المؤلفون: Jingmin Zhou, Gang Jing, Teng Zhao, Fengrui Tian, Xiaofei Xu, Shuangliang Zhao

مصطلحات موضوعية: Molecular Biology, Physiology, Ecology, Space Science, Biological Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, optimal operating condition, low operation voltages, 94 – 14, unraveling flow effect, engineered energy extraction, energy extraction enhancement, salinity gradient energy, regulating ion adsorption, 69 – 49, water flow velocity, capacitive energy extraction, surface charge density, high water flows, energy extraction, energy density, water flows, ion adsorption, water flow, high flow, output energy, salinity gradients, capacitive double, flow effects

الوصف: The harvesting of salinity gradient energy through a capacitive double-layer expansion (CDLE) technique is directly associated with ion adsorption and desorption in electrodes. Herein, we show that energy extraction can be modulated by regulating ion adsorption/desorption through water flow. The flow effects on the output energy, capacitance, and energy density under practical conditions are systematically investigated from a theoretical perspective, upon which the optimal operating condition is identified for energy extraction. We demonstrate that the net charge accumulation displays a negative correlation with the water flow velocity and so does the surface charge density, and this causes a nontrivial variation in the magnitude of output energy when water flows are introduced. When high water flows are introduced in both the charging and discharging processes, the energy extraction can be significantly reduced by 47.69–49.32%. However, when a high flow is solely exerted in the discharging process, the energy extraction can be enhanced by 12.94–14.49% even at low operation voltages. This study not only offers a comprehensive understanding of the microscopic mechanisms of surface-engineered energy extraction with water flows but also provides a novel direction for energy extraction enhancement.

العلاقة: https://figshare.com/articles/journal_contribution/Unraveling_Flow_Effect_on_Capacitive_Energy_Extraction_from_Salinity_Gradients/25238309Test

الإتاحة: https://doi.org/10.1021/acsami.3c16738.s001Test
https://figshare.com/articles/journal_contribution/Unraveling_Flow_Effect_on_Capacitive_Energy_Extraction_from_Salinity_Gradients/25238309Test

المؤلفون: Zou, Zhi, Liu, Longcheng, Meng, Shuo, Bian, Xiaolei

المصدر: Energy Reports. 8:7325-7335

مصطلحات موضوعية: Salinity gradient energy, Capacitive energy extraction, Double layer expansion, CDLE, CDP

الوصف: Capacitive mixing (CapMix) is a renewable method of extracting energy from the salinity difference between seawater and freshwater. In this study, we systematically investigate the system behavior and performance of the CapMix system under four operational modes namely, capacitive energy extraction based on double layer expansion (CDLE), capacitive energy extraction based on the Donnan potential (CDP), and CDP with additional charging of constant voltage (CDP-CV) and constant current (CDPCC). The results indicate that the application of additional charging in the CDP technique can break the limits of the Donnan potential and significantly improve the system's performance. Accordingly, in terms of energy production and average power density, CDP-CC and CDP-CV are the two superior operational modes, followed by CDP and CDLE. In addition, our results reveal that CDP-CC is determined by the accumulated charge and applied current. CDLE is dependent on the applied voltage, while CDPCV is not sensitive to the applied voltage. Increasing the external load can considerably increase the energy production of both CDLE and CDP. In summary, the findings in this study provide practical information for the optimization and application of CapMix technologies.

وصف الملف: print

الوصول الحر: https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-316716Test
https://doi.org/10.1016/j.egyr.2022.05.245Test

المؤلفون: Zhi Zou, Longcheng Liu, Shuo Meng, Xiaolei Bian

المصدر: Energy Reports, Vol 8, Iss , Pp 7325-7335 (2022)

مصطلحات موضوعية: Salinity gradient energy, Capacitive energy extraction, Double layer expansion, CDLE, CDP, Electrical engineering. Electronics. Nuclear engineering, TK1-9971

الوصف: Capacitive mixing (CapMix) is a renewable method of extracting energy from the salinity difference between seawater and freshwater. In this study, we systematically investigate the system behavior and performance of the CapMix system under four operational modes namely, capacitive energy extraction based on double layer expansion (CDLE), capacitive energy extraction based on the Donnan potential (CDP), and CDP with additional charging of constant voltage (CDP-CV) and constant current (CDP-CC). The results indicate that the application of additional charging in the CDP technique can break the limits of the Donnan potential and significantly improve the system’s performance. Accordingly, in terms of energy production and average power density, CDP-CC and CDP-CV are the two superior operational modes, followed by CDP and CDLE. In addition, our results reveal that CDP-CC is determined by the accumulated charge and applied current. CDLE is dependent on the applied voltage, while CDP-CV is not sensitive to the applied voltage. Increasing the external load can considerably increase the energy production of both CDLE and CDP. In summary, the findings in this study provide practical information for the optimization and application of CapMix technologies.

