Molecular engineering of a cobalt-based electrocatalytic nanomaterial for H2 evolution under fully aqueous conditions

Title
Molecular engineering of a cobalt-based electrocatalytic nanomaterial for H2 evolution under fully aqueous conditions
Author
Tran Dinh Phong
Keywords
WATER-OXIDATION; HYDROGEN-EVOLUTION; CARBON NANOTUBES; HETEROGENEOUS CATALYSIS; IRIDIUM COMPLEXES; FUNCTIONAL MODELS; COBALOXIMES; MECHANISM; POLYOXOMETALATE; OVERPOTENTIALS
Issue Date
2012-10
Publisher
Nature Publishing Group
Citation
Nature Chemistry, Vol.5 No.1 [2013], 48-53
Abstract
The viability of a hydrogen economy depends on the design of efficient catalytic systems based on earth-abundant elements. Innovative breakthroughs for hydrogen evolution based on molecular tetraimine cobalt compounds have appeared in the past decade. Here we show that such a diimine-dioxime cobalt catalyst can be grafted to the surface of a carbon nanotube electrode. The resulting electrocatalytic cathode material mediates H-2 generation (55,000 turnovers in seven hours) from fully aqueous solutions at low-to-medium overpotentials. This material is remarkably stable, which allows extensive cycling with preservation of the grafted molecular complex, as shown by electrochemical studies, X-ray photoelectron spectroscopy and scanning electron microscopy. This clearly indicates that grafting provides an increased stability to these cobalt catalysts, and suggests the possible application of these materials in the development of technological devices.
URI
https://www.nature.com/articles/nchem.1481http://hdl.handle.net/20.500.11754/39667
ISSN
1755-4330; 1755-4349
DOI
10.1038/nchem.1481
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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