Uniform carbon hollow sphere for highly efficient electrosorption

Abstract

Carbon hollow spheres (CHS) have been initially employed as promising electrodes for highly efficient capacitive deionization (CDI). When the initial concentration of NaCl is 25 mg/L and cell voltage of 2.0 V, the electrosorption capacity of CHS is 4.8 mg/g. After five cycles of electrosorption–desorption, there is no decay on electrosorption capacity, implying excellent regeneration performance. Remarkably, the electrosorption behavior of CHS electrode can be simulated by a dynamical CDI model for batch-mode operation and the maximum electrosorption capacity of CHS predicted from Langmuir isotherm is 7.17 mg/g while the corresponding value is only 5.82 mg/g for activated carbon.