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Energy conversion from external fluctuating signals based on asymmetric nanopores

Ramirez, Patricio and Gomez, Vicente and Cervera, Javier and Nasir, Saima and Ali, Mubarak and Ensinger, Wolfgang and Mafe, Salvador (2015):
Energy conversion from external fluctuating signals based on asymmetric nanopores.
In: Nano Energy, Elsevier Science Publishing, pp. 375-382, 16, ISSN 22112855,
[Online-Edition: http://dx.doi.org/10.1016/j.nanoen.2015.07.013],
[Article]

Abstract

Electrical transduction from fluctuating external signals is central to energy conversion based on nanoscale electrochemical devices and bioelectronics interfaces. We demonstrate theoretically and experimentally a significant energy transduction from white noise signals using the electrical rectification of asymmetric nanopores in polymeric membranes immersed in aqueous electrolyte solutions. Load capacitor voltages of the order of 1 V are obtained within times of the order of 1 min by means of nanofluidic diodes which convert zero time-average potentials of amplitudes of the order of 1 V into average net currents. We consider single-nanopore and multipore membranes to show that the conversion processes can be significantly increased by scaling. The results concern a wide range of operating electrolyte concentrations. Because these concentrations dictate the pore resistance, the tuning of the load capacitance to optimize the system response at each concentration is also addressed. Finally, the experimental results are described theoretically by using simple equivalent circuits with a voltage-dependent resistance in series with a load capacitance.

Item Type: Article
Erschienen: 2015
Creators: Ramirez, Patricio and Gomez, Vicente and Cervera, Javier and Nasir, Saima and Ali, Mubarak and Ensinger, Wolfgang and Mafe, Salvador
Title: Energy conversion from external fluctuating signals based on asymmetric nanopores
Language: English
Abstract:

Electrical transduction from fluctuating external signals is central to energy conversion based on nanoscale electrochemical devices and bioelectronics interfaces. We demonstrate theoretically and experimentally a significant energy transduction from white noise signals using the electrical rectification of asymmetric nanopores in polymeric membranes immersed in aqueous electrolyte solutions. Load capacitor voltages of the order of 1 V are obtained within times of the order of 1 min by means of nanofluidic diodes which convert zero time-average potentials of amplitudes of the order of 1 V into average net currents. We consider single-nanopore and multipore membranes to show that the conversion processes can be significantly increased by scaling. The results concern a wide range of operating electrolyte concentrations. Because these concentrations dictate the pore resistance, the tuning of the load capacitance to optimize the system response at each concentration is also addressed. Finally, the experimental results are described theoretically by using simple equivalent circuits with a voltage-dependent resistance in series with a load capacitance.

Journal or Publication Title: Nano Energy
Volume: 16
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Nanopore, Fluctuating signal, Electrical rectification, Energy conversion
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 27 Oct 2015 12:26
Official URL: http://dx.doi.org/10.1016/j.nanoen.2015.07.013
Identification Number: doi:10.1016/j.nanoen.2015.07.013
Funders: We acknowledge the support from the Ministry of Economic Affairs and Competitiveness and FEDER (Project MAT2012-32084) and the Generalitat Valenciana (Project Prometeo/GV/0069).
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