Using Faradaic electrodes instead of carbon electrodes to assemble hybrid capacitive deionization (HCDI) is an effective strategy to solve the shortcomings of traditional carbon-based CDI with low salt adsorption capacity (SAC). Herein, high HCDI desalination performance of Na₃Fe₂(PO₄)₃/Carbon-X (NFeP/C-X) is attested by designing and preparing three-dimensional (3D) hierarchical porous architecture via a sol-gel-calcination method. The NFeP nanoparticles with small size are uniformly embedded in interconnected carbon nanosheets, and then a convenient nanochannels and 3D conductive carbon framework is formed. This fine structure can not only improve the interface area between electrode and electrolyte, but also shorten the ion transmission distance and ensure the rapid transfer of ions and electrons, thus achieving ultra-high desalination performance. As expected, the as-prepared NFeP/C-750 shows an ultrahigh SAC of 94.5 mg g⁻¹, an ultrarapid desalination rate of 22.5 mg g⁻¹ min⁻¹ and a stable regeneration desalination ability. In addition, the desalination mechanism and ion diffusion kinetics of the NFeP/C-750 was deeply studied by ex-situ structure analysis, electrochemical characterization and density functional theories (DFT) calculations. These results demonstrate that the NFeP/C-750 with excellent desalination ability is a feasible material and offers great potential for HCDI desalination.

使用法拉第电极代替碳电极组装混合电容去离子（HCDI）是解决传统碳基CDI盐吸附能力（SAC）低缺点的有效策略。在此，Na ₃ Fe ₂ (PO ₄ ) _{3 的}高HCDI脱盐性能/Carbon-X (NFeP/CX) 通过溶胶-凝胶-煅烧方法设计和制备三维 (3D) 分层多孔结构得到证实。小尺寸的 NFeP 纳米粒子均匀嵌入相互连接的碳纳米片中，然后形成方便的纳米通道和 3D 导电碳框架。这种精细结构不仅可以提高电极与电解液的界面面积，还可以缩短离子传输距离，保证离子和电子的快速传输，从而实现超高的脱盐性能。正如预期的那样，所制备的 NFeP/C-750 显示出 94.5 mg g ^-1的超高 SAC ，22.5 mg g ^-1  min ^-1的超快速脱盐率和稳定的再生脱盐能力。此外，通过非原位结构分析、电化学表征和密度泛函理论（DFT）计算，深入研究了 NFeP/C-750 的脱盐机理和离子扩散动力学。这些结果表明，具有优异脱盐能力的 NFeP/C-750 是一种可行的材料，为 HCDI 脱盐提供了巨大的潜力。