Topotactic Consolidation of Monocrystalline CoZn Hydroxides for Advanced Oxygen Evolution Electrodes

We present a room temperature topotactic consolidation of cobalt and zinc constituents into monocrystalline CoZn hydroxide nanosheets, by a localized corrosion of zinc foils with cobalt precursors. By virtue of similar lattice orientation and structure coordination, the hybrid hydroxides amalgamate...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2016-08, Vol.55 (35), p.10326-10330
Main Authors: Wang, Jing, Tan, Chuan Fu, Zhu, Ting, Ho, Ghim Wei
Format: Article
Language:English
Subjects:
Active sites
Amalgamation
Catalysis
Chemical reactions
Cobalt
cobalt hydroxide
Conductivity
Consolidation
Corrosion
Crystal growth
Crystals
Density
electrocatalysis
Electrochemistry
Electrodes
Evolution
Fabrication
Foils
Functional anatomy
Heavy metals
Homogeneity
Hydroxides
Localized corrosion
Metals
Multiphase
Nanocomposites
Orientation
Oxygen
oxygen evolving reactions
Purity
Separation
single crystals
Temperature effects
topotactic transitions
Transition metals
Zinc
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Summary:We present a room temperature topotactic consolidation of cobalt and zinc constituents into monocrystalline CoZn hydroxide nanosheets, by a localized corrosion of zinc foils with cobalt precursors. By virtue of similar lattice orientation and structure coordination, the hybrid hydroxides amalgamate atomically without phase separation. Importantly, this in situ growth strategy, in combination with configurable percolated nanosheets, renders a high areal density of catalytic sites, immobilized structures, and conductive pathways between the nanosheets and underlying foils—all of which allow monocrystalline CoZn hydroxide nanosheet materials to function as effective electrodes for electrochemical oxygen evolution reactions. This convenient and eco‐friendly topotactical transformation approach facilitates high‐quality single crystal growth with improved multiphase purity and homogeneity, which can be extended to other transition metals for the fabrication of advanced functional nanocomposites. Tactical topology: A topotactic consolidation of cobalt and zinc constituents into monocrystalline CoZn hydroxide nanosheets is demonstrated for direct electrochemical oxygen evolution reactions.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201605096