Hierarchical composite of N-doped carbon sphere and holey graphene hydrogel for high-performance capacitive deionization

Mi, Mengjuan; Liu, Xiaojun; Kong, Weiqing; Ge, Yifei; Dang, Weiqi; Hu, Jiawen

doi:10.1016/j.desal.2019.04.014

Cited by 82 publications

(24 citation statements)

References 42 publications

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“…Noticeably, the charge efficiency is less than the theoretical value 1. This is caused by (a) the insulating binder increases the internal resistance of the electrode; (b) the contact electrode/collector resistance also consumes a certain part of the charge . Meanwhile, to further understand the impact of salt concentration on CDI performance, the Langmuir isotherm model was employed to fit experimental data …”

Section: Resultsmentioning

confidence: 99%

Hierarchical Porous Carbon from the Synergistic “Pore-on-Pore” Strategy for Efficient Capacitive Deionization

Wang

Wei

Gang

et al. 2019

ACS Sustainable Chem. Eng.

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Capacitive deionization technology for brackish water treatment has been widely studied but currently still suffers from relatively low efficiency. Therefore, a rational design of promising electrode materials has become an urgent task. In this study, a so-called pore-on-pore strategy was developed by chemical activation of the intrinsic porous renewable precursor to generate a micro–meso hierarchical porous carbon. The synergistic effect of the biocomponent and activation agent is the major mechanism for the high porosity. The synthetic carbon has a very high specific surface area (2147.43 m2 g–1). In addition, the carbon exhibits good performance in terms of electroadsorption, with adsorption capacities of 19.35 and 30.64 mg g–1 in solutions with initial concentrations of 500 and 1500 mg L–1 NaCl under 1.2 V applied voltage, respectively. A capacitance retention of 98.7% and charging efficiency of 98.3% were achieved after 100 uninterrupted charge and discharge cycles, indicating relatively good regeneration performance. This research provides a bright way to develop an excellent performance electrode from renewable resources for environmental applications.

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Section: Resultsmentioning

confidence: 99%

Hierarchical Porous Carbon from the Synergistic “Pore-on-Pore” Strategy for Efficient Capacitive Deionization

Wang

Wei

Gang

et al. 2019

ACS Sustainable Chem. Eng.

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“…SAC was 20.93 mg/g, which was ascribed to the tunable pore size of the material. Furthermore, Mi et al (2019) applied hierarchical composite of nitrogen doped carbon sphere and holey graphene hydrogel comprising of in-plane pores. The composite showed high hydrophilicity and high conductivity having numerous channels for ion transport and access the entire surface area of the material.…”

Section: Graphene-based Materialsmentioning

confidence: 99%

Recent progress in materials and architectures for capacitive deionization: A comprehensive review

Datar

Mane

Jha

2022

Water Environment Research

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Capacitive deionization is an emerging and rapidly developing electrochemical technique for water desalination across the globe with exponential growth in publications. There are various architectures and materials being explored to obtain utmost electrosorption performance. The symmetric architectures consist of the same material on both electrodes, while asymmetric architectures have electrodes loaded with different materials. Asymmetric architectures possess higher electrosorption performance as compared with that of symmetric architectures owing to the inclusion of either faradaic materials, redox‐active electrolytes, or ion specific pre‐intercalation material. With the materials perspective, faradaic materials have higher electrosorption performance than carbon‐based materials owing to the occurrence of faradaic reactions for electrosorption. Moreover, the architecture and material may be tailored in order to obtain desired selectivity of the target component and heavy metal present in feed water. In this review, we describe recent developments in architectures and materials for capacitive deionization and summarize the characteristics and salt removal performances. Further, we discuss recently reported architectures and materials for the removal of heavy metals and radioactive materials. The factors that affect the electrosorption performance including the synthesis procedure for electrode materials, incorporation of additives, operational modes, and organic foulants are further illustrated. This review concludes with several perspectives to provide directions for further development in the subject of capacitive deionization. Practitioner Points Capacitive deionization (CDI) is a rapidly developing electrochemical water desalination technique with exponential growth in publications. Faradaic materials have higher salt removal capacity (SAC) because of reversible redox reactions or ion‐intercalation processes. Combination of CDI with other techniques exhibits improved selectivity and removal of heavy metals. Operational parameters and materials properties affect SAC. In future, comprehensive experimentation is needed to have better understanding of the performance of CDI architectures and materials.

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“…On the contrary, in-plane mesopores (2-50 nm), present within individual graphene planes, have rarely been exploited in electrocatalysts, although they may be capable of entirely interconnecting the interlayer macropores, and thus providing favorable shortcuts for efficient ionic diffusion, as reported in recent studies on supercapacitors [24][25][26]. In this regard, hierarchically porous graphene composed of both interlayer macropores and in-plane mesopores could serve as an ideal catalyst support for electrocatalysis, not only ensuring favorable exposure of active sites accessible to the regents, but also enabling substantially improved mass transfer and charge transport [27]. However, studies regarding the combination of such a graphene architecture with abundant active sites for reversible oxygen electrocatalysis are scarce.…”

Section: Introductionmentioning

confidence: 99%

3D hierarchically macro-/mesoporous graphene frameworks enriched with pyridinic-nitrogen-cobalt active sites as efficient reversible oxygen electrocatalysts for rechargeable zinc-air batteries

Zhou¹,

Qin²,

Zhao³

et al. 2021

Chinese Journal of Catalysis

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Hierarchical composite of N-doped carbon sphere and holey graphene hydrogel for high-performance capacitive deionization

Cited by 82 publications

References 42 publications

Hierarchical Porous Carbon from the Synergistic “Pore-on-Pore” Strategy for Efficient Capacitive Deionization

Hierarchical Porous Carbon from the Synergistic “Pore-on-Pore” Strategy for Efficient Capacitive Deionization

Recent progress in materials and architectures for capacitive deionization: A comprehensive review

3D hierarchically macro-/mesoporous graphene frameworks enriched with pyridinic-nitrogen-cobalt active sites as efficient reversible oxygen electrocatalysts for rechargeable zinc-air batteries

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