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Coordination tuning of cobalt phosphates towards efficient water oxidation catalyst

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Title
Coordination tuning of cobalt phosphates towards efficient water oxidation catalyst
Author(s)
Kim, H.; Park, J.; Park, I.; Jin, K.; Jerng, S.E.; Kim, S.H.; Nam, K.T.; Kisuk Kang
Publication Date
2015-09
Journal
NATURE COMMUNICATIONS, v.6, no., pp.8253 -
Publisher
NATURE PUBLISHING GROUP
Abstract
The development of efficient and stable water oxidation catalysts is necessary for the realization of practically viable water-splitting systems. Although extensive studies have focused on the metal-oxide catalysts, the effect of metal coordination on the catalytic ability remains still elusive. Here we select four cobalt-based phosphate catalysts with various cobalt- and phosphate-group coordination as a platform to better understand the catalytic activity of cobalt-based materials. Although they exhibit various catalytic activities and stabilities during water oxidation, Na 2 CoP 2 O 7 with distorted cobalt tetrahedral geometry shows high activity comparable to that of amorphous cobalt phosphate under neutral conditions, along with high structural stability. First-principles calculations suggest that the surface reorganization by the pyrophosphate ligand induces a highly distorted tetrahedral geometry, where water molecules can favourably bind, resulting in a low overpotential (1/40.42 €‰eV). Our findings emphasize the importance of local cobalt coordination in the catalysis and suggest the possible effect of polyanions on the water oxidation chemistry. © Macmillan Publishers Limited. All rights reserved
URI
http://pr.ibs.re.kr/handle/8788114/1900
DOI
10.1038/ncomms9253
ISSN
2041-1723
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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