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<p>To address the dual challenges of freshwater scarcity and energy storage demands, battery deionization has emerged as a promising technology for simultaneous salt removal and energy recovery. Compared to the significant research advancement in cation-storage electrodes, anion-storage counterparts remain a critical bottleneck thus limiting the industrialization of battery deionization technique. Here, we employ Cu<sub>2</sub>O as a Cl<sup>−</sup> storage electrode material, by engineering the electrochemical-driven reversible synthesis-decomposition process between Cu<sub>2</sub>O and Cu<sub>2</sub>(OH)<sub>3</sub>Cl, the Cu<sub>2</sub>O electrode delivers the state-of-the-art high charge capacity of 286.3 ± 8.1 mAh g<sup>−1</sup> and Cl<sup>−</sup> storage capacity of 203.5 ± 21.3 mg g<sup>−1</sup> in natural seawater. Ex-situ liquid cell electrochemical transmission electron microscopy and in-situ powder X-ray diffraction unveil a continuous and spatial confirmed electrochemical-driven electrode oxidation, spatial migration and crystallization mechanism engaged in the reversible structural transformation between Cu<sub>2</sub>O and Cu<sub>2</sub>(OH)<sub>3</sub>Cl during battery deionization process. This work not only introduces a highly efficient electrode material for Cl<sup>−</sup> removal but also establishes a basis for leveraging the electrochemical-driven reversible synthesis-decomposition process and spatial confinement reversible structural transformation mechanism to design advanced electrode materials for diverse ion removal applications.</p>

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Engineering the reversible redox electrochemistry on cuprous oxide for efficient chloride ion uptake

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月7日

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  • Songhe Yang,
  • Xiaosong Gu,
  • Xuezhen Feng,
  • Ranhao Wang,
  • Xiang-Yang Lou,
  • Wenfei Wei,
  • Hong Chen

摘要

To address the dual challenges of freshwater scarcity and energy storage demands, battery deionization has emerged as a promising technology for simultaneous salt removal and energy recovery. Compared to the significant research advancement in cation-storage electrodes, anion-storage counterparts remain a critical bottleneck thus limiting the industrialization of battery deionization technique. Here, we employ Cu2O as a Cl− storage electrode material, by engineering the electrochemical-driven reversible synthesis-decomposition process between Cu2O and Cu2(OH)3Cl, the Cu2O electrode delivers the state-of-the-art high charge capacity of 286.3 ± 8.1 mAh g−1 and Cl− storage capacity of 203.5 ± 21.3 mg g−1 in natural seawater. Ex-situ liquid cell electrochemical transmission electron microscopy and in-situ powder X-ray diffraction unveil a continuous and spatial confirmed electrochemical-driven electrode oxidation, spatial migration and crystallization mechanism engaged in the reversible structural transformation between Cu2O and Cu2(OH)3Cl during battery deionization process. This work not only introduces a highly efficient electrode material for Cl− removal but also establishes a basis for leveraging the electrochemical-driven reversible synthesis-decomposition process and spatial confinement reversible structural transformation mechanism to design advanced electrode materials for diverse ion removal applications.