Coordination tuning of cobalt phosphates towards efficient water oxidation catalyst

Hyunah Kim, Jimin Park, Inchul Park, Kyoungsuk Jin, Sung Eun Jerng, Sun Hee Kim, Ki Tae Nam, Kisuk Kang

Research output: Contribution to journalArticlepeer-review

336 Citations (Scopus)

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.

Original languageEnglish
Article number8253
JournalNature communications
Volume6
DOIs
Publication statusPublished - 2015 Sept 14
Externally publishedYes

Bibliographical note

Funding Information:
This research was supported by Project Code (IBS-R006-G1) and by the Supercomputing Center/Korea Institute of Science and Technology Information with supercomputing resources including technical support (KSC-2013-C3-038), by Global Frontier R&D Program on Center for Multiscale Energy System funded by the National Research Foundation (NRF) under the Ministry of Science, ICT and Future, Korea (0420-20130104), and by Fusion Research Program for Green Technologies through the NRF funded by the Ministry of Science, ICT and Future (2012M3C1A1048863), and the National Reserch Council of Science and Technology through the Degree and Research Center Program (DRC-14-3-KBSI).

Publisher Copyright:
© Macmillan Publishers Limited. All rights reserved.

ASJC Scopus subject areas

  • General Physics and Astronomy
  • General Chemistry
  • General Biochemistry,Genetics and Molecular Biology

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