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Multilayer N‐doped Graphene Films as Photoelectrodes for H 2 Evolution
Author(s) -
Garcia Alejandra,
Albero Josep,
García Hermenegildo
Publication year - 2017
Publication title -
chemphotochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.13
H-Index - 18
ISSN - 2367-0932
DOI - 10.1002/cptc.201700049
Subject(s) - graphene , materials science , doping , pyrolytic carbon , dielectric spectroscopy , optoelectronics , electrode , photocatalysis , polarization (electrochemistry) , water splitting , hydrogen production , nanotechnology , hydrogen , analytical chemistry (journal) , chemical engineering , electrochemistry , chemistry , pyrolysis , biochemistry , chromatography , engineering , organic chemistry , catalysis
Multilayer N‐doped graphene photoelectrodes have been prepared following a straightforward one‐step pyrolytic fabrication method. The N‐doped graphene photoelectrodes have been demonstrated to work both as semitransparent electrodes and as efficient photoelectrocatalysts for H 2 evolution at low bias. N‐doped graphene photoelectrodes exhibited a constant H 2 generation rate of 3.64 μmol h −1 cm 2 at 0.2 V under 3443 W m −2 irradiation for 17 h, reaching an applied‐bias‐compensated solar‐to‐hydrogen efficiency of 1.8 %. The N‐doped graphene photoelectrodes show light‐intensity dependence as well as photocatalytic activity for H 2 evolution in the UV/Vis spectral region. Impedance spectroscopy provides experimental evidence indicating that charge separation within N‐doped graphene increases upon positive bias polarization of the photoelectrode.