Core–shell 2D nanoarchitectures: engineering N, P-doped graphitic carbon/MXene heterostructures for superior capacitive deionization

Abstract

Engineering MXene-based 2D heterostructures is a hot research topic for capacitive deionization (CDI) materials. Herein, MXene nanosheets were ingeniously integrated with metal-organic frameworks (MOFs)-derived carbons to generate the N, P-doped...

Nanoarchitectonics of ultrafine molybdenum carbide nanocrystals into three-dimensional nitrogen-doped carbon framework for capacitive deionization

“…, redox contribution) were calculated according to eqn (2) and (3) (S1.6†). 40,44,45 As illustrated in Fig. 3g, the fitted curves between the logarithm of current densities (log I ) and the logarithm of scan rates (log v ) are straight lines for both the discharging and charging steps.…”

“…2e illustrate that two distinct peaks at approximately 1341 and 1580 cm −1 are observed for the three NC/Mo y C- x and ZIF-8-C, corresponding to the D-band associated with lattice defects, and the G-band related to the stretching vibrations of graphitic carbons, respectively. 40 The I D / I G ratio of NC/MoC- x , as the evaluation for the degrees of carbon disorders/defects, are calculated to be 1.49 (NC/MoC-0.25), 1.43 (NC/MoC-0.5), and 1.37 (NC/MoC/Mo 2 C-1), lower than that of ZIF-8-C (2.13). The I D / I G ratio achieves a decreasing trend along with the increase in Mo y C proportions in NC/Mo y C- x , suggesting a decrease in lattice defects with the improved graphitization degree from NC/MoC-0.25 to NC/MoC/Mo 2 C-1, which might be beneficial for accelerating charge transfer and stabilizing the carbide nanocrystals.…”

Capacitive deionization system with ultra-high salt adsorption performance: from lab design to agricultural applications

“…The electrode achieved an ultra-high SAC of approximately 200 mg g −1 at 100 mA g −1 under a constant current charge process using a 600 mM NaCl solution. Similarly, Zhang et al 49 successfully synthesized a N,P-doped carbon/MXene electrode with a core–shell nanostructure through the calcination process of the MXene/ZIF-67 precursor. Compared to pure MXene, C/MXene exhibited over 60 F g −1 capacitance at current density 0.5 A g −1 .…”

Enhanced Capacitive Deionization Performance of Ti3C2Tx/C via Structural Modification Assisted by PMMA-Derived Carbon Spheres

“…The excellent deionization efficiency of CDI technology is highly contingent on the choice of electrode materials. In the past few years, MXene − has gained popularity as a sought-after electrode material owing to its high conductivity, excellent hydrophilicity, and abundant ion adsorption sites with Ti 3 C 2 T x being the most studied. − However, Ti 3 C 2 T x suffers from a serious lamellar stacking problem, which results in unsatisfactory ion removal capacity. Constructing three-dimensional Ti 3 C 2 T x (3D Ti 3 C 2 T x ) is an efficient approach to deal with this problem, and the freeze-drying method is quite straightforward to operate. − Despite this, the structure of the resultant 3D Ti 3 C 2 T x frequently exhibits instability and is susceptible to collapse.…”