In this work, we synthesized metal-organic framework Cu₃(BTC)₂ which was applied as the doping materials of anode electrodes in capacitive deionization (CDI) for the first time. Cu₃(BTC)₂ possessed a hierarchical channel structure and a specific surface area as high as 2160 m² g⁻¹. Fifty weight percent of Cu₃(BTC)₂-doped activated carbon electrode (AC-M5) demonstrated better hydrophilicity, greater capacitance performance, and smaller material internal resistance than AC electrode. Capacitive deionization experimental result showed AC-M5 had the biggest electrosorption capacity of 35 mg g⁻¹, which was 2.2 times higher than that of control. In addition to the excellent surface structure and electrochemical performance, the electrostatic force derived from Cu²⁺ greatly enhanced the adsorption performance of electrodes. The effect of desalination at the anode was much greater than that at the cathode, which also verified the effect of electrostatic forces on adsorption. Simple doping greatly improved the electrosorption capacity, indicating that Cu₃(BTC)₂ should be a promising doping material in anode for highly capacitive deionization applications.

在这项工作中，我们合成了金属有机骨架Cu ₃（BTC）₂，该金属首次在电容性去离子（CDI）中用作阳极电极的掺杂材料。Cu ₃（BTC）₂具有层状的通道结构，比表面积高达2160m ²  g ^-1。与AC电极相比，掺有Cu ₃（BTC）_2的活性炭电极（AC-M5）的重量百分比为50％，表现出更好的亲水性，更大的电容性能和更小的材料内阻。电容去离子实验结果表明，AC-M5的最大电吸附容量为35 mg g ^-1，比对照高2.2倍。除了出色的表面结构和电化学性能，Cu ²⁺产生的静电力还大大增强了电极的吸附性能。阳极上的脱盐效果远大于阴极上的脱盐效果，这也证实了静电力对吸附的影响。简单的掺杂极大地改善了电吸附能力，表明Cu ₃（BTC）₂应该是阳极中用于高电容去离子应用的有前途的掺杂材料。