The DOI matches its Crossref record; 10 of the 10 references it cites were found in a registry or an index.
Breaking Long-Range Order in Iridium Oxide by Alkali Ion for Efficient Water Oxidation
Abstract
Oxygen electrochemistry plays a critical role in clean energy technologies such as fuel cells and electrolyzers, but the oxygen evolution reaction (OER) severely restricts the efficiency of these devices due to its slow kinetics. Here, we show that via incorporation of lithium ion into iridium oxide, the thus obtained amorphous iridium oxide (Li–IrO x ) demonstrates outstanding water oxidation activity with an OER current density of 10 mA/cm 2 at 270 mV overpotential for 10 h of continuous operation in acidic electrolyte. DFT calculations show that lithium incorporation into iridium oxide is able to lower the activation barrier for OER. X-ray absorption characterizations indicate that both amorphous Li–IrO x and rutile IrO 2 own similar [IrO 6 ] octahedron units but have different [IrO 6 ] octahedron connection modes. Oxidation of iridium to higher oxidation states along with shrinkage in the Ir–O bond was observed by in situ X-ray absorption spectroscopy on amorphous Li–IrO x, but not on rutile IrO 2 under OER operando conditions. The much more “flexible” disordered [IrO 6 ] octahedrons with higher oxidation states in amorphous Li–IrO x as compared to the periodically interconnected “rigid” [IrO 6 ] octahedrons in crystalline IrO 2 are able to act as more electrophilic centers and thus effectively promote the fast turnover of water oxidation.
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Cited by
Iridium Single Atoms Coupling with Oxygen Vacancies Boosts Oxygen Evolution Reaction in Acid Media
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Iridium-based nanomaterials for electrochemical water splitting
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Metadata
- Authors
- Gao, J., Xu, C.-Q., Hung, S.-F., Liu, W., Cai, W., Zeng, Z., Jia, C., Chen, H. M., Xiao, H., Li, J., Huang, Y., & Liu, B.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-01-23
- Volume
- 141
- Issue
- 7
- Pages
- 3014-3023
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2912768302
- Cited by
- 540
- References
- 10
- FWCI
- 11.34
- Type
- journal article
- Language
- en
- Open access
- closed
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- Gao, J., Xu, C.-Q., Hung, S.-F., Liu, W., Cai, W., Zeng, Z., Jia, C., Chen, H. M., Xiao, H., Li, J., Huang, Y., & Liu, B. (2019). Breaking Long-Range Order in Iridium Oxide by Alkali Ion for Efficient Water Oxidation. Journal of the American Chemical Society. https://doi.org/10.1021/jacs.8b11456
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