Capacitive deionization (CDI) as a novel energy and cost-efficient water treatment technology has attracted increasing attention. The recent development of various faradaic electrode materials has greatly enhanced the performance of CDI as compared with traditional carbon electrodes. Prussian blue (PB) has emerged as a promising CDI electrode material due to its open framework for the rapid intercalation/de-intercalation of sodium ions. However, the desalination efficiency, and durability of previously reported PB-based materials are still unsatisfactory. Herein, a self-template strategy is employed to prepare a Poly(3,4-ethylenedioxythiophene) (PEDOT) reinforced cobalt hexacyanoferrate nanoflakes anchored on carbon cloth (denoted as CoHCF@PEDOT). With the high conductivity and structural stability achieved by coupling with a thin PEDOT layer, the as-prepared CoHCF@PEDOT electrode exhibits a high capacity of 126.7 mAh g⁻¹ at 125 mA g⁻¹. The fabricated hybrid CDI cell delivers a high desalination capacity of 146.2 mg g⁻¹ at 100 mA g⁻¹, and good cycling stability. This strategy provides an efficient method for the design of high-performance faradaic electrode materials in CDI applications.

中文翻译：

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通过 PEDOT 增强六氰基铁酸钴纳米片阵列中的界面耦合实现增强的电容去离子

电容去离子（CDI）作为一种新型的节能且经济高效的水处理技术越来越受到人们的关注。近年来各种法拉第电极材料的发展，与传统碳电极相比，大大提高了CDI的性能。普鲁士蓝 (PB) 由于其开放的框架可快速嵌入/脱嵌钠离子，已成为一种有前途的 CDI 电极材料。然而，之前报道的PB基材料的海水淡化效率和耐久性仍然不能令人满意。在此，采用自模板策略制备锚定在碳布上的聚（3,4-乙撑二氧噻吩）（PEDOT）增强六氰基铁酸钴纳米片（表示为CoHCF@PEDOT）。通过与薄PEDOT层耦合实现高电导率和结构稳定性，所制备的CoHCF@PEDOT电极在125 mA g ^{-1下表现出126.7 mAh g -1}的高容量。所制造的混合CDI电池在100 mA g ^{-1下具有146.2 mg g -1}的高脱盐能力和良好的循环稳定性。该策略为 CDI 应用中高性能法拉第电极材料的设计提供了一种有效的方法。