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<p>Graphene electrodes have emerged as a preferred material for capacitive deionization (CDI) systems, an energy-efficient approach to water desalination, owing to their exceptional electrical conductivity and high surface area. Here we introduce a simple one-step laser ablation technique to fabricate nickel-incorporated laser-induced graphene (Ni-LIG) electrodes by irradiating polyimide films infused with a Ni(acac)₂ precursor. Material characterization confirmed the in-situ formation of both nickel oxide and nickel carbide phases during laser processing, indicating partial nickel oxidation. The presence of nickel species induced structural modifications in the graphene matrix, resulting in more continuous few-layer graphene with fewer defects and a homogeneously porous architecture characterized by smaller pore sizes. When tested in a capacitive deionization (CDI) system, the 3% Ni-LIG electrode exhibited exceptional performance, achieving a salt adsorption capacity (SAC) of 3.3&#xa0;mg/g—a sixfold increase over pristine LIG (0.5&#xa0;mg/g). Our method offers a scalable and controllable route to engineer high-efficiency CDI electrodes via direct laser integration of metal nanoparticles into graphene.</p>

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Nickel composite nanoparticle embedded Laser-Induced graphene for enhanced capacitive Deionization performance

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Xiangyu Lu,
  • Dong Wang,
  • Sheng Ding,
  • Dun Wu

摘要

Graphene electrodes have emerged as a preferred material for capacitive deionization (CDI) systems, an energy-efficient approach to water desalination, owing to their exceptional electrical conductivity and high surface area. Here we introduce a simple one-step laser ablation technique to fabricate nickel-incorporated laser-induced graphene (Ni-LIG) electrodes by irradiating polyimide films infused with a Ni(acac)₂ precursor. Material characterization confirmed the in-situ formation of both nickel oxide and nickel carbide phases during laser processing, indicating partial nickel oxidation. The presence of nickel species induced structural modifications in the graphene matrix, resulting in more continuous few-layer graphene with fewer defects and a homogeneously porous architecture characterized by smaller pore sizes. When tested in a capacitive deionization (CDI) system, the 3% Ni-LIG electrode exhibited exceptional performance, achieving a salt adsorption capacity (SAC) of 3.3 mg/g—a sixfold increase over pristine LIG (0.5 mg/g). Our method offers a scalable and controllable route to engineer high-efficiency CDI electrodes via direct laser integration of metal nanoparticles into graphene.