TY - JOUR
T1 - Nitrogen functionalization of cvd grown three-dimensional graphene foam for hydrogen evolution reactions in alkaline media
AU - Ion-Ebrașu, Daniela
AU - Andrei, Radu Dorin
AU - Enache, Stanică
AU - Căprărescu, Simona
AU - Negrilă, Constantin Cătălin
AU - Jianu, Cătălin
AU - Enache, Adrian
AU - Boerașu, Iulian
AU - Carcadea, Elena
AU - Varlam, Mihai
AU - Vasile, Bogdan Ștefan
AU - Ren, Jianwei
N1 - Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/9/1
Y1 - 2021/9/1
N2 - Three-dimensional graphene foam (3D-GrFoam) is a highly porous structure and sus-tained lattice formed by graphene layers with sp2 and sp3 hybridized carbon. In this work, chemical vapor deposition (CVD)—grown 3D-GrFoam was nitrogen-doped and platinum functionalized using hydrothermal treatment with different reducing agents (i.e., urea, hydrazine, ammonia, and dihydrogen hexachloroplatinate (IV) hydrate, respectively). X-ray photoelectron spectroscopy (XPS) survey showed that the most electrochemically active nitrogen-doped sample (GrFoam3N) contained 1.8 at % of N, and it exhibited a 172 mV dec−1 Tafel plot associated with the Volmer– Heyrovsky hydrogen evolution (HER) mechanism in 0.1 M KOH. By the hydrothermal process, 0.2 at % of platinum was anchored to the graphene foam surface, and the resultant sample of GrFoamPt yielded a value of 80 mV dec−1 Tafel associated with the Volmer–Tafel HER mechanism. Further-more, Raman and infrared spectroscopy analysis, as well as scanning electron microscopy (SEM) were carried out to understand the structure of the samples.
AB - Three-dimensional graphene foam (3D-GrFoam) is a highly porous structure and sus-tained lattice formed by graphene layers with sp2 and sp3 hybridized carbon. In this work, chemical vapor deposition (CVD)—grown 3D-GrFoam was nitrogen-doped and platinum functionalized using hydrothermal treatment with different reducing agents (i.e., urea, hydrazine, ammonia, and dihydrogen hexachloroplatinate (IV) hydrate, respectively). X-ray photoelectron spectroscopy (XPS) survey showed that the most electrochemically active nitrogen-doped sample (GrFoam3N) contained 1.8 at % of N, and it exhibited a 172 mV dec−1 Tafel plot associated with the Volmer– Heyrovsky hydrogen evolution (HER) mechanism in 0.1 M KOH. By the hydrothermal process, 0.2 at % of platinum was anchored to the graphene foam surface, and the resultant sample of GrFoamPt yielded a value of 80 mV dec−1 Tafel associated with the Volmer–Tafel HER mechanism. Further-more, Raman and infrared spectroscopy analysis, as well as scanning electron microscopy (SEM) were carried out to understand the structure of the samples.
KW - Chemical vapor deposition
KW - Graphene
KW - Hydrogen evolution reaction
KW - Nitrogen-doping
UR - http://www.scopus.com/inward/record.url?scp=85114087068&partnerID=8YFLogxK
U2 - 10.3390/ma14174952
DO - 10.3390/ma14174952
M3 - Article
AN - SCOPUS:85114087068
SN - 1996-1944
VL - 14
JO - Materials
JF - Materials
IS - 17
M1 - 4952
ER -
