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Jing G, Qiu G, Xu X, Zhao S. Boosting Salinity Energy Extraction Efficiency in Capacitive Mixing by Polyelectrolyte Surface Coating. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:8162-8169. [PMID: 38578051 DOI: 10.1021/acs.langmuir.4c00233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
The extraction of salinity gradient energy in the capacitive mixing (CapMix) technique can be enhanced by using polyelectrolyte-coated electrodes. The micromechanism of polyelectrolyte (PE) coating enhancing the salinity energy extraction is studied by using a statistical thermodynamic theory. When PE takes same charge sign as the coated electrodes, the extraction efficiency can be boosted owing to the enhanced response of electrical double layer (EDL) to external cell voltage (V0). For the optimal case studied, the extraction efficiency was boosted from 0.25 to 1.25% by PE coatings. Owing to counterion adsorption and the enhanced response of EDL, the extraction energy density presented a local maximum at V0 = 0, which is higher than another local maximum value when V0 ≠ 0. This provides important guidance on the two approaches of CapMix in terms of capacitive Donnan potential (CDP, V0 = 0) and capacitive double-layer expansion (CDLE, V0 ≠ 0). Under the effects of PE coating, the extraction efficiency by CDLE can be improved to about 11% by CDP for the optimal studied case. The synergistic effect of grafting conditions can significantly elevate the energy density and extraction efficiency of the CDP process.
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Affiliation(s)
- Gang Jing
- State Key Laboratory of Chemical Engineering and School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Genlong Qiu
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology and School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Xiaofei Xu
- State Key Laboratory of Chemical Engineering and School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Shuangliang Zhao
- State Key Laboratory of Chemical Engineering and School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology and School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
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Mo T, Peng J, Dai W, Chen M, Presser V, Feng G. Horn-like Pore Entrance Boosts Charging Dynamics and Charge Storage of Nanoporous Supercapacitors. ACS NANO 2023. [PMID: 37498344 DOI: 10.1021/acsnano.3c03886] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/28/2023]
Abstract
Optimizing the synergy between nanoporous carbons and ionic liquids can significantly enhance the energy density of supercapacitors. The highest energy density has been obtained as the size of porous carbon matches the size of ionic liquids, while it may result in slower charging dynamics and thus reduce the power density. Enhancing energy storage without retarding charging dynamics remains challenging. Herein, we designed porous electrodes by introducing an optimized horn-like entrance to the nanopore, which can concurrently improve supercapacitors' charging dynamics and energy storage. Our results revealed the mechanism of improved charging lies in the gradual desolvation process and optimized ion motion paths: the former expedites the adsorption of the counterion by reducing the transitional energy barrier for ions entering the pores, and the latter accelerates the co-ion desorption and eliminates ion overfilling. Meanwhile, the enhancement of energy density could be attributed to the multi-ion coordinated migration.
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Affiliation(s)
- Tangming Mo
- School of Mechanical Engineering, Guangxi University, Nanning, Guangxi 530004, China
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China
| | - Jiaxing Peng
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China
| | - Wenlei Dai
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China
| | - Ming Chen
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China
| | - Volker Presser
- INM - Leibniz Institute for New Materials, Campus D22, 66123 Saarbrücken, Germany
- Department of Materials Science and Engineering, Saarland University, Campus D22, 66123 Saarbrücken, Germany
- Saarland Center for Energy Materials and Sustainability, Campus C42, 66123 Saarbrücken, Germany
| | - Guang Feng
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China
- Institute of Interdisciplinary Research for Mathematics and Applied Science, HUST, Wuhan, Hubei 430074, China
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Li Y, Gao Q, Xu X, Li P, Zhao S. Solvent-evolution-coupled single ion diffusion into charged nanopores. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Long T, Wu H, Qiao C, Bao B, Zhao S, Liu H. Nonnegligible nano-confinement effect on solvent-mediated interactions between nanoparticles. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2021.117238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Yu H, Wang Z, Long T, Li Y, Thushara D, Bao B, Zhao S. Permeability and Selectivity Analysis for Affinity‐based Nanoparticle Separation through Nanochannels. AIChE J 2022. [DOI: 10.1002/aic.17583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hongping Yu
- State Key Laboratory of Chemical Engineering and School of Chemical Engineering East China University of Science and Technology Shanghai People's Republic of China
| | - Zhichao Wang
- State Key Laboratory of Chemical Engineering and School of Chemical Engineering East China University of Science and Technology Shanghai People's Republic of China
| | - Ting Long
- State Key Laboratory of Chemical Engineering and School of Chemical Engineering East China University of Science and Technology Shanghai People's Republic of China
| | - Yu Li
- State Key Laboratory of Chemical Engineering and School of Chemical Engineering East China University of Science and Technology Shanghai People's Republic of China
| | - Dilantha Thushara
- Department of Chemical and Process Engineering University of Moratuwa Moratuwa Sri Lanka
| | - Bo Bao
- State Key Laboratory of Chemical Engineering and School of Chemical Engineering East China University of Science and Technology Shanghai People's Republic of China
| | - Shuangliang Zhao
- State Key Laboratory of Chemical Engineering and School of Chemical Engineering East China University of Science and Technology Shanghai People's Republic of China
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology and School of Chemistry and Chemical Engineering Guangxi University Nanning People's Republic of China
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