Desalination performance of capacitive deionization (CDI), a promising deionization technology, depends significantly upon the compositions and internal structures of electrode materials. Herein, hollow ZIFs-derived nanoporous carbons (HZCs) were prepared via chemical etching method and subsequent pyrolysis. Particularly, the tannic acid as an etching agent was employed to tailor hollow structure. The resultant HZCs possess high surface area, wide pore size distribution, obvious hollow cavity and high nitrogen content. Moreover, HZCs electrodes exhibited a significantly improved CDI performance over the solid ZIF-derived nanoporous carbons (SZCs) electrodes. The improved electrosorption rate and capacity (15.31 mg g^-1 at 1.2 V) of HZCs electrode imply that hollow structure facilitates the transportation for both ions and mass on CDI process. Besides, the further cycle experiment exhibits a great regeneration stability of HZCs electrode over 20 adsorption-desorption cycles. All these results indicate that HZCs should be a promising candidate for CDI application.

电容性去离子（CDI）的脱盐性能，一种有前途的去离子技术，在很大程度上取决于电极材料的组成和内部结构。在此，通过化学蚀刻方法并随后进行热解来制备源自中空ZIF的纳米孔碳（HZC）。特别地，使用单宁酸作为蚀刻剂来调整中空结构。生成的HZCs具有较高的表面积，宽的孔径分布，明显的中空空腔和较高的氮含量。此外，HZCs电极比固态ZIF衍生的纳米孔碳（SZCs）电极表现出显着改善的CDI性能。改善的电吸附速率和容量（15.31 mg g ^-1 HZCs电极在1.2 V电压下）暗示中空结构有利于CDI工艺中离子和质量的传输。此外，进一步的循环实验表明，在20个吸附-解吸循环中，HZCs电极具有很大的再生稳定性。所有这些结果表明，HZC应该是CDI应用的有前途的候选者。