Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/142457
Title: High spin state promotes water oxidation catalysis at neutral pH in spinel cobalt oxide
Authors: Ma, Lin
Hung, Sung-Fu
Zhang, Liping
Cai, Weizheng
Yang, Hongbin
Chen, Hao Ming
Liu, Bin
Keywords: Engineering::Chemical technology
Issue Date: 2018
Source: Ma, L., Hung, S.-F., Zhang, L., Cai, W., Yang, H., Chen, H. M., & Liu, B. (2018). High spin state promotes water oxidation catalysis at neutral pH in spinel cobalt oxide. Industrial & Engineering Chemistry Research, 57(5), 1441-1445. doi:10.1021/acs.iecr.7b04812
Journal: Industrial & Engineering Chemistry Research
Abstract: In this work, we present Co3O4 quantum dots (QDs) as a highly efficient and stable oxygen evolution reaction (OER) catalyst at neutral pH. The Co3O4 QDs with a mean size of 5 nm were synthesized by reacting cobalt acetate with benzyl alcohol in the presence of ammonia under reflux conditions. The as-synthesized Co3O4 QDs show extraordinary water oxidation activity with onset overpotential as low as 398 mV and mass activity as high as 567 A/g (at 1.75 V vs RHE) in a 0.2 M phosphate buffer electrolyte (pH ∼7), which are among the most efficient Earth-abundant OER catalysts at neutral pH reported in the literature, reaching a stable current density of 10 mA/cm2 at an overpotential of ∼490 mV with a Tafel slope of 80 mV/decade. Through in-depth investigations by X-ray photoelectron spectroscopy and X-ray absorption spectroscopy, the high spin Co2+ and Co3+ cations on the surface of Co3O4 QDs were found to be important to promote the OER kinetics at neutral pH.
URI: https://hdl.handle.net/10356/142457
ISSN: 0888-5885
DOI: 10.1021/acs.iecr.7b04812
Schools: School of Chemical and Biomedical Engineering 
Rights: © 2018 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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