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Correlation of Low-Index Facets to Active Sites in Micrometer-Sized Polyhedral Pyrochlore Electrocatalyst
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posted on 2018-09-07, 00:00 authored by Joohyuk Park, Manabu Shirai, Gwan Yeong Jung, Sung O Park, Minjoon Park, Jaechan Ryu, Sang Kyu Kwak, Jaephil ChoPolyhedral 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.
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micrometer-sized polyhedral bismuth ruthenate pyrochlorepolyhedral structuremorphologyzinc oxide particlesbatteriefirst-principle calculationsMicrometer-Sized Polyhedral Pyrochlore Electrocatalyst Polyhedral structurefacets formationtransmission electron microscopy analysispolyhedral metal oxidesformation mechanismlow-index facetsP-BROActive Sitesparticle sizeZnair electrodebifunctional electrocatalystsB-site cationsLow-Index Facets
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