Low Dimensional Platinum-Based Bimetallic Nanostructures
for Advanced Catalysis
Qi Shao
Pengtang Wang
Ting Zhu
Xiaoqing Huang
10.1021/acs.accounts.9b00262.s001
https://acs.figshare.com/articles/journal_contribution/Low_Dimensional_Platinum-Based_Bimetallic_Nanostructures_for_Advanced_Catalysis/9457769
ConspectusThe development of renewable energy storage
and conversion has
been greatly promoted by the achievements in platinum (Pt)-based catalysts,
which possess remarkable catalytic performance. However, the high
cost and limited resources of Pt have hindered the practical applications
and thus stimulated extensive efforts to achieve maximized catalytic
performance with minimized Pt content. Low dimensional Pt-based bimetallic
nanomaterials (such as nanoplates and nanowires) hold enormous potential
to realize this target owing to their special atomic arrangement and
electronic structures. Recent achievements reveal that strain engineering
(e.g., the compressive or tensile strain existing on the Pt skin),
surface engineering (e.g., high-index facets, Pt-rich surface, and
highly open structures), and interface engineering (e.g., composition-segregated
nanostructures) for such nanomaterials can readily lead to electronic
modification, more active sites, and strong synergistic effect, thus
opening up new avenues toward greatly enhanced catalytic performance.In this Account, we focus on recent advances in low dimensional
Pt-based bimetallic nanomaterials as promising catalysts with high
activity, long-term stability, and enhanced selectivity for both electrocatalysis
and heterogeneous reactions. We begin by illustrating the important
role of several strategies on optimizing the catalytic performance:
(1) regulated electronic structure by strain effect, (2) increased
active sites by surface modification, and (3) the optimized synergistic
effect by interfacial engineering. First of all, a difference in atomic
bonding strength can result in compressive or tensile force, leading
to downshift or upshift of the d-band center. Such effects can be
significantly amplified in low-dimensionally confined nanostructures,
producing optimized bonding strength for improved catalysis. Furthermore,
a high density of high-index facets and a Pt-rich surface in shape-controlled
nanostructures based on surface engineering provide further enhancement
due to the increased Pt atom utilization and optimal adsorption energy.
Finally, interfacial engineering of low dimensional Pt-based bimetallic
nanomaterials with high composition-segregation can facilitate the
catalytic process due to a strong synergetic effect, which effectively
tunes the electronic structure, modifies the coordination environment,
and prevents catalysts from serious aggregation. The rational design
of low dimensional Pt-based bimetallic nanomaterials with superior
catalytic properties based on strain, surface, and interface engineering
could help realize enhanced catalysis, gain deep understanding of
the structure–performance relationship, and expand access to
Pt-based materials for general communities of materials science, chemical
engineering, and catalysis in renewable energy research fields.
2019-08-09 20:29:43
Pt-based bimetallic nanomaterials
Pt-rich surface
e.g
Low Dimensional Platinum-Based Bimetallic Nanostructures
Advanced Catalysis ConspectusThe development
catalysi
catalyst
Pt atom utilization
energy research fields
strain
performance
interface engineering
nanostructure