Jiang Yuxin, Hou Zhiguo, Yan Lvji, Gang Haiyin, Wang Haiying, Chai Liyuan
School of Metallurgy and Environment, Central South University, Changsha 410083, China.
School of Chemistry and Materials, University of Science and Technology of China, Hefei 230026, China.
Polymers (Basel). 2022 Nov 7;14(21):4776. doi: 10.3390/polym14214776.
Capacitive deionization is an emerging desalination technology with mild operation conditions and high energy efficiency. However, its application is limited due to the low deionization capacity of traditional capacitive electrodes. Herein, we report a novel dual-ion capacitive deionization system with a lithium-ion battery cathode LiMnO/C and a sodium-ion battery anode NaTi(PO)/C. Lithium ions could enhance the charge transfer during CDI desalination, while NaTi(PO)/C provided direct intercalation sites for sodium ions. The electrochemical capacities of the battery electrodes fitted well, which was favorable for the optimization of the desalination capacity. The low potential of the redox couple Ti/Ti (-0.8 V versus Ag/AgCl) and intercalation/deintercalation behaviors of sodium ions that suppressed hydrogen evolution could enlarge the voltage window of the CDI process to 1.8 V. The novel CDI cell achieved an ultrahigh desalination capacity of 140.03 mg·g at 1.8 V with an initial salinity of 20 mM, revealing a new direction for the CDI performance enhancement.
电容去离子化是一种新兴的脱盐技术，具有温和的操作条件和较高的能源效率。然而，由于传统电容电极的去离子化能力较低，其应用受到限制。在此，我们报道了一种新型的双离子电容去离子化系统，该系统具有锂离子电池阴极LiMnO/C和钠离子电池阳极NaTi(PO)/C。锂离子可增强电容去离子化脱盐过程中的电荷转移，而NaTi(PO)/C为钠离子提供了直接的嵌入位点。电池电极的电化学容量匹配良好，这有利于优化脱盐容量。氧化还原对Ti/Ti的低电位（相对于Ag/AgCl为-0.8 V）以及抑制析氢的钠离子嵌入/脱嵌行为可将电容去离子化过程的电压窗口扩大至1.8 V。这种新型的电容去离子化电池在1.8 V、初始盐度为20 mM的条件下实现了140.03 mg·g的超高脱盐容量，为提高电容去离子化性能揭示了一个新方向。
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