A facile synthesis of graphene nanoribbon-quantum dot hybrids and their application for composite electrolyte membrane in direct methanol fuel cells
| Autor: | P. Dhanasekaran, Avanish Shukla, Vijayamohanan K. Pillai, Santoshkumar D. Bhat, N. Nagaraju |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Nanocomposite Graphene General Chemical Engineering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound Direct methanol fuel cell Sulfonate Membrane chemistry Chemical engineering law Quantum dot Nafion Electrochemistry 0210 nano-technology Methanol fuel |
| Zdroj: | Electrochimica Acta. 297:267-280 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2018.11.162 |
| Popis: | In this work, we report the concept of synthesizing graphene nanoribbon-graphene quantum dot (GNR-GQD) hybrids with even grafting of GQD on GNR sheet in a facile single step process under ultrasonication in chlorosulfonic acid. Further, diazotization route is followed for the preparation of 4-benzenediazonium sulfonate precursor to sulfonate both GNR and GQD to form sulfonated graphene nanoribbons-sulfonated graphene quantum dots (sGNR-sGQD) nanohybrids. Synergistic and structure dependent effect of nanohybrids is seen via its dispersion in sulfonated poly(ether ether ketone) (sPEEK) to form nanocomposite membrane. sPEEK/sGNR-sGQD (1.5 wt %) nanocomposite membrane shows remarkable direct methanol fuel cell (DMFC) performance compared to pristine sPEEK and Nafion 117 with 40% increment in peak power density along with higher durability up to 100 h due to better physicochemical properties like water uptake, ion exchange capacity, proton conductivity, and reduced methanol crossover to suggest its potential which includes diverse membrane applications. |
| Databáze: | OpenAIRE |
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