Abstract
Capacitive deionization (CDI), as an effective and eco-friendly technology to solve the issue of freshwater scarcity, is limited to implement practical application because of the low adsorption capacity of electrode materials. Exploring a novel and high performance electrode material is still crucial for CDI research. In this work, hydrangea-like nitrogen-doped porous carbons (HNPCs) have been successfully prepared by using NH2-MIL-53(Al) as precursor. Benefiting from large surface area (1369 m2·g−1) and high nitrogen content, the porous carbon carbonized at 900 °C (HNPC-900) exhibits an excellent electrochemical performance and a high adsorption ability of 21.17 mg·g−1 in 500 mg·L−1 NaCl solution at the applied voltage of 1.2 V. Meanwhile, 15 adsorption–desorption cycles suggest HNPC-900 electrode possesses renewability. This work demonstrates that HNPC-900 could be a promising electrode material for CDI and provides a strong support for the application of carbon materials derived from NH2-MIL-53(Al) in CDI field.
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