Cu@Cu 2 O/carbon for efficient desalination in capacitive deionization

Electrode materials with strong desalting ability is an important research direction of capacitive deionization. In this study, HKUST-1 was successfully synthesized by the solvothermal method, and MOFsderived porous carbon/Cu@Cu 2 O composites were prepared by simple pyrolysis as cathode materials for CDI. After high-temperature pyrolysis, the Cu + site with unsaturated coordination is generated, and the structure changes from micropores to the coexistence of mesoporous and micropores. The complex pore structure is conducive to strengthening ion migration and diffusion. The results show that the porous carbon/Cu@Cu 2 O materials derived from MOFs depend on the pseudocapacitance behavior for capacitive deionization and desalination. At a voltage window of -1.2 V similar to 1.2 V, a current density of 40 mA/g, and 5 mmol/L NaCl, the HDC-110 0 exhibited the best desalting capacity of 30.9 mg/g. HDC-110 0 also has good cycle stability. After 20 cycles of adsorption and desorption, the desalting capacity almost does not decrease. Therefore, MOFs derived porous carbon/Cu@Cu 2 O composites are expected to be an excellent choice for CDI cathode materials. (c) 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.