Effects of halogen doping on nanocarbon catalysts synthesized by a solution plasma process for the oxygen reduction reaction

Takahiro Ishizaki, Yuta Wada, Satoshi Chiba, Sou Kumagai, Hoonseung Lee, Ai Serizawa, Oi Lun Li, Gasidit Panomsuwan

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Halogen-doped carbon nanoparticles (CNPs) were synthesized by a simple one-step solution plasma process at room temperature using a mixture of benzene (C6H6) and organics containing halogen atoms as the precursors (i.e., hexafluorobenzene (C6F6), hexachlorobenzene (C6Cl6), and hexabromobenzene (C6Br6)). The experimental results demonstrated that halogen doping, especially F and Cl, could lead to more efficient removal of residual hydrogen compared to carbon synthesized with pure benzene. This phenomenon was related to the different binding energies between hydrogen and halogens to form hydrogen halides. Their crystallinity and morphology did not change and remained the same as non-doped carbon. The electrochemical evaluation of oxygen reduction reaction (ORR) activity in an alkaline solution revealed that halogen doping did not play a significant role in shifting the onset potential for the ORR, while a slight enhancement in diffusion limited current density was observed at high overpotentials. Moreover, the electron transfer number involved in the ORR process determined from the Koutecky-Levich plot at -0.6 V was found to increase for halogen-doped carbons in the following order: F-CNPs > Br-CNPs > Cl-CNPs > CNPs. The improved ORR performance of F-CNPs could reasonably be attributed to the synergistic effects of specific bonding states between the halogen and carbon, structural defects and surface functional groups. Our results confirmed the validity of using halogen doping to improve the ORR catalytic activity of CNPs.

Original languageEnglish
Pages (from-to)21843-21851
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume18
Issue number31
DOIs
Publication statusPublished - 2016

Fingerprint

Halogens
halogens
Carbon
Doping (additives)
Oxygen
Plasmas
catalysts
Catalysts
carbon
oxygen
Nanoparticles
nanoparticles
Hydrogen
Benzene
hydrogen
benzene
Hexachlorobenzene
Binding energy
Functional groups
halides

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Effects of halogen doping on nanocarbon catalysts synthesized by a solution plasma process for the oxygen reduction reaction. / Ishizaki, Takahiro; Wada, Yuta; Chiba, Satoshi; Kumagai, Sou; Lee, Hoonseung; Serizawa, Ai; Li, Oi Lun; Panomsuwan, Gasidit.

In: Physical Chemistry Chemical Physics, Vol. 18, No. 31, 2016, p. 21843-21851.

Research output: Contribution to journalArticle

Ishizaki, Takahiro ; Wada, Yuta ; Chiba, Satoshi ; Kumagai, Sou ; Lee, Hoonseung ; Serizawa, Ai ; Li, Oi Lun ; Panomsuwan, Gasidit. / Effects of halogen doping on nanocarbon catalysts synthesized by a solution plasma process for the oxygen reduction reaction. In: Physical Chemistry Chemical Physics. 2016 ; Vol. 18, No. 31. pp. 21843-21851.
@article{8dc4ad314f954c3faf19374a56935261,
title = "Effects of halogen doping on nanocarbon catalysts synthesized by a solution plasma process for the oxygen reduction reaction",
abstract = "Halogen-doped carbon nanoparticles (CNPs) were synthesized by a simple one-step solution plasma process at room temperature using a mixture of benzene (C6H6) and organics containing halogen atoms as the precursors (i.e., hexafluorobenzene (C6F6), hexachlorobenzene (C6Cl6), and hexabromobenzene (C6Br6)). The experimental results demonstrated that halogen doping, especially F and Cl, could lead to more efficient removal of residual hydrogen compared to carbon synthesized with pure benzene. This phenomenon was related to the different binding energies between hydrogen and halogens to form hydrogen halides. Their crystallinity and morphology did not change and remained the same as non-doped carbon. The electrochemical evaluation of oxygen reduction reaction (ORR) activity in an alkaline solution revealed that halogen doping did not play a significant role in shifting the onset potential for the ORR, while a slight enhancement in diffusion limited current density was observed at high overpotentials. Moreover, the electron transfer number involved in the ORR process determined from the Koutecky-Levich plot at -0.6 V was found to increase for halogen-doped carbons in the following order: F-CNPs > Br-CNPs > Cl-CNPs > CNPs. The improved ORR performance of F-CNPs could reasonably be attributed to the synergistic effects of specific bonding states between the halogen and carbon, structural defects and surface functional groups. Our results confirmed the validity of using halogen doping to improve the ORR catalytic activity of CNPs.",
author = "Takahiro Ishizaki and Yuta Wada and Satoshi Chiba and Sou Kumagai and Hoonseung Lee and Ai Serizawa and Li, {Oi Lun} and Gasidit Panomsuwan",
year = "2016",
doi = "10.1039/c6cp03579e",
language = "English",
volume = "18",
pages = "21843--21851",
journal = "Physical Chemistry Chemical Physics",
issn = "1463-9076",
publisher = "Royal Society of Chemistry",
number = "31",

