Super-capacitors interfaced with quantum dots at the electrolyte/electrode interface: capacitance gain and fluorescence line-width narrowing
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866911115870470144 |
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| author | Grebel, H. |
| author_facet | Grebel, H. |
| contents | Quantum dots (QDs), embedded in supercapacitors (S-C) cells exhibited capacitance amplification that peaked at certain QD concentration. More than 2.5 peak amplification was demonstrated with cyclic voltammetry (C-V) at a scan rate of 0.1 V/s. The mass ratio of the dots to that of the active-carbon electrode (A-C) was less than 1:5000. Fluorescence signals from dry (without electrolyte) and wet (with electrolyte) samples, exhibited a correlated, substantial peak enhancement vs QD concentration, as well. In the case of wet samples, fluorescence line narrowing was demonstrated, which indicates a substantial fluorescence gain. Both effects are attributed to local field effects through formation of a colloidal array at the electrode/electrolyte interface. Embedding QDs at the electrolyte/electrode interface has an added value that it may be further enhanced by white light and indeed this is the case here. Probing the electrolyte/electrode interface with fluorescing materials adds to our basic knowledge of the interface and could be useful for light-sensitive S-C cells. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_16791 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Super-capacitors interfaced with quantum dots at the electrolyte/electrode interface: capacitance gain and fluorescence line-width narrowing Grebel, H. Chemical Physics Applied Physics Quantum dots (QDs), embedded in supercapacitors (S-C) cells exhibited capacitance amplification that peaked at certain QD concentration. More than 2.5 peak amplification was demonstrated with cyclic voltammetry (C-V) at a scan rate of 0.1 V/s. The mass ratio of the dots to that of the active-carbon electrode (A-C) was less than 1:5000. Fluorescence signals from dry (without electrolyte) and wet (with electrolyte) samples, exhibited a correlated, substantial peak enhancement vs QD concentration, as well. In the case of wet samples, fluorescence line narrowing was demonstrated, which indicates a substantial fluorescence gain. Both effects are attributed to local field effects through formation of a colloidal array at the electrode/electrolyte interface. Embedding QDs at the electrolyte/electrode interface has an added value that it may be further enhanced by white light and indeed this is the case here. Probing the electrolyte/electrode interface with fluorescing materials adds to our basic knowledge of the interface and could be useful for light-sensitive S-C cells. |
| title | Super-capacitors interfaced with quantum dots at the electrolyte/electrode interface: capacitance gain and fluorescence line-width narrowing |
| topic | Chemical Physics Applied Physics |
| url | https://arxiv.org/abs/2507.16791 |