Tailoring oxygen vacancies in Co3O4 yolk-shell nanospheres via for boosted peroxymonosulfate activation: Single-electron transfer and high-valent Co-oxo species-dominated non-radical pathways
- Authors
- Khiem, Ta Cong; Huy, Nguyen Nhat; Kwon, Eilhann; Wacławek, Stanisław; Ebrahimi, Afshin; Oh, Wen-Da; Ghotekar, Suresh; Tsang, Yiu Fai; Chen, Wei-Hsin; Lin, Kun-Yi Andrew
- Issue Date
- Nov-2023
- Publisher
- Elsevier B.V.
- Keywords
- Co3O4; High-valent cobalt-oxo species; Oxygen vacancy; Phenol degradation; Single-electron transfer
- Citation
- Chemical Engineering Journal, v.476, pp 1 - 20
- Pages
- 20
- Indexed
- SCIE
SCOPUS
- Journal Title
- Chemical Engineering Journal
- Volume
- 476
- Start Page
- 1
- End Page
- 20
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/194307
- DOI
- 10.1016/j.cej.2023.146404
- ISSN
- 1385-8947
1873-3212
- Abstract
- As Co3O4 represents a promising material for peroxymonosulfate (PMS) activation, a yolk-shell-structured nanosphere, Co3O4-x-0.20, is developed here for maximizing its catalytic activity by governing electronic structures via tailoring oxygen vacancies (OV) of Co3O4. This OV-tailored Co3O4 enables single-electron transfer and generates high-valent cobalt-oxo species (Co(IV) = O) to achieve the fastest phenol degradation. The single-electron transfer is unraveled by an electron donation of Co atoms near OV to O2 to form O2[rad]− followed by O2 evolution after 1O2 and the charge balance maintained by an electron acquisition from phenol by the electron-deficient Co atoms. Meanwhile, the generation of Co(IV) = O by the cleavage of the S[sbnd]O bond in the Co(II)-O-SO3-OH complex accepts electrons from phenol to turn back to Co(II) and Co(III), causing phenol oxidation. These results demonstrate the pre-eminence of Co3O4-x-0.20 over the reported catalysts for phenol degradation and also offer insights into the mechanism of OV triggering electron donation and enhancing Co(IV) = O generation.
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