High-loaded single Cu atoms decorated on N-doped graphene for boosting Fenton-like catalysis under neutral pH

Here, single-atom Cu dispersed on N-doped graphene (Cu-SA/NGO) with relatively high Cu loading of 5.8 wt% was prepared for boosting the degradation of contaminants. This is the highest value yet reported for dispersion of single metal atoms on graphene. Atomically dispersed CuN 4 moieties were confi...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2020-01, Vol.8 (27), p.13685-13693
Main Authors: Wu, Qianyuan, Wang, Jin, Wang, Zhiwei, Xu, Yalan, Xing, Zhihui, Zhang, Xinyang, Guan, Yuntao, Liao, Guangfu, Li, Xinzheng
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Catalytic oxidation
Contaminants
Copper
Degradation
Density functional theory
Dispersion
Fine structure
Graphene
Hydrogen peroxide
Hydroxyl radicals
NGOs
Nongovernmental organizations
Organic contaminants
Oxidation
pH effects
Scanning transmission electron microscopy
Spectroscopy
Transmission electron microscopy
Ultrastructure
X ray absorption
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Summary:Here, single-atom Cu dispersed on N-doped graphene (Cu-SA/NGO) with relatively high Cu loading of 5.8 wt% was prepared for boosting the degradation of contaminants. This is the highest value yet reported for dispersion of single metal atoms on graphene. Atomically dispersed CuN 4 moieties were confirmed by high-angle annular dark field-scanning transmission electron microscopy and X-ray absorption fine structure spectroscopy. The prepared Cu-SA/NGO shows remarkable activity and stability in the degradation of various organic contaminants at neutral pH. This excellent performance is mainly ascribed to the large number of active sites obtained from high single-atom-Cu loading. Density functional theory calculations confirmed that CuN 4 moieties serve as the active sites, with low energy barriers for hydroxyl radical (&z.rad;OH) generation. These supported single-atom catalysts (SACs) catalyze the heterogeneous Fenton reaction via proton-mediated H 2 O 2 -homolytic pathway. This work offers a new method for fabricating various SACs with high loading levels for catalytic oxidation reactions. A single-atom Cu dispersed on N-doped graphene with ultrahigh Cu loading of 5.8 wt% was prepared for boosting the degradation of contaminants.
ISSN:2050-7488
2050-7496
DOI:10.1039/d0ta04943c