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Journal Article

Hierarchical porous carbon from the synergistic “pore-on-pore” strategy for efficient capacitive deionization

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Zhang, Liyuan
Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Citation

Wang, H., Wei, D., Gang, H., He, Y., Deng, H., Hou, L., et al. (2019). Hierarchical porous carbon from the synergistic “pore-on-pore” strategy for efficient capacitive deionization. ACS Sustainable Chemistry & Engineering. doi:10.1021/acssuschemeng.9b06084.

Abstract

Capacitive deionization technology for brackish water treatment has been widely studied but currently still suffers from relatively low efficiency. Therefore, a rational design of promising electrode materials has become an urgent task. In this study, a so-called pore-on-pore strategy was developed by chemical activation of the intrinsic porous renewable precursor to generate a micro–meso hierarchical porous carbon. The synergistic effect of the biocomponent and activation agent is the major mechanism for the high porosity. The synthetic carbon has a very high specific surface area (2147.43 m2 g–1). In addition, the carbon exhibits good performance in terms of electroadsorption, with adsorption capacities of 19.35 and 30.64 mg g–1 in solutions with initial concentrations of 500 and 1500 mg L–1 NaCl under 1.2 V applied voltage, respectively. A capacitance retention of 98.7% and charging efficiency of 98.3% were achieved after 100 uninterrupted charge and discharge cycles, indicating relatively good regeneration performance. This research provides a bright way to develop an excellent performance electrode from renewable resources for environmental applications.