Capacitive deionization with MoS2/g-C3N4 electrodes.

The issue of insufficient freshwater resources has become a worldwide problem, restricting social and economic development. As a promising technology, capacitive deionization (CDI) has been developed to address this problem. In this work, MoS 2 /g-C 3 N 4 composite with a high supercapacitor performance was successfully synthesized and assembled as the CDI electrode material with its electrochemical properties deeply evaluated. The results demonstrated that the MoS 2 /g-C 3 N 4 -based electrode demonstrated a large specific capacitance of 118.3 F/g (at 1 A/g) and a remarkable rate capacitance retention of 52.16% (61.7 F/g) (at 10 A/g). Moreover, the MoS 2 /g-C 3 N 4 -based electrode exhibited obvious improvement in desalination performance with the maximum electrosorption capacity of 24.5 mg/g. The hierarchical architecture, enhanced conductivity, large surface area, and negative zeta potential of MoS 2 /g-C 3 N 4 composite facilitated the fast diffusion of ions. The enhanced ions adsorption performance of the MoS 2 /g-C 3 N 4 -based electrode was evaluated based on a capacitive contribution of 85.26% and a diffusion-controlled contribution of 14.74%. Unlabelled Image • MoS 2 /g-C 3 N 4 composite with a high supercapacitor performance is synthesized. • MoS 2 /g-C 3 N 4 electrode exhibits an electrosorption capacity of 24.2 mg/g. • Capacitive and diffusion-controlled processes contribute to the salt storage. • Capacitive-controlled process dominates the contribution (85.26%). • A good regeneration performance is demonstrated. [ABSTRACT FROM AUTHOR]