Rational Design of Titanium Carbide MXene Electrode Architectures for Hybrid Capacitive Deionization

Intercalation redox materials have shown great promise for efficient water desalination due to available faradaic gallery sites. Symmetric capacitive deionization (CDI) cells previously demonstrated using MXenes were often limited in their salt adsorption capacity (SAC) and voltage window of operati...

Full description

Saved in:
Bibliographic Details
Published in:Energy & environmental materials (Hoboken, N.J.) N.J.), 2020-09, Vol.3 (3), p.398-404
Main Authors: Buczek, Samantha, Barsoum, Michael L., Uzun, Simge, Kurra, Narendra, Andris, Ryan, Pomerantseva, Ekaterina, Mahmoud, Khaled A., Gogotsi, Yury
Format: Article
Language:English
Subjects:
bi‐stacked design
Blade coating
Cations
CDI
Deionization
Desalination
Electrodes
Magnesium
MXene
MXenes
purification
Titanium
Titanium carbide
water desalination
Citations: Items that this one cites
Items that cite this one
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Intercalation redox materials have shown great promise for efficient water desalination due to available faradaic gallery sites. Symmetric capacitive deionization (CDI) cells previously demonstrated using MXenes were often limited in their salt adsorption capacity (SAC) and voltage window of operation. In this study, current collector‐ and binder‐free Ti3C2Tx MXene electrode architectures are designed with porous carbon as the positive electrode to demonstrate hybrid CDI (HCDI) operation. Furthermore, MXene current collectors are fabricated by employing a scalable doctor blade coating technique and subsequently spray coating a layer of a small flake MXene dispersion. Hydrophilic redox‐active galleries of MXenes are capable of intercalating a variety of aqueous cations including Na+, K+, and Mg2+ ions, showing volumetric capacitances up to 250 F cm‐3. As a result, a salt removal capacity of 39 mg g‐1 with decent cycling stability is achieved. This study opens new avenues for developing freestanding, binder‐ and additive‐free MXene electrodes for HCDI applications. Efficient hybrid capacitive deionization employing faradaic MXene electrode combined with porous carbon electrode
ISSN:2575-0356
2575-0356
DOI:10.1002/eem2.12110