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Hybrid MXene/reduced graphene oxide aerogel microspheres for hydrogen evolution reaction
- Source :
- Ionics. 27:3099-3108
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- Hybrid MXene/reduced graphene oxide aerogel microspheres (MXene/rGOAMs),where MXenes are two-dimensional (2D) transition metal carbides, with abundant macro/meso/micro multi-scale pores and self-supporting structure, are prepared by electrospraying followed by freeze-drying and then thermal annealing. A center-diverging structure with well-aligned microchannels is formed within each microsphere, which can be maintained after thermal reduction. Such highly ordered 3D hybrid mesoporous network has been tested for the hydrogen evolution reaction (HER) because it may prevent the stacking of the 2D layers, thus enhancing the mass transfer. Actually, in the case of Ti3C2Tx/rGOAMs, obtained with an optimized MXene:GO mass ratio and after a thermal treatment at 400 °C, a better HER performance with respect to the bulk Ti3C2Tx aerogel or the MXene/GO composite is observed (η10=-336 mV), suggesting an accelerated mass transfer through different inter-sheets when the 3D mesoporous microsphere networks are created. The Ti3C2Tx/rGOAMs also exhibit enhanced HER activity compared to rGOAMs, suggesting that the MXene plays a key role due to the presence of titanium atoms with a low valence state.
- Subjects :
- Materials science
General Chemical Engineering
Composite number
Oxide
General Physics and Astronomy
chemistry.chemical_element
02 engineering and technology
Thermal treatment
010402 general chemistry
01 natural sciences
Electrochemical promotion
law.invention
chemistry.chemical_compound
law
General Materials Science
Graphene
Catalyses
Electrochemical characterizations
General Engineering
Aerogel
021001 nanoscience & nanotechnology
0104 chemical sciences
chemistry
Chemical engineering
0210 nano-technology
MXenes
Mesoporous material
Titanium
Subjects
Details
- ISSN :
- 18620760 and 09477047
- Volume :
- 27
- Database :
- OpenAIRE
- Journal :
- Ionics
- Accession number :
- edsair.doi.dedup.....d496a4817eb24375619982b089c43dda