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Moon, Hoi Ri
Functional Inorganic Nanomaterials for Energy Lab (FINE)
Research Interests
  • Inorganic-organic hybrid materials, carbon capture materials, hydrogen storage materials, heterogeneous catalyst

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A transformative route to nanoporous manganese oxides of controlled oxidation states with identical textural properties

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Title
A transformative route to nanoporous manganese oxides of controlled oxidation states with identical textural properties
Author
Lee, Jae HwaSa, Young JinKim, Tae KyungMoon, Hoi RiJoo, Sang Hoon
Keywords
OXYGEN REDUCTION REACTION; METAL-ORGANIC FRAMEWORKS; NANOCRYSTALLINE FRAMEWORKS; ELECTROCATALYTIC ACTIVITY; THERMAL-DECOMPOSITION; HOLLOW NANOCRYSTALS; LITHIUM BATTERIES; MESOPOROUS SILICA; CRYSTALLINE WALLS; ANODE MATERIAL
Issue Date
201407
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.2, no.27, pp.10435 - 10443
Abstract
Nanoporous nanocrystalline metal oxides with tunable oxidation states are crucial for controlling their catalytic, electronic, and optical properties. However, previous approaches to modulate oxidation states in nanoporous metal oxides commonly lead to the breakdown of the nanoporous structure as well as involve concomitant changes in their morphology, pore size, surface area, and nanocrystalline size. Herein, we present a transformative route to nanoporous metal oxides with various oxidation states using manganese oxides as model systems. Thermal conversion of Mn-based metal-organic frameworks (Mn-MOFs) at controlled temperature and atmosphere yielded a series of nanoporous manganese oxides with continuously tuned oxidation states: MnO, Mn3O 4, Mn5O8, and Mn2O3. This transformation enabled the preparation of low-oxidation phase MnO and metastable intermediate phase Mn5O8 with nanoporous architectures, which were previously rarely accessible. Significantly, nanoporous MnO, Mn3O4, and Mn5O8 had a very similar morphology, surface area, and crystalline size. We investigated the electrocatalytic activity of nanoporous manganese oxides for oxygen reduction reaction (ORR) to identify the role of oxidation states, and observed oxidation state-dependent activity and kinetics for the ORR.
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DOI
http://dx.doi.org/10.1039/c4ta01272k
ISSN
2050-7488
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