Details

Autor(en) / Beteiligte

• Zhao, Guoqiang
• Chen, Tianci
• Tang, Aidong
• Yang, Huaming

Titel

Modulating coal-derived carbon toward electrocatalytic generation of hydroxyl radicals for organic contaminant removal

Ist Teil von

• Journal of materials chemistry. A, Materials for energy and sustainability, 2024-03, Vol.12 (12), p.7227-7236

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The three-electron oxygen reduction reaction (3e − ORR), which consists of the electrochemical production of hydrogen peroxide (H 2 O 2 ) and the subsequent activation, allows for the facile generation of hydroxyl radicals (&z.rad;OH) for environmental remediation. However, the current understanding on designing the corresponding electrocatalyst is not adequate. Herein, carbon-based electrocatalysts are prepared using bituminous coal as the raw material to obtain a high content of oxygen, which is crucial for H 2 O 2 production, and the oxygen-containing functional groups (OFGs) in the electrocatalyst are modulated to improve the &z.rad;OH production efficiency. Experimental and calculation results demonstrate that C&z.dbd;O groups serve as active sites for not only H 2 O 2 formation but also the activation of H 2 O 2 to produce &z.rad;OH, while H 2 O 2 desorption and H 2 O 2 activation are more favorable at COOH and C&z.dbd;O sites, respectively. Therefore, after deliberately removing COOH groups from the coal-derived carbon surface, the &z.rad;OH production efficiency is increased, leading to the fast removal of organic dyes from water. Our results demonstrate the significance of modulating the surface OFGs on the carbon-based electrocatalyst toward efficient &z.rad;OH production from the 3e − ORR, which provides a green and sustainable route toward organic contaminant removal from water. Coal-derived carbon catalysts are modulated for producing hydroxyl radicals from oxygen gas to remove organic contaminants from water, and the roles of oxygen containing groups are explored, which would contribute to a greener society.