وصف الملف: electronic resource

العلاقة: http://www.sciencedirect.com/science/article/pii/S2352484722010915Test; https://doaj.org/toc/2352-4847Test

الوصول الحر: https://doaj.org/article/9df539f385ad450a96d23fd705e622eeTest

المؤلفون: Zou, Zhi, 1989, Li, Chunguang, Meng, Shuo, Bian, Xiaolei, Liu, Longcheng

المصدر: Journal of Energy Storage. 73:109031

مصطلحات موضوعية: Blue energy, Capacitive energy extraction, CapMix, F-CapMix, Flow electrode, Salinity gradient energy

الوصف: In recent years, Capacitive Mixing (CapMix) has garnered growing interest as a novel method for harnessing energy from the salinity gradient between seawater and freshwater. However, the challenge of extracting energy in a continuous way remains to be solved in traditional CapMix system. In this study, we demonstrate the feasibility of achieving continuous energy extraction through the use of a two-cell flow electrode Capacitive Mixing (F-CapMix) system. The performance of the F-CapMix system is evaluated under various experimental conditions including the activated carbon loading, carbon black additives, velocity of the flow electrode and feed water and external resistance in the circuit. The results suggest that the power density of the system can be significantly increased by approximately 800 % or 400 % with an increase in the carbon loading or the addition of carbon black additives, respectively. Meanwhile, reducing the flow rate of the flow electrode and feedwater from 20 mL/s to 5 mL/s was found to improve the system's performance. In addition, it is crucial that the external resistance is matched to the internal resistance of the cell for achieving a maximum power density. These results highlight the potential of F-CapMix and provide guidance for its further optimization.

وصف الملف: print

الوصول الحر: https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-337413Test
https://doi.org/10.1016/j.est.2023.109031Test

المؤلفون: Iglesias Salto, Guillermo Ramón, Fernández, M. Mar, Ahualli Yapur, Silvia Alejandra, Jiménez Olivares, María Luisa, Kozynchenko, Oleksander P., Delgado Mora, Ángel Vicente

مصطلحات موضوعية: Activated carbon particles, Capacitive energy extraction, Double layer expansion, Pore size distribution, Supercapacitors, Wettability

الوصف: NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Power Sources. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Power Sources (2014) DOI:http://dx.doi.org/10.1016/j.jpowsour.2013.12.125Test ; The capacitive mixing procedure for energy extraction based on Double Layer Expansion (CDLE) belongs to the group of so-called CAPMIX techniques, which aim at obtaining energy from the salinity difference between fresh and sea waters. Specifically, the CDLE technique takes advantage of the voltage rise that occurs when sea water is exchanged for river water in a pair of porous electrodes which jointly behave as an electrical double layer supercapacitor. In this article, we deal with some experimental aspects that are key for optimizing the extracted energy, and have not been analyzed yet with sufficient detail. This investigation will help in evaluating those parameters which we need to be fixed in a future CDLE device. These include the charging potential, the durations of the different cycle steps, the load resistance used, and the porosity and hydrophilicity of the carbon. ; Departamento de Física Aplicada, Universidad de Granada ; The research leading to these results received funding from the European Union 7th Framework Programme (FP7/2007-2013) under agreement No. 256868. Further financial support from Junta de Andalucía (Spain), project PE-2008-FQM3993 is also gratefully acknowledged.

العلاقة: info:eu-repo/grantAgreement/EC/FP7/256868; Iglesias, G.R; et al. Materials selection for optimum energy production by double layer expansion methods. Journal of Power Sources, (2014). [http://hdl.handle.net/10481/31503Test]; http://hdl.handle.net/10481/31503Test

الإتاحة: https://doi.org/10.1016/j.jpowsour.2013.12.125Test
http://hdl.handle.net/10481/31503Test

المؤلفون: Rica, R, BROGIOLI, DORIANO COSTANTINO, ZIANO, ROBERTO, SALERNO, DOMENICO, MANTEGAZZA, FRANCESCO

المساهمون: Rica, R, Brogioli, D, Ziano, R, Salerno, D, Mantegazza, F

مصطلحات موضوعية: Capacitive energy extraction from salinity difference

الوصف: A model of the electro-diffusion of ions in porous electrodes is applied to analyze the dynamics of capacitive-mixing extraction of energy from salinity gradients with carbon porous electrodes. The complex time-evolution of the cell voltage observed in experiments is satisfactorily described. The asymmetry on the duration of the solution-change steps performed in open circuit is found to be due to the nonlinear voltage-concentration relationship of the electric double layers and to a current that redistributes the counterions along the depth of the electrode leading to nonuniform charge and salt adsorption. The validated model is an essential tool for the design and optimization of renewable energy extraction by this technique. © 2012 American Chemical Society.

