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  Plasma-etched functionalized graphene as a metal-free electrode catalyst in solid acid fuel cells

Lu, X., Yang, X., Tariq, M., Li, F., Steimecke, M., Li, J., et al. (2020). Plasma-etched functionalized graphene as a metal-free electrode catalyst in solid acid fuel cells. Journal of Materials Chemistry A, 8(5), 2445-2452. doi:10.1039/C9TA10821A.

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https://doi.org/10.1039/C9TA10821A (Publisher version)
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 Creators:
Lu, Xubin1, Author
Yang, Xin1, Author
Tariq, Muhammad1, Author
Li, Fan2, Author              
Steimecke, Matthias1, Author
Li, Jia1, Author
Varga, Arom1, Author
Bron, Michael1, Author
Abel, Bernd1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society, ou_3287476              

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 Abstract: The Oxygen and nitrogen plasma treatment were applied to produce graphene with abundant edges, oxygen functional groups, and nitrogen doping. The plasma-etched graphene was then used as a metal-free electrocatalyst in a solid acid fuel cell. Scanning electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy were used to characterize the graphene layers. Alternating-current impedance spectroscopy of a hybrid electrode containing the plasma-etched graphene and cesium dihydrogen phosphate as proton-conducting solid acid illustrated its remarkable catalytic activity under cathodic conditions. Thus, both O2 and N2 plasma treatment activated the material. While O2 plasma was a more effective activator than N2 plasma, it also resulted in higher degradation rates. A combination of density functional theory calculations and experimental results indicated that zigzag carbon was the most active site for the oxygen reduction reaction on both O2 and N2 plasma-etched graphene. Furthermore, the armchair carbons adjacent to the surface oxygen groups and doped heteroatoms were also important active sites for O2 and N2 plasma-etched graphene, respectively. The results of this study will guide future endeavors in the development of non-precious metal catalysts for use as fuel cell cathodes.

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 Dates: 2020-01-03
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: P13877
DOI: 10.1039/C9TA10821A
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Title: Journal of Materials Chemistry A
  Abbreviation : J. Mater. Chem. A
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 8 (5) Sequence Number: - Start / End Page: 2445 - 2452 Identifier: ISSN: 2050-7488
CoNE: https://pure.mpg.de/cone/journals/resource/2050-7488