Ordered Mesoporous Cobalt Oxide as Highly Efficient Oxygen Evolution Catalyst

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 m2·g–1) has been fabricated through Mg substitution in the mesoporous Co3O4 spinel, followed by...

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Published inJournal of the American Chemical Society Vol. 135; no. 11; pp. 4516 - 4521
Main Authors Rosen, Jonathan, Hutchings, Gregory S, Jiao, Feng
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 20.03.2013
Subjects
36
catalysts
cations
cobalt
cobalt oxide
fuel production
leaching
magnesium
oxidation
oxygen production
porous media
solar energy
surface area
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Summary: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 m2·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 ∼2.2 × 10–3 s–1 per Co atom was achieved, which is more than twice the TOF of traditional hard-templated, mesoporous Co3O4.
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content type line 23
DE-AC02-98CH10886
USDOE SC OFFICE OF SCIENCE (SC)
BNL-100614-2013-JA
ISSN:0002-7863
1520-5126
1520-5126
DOI:10.1021/ja400555q