Nitrogen Functionalization of CVD Grown Three-Dimensional Graphene Foam for Hydrogen Evolution Reactions in Alkaline Media

Three-dimensional graphene foam (3D-GrFoam) is a highly porous structure and sustained 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...

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Published inMaterials Vol. 14; no. 17; p. 4952
Main Authors Ion-Ebrașu, Daniela, Andrei, Radu Dorin, Enache, Stanică, Căprărescu, Simona, Negrilă, Constantin Cătălin, Jianu, Cătălin, Enache, Adrian, Boerașu, Iulian, Carcadea, Elena, Varlam, Mihai, Vasile, Bogdan Ștefan, Ren, Jianwei
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 30.08.2021
MDPI
Subjects
Ammonia
Carbon
Chemical vapor deposition
Electrolytes
Energy
Gases
Graphene
Hybridization
Hydrazines
Hydrochloric acid
Hydrogen
Hydrogen evolution reactions
Hydrothermal treatment
Infrared analysis
Infrared spectroscopy
Nitrogen
Photoelectrons
Platinum
Reducing agents
Renewable resources
Spectrum analysis
Voltammetry
X ray photoelectron spectroscopy
Germany
Romania
chemical vapor deposition
graphene
nitrogen-doping
hydrogen evolution reaction
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Summary:Three-dimensional graphene foam (3D-GrFoam) is a highly porous structure and sustained 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. Furthermore, Raman and infrared spectroscopy analysis, as well as scanning electron microscopy (SEM) were carried out to understand the structure of the samples.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma14174952