTs, while
the Pt NPs can be effectively stabilized under thermal and electrochemical
conditions through the strong metal–support interaction <i>via</i> N heteroatoms. We further reveal that the mass activity
of Pt NP is closely associated with the ECSA rather than directly
affected by N-doping to CNTs.
2017-09-21 00:00:00
IL-TEM
electrochemical methanol oxidation reaction
N-doped carbon support
mass activity
ECSA
electrochemical surface area
MOR
surface oxygen groups
TEM
Pt NPs
transmission electron microscopy
N heteroatoms
Pt NP growth
surface-modified carbon nanotubes
CNT
IL
Immobilized Platinum Nanoparticles