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

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

doi:10.1021/acsami.6b03502

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

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

55 Scopus citations

Abstract

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).

Original language	English
Pages (from-to)	15086-15092
Number of pages	7
Journal	ACS Applied Materials and Interfaces
Volume	8
Issue number	24
DOIs	https://doi.org/10.1021/acsami.6b03502
State	Published - 22 Jun 2016
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

Keywords

antioxidant
carbon nanoparticles
oxidation
oxygen reduction
superoxide

ASJC Scopus subject areas

General Materials Science

Access to Document

10.1021/acsami.6b03502

Cite this

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title = "Mechanistic Study of the Conversion of Superoxide to Oxygen and Hydrogen Peroxide in Carbon Nanoparticles",

abstract = "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).",

keywords = "antioxidant, carbon nanoparticles, oxidation, oxygen reduction, superoxide",

author = "Jalilov, \{Almaz S.\} and Chenhao Zhang and Samuel, \{Errol L.G.\} and Sikkema, \{William K.A.\} and Gang Wu and Vladimir Berka and Kent, \{Thomas A.\} and Tsai, \{Ah Lim\} and Tour, \{James M.\}",

note = "Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

year = "2016",

month = jun,

day = "22",

doi = "10.1021/acsami.6b03502",

language = "English",

volume = "8",

pages = "15086--15092",

journal = "ACS Applied Materials and Interfaces",

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TY - JOUR

T1 - Mechanistic Study of the Conversion of Superoxide to Oxygen and Hydrogen Peroxide in Carbon Nanoparticles

AU - Jalilov, Almaz S.

AU - Zhang, Chenhao

AU - Samuel, Errol L.G.

AU - Sikkema, William K.A.

AU - Wu, Gang

AU - Berka, Vladimir

AU - Kent, Thomas A.

AU - Tsai, Ah Lim

AU - Tour, James M.

PY - 2016/6/22

Y1 - 2016/6/22

N2 - 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).

AB - 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).

KW - antioxidant

KW - carbon nanoparticles

KW - oxidation

KW - oxygen reduction

KW - superoxide

UR - https://www.scopus.com/pages/publications/84976262131

U2 - 10.1021/acsami.6b03502

DO - 10.1021/acsami.6b03502

M3 - Article

AN - SCOPUS:84976262131

SN - 1944-8244

VL - 8

SP - 15086

EP - 15092

JO - ACS Applied Materials and Interfaces

JF - ACS Applied Materials and Interfaces

IS - 24

ER -

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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