العلاقة: info:eu-repo/semantics/altIdentifier/pmid/24319518; info:eu-repo/semantics/altIdentifier/wos/WOS:000307494600016; volume:116; issue:32; firstpage:16934; lastpage:16938; numberofpages:5; journal:JOURNAL OF PHYSICAL CHEMISTRY. C; http://hdl.handle.net/10281/36548Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84865125067

الإتاحة: https://doi.org/10.1021/jp3059849Test
http://hdl.handle.net/10281/36548Test

المؤلفون: Ahualli Yapur, Silvia Alejandra, Fernández, M. Mar, Iglesias Salto, Guillermo Ramón, Jiménez Olivares, María Luisa, Liu, Fei, Vagterfeld, Martijn, Delgado Mora, Ángel Vicente

مصطلحات موضوعية: Activated carbon particles, Blue energy, Capacitive energy extraction, Donnan potential, Ionic exchange membranes, Multivalent solutions

الوصف: The final edited version of the paper can be found at: http://pubs.acs.org/articlesonrequest/AOR-c9UMxSzGY3eiU5SENNgTTest The complete citation is: Ahualli, S.; et al. Effect of Solution Composition on the Energy Production by Capacitive Mixing in Membrane-Electrode Assembly. Journal of Physical Chemistry, 118(29): 15590-15599 (2014). DOI:10.1021/jp504461m ; Open access in the Journal on May 26, 2015 ; In this work we consider the extent to which the presence of multi-valent ions in solution modifies the equilibrium and dynamics of the energy production in a capacitive cell built with ion-exchange membranes in contact with high surface area electrodes. The cell potential in open circuit (OCV) is controlled by the difference between both membrane potentials, simulated as constant volume charge regions. A theoretical model is elaborated for steady state OCV, first in the case of monovalent solutions, as a reference. This is compared to the results in multi-ionic systems, containing divalent cations in concentrations similar to those in real sea water. It is found that the OCV is reduced by about 25 % (as compared to the results in pure NaCl solutions) due to the presence of the divalent ions, even in low concentrations. Interestingly, this can be related to the “uphill” transport of such ions against their concentration gradients. On the contrary, their effect on the dynamics of the cell potential is negligible in the case of highly charged membranes. The comparison between model predictions and experimental results shows a very satisfactory agreement, and gives clues for the practical application of these recently introduced energy production methods. ; The research leading to these results received funding from the European Union 7th Framework Programme (FP7/2007-2013) under agreement No. 256868. Further financial support from Junta de Andalucia, Spain (PE2012-FQM 694) is also acknowledged. One of us, M.M.F., received financial support throughan FPU grant from the Universityof Granada.

العلاقة: info:eu-repo/grantAgreement/EC/FP7/256868; http://hdl.handle.net/10481/33063Test

الإتاحة: https://doi.org/10.1021/jp504461mTest
http://hdl.handle.net/10481/33063Test

المؤلفون: María L. Jiménez, Silvia Ahualli, Guillermo R. Iglesias, Ángel V. Delgado, Oleksander P. Kozynchenko, María M. Fernández

المصدر: Journal of Power Sources
Digibug. Repositorio Institucional de la Universidad de Granada
instname

مصطلحات موضوعية: Materials science, Capacitive sensing, Mixing (process engineering), Energy Engineering and Power Technology, Capacitive energy extraction, Nanotechnology, 02 engineering and technology, 010402 general chemistry, 7. Clean energy, 01 natural sciences, Double layer expansion, Supercapacitors, Extraction (military), Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Process engineering, Porosity, Supercapacitor, Renewable Energy, Sustainability and the Environment, business.industry, Pore size distribution, 021001 nanoscience & nanotechnology, 6. Clean water, 0104 chemical sciences, Wettability, Seawater, 0210 nano-technology, business, Energy (signal processing), Voltage, Activated carbon particles

الوصف: NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Power Sources. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Power Sources (2014) DOI:http://dx.doi.org/10.1016/j.jpowsour.2013.12.125Test
The capacitive mixing procedure for energy extraction based on Double Layer Expansion (CDLE) belongs to the group of so-called CAPMIX techniques, which aim at obtaining energy from the salinity difference between fresh and sea waters. Specifically, the CDLE technique takes advantage of the voltage rise that occurs when sea water is exchanged for river water in a pair of porous electrodes which jointly behave as an electrical double layer supercapacitor. In this article, we deal with some experimental aspects that are key for optimizing the extracted energy, and have not been analyzed yet with sufficient detail. This investigation will help in evaluating those parameters which we need to be fixed in a future CDLE device. These include the charging potential, the durations of the different cycle steps, the load resistance used, and the porosity and hydrophilicity of the carbon.
Departamento de Física Aplicada, Universidad de Granada
The research leading to these results received funding from the European Union 7th Framework Programme (FP7/2007-2013) under agreement No. 256868. Further financial support from Junta de Andalucía (Spain), project PE-2008-FQM3993 is also gratefully acknowledged.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9fcd475b67d1210ed38b101f2a8fbdd7Test

