Mechanistic Study of the Conversion of Superoxide to Oxygen and Hydrogen Peroxide in Carbon Nanoparticles

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• 作者：Almaz S. Jalilov ; Chenhao Zhang ; Errol L. G. Samuel ; William K. A. Sikkema ; Gang Wu ; Vladimir Berka ; Thomas A. Kent ; Ah-Lim Tsai ; James M. Tour
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：June 22, 2016
• 年：2016
• 卷：8
• 期：24
• 页码：15086-15092
• 全文大小：415K
• 年卷期：0
• ISSN：1944-8252

文摘

Hydrophilic carbon clusters (HCCs) are oxidized carbon nanoparticles with a high affinity for electrons. The electron accepting strength of HCCs, employing the efficient conversion of superoxide (O₂^•–) to molecular oxygen (O₂) via single-electron oxidation, was monitored using cyclic voltammetry and electron paramagnetic resonance spectroscopy. We found that HCCs possess O₂ reduction reaction (ORR) capabilities through a two-electron process with the formation of H₂O₂. By comparing results from aprotic solvents to those obtained from ORR activity in aqueous media, we propose a mechanism for the origin of the antioxidant and superoxide dismutase mimetic properties of poly(ethylene glycolated) hydrophilic carbon clusters (PEG-HCCs).