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Huazeng Yang, Rui Zhang, Ming Hou, Dongling Li, Jun Cao, Xingtao Xu, Weiwei Zhou, Guangwu Wen, Xiaoxiao Huang, Dong Wang. Organic anion-intercalation boosting intrinsic Cl- capture capability of layered double hydroxide anode for enhanced capacitive deionization. Green Energy&Environment. doi: 10.1016/j.gee.2025.12.001
Citation: Huazeng Yang, Rui Zhang, Ming Hou, Dongling Li, Jun Cao, Xingtao Xu, Weiwei Zhou, Guangwu Wen, Xiaoxiao Huang, Dong Wang. Organic anion-intercalation boosting intrinsic Cl- capture capability of layered double hydroxide anode for enhanced capacitive deionization. Green Energy&Environment. doi: 10.1016/j.gee.2025.12.001
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Organic anion-intercalation boosting intrinsic Cl- capture capability of layered double hydroxide anode for enhanced capacitive deionization

doi: 10.1016/j.gee.2025.12.001

  • 1. School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, P. R. China;

  • 2. Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, P. R. China;

  • 3. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, P. R. China;

  • 4. Shandong Silicon Nano New Material Technology Co. LTD, Zibo 255000, P. R. China;

  • 5. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150000, P. R. China

Funds:

We gratefully acknowledge financial supports from the National Natural Science Foundation of China (No. 52202371), the Natural Science Foundation of Shandong Province (No. ZR2024ME168, ZR2023ME010), Youth Innovation Team Program in Colleges of Shandong Province (No. 2023KJ151), Science and Technology-based Small and Medium Enterprises (ST-SMEs) Innovation Capacity Enhancement Program of Shandong Province (No. 2023TSGC0484), SDUT&

Zibo City Integration Development Project (No. 2021SNPT0045).

  • Received date 07 September 2025, Accepted date 10 December 2025, RevRecd date 10 November 2025, Available online 23 December 2025
    Abstract
  • Layered double hydroxides (LDH) hold great promise as capacitive deionization (CDI) anode owing to high Cl- capture capacity and abundant interlamellar ions transport channels. However, their narrow interlayer spacing results in sluggish ions diffusion and huge volume variation during Cl- adsorption/desorption, which become worse owing to large ionic radius of Cl-. Herein, we reveal the significant effectiveness of organic anions intercalation on boosting intrinsic Cl- capture capabilities of LDH anode. Compared with traditional inorganic anions-intercalated LDH anode, organic anion-intercalated LDH possess expanded interlayer spacing and increased proportion of highly active divalent metal ions in the host layer. Theoretical calculations unveil that organic anion intercalation endow LDH with stronger Cl- capture ability, faster ions diffusion behaviors, and stronger bonding strength with positively charged host layers. As expected, the prepared seven kinds of organic anion-intercalated LDH anodes all manifest fast pseudocapacitive reaction kinetics and enhanced desalination performance; particularly, sodium dodecyl sulfate (SDS) intercalated LDH (LDH-SDS) anode exhibits large desalination capacity of 58.6 mg g-1 and excellent cyclic stability (76.9% retention ratio over 300 cycles), surpassing most of previously reported LDH-based CDI anodes. A series of in-situ/ex-situ characterizations further reveal outstanding structural stability and electrochemical reversibility of LDH-SDS anode. This work demonstrates great potential of crystal modulation on improving intrinsic ions capture capability of LDH and pave new insights for developing advanced CDI electrode.

     

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