Coordination Tuning of Cobalt Phosphates toward efficient water oxidation catalyst

Title
Coordination Tuning of Cobalt Phosphates toward efficient water oxidation catalyst
Authors
김현아박지민박인철진경석정성은김선희남기태강기석
Keywords
Chemical sciences; Catalysis; Materials science
Issue Date
2015-09
Publisher
Nature Communications
Citation
VOL 6, NO 8253
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, Na2CoP2O7 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 (B0.42 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.
URI
http://pubs.kist.re.kr/handle/201004/50450
ISSN
20411723
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KIST Publication > Article
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