4.6 Article

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

期刊

MATERIALS
卷 14, 期 17, 页码 -

出版社

MDPI
DOI: 10.3390/ma14174952

关键词

graphene; chemical vapor deposition; nitrogen-doping; hydrogen evolution reaction

资金

  1. Romanian Research and Innovation Ministry-Core Program [PN19110205/2019]
  2. Romanian National Authority for Scientific Research & Innovation, Project RESTORE [117/16.09.2016]

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In this study, nitrogen-doped and platinum functionalized three-dimensional graphene foam (3D-GrFoam) were prepared using hydrothermal treatment with different reducing agents. The nitrogen-doped sample showed higher electrochemical activity with 1.8 at % of N, while the platinum-functionalized sample exhibited a lower Tafel value, suggesting their potential for different electrochemical reaction mechanisms. Raman, infrared spectroscopy, and SEM analyses were conducted to understand the structure of the samples.
Three-dimensional graphene foam (3D-GrFoam) is a highly porous structure and sustained lattice formed by graphene layers with sp(2) and sp(3) 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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