Diffusion driven nanostructuring of metal–organic frameworks (MOFs) for graphene hydrogel based tunable heterostructures: highly active electrocatalysts for efficient water oxidation
| Autor: | Abhisek Majumdar, Abhijit Gogoi, Youngtak Oh, Anirban Sikdar, Uday Narayan Maiti, Soumen Maiti, Chiranjib Gogoi, Pronoy Dutta, Munindra Borah, K. Anki Reddy |
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| Rok vydání: | 2021 |
| Předmět: |
Conductive polymer
Tafel equation Materials science Nanostructure Renewable Energy Sustainability and the Environment Graphene Oxygen evolution Nanotechnology 02 engineering and technology General Chemistry Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences 0104 chemical sciences law.invention law General Materials Science Metal-organic framework 0210 nano-technology |
| Zdroj: | Journal of Materials Chemistry A. 9:7640-7649 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | Exposing the surface states of metal–organic frameworks (MOFs) by tuning the shape and size of their nanostructures is expected to enhance their functionalities in practical applications. Herein, a highly scalable ‘hydrogel–organic interfacial diffusion’ driven approach is utilized for direct growth of metal–organic framework (MOF) nanocrystals over a porous graphene hydrogel framework with fine structural control. Molecular dynamics (MD) simulation of this heterostructure reveals that, two-stage diffusion (hydrogel–organic interfacial and intra-hydrogel) control of organic ligand molecules and their interaction with the graphene surface play key roles in tunable MOF–hydrogel formation. The resulting tri-metallic MOF–hydrogel-hybrid derived porous aerogel exhibits state-of-the-art oxygen evolution reaction (OER) performance metrics with excellent operational stability in alkaline medium. The overpotential required to achieve a current density of 10 mA cm−2 is as low as 255 mV and a small Tafel slope of 44.3 mV dec−1 signifies a very high rate of oxygen evolution reaction. The hydrogel–organic interfacial principle of this material could be applied to produce versatile graphene–MOF heterostructures as well as other diverse functional graphene-gel-nanohybrids (e.g. metal nanoparticles, conducting polymers) with intriguing application prospects. |
| Databáze: | OpenAIRE |
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