Capacitive deionization system with ultra-high salt adsorption performance: from lab design to agricultural applications

He, Rui; Yu, Yongchang; Kong, Lingchen; Liu, Xitong; Dong, Pei

doi:10.1039/d3cc03206j

Chem. Commun.

2023

DOI: 10.1039/d3cc03206j

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Capacitive deionization system with ultra-high salt adsorption performance: from lab design to agricultural applications

Rui He,

Yongchang Yu,

Lingchen Kong

et al.

Abstract: Capacitive deionization is an emerging water desalination technology for industrial applications. Recent advancements in electrode design and system development have led to the reporting of ultra-high salt adsorption performance, benefiting...

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Cited by 13 publications

References 90 publications

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High‐Efficiency Electrochemical Desalination: The Role of a Rigid Pseudocapacitive Polymer Electrode with Diverse Active Sites

Tao,

Cui,

Wang

et al. 2024

Adv Funct Materials

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Hybrid capacitive deionization (HCDI) emerges as a burgeoning electrochemical desalination technology due to the utilization of profitable pseudocapacitive reactions. Although tunable organic compounds are potential faradaic electrode materials, their insufficient active sites and high water‐solubility restrict practical HCDI applications. Herein, a pseudocapacitive organic polymer (PNDS) is proposed with diverse redox‐active sites for electrochemical deionization. The pronounced molecular aromaticity and strong π‐electron delocalization not only endow PNDS polymer with framework rigidity, but refine its electronic structure to bolster redox activity and electron affinity. As an electrode material, the PNDS polymer demonstrates a substantial pseudocapacitive capacitance of 390 F g−1 and sustains long‐term stability at 96.3% after 5000 cycles, surpassing reported Na+‐capturing organic electrodes. In‐operando monitoring techniques and theoretical calculations reveal efficient Na+ capture at the C═N and C═O redox‐active sites within the PNDS electrode during repeated electrosorption processes. As a conceptual demonstration, a high‐performance HCDI device equipped with the PNDS electrode exhibits an impressive salt removal capacity (66.4 mg g−1), a rapid removal rate (2.2 mg g−1 min−1) and stable regeneration property. More importantly, an integrated desalination system is engineered to rapidly and repeatedly treat saltwater resources for human consumption and agricultural irrigation, highlighting its promising prospects for high‐efficiency desalination applications.

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High‐Efficiency Electrochemical Desalination: The Role of a Rigid Pseudocapacitive Polymer Electrode with Diverse Active Sites

Tao,

Cui,

Wang

et al. 2024

Adv Funct Materials

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Coordination Confined Silver‐Organic Framework for High Performance Electrochemical Deionization

Wei,

Ouyang,

Cao

et al. 2024

Advanced Science

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Silver (Ag) is deemed a promising anode material for capacitive deionization (CDI) due to its high theoretical capacity and efficient selectivity to Cl−. However, the strong volume change during the conversion reaction significantly undermines the cycling performance of the Ag electrode. Additionally, achieving well‐dispersed Ag in the active matrix is challenging, as Ag electrodes prepared by conventional thermal reduction tend to agglomerate. Herein, the organic linker confinement strategy is proposed, applying metal–organic framework (MOF) chemistry between Ag nodes and organic ligands to construct Ag‐based MOF. The uniform dispersion of Ag at the molecular level, confined in the organic matrix, efficiently enhances the utilization of active sites, and strengthens the interfacial stability of Ag. Consequently, the Ag‐MOF for the CDI anode exhibits an excellent Cl− removal capacity of 121.52 mg g−1 at 20 mA g−1 in 500 mg L−1 NaCl solution, and a high Ag utilization rate of 60.54%. After 100 cycles, a capacity retention of 96.93% is achieved. Furthermore, the Cl− capture mechanism of Ag‐MOF is elucidated through density functional theory (DFT) calculations, ex situ XRD, ex situ Raman and XPS. This ingenious electrode design can offer valuable insights for the development of high‐performance conversion electrodes for CDI applications.

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Carbon nanoarchitecture encapsulated highly dispersed ultrafine Ag particles composite anode for high-capacity desalination

Wei,

Ouyang,

Cao

et al. 2024

Chemical Engineering Journal

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Capacitive deionization system with ultra-high salt adsorption performance: from lab design to agricultural applications

Abstract: Capacitive deionization is an emerging water desalination technology for industrial applications. Recent advancements in electrode design and system development have led to the reporting of ultra-high salt adsorption performance, benefiting...

Cited by 13 publications

References 90 publications

High‐Efficiency Electrochemical Desalination: The Role of a Rigid Pseudocapacitive Polymer Electrode with Diverse Active Sites

High‐Efficiency Electrochemical Desalination: The Role of a Rigid Pseudocapacitive Polymer Electrode with Diverse Active Sites

Coordination Confined Silver‐Organic Framework for High Performance Electrochemical Deionization

Carbon nanoarchitecture encapsulated highly dispersed ultrafine Ag particles composite anode for high-capacity desalination

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