10.1021/acscatal.8b01725.s002
Joohyuk Park
Joohyuk
Park
Manabu Shirai
Manabu
Shirai
Gwan Yeong Jung
Gwan Yeong
Jung
Sung O Park
Sung O
Park
Minjoon Park
Minjoon
Park
Jaechan Ryu
Jaechan
Ryu
Sang Kyu Kwak
Sang Kyu
Kwak
Jaephil Cho
Jaephil
Cho
Correlation of Low-Index
Facets to Active Sites in Micrometer-Sized Polyhedral Pyrochlore Electrocatalyst
American Chemical Society
2018
micrometer-sized polyhedral bismuth ruthenate pyrochlore
polyhedral structure
morphology
zinc oxide particles
batterie
first-principle calculations
Micrometer-Sized Polyhedral Pyrochlore Electrocatalyst Polyhedral structure
facets formation
transmission electron microscopy analysis
polyhedral metal oxides
formation mechanism
low-index facets
P-BRO
Active Sites
particle size
Zn
air electrode
bifunctional electrocatalysts
B-site cations
Low-Index Facets
2018-09-07 00:00:00
Media
https://acs.figshare.com/articles/media/Correlation_of_Low-Index_Facets_to_Active_Sites_in_Micrometer-Sized_Polyhedral_Pyrochlore_Electrocatalyst/7108538
Polyhedral structure
has attracted attention as a promising morphology of bifunctional
electrocatalysts, which is suitable for providing catalytic active
facets. However, polyhedral metal oxides have been suffering from
control of their morphology. Herein, we develop micrometer-sized polyhedral
bismuth ruthenate pyrochlore (P-BRO) for Zn–air batteries,
which achieve highly improved catalytic activity by development of
(100), (110), and (111) planes regardless of particle size. To clarify
the formation mechanism of polyhedral structure, in situ transmission
electron microscopy analysis is performed at 1050 °C, resulting
in observation of Ostwald ripening and facets formation. Furthermore,
we reveal that A- and B-site cations on low-index facets of the P-BRO
could mainly contribute to catalytic activity by first-principle calculations.
For practical application, we performed Zn–air flow batteries,
which could effectively remove precipitated zinc oxide particles on
the surface of air electrode, resulting in significantly increased
zinc utilization (≈50%) on discharging.