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3D Printed Electrodes for Efficient Membrane Capacitive Deionization

Abstract

There is an increasing interest for cost-effective and energy-efficient technologies for desalination of salt water. However, scalability of suitable compositions’ electrodes has greatly hindered the development of Capacitive deionization (CDI) as a promising technology in desalination of brackish water. Herein, we introduce a 3D printing technology as a new route to fabricate electrodes with adjustable composition which enables large-scale applications as free-standing, binder free, and robust electrodes. The 3D printed electrodes are designed with ordered macro-channels which facilitate the effective ions diffusion. The high salt removal capacity of 75 mg g-1 was achieved for Membrane Capacitive Deionization (MCDI) using 3D printed Nitrogen-doped graphene oxide/ Carbon nanotube electrodes. The improved mechanical stability and strong bonding of the chemical components in the electrodes allow a long cycle lifetime for the MCDI devices. The adjusted operational mode (current density) enables low energy consumption of 0.331 Whg-1 and high energy recovery of ~ 27%. Furthermore, the results from finite element simulations of the ions diffusion behavior quantified the structure-function relationships of CDI electrodes.

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Publication details

The article was received on 16 Aug 2019, accepted on 07 Oct 2019 and first published on 08 Oct 2019


Article type: Paper
DOI: 10.1039/C9NA00507B
Nanoscale Adv., 2019, Accepted Manuscript
  • Open access: Creative Commons BY license
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    3D Printed Electrodes for Efficient Membrane Capacitive Deionization

    S. Vafakhah, X. Li, G. Sim Joey, M. saeedikhani, P. Valdivia y Alvarado and H. Y. Yang, Nanoscale Adv., 2019, Accepted Manuscript , DOI: 10.1039/C9NA00507B

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