Ultrathin nitrogen-doped carbon TiCT-TiN heterostructure derived from ZIF-8 nanoparticles sandwiched MXene for high-performance capacitive deionization.

J Colloid Interface Sci

Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. Electronic address:

Published: May 2024

AI Article Synopsis

  • The research focuses on creating high-performance electrode materials for capacitive deionization (CDI) to improve desalination efficiency.
  • A novel ultrathin heterostructure combining nitrogen-doped carbon and TiN was developed using ZIF-8 nanoparticles and MXene nanosheets, resulting in enhanced electrode properties.
  • The engineered NC/MX-TiN demonstrated excellent adsorption capacity and cycling stability in saline water, paving the way for future advancements in CDI technologies.

Article Abstract

Rational design of high-performance electrode materials is crucial for enhancing desalination performance of capacitive deionization (CDI). Here, ultrathin nitrogen-doped carbon/TiCT-TiN (NC/MX-TiN) heterostructure was developed by pyrolyzing zeolite imidazolate framework-8 (ZIF-8) nanoparticles sandwiched MXene (ZSM), which were formed by assembling ultrafine ZIF-8 nanoparticles with size of 20 nm on both sides of MXene nanosheets. The introduction of ultrasmall ZIF-8 particles allowed for in situ nitridation of the MXene during pyrolysis, forming consecutive TiN layers tightly connected to the internal MXene. The two-dimensional (2D) heterostructure exhibited remarkable properties, including high specific surface area and excellent conductivity. Additionally, the resulting TiN demonstrated exceptional redox capability, which significantly enhanced the performance of CDI and ensured cycling stability. Benefiting from these advantages, the NC/MX-TiN exhibited a maximum adsorption capacity of 45.6 mg g and a steady cycling performance in oxygenated saline water over 50 cycles. This work explores the rational design and construction of MXene-based 2D heterostructure and broadens new horizons for the development of novel CDI electrode materials.

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http://dx.doi.org/10.1016/j.jcis.2024.01.144DOI Listing

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