Graphene Supported Rhodium Nanoparticles for Enhanced Electrocatalytic Hydrogen Evolution Reaction
Ameerunisha Begum1, Moumita Bose2, Golam Moula2
1Department of Chemistry, Faculty of Science, Jamia Hamdard University, New Delhi, 110062, India. abegum@jamiahamdard.ac.in.
Scientific Reports
|November 21, 2019
Summary
Researchers developed new nanoparticle catalysts, Rhodium Nanoparticles (RhNPs) and RhNPs@functionalized graphene (f-graphene), for hydrogen gas production. These catalysts demonstrate superior performance and stability compared to platinum, offering a sustainable alternative for fuel cell applications.
Area of Science:
- Materials Science and Engineering
- Electrochemistry
- Nanotechnology
Background:
- Current proton exchange membrane fuel cell (PEMFC) catalysts, primarily platinum-based, face challenges in activity and sustainability.
- There is a critical need for alternative, cost-effective, and efficient catalysts for hydrogen gas evolution.
Purpose of the Study:
- To synthesize and characterize transition metal nanoparticles (NPs) and their composites with functionalized graphene as potential catalysts.
- To evaluate the electrocatalytic activity and stability of these novel materials for hydrogen gas production from acidic water.
Main Methods:
- Synthesis of transition metal nanoparticles (Rh, Co, Fe, Pt) and their composites with functionalized graphene (f-graphene).
- Characterization using Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM).
- Electrocatalytic evaluation for hydrogen gas evolution in p-toluene sulphonic acid (p-TsOH) solution.
Main Results:
- Rhodium Nanoparticles (RhNPs) and RhNPs@f-graphene exhibited superior catalytic activity for hydrogen evolution compared to platinum-based catalysts (PtNPs@f-graphene, PtNPs).
- RhNPs@f-graphene showed a lower onset reduction potential (Ep, -0.117 V) than PtNPs@f-graphene (Ep, -0.380 V).
- The RhNPs and RhNPs@f-graphene catalysts demonstrated excellent stability and recyclability over multiple catalytic cycles.
Conclusions:
- Rhodium-based nanomaterials, particularly RhNPs@f-graphene, represent promising, sustainable alternatives to platinum catalysts for hydrogen production.
- The enhanced catalytic performance is attributed to the unique properties of rhodium nanoparticles dispersed on functionalized graphene.
- Further investigation into the catalytic mechanism involving a hydridic species (Rh-H-) is warranted.
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