المؤلفون: Iglesias Salto, Guillermo Ramón, Ahualli Yapur, Silvia Alejandra, Fernández, M. Mar, Jiménez Olivares, María Luisa, Delgado Mora, Ángel Vicente

مصطلحات موضوعية: Activated carbon particles, Capacitive energy extraction, Double layer expansion, Supercapacitors, Soft electrodes, Series capmix association

الوصف: Publisher's link: http://www.sciencedirect.com/science/article/pii/S0378775316303676?np=yTest ; Ha estado embargado durante 1 año, hasta julio 2017 ; In this paper we explore methods for stacking individual cells in order to increase the amount of energy that can be extracted from salinity gradient cycles (capmix methods). Each of the cells consists of a pair of parallel electrodes made of activated carbon particles, either bare or coated by a layer of polyelectrolyte. In these methods, energy is produced based on the modifications in the electrical double layer (EDL) structure in the pores of the carbon particles upon exchange of the salinity of the surrounding medium. In the case of the bare carbon particles, the electrodes are externally charged in presence of high-salt concentration, and discharged after exchanging the solution for a dilute one (sea- vs. river-water cycles). In a first stacking approach, we simply connect the electrodes side-by-side and only the outermost ones can be connected to the external source. Using a stack where potential and current between cells can be measured, it is shown that only the external electrodes seem to work, and it is suggested that this is a consequence of internal short-circuit currents between oppositely charged electrodes of different cells through the electrolyte. In contrast, the side-by-side configuration is operational if coated electrodes are used. ; MICINN, Spain (Project FIS2013-47666-C3-1R) ; RYC-2014-16901 (MINECO) ; FEDER Funds EU

العلاقة: Guillermo;1/2016; Iglesias, G.R.; et al. Stacking of capacitive cells for electrical energy production by salinity exchange. Journal of Power Sources, 318: 283-290 (2016). [http://hdl.handle.net/10481/41031Test]; http://hdl.handle.net/10481/41031Test

الإتاحة: https://doi.org/10.1016/j.jpowsour.2016.04.026Test
http://hdl.handle.net/10481/41031Test

المؤلفون: Silvia Ahualli, Guillermo R. Iglesias, María L. Jiménez, Ángel V. Delgado, María M. Fernández

مصطلحات موضوعية: Capacitive sensing, Stacking, Analytical chemistry, Energy Engineering and Power Technology, Capacitive energy extraction, 02 engineering and technology, Electrolyte, 010501 environmental sciences, 01 natural sciences, Stack (abstract data type), Double layer expansion, Supercapacitors, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Series capmix association, 0105 earth and related environmental sciences, Soft electrodes, Supercapacitor, Renewable Energy, Sustainability and the Environment, Chemistry, 021001 nanoscience & nanotechnology, Polyelectrolyte, Chemical engineering, Electrode, 0210 nano-technology, Layer (electronics), Activated carbon particles

الوصف: Publisher's link: http://www.sciencedirect.com/science/article/pii/S0378775316303676?np=yTest
Ha estado embargado durante 1 año, hasta julio 2017
In this paper we explore methods for stacking individual cells in order to increase the amount of energy that can be extracted from salinity gradient cycles (capmix methods). Each of the cells consists of a pair of parallel electrodes made of activated carbon particles, either bare or coated by a layer of polyelectrolyte. In these methods, energy is produced based on the modifications in the electrical double layer (EDL) structure in the pores of the carbon particles upon exchange of the salinity of the surrounding medium. In the case of the bare carbon particles, the electrodes are externally charged in presence of high-salt concentration, and discharged after exchanging the solution for a dilute one (sea- vs. river-water cycles). In a first stacking approach, we simply connect the electrodes side-by-side and only the outermost ones can be connected to the external source. Using a stack where potential and current between cells can be measured, it is shown that only the external electrodes seem to work, and it is suggested that this is a consequence of internal short-circuit currents between oppositely charged electrodes of different cells through the electrolyte. In contrast, the side-by-side configuration is operational if coated electrodes are used.
MICINN, Spain (Project FIS2013-47666-C3-1R)
RYC-2014-16901 (MINECO)
FEDER Funds EU

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9d8b84456575e30f45d9d2ff00f926f2Test
http://hdl.handle.net/10481/41031Test