An integrated large-scale and vertically aligned Co(OH)2 nanosheet@graphite paper electrode for high performance capacitive deionization of saline water

Wen, Xiaoru; Zhao, Meiqi; Zhang, Dongxu; Ma, Xiangdong; Lin, Zhiqiang; Ye, Meidan

doi:10.1016/j.desal.2019.114117

Cited by 27 publications

(21 citation statements)

References 34 publications

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“…S9 ), h-Co(OH) 2 shows better desalination performance than commercial Co(OH) 2 nanosheet, proving the positive effect of hollow configuration. Moreover, h-Co(OH) 2 presents higher capacity than pure Co(OH) 2 on graphite paper (48 mg·g −1 ) and interconnected hollow graphene shell (14 mg·g −1 ) proposed recently [ 29 , 46 ].…”

Section: Resultsmentioning

confidence: 98%

Three-Dimensional Cobalt Hydroxide Hollow Cube/Vertical Nanosheets with High Desalination Capacity and Long-Term Performance Stability in Capacitive Deionization

Xiong

Arnold

et al. 2021

Research

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Faradaic electrode materials have significantly improved the performance of membrane capacitive deionization, which offers an opportunity to produce freshwater from seawater or brackish water in an energy-efficient way. However, Faradaic materials hold the drawbacks of slow desalination rate due to the intrinsic low ion diffusion kinetics and inferior stability arising from the volume expansion during ion intercalation, impeding the engineering application of capacitive deionization. Herein, a pseudocapacitive material with hollow architecture was prepared via template-etching method, namely, cuboid cobalt hydroxide, with fast desalination rate (3.3 mg (NaCl)·g-1 (h-Co(OH)2)·min-1 at 100 mA·g-1) and outstanding stability (90% capacity retention after 100 cycles). The hollow structure enables swift ion transport inside the material and keeps the electrode intact by alleviating the stress induced from volume expansion during the ion capture process, which is corroborated well by in situ electrochemical dilatometry and finite element simulation. Additionally, benefiting from the elimination of unreacted bulk material and vertical cobalt hydroxide nanosheets on the exterior surface, the synthesized material provides a high desalination capacity (117±6 mg (NaCl)·g-1 (h-Co(OH)2) at 30 mA·g-1). This work provides a new strategy, constructing microscale hollow faradic configuration, to further boost the desalination performance of Faradaic materials.

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Section: Resultsmentioning

confidence: 98%

Three-Dimensional Cobalt Hydroxide Hollow Cube/Vertical Nanosheets with High Desalination Capacity and Long-Term Performance Stability in Capacitive Deionization

Xiong

Arnold

et al. 2021

Research

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“…Hybrid CDI architecture was used including as‐synthesized oxygen‐incorporated molybdenum disulfide and Ag‐coated carbonas electrode materials, exhibiting SAC of 28.85 mg/g. Wen et al (2019) reported in situ synthesis of tin disulfide (SnS 2 ) nanosheet on graphite paper (Wen, Zhao, Zhang, et al, 2020). The vertically aligned and well‐interconnected SnS 2 nanosheets on graphite paper exhibit high specific surface area, better hydrophilicity and promising ion‐diffusion pathway.…”

Section: Materials Perspectivementioning

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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“…6–8 To improve the inherently low thermal conductivity of epoxy resin, various fillers are added to matrix, including metal nanoparticles such as Ag, 9 metal oxides such as Al 2 O 3 , 10 metal nitrides such as BN, 11 graphene, and carbon nanotubes (CNT). 11–18 Among these fillers, h-BN is considered to be highly suitable material. 19–21 When the h-BN powder is peeled off, its thermal conductivity will be significantly advanced.…”

Section: Introductionmentioning

confidence: 99%

Novle layered boron nitride nanosheets/cellulose nanofibers/epoxy composite with high thermal conductivity

et al. 2021

High Performance Polymers

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Studies have shown that the construction of a three-dimensional interconnected filler network is an effective method to improve the thermal conductivity of the through-plane under a lower filler load. However, huge challenges still exist in building a long-range layered filler network and reducing the thermal resistance resulting from contact between fillers and matrix. In this work, boron nitride nanosheets (BNNSs) were proposed to be connected with modified cellulose nanofibers (CNFs) to obtain a long-range layered structure filler skeleton by bidirectional freezing orientation. Then epoxy resin was dipped under vacuum condition to prepare composite with thermal conductivity up to 1.43 W/mK in through-plane when filler content is 4.3 vol%, and the composite had low thermal expansion coefficient of 64.1 ppm/°C and excellent volume resistivity up to 3.7 × 1012 Ω cm at the same time.

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An integrated large-scale and vertically aligned Co(OH)2 nanosheet@graphite paper electrode for high performance capacitive deionization of saline water

Cited by 27 publications

References 34 publications

Three-Dimensional Cobalt Hydroxide Hollow Cube/Vertical Nanosheets with High Desalination Capacity and Long-Term Performance Stability in Capacitive Deionization

Three-Dimensional Cobalt Hydroxide Hollow Cube/Vertical Nanosheets with High Desalination Capacity and Long-Term Performance Stability in Capacitive Deionization

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

Novle layered boron nitride nanosheets/cellulose nanofibers/epoxy composite with high thermal conductivity

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