Publication Date
2023
Journal or Book Title
ACS Applied Materials & Interfaces
Abstract
The chlorine evolution reaction (CER) is a key reaction in electrochemical oxidation (EO) of water treatment. Conventional anodes based on platinum group metals can be prohibitively expensive, which hinders further application of EO systems. Crystalline cobalt antimonate (CoSbxOy) was recently identified as a promising alternative to conventional anodes due to its high catalytic activity and stability in acidic media. However, its catalytic sites and reaction mechanism have not yet been elucidated. This study sheds light on the catalytically active sites in crystalline CoSbxOy anodes by using scanning electrochemical microscopy to compare the CER catalytic activities of a series of anode samples with different bulk Sb/Co ratios (from 1.43 to 2.80). The results showed that Sb sites served as more active catalytic sites than the Co sites. The varied Sb/Co ratios were also linked with slightly different electronic states of each element, leading to different CER selectivities in 30 mM chloride solutions under 10 mA cm–2 current density. The high activity of Sb sites toward the CER highlighted the significance of the electronic polarization that changed the oxidation states of Co and Sb.
DOI
https://doi.org/10.1021/acsami.3c05016
Volume
15
Issue
34
License
UMass Amherst Open Access Policy
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Dong, Heng; Shao, Xiaohan; Hancox, Shane; McBeath, Sean T.; Tarpeh, William A.; and Hoffmann, Michael R., "Understanding the Catalytic Active Sites of Crystalline CoSbxOy for Electrochemical Chlorine Evolution" (2023). ACS Applied Materials & Interfaces. 857.
https://doi.org/10.1021/acsami.3c05016