High salt capacity and high removal rate capacitive deionization enabled by hierarchical porous carbons

Turki N. Baroud, Emmanuel P. Giannelis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

Abstract

Capacitive deionization, CDI, has emerged as an attractive alternative for water desalination. Electrodes based on Hierarchically porous carbons, HPCs, consistently show promising electrosorption performance. However, the typically low mesopore fraction and broad pore size distribution limit their utilization in practical applications. Here we report the CDI performance of a series of HPCs synthesized via ice templation possessing a high fraction of mesopore volume (85–93% of total porosity) and tight control over the amount and the size of mesopores (∼6 nm). Electrochemical measurements indicate high rate capability (82% salt retention) and outstanding cycling stability performance (100% capacitance retention over 600 cycles at 0.76 A g−1). In the CDI experiments, the HPCs display high salt capacity (up to ∼ 13 mg g−1) and consistently outperform other high surface areas commercial carbons. The existence of high fraction of mesoporosities enables better utilization of the accessible surfaces of HPCs where the introduction of micropores leads to more than 80% increase in the salt capacity. The HPCs reported here can serve as model electrode systems in studies to delineate the impact of mesoporosity (pore size and volume) on CDI performance and they may pave the way for practical CDI applications.

Original languageEnglish
Pages (from-to)614-625
Number of pages12
JournalCarbon
Volume139
DOIs
StatePublished - Nov 2018

Bibliographical note

Publisher Copyright:
© 2018 Elsevier Ltd

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science

Fingerprint

Dive into the research topics of 'High salt capacity and high removal rate capacitive deionization enabled by hierarchical porous carbons'. Together they form a unique fingerprint.

Cite this