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Quasi-single-crystalline CoO hexagrams with abundant defects for highly efficient electrocatalytic water oxidation.


ABSTRACT: Defects and structural long-range ordering have been recognized as two crucial characters for advanced electrocatalysts. However, these two features have rarely been achieved together. Herein, we report the preparation of single-crystalline CoO hexagrams and demonstrate their exceptional electrocatalytic properties for water oxidation. The quasi-single-crystalline CoO hexagrams, prepared at the critical phase transition point of ?-Co(OH)2/Co(OH)F hexagrams, possess both abundant oxygen vacancies as defects and structural long-range ordering. The matching between the b-axis of Co(OH)F crystals and the a-axis of ?-Co(OH)2 crystals is critical for the formation of the CoO hexagram single crystals. The quasi-single-crystalline CoO hexagrams with abundant defects are highly efficient for water oxidation by delivering a 10 mA cm-2 current density at a low overpotential of 269 mV in a 1 M KOH aqueous solution.

SUBMITTER: Liang Z 

PROVIDER: S-EPMC6124914 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature

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Quasi-single-crystalline CoO hexagrams with abundant defects for highly efficient electrocatalytic water oxidation.

Liang Zuozhong Z   Huang Zhehao Z   Yuan Haitao H   Yang Zhiyuan Z   Zhang Chaochao C   Xu Yang Y   Zhang Wei W   Zheng Haoquan H   Cao Rui R  

Chemical science 20180720 34


Defects and structural long-range ordering have been recognized as two crucial characters for advanced electrocatalysts. However, these two features have rarely been achieved together. Herein, we report the preparation of single-crystalline CoO hexagrams and demonstrate their exceptional electrocatalytic properties for water oxidation. The quasi-single-crystalline CoO hexagrams, prepared at the critical phase transition point of β-Co(OH)<sub>2</sub>/Co(OH)F hexagrams, possess both abundant oxyge  ...[more]

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