Organic solvent boosts charge storage and charging dynamics of conductive MOF supercapacitors
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arXiv
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| Format: | Preprint |
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2024
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| author | Chen, Ming Wu, Taizheng Niu, Liang Ye, Ting Dai, Wenlei Zeng, Liang Kornyshev, Alexei A. Wang, Zhenxiang Liu, Zhou Feng, Guang |
| author_facet | Chen, Ming Wu, Taizheng Niu, Liang Ye, Ting Dai, Wenlei Zeng, Liang Kornyshev, Alexei A. Wang, Zhenxiang Liu, Zhou Feng, Guang |
| contents | Conductive metal-organic frameworks (c-MOFs) and ionic liquids (ILs) have emerged as auspicious combinations for high-performance supercapacitors. However, the nanoconfinement from c-MOFs and high viscosity of ILs slow down the charging process. This hindrance can, however, be resolved by adding solvent. Here, we performed constant-potential molecular simulations to scrutinize the solvent impact on charge storage and charging dynamics of MOF-IL-based supercapacitors. We find conditions for >100% enhancement in capacity and ~6 times increase in charging speed. These improvements were confirmed by synthesizing near-ideal c-MOFs and developing multiscale models linking molecular simulations to electrochemical measurements. Fundamentally, our findings elucidate that the solvent acts as an ionophobic agent to induce a substantial enhancement in charge storage, and as an ion traffic police to eliminate convoluted counterion and co-ion motion paths and create two distinct ion transport highways to accelerate charging dynamics. This work paves the way for the optimal design of MOF supercapacitors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_01198 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Organic solvent boosts charge storage and charging dynamics of conductive MOF supercapacitors Chen, Ming Wu, Taizheng Niu, Liang Ye, Ting Dai, Wenlei Zeng, Liang Kornyshev, Alexei A. Wang, Zhenxiang Liu, Zhou Feng, Guang Applied Physics Materials Science Conductive metal-organic frameworks (c-MOFs) and ionic liquids (ILs) have emerged as auspicious combinations for high-performance supercapacitors. However, the nanoconfinement from c-MOFs and high viscosity of ILs slow down the charging process. This hindrance can, however, be resolved by adding solvent. Here, we performed constant-potential molecular simulations to scrutinize the solvent impact on charge storage and charging dynamics of MOF-IL-based supercapacitors. We find conditions for >100% enhancement in capacity and ~6 times increase in charging speed. These improvements were confirmed by synthesizing near-ideal c-MOFs and developing multiscale models linking molecular simulations to electrochemical measurements. Fundamentally, our findings elucidate that the solvent acts as an ionophobic agent to induce a substantial enhancement in charge storage, and as an ion traffic police to eliminate convoluted counterion and co-ion motion paths and create two distinct ion transport highways to accelerate charging dynamics. This work paves the way for the optimal design of MOF supercapacitors. |
| title | Organic solvent boosts charge storage and charging dynamics of conductive MOF supercapacitors |
| topic | Applied Physics Materials Science |
| url | https://arxiv.org/abs/2403.01198 |