New families of materials that may potentially replace dominant
carbon electrodes have emerged as a major research hotspot in the
field of capacitive deionization (CDI). Here, we report a metal–
organic framework (MOF)/polypyrrole (PPy) hybrid, in which conductive
PPy nanotubes that are running through each MOF particle have
the potential to increase the overall bulk electrical conductivity,
thus promoting such a system as a good CDI electrode material.
Consequently, the MOF/PPy hybrid shows a high desalination
capacity of 11.34 mg g1, which is amongst those of state-of-theart
CDI electrodes. Moreover, the MOF/PPy hybrid also shows a
superior desalination performance for brackish water and good
cycling stability, far exceeding typical carbon-based benchmarks.
This is the first example of CDI electrodes derived from direct MOFbased
materials, highlighting the potential of these hybrid systems
as promising materials beyond traditional carbon electrodes.