期刊
CHEMICAL SCIENCE
卷 9, 期 34, 页码 6961-6968出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8sc02294a
关键词
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资金
- Thousand Talents Program of China
- National Natural Science Foundation of China [21101170, 21573139, 21601118, 21773146]
- Fundamental Research Funds for the Central Universities
- Research Funds of Shaanxi Normal University
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.
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