Microporous MOF as nanogen facilitating diffusion-coupled charge transfer near the percolation threshold in a polyaniline pseudo-supercapacitor
| Autor: | Worood A. El-Mehalmey, Rana R. Haikal, Aya Mohamed Ali, Mady Elbahri, Mohamed H. Alkordi, Ahmed B. Soliman |
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| Přispěvatelé: | Zewail City of Science and Technology, Department of Chemistry and Materials Science, Aalto-yliopisto, Aalto University |
| Rok vydání: | 2022 |
| Předmět: |
Supercapacitor
Materials science ELECTRODE SURFACE Percolation threshold Charge (physics) Microporous material PERFORMANCE CARBON NANOTUBES NANOCOMPOSITES OPPORTUNITIES METAL-ORGANIC FRAMEWORKS chemistry.chemical_compound chemistry Chemistry (miscellaneous) Chemical physics Polyaniline COMPOSITES General Materials Science POLYMERS Diffusion (business) NANOFIBERS |
| Zdroj: | Materials Advances. 3:474-483 |
| ISSN: | 2633-5409 |
| Popis: | Several approaches have recently been investigated with the aim of enhancing the specific capacitance of polyaniline (PANI). We herein report a novel pathway to boost the specific capacitance of PANI, which is highly tunable and versatile, based on wet chemistry techniques. In this approach, utilization of a specific metal-organic framework (MOF), UiO-66-NH2, as a nanopore generator (Nanogen) is demonstrated. This systematic study demonstrates a tight interplay between the enhanced electrolyte accessibility to the PANI chains, through the incorporation of MOF nanogens, and the optimal relative amount of the conductive PANI, necessary to attain a charge percolation threshold in the binary system (MOF@PANI). Satisfying the charge percolation while maintaining porosity is necessary to arrive at a maximized specific capacitance of the PANI as the active phase. The enhancement in the specific capacitance of the PANI was fully exploited through a systematic investigation that helped to pinpoint the saddle point at which the two orthogonal properties, namely porosity (electrolyte diffusivity) and charge mobility (PANI inter-chain electronic conductivity) can be fine-tuned via controlling the materials composition. Of the different compositions investigated, the composite containing 23 wt% PANI of the total weight, doped with MOF nanogens, resulted in an enhanced specific capacitance of 872 F g-1 for the PANI, in comparison to only 469 F g-1 for the pristine PANI investigated under identical conditions. |
| Databáze: | OpenAIRE |
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