Abstract
In this work, N-doped Multi-Walled Carbon Nanotubes (MWCNTs) and Few Graphene Layers (FGLs) have been functionalized with platinum nanoparticles using two methods starting with hexachloroplatinic acid as precursor: (i) ethylene glycol (EG) reduction and (ii) impregnation followed by reduction in hydrogen atmosphere. Morphological scanning transmission electron microscopy (STEM) analyses showed a homogenous dispersion of metal particles with narrow-size distribution onto both carbon supports (Pt/C loadings between 30 wt % and 40 wt %). Electrocatalytic properties of the as-synthetized catalysts toward the Oxygen Reduction Reaction (ORR) was evaluated in aqueous electrolyte using a three electrodes electrochemical cell by cyclic voltammetry (CV) in rotating disk electrode (RDE). It is shown that a mixture of Pt supported on MWCNT and FGLs allows to enhance both the electrochemical surface area and the activity of the catalyst layer. Ageing tests performed on that optimized active layer showed higher stability than conventional Pt/C.
Highlights
The development of energy storage and conversion technologies has been intensified in recent years
We investigated the properties of 2D Few Graphene Layers (FGLs)/1D Multi-Walled Carbon Nanotubes (MWCNTs) Pt catalysts for electrocatalysis of oxygen reduction
For carbon nanotubes support (Figure 1a,b), a large number of Pt NPs are distributed on tube walls quite uniformly and do not aggregate to form larger clusters, indicating a strong interaction between CNTs support and particles
Summary
The development of energy storage and conversion technologies has been intensified in recent years. Polymer Electrolyte Membrane Fuel Cells (PEMFC), which convert the energy of a fuel such as hydrogen into electricity and heat has been recognized as an environmentally friendly technology of choice for transport application because of its low operation temperature, high energy efficiency and high power density [1]. The use of platinum based electrocatalysts is mandatory on both anode and cathode sides to significantly accelerate the electrochemical reactions which drive the PEMFC. The cathode especially where the oxygen reduction reaction (ORR) occurred request a non-negligible amount of Pt at the cathode (around 0.4 mgpt /cm of electrode) which makes the technology dependent of that scarce metal [2]. Both the activity and stability of the used catalysts need to be enhanced [3,4]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
