Ordered Mesoporous Cobalt Oxide as Highly Efficient Oxygen Evolution Catalyst

被引:383
作者
Rosen, Jonathan [1 ]
Hutchings, Gregory S. [1 ]
Jiao, Feng [1 ]
机构
[1] Univ Delaware, Ctr Catalyt Sci & Technol, Dept Chem & Biomol Engn, Newark, DE 19716 USA
关键词
PHOTOCATALYTIC WATER OXIDATION; METAL-OXIDES; LIGHT; PHOSPHATE;
D O I
10.1021/ja400555q
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Oxygen evolution from water by use of earth-abundant element-based catalysts is crucial for mass solar fuel production. In this report, a mesoporous cobalt oxide with an ultrahigh surface area (up to 250 m(2).g(-1)) has been fabricated through Mg substitution in the mesoporous Co3O4 spinel, followed by a Mg-selective leaching process. Approximately a third of Mg cations were removed in the leaching process, resulting in a highly porous cobalt oxide with a significant amount of defects in the spinel structure. The activated mesoporous cobalt oxide exhibited high oxygen evolution activities in both the visible-light-driven [Ru(bpy)(3)](2+)-persulfate system and the Ce4+/Ce3+ chemical water oxidation system. Under a strong acidic environment, a high turnover frequency (TOF) of similar to 22 X 10(-3) s(-1) per Co atom was achieved, which is more than twice the TOF of traditional hard-templated, mesoporous Co3O4.
引用
收藏
页码:4516 / 4521
页数:6
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