High-yield green synthesis of N-doped hierarchical porous carbon by Nitrate-Mediated organic salt activation strategy for capacitive Deionization: Universality and commerciality

Shi, Mingxing; Lu, Keren; Hong, Xianyong; Qiang, Hua; Li, Chun; Ding, Zhoutian; Wang, Tianyi; Xia, Mingzhu

doi:10.1016/j.cej.2023.144465

Cited by 36 publications

(1 citation statement)

References 49 publications

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“…This is because the Coulomb interaction between the ion and the electrode is enhanced at a higher voltage, which increases the ion transfer rate. In addition, the increased voltage hastens the leaching of ions and increases electrostatic force. , The concentration of the solution ions rises noticeably at the beginning of the applied voltage, suggesting that metal ions quickly transfer their charge from the positive electrode to the recovery solution as a result of a fast water flow. Leaching equilibrium can be obtained in 60 min at the latest at 4.2 or 4.8 V voltage during CDI operation when the conductivity in the solution no longer varies, the charge equilibrium is reached, and the ions in the cathode no longer change.…”

Section: Explore Leaching Conditionsmentioning

confidence: 99%

Strategy for Efficient Recovery of NCM Materials by the Reagent-Free Method: Green Recovery of Lithium and High-Value Byproducts through Capacitive Deionization Reverse Applications

Men,

Lin,

Zhu

et al. 2024

ACS Sustainable Chem. Eng.

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The traditional lithium-ion battery (LIB) recycling method is inseparable from the application of chemical reagents such as acid and alkali, so efficient and green valuable metal recovery technology is invaluable. Moreover, the current development of environmentally friendly capacitive deionization (CDI) has been limited by the field of desalination. This work proposes a reagentfree method for the efficient recovery of spent LIB cathode materials, which realizes the green recovery of lithium by leaching lithium ions into the ultrapure water through CDI reverse application. Lithium ions in the leaching solution can be recovered by evaporation crystallization in the form of LiOH•H 2 O. Studies have shown that the CDI leaching process has a unidirectional selectivity for Li + . The leaching capacity of lithium in LiNi x Co y Mn 1−x−y O 2 (NCM) materials can reach 42.95 mg/g, but the leaching capacity of other metal elements (Ni, Co, and Mn) was 0 mg/g. The lithium content in the recycled cathode material after the CDI experiment was reduced by 90%, which can be used as a precursor for the preparation of fresh NCM materials. Meanwhile, under the action of current and voltage, the arrangement of bulk graphite crystals in the anode electrode after the experiment changes from disordered to orderly layered, which can be reused in the CDI system or as a high-value prelithium graphite for the production of fresh batteries. This work expands the new application field of CDI and realizes the green recycling of spent LIB cathode materials without using any acid or alkali reagents, which is conducive to the sustainable development of the environment.

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Section: Explore Leaching Conditionsmentioning

confidence: 99%

Strategy for Efficient Recovery of NCM Materials by the Reagent-Free Method: Green Recovery of Lithium and High-Value Byproducts through Capacitive Deionization Reverse Applications

Men,

Lin,

Zhu

et al. 2024

ACS Sustainable Chem. Eng.

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Hydrogen‐Bonded Organic Framework Derived 2D N, O Co‐Doped Carbon Nanobelt with Tunable Pseudocapacitive Contribution for Efficient Capacitive Deionization

Meng,

Liu,

Ding

et al. 2023

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Defect engineering is recognized as an attractive method for modulating the electronic structure and physicochemical characteristics of carbon materials. Exploiting heteroatom‐doped porous carbon with copious active sites has attracted great attention for capacitive deionization (CDI). However, traditional methods often rely on the utilization of additional heteroatom sources and strong corrosive activators, suffering from low doping efficiency, insufficient doping level, and potential biotoxicity. Herein, hydrogen‐bonded organic frameworks (HOFs) are employed as precursors to synthesize N, O co‐doped porous carbon via a simple and green reverse defect engineering strategy, achieving controllable heavy doping of heteroatoms. The N, O co‐doping triggers significant pseudocapacitive contribution and the surface pore structure supports the formation of the electric double layer. Therefore, when HOF‐derived N, O co‐doped carbon is used as CDI electrodes, a superior salt adsorption capacity of 32.29 ± 1.42 mg g−1 and an outstanding maximum salt adsorption rate of 10.58 ± 0.46 mg g−1 min−1 at 1.6 V in 500 mg L−1 NaCl solution are achieved, which are comparable to those of state‐of‐the‐art carbonaceous electrodes. This work exemplifies the effectiveness of the reverse nitrogen‐heavy doping strategy on improving the carbon structure, shedding light on the further development of rational designed electrode materials for CDI.

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Biomimetic Mineralization Synthesis of Flower‐Like Cobalt Selenide/Reduced Graphene Oxide for Improved Electrochemical Deionization

Fu,

Yu,

et al. 2024

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Rationally and precisely tuning the composition and structure of materials is a viable strategy to improve electrochemical deionization (EDI) performances, which yet faces enormous challenges. Herein, an eco‐friendly biomimetic mineralization synthetic strategy is developed to synthesize the flower‐like cobalt selenide/reduced graphene oxide (Bio‐CoSe2/rGO) composites and used as advanced sodium ion adsorption electrodes. Benefiting from the slow and controllable reaction kinetics provided by the biomimetic mineralization process, the flower‐like CoSe2 is uniformly constructed in the rGO, which is endowed with robust architecture, substantial adsorption sites and rapid charge/ion transport. The Bio‐CoSe2/rGO electrode yields the maximum salt adsorption capacity and salt adsorption rate of 56.3 mg g−1 and 5.6 mg g−1 min−1 respectively, and 92.5% capacity retention after 60 cycles. These results overmatch the pristine CoSe2 and irregular granular CoSe2/rGO synthesized by a hydrothermal method, proving the structural superiority of the Bio‐CoSe2/rGO composites. Furthermore, the in‐depth adsorption kinetics study indicates the chemisorption nature of sodium ion adsorption. The structures of the Bio‐CoSe2/rGO composites after long term EDI cycles are intensively studied to unveil the mechanism behind such superior EDI performances. This study offers one effective method for constructing advanced EDI electrodes, and enriches the application of the biomimetic mineralization synthetic strategy.

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High-yield green synthesis of N-doped hierarchical porous carbon by Nitrate-Mediated organic salt activation strategy for capacitive Deionization: Universality and commerciality

Cited by 36 publications

References 49 publications

Strategy for Efficient Recovery of NCM Materials by the Reagent-Free Method: Green Recovery of Lithium and High-Value Byproducts through Capacitive Deionization Reverse Applications

Strategy for Efficient Recovery of NCM Materials by the Reagent-Free Method: Green Recovery of Lithium and High-Value Byproducts through Capacitive Deionization Reverse Applications

Hydrogen‐Bonded Organic Framework Derived 2D N, O Co‐Doped Carbon Nanobelt with Tunable Pseudocapacitive Contribution for Efficient Capacitive Deionization

Biomimetic Mineralization Synthesis of Flower‐Like Cobalt Selenide/Reduced Graphene Oxide for Improved Electrochemical Deionization

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