}

TY - JOUR

T1 - Effects of halogen doping on nanocarbon catalysts synthesized by a solution plasma process for the oxygen reduction reaction

AU - Ishizaki, Takahiro

AU - Wada, Yuta

AU - Chiba, Satoshi

AU - Kumagai, Sou

AU - Lee, Hoonseung

AU - Serizawa, Ai

AU - Li, Oi Lun

AU - Panomsuwan, Gasidit

PY - 2016

Y1 - 2016

N2 - Halogen-doped carbon nanoparticles (CNPs) were synthesized by a simple one-step solution plasma process at room temperature using a mixture of benzene (C6H6) and organics containing halogen atoms as the precursors (i.e., hexafluorobenzene (C6F6), hexachlorobenzene (C6Cl6), and hexabromobenzene (C6Br6)). The experimental results demonstrated that halogen doping, especially F and Cl, could lead to more efficient removal of residual hydrogen compared to carbon synthesized with pure benzene. This phenomenon was related to the different binding energies between hydrogen and halogens to form hydrogen halides. Their crystallinity and morphology did not change and remained the same as non-doped carbon. The electrochemical evaluation of oxygen reduction reaction (ORR) activity in an alkaline solution revealed that halogen doping did not play a significant role in shifting the onset potential for the ORR, while a slight enhancement in diffusion limited current density was observed at high overpotentials. Moreover, the electron transfer number involved in the ORR process determined from the Koutecky-Levich plot at -0.6 V was found to increase for halogen-doped carbons in the following order: F-CNPs > Br-CNPs > Cl-CNPs > CNPs. The improved ORR performance of F-CNPs could reasonably be attributed to the synergistic effects of specific bonding states between the halogen and carbon, structural defects and surface functional groups. Our results confirmed the validity of using halogen doping to improve the ORR catalytic activity of CNPs.

AB - Halogen-doped carbon nanoparticles (CNPs) were synthesized by a simple one-step solution plasma process at room temperature using a mixture of benzene (C6H6) and organics containing halogen atoms as the precursors (i.e., hexafluorobenzene (C6F6), hexachlorobenzene (C6Cl6), and hexabromobenzene (C6Br6)). The experimental results demonstrated that halogen doping, especially F and Cl, could lead to more efficient removal of residual hydrogen compared to carbon synthesized with pure benzene. This phenomenon was related to the different binding energies between hydrogen and halogens to form hydrogen halides. Their crystallinity and morphology did not change and remained the same as non-doped carbon. The electrochemical evaluation of oxygen reduction reaction (ORR) activity in an alkaline solution revealed that halogen doping did not play a significant role in shifting the onset potential for the ORR, while a slight enhancement in diffusion limited current density was observed at high overpotentials. Moreover, the electron transfer number involved in the ORR process determined from the Koutecky-Levich plot at -0.6 V was found to increase for halogen-doped carbons in the following order: F-CNPs > Br-CNPs > Cl-CNPs > CNPs. The improved ORR performance of F-CNPs could reasonably be attributed to the synergistic effects of specific bonding states between the halogen and carbon, structural defects and surface functional groups. Our results confirmed the validity of using halogen doping to improve the ORR catalytic activity of CNPs.

UR - http://www.scopus.com/inward/record.url?scp=84981294382&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84981294382&partnerID=8YFLogxK

U2 - 10.1039/c6cp03579e

DO - 10.1039/c6cp03579e

M3 - Article

AN - SCOPUS:84981294382

VL - 18

SP - 21843

EP - 21851

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

SN - 1463-9076

IS - 31

ER -