A confinement strategy to in-situ prepare a peanut-like N-doped, C-wrapped TiO2 electrode with an enhanced desalination capacity and rate for capacitive deionization

Liang, Mingxing; Bai, Xueting; Yu, Fei; Ma, Jie

doi:10.1007/s12274-020-3097-x

Cited by 31 publications

(20 citation statements)

References 45 publications

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“…Ion intercalation or conversion reactions (charge-transfer materials) enable a much higher desalination capacity than possible for carbon-based electrodes because of the higher charge storage capacity and perm-selectivity; thereby, they enable facile desalination even at high molar strength. Currently, various charge-transfer materials for electrochemical desalination have been reported, such as transition metal oxides (MnO 2 , TiO 2 , V 2 O 5 , and ZnFe 2 O 4 ) [8][9][10][11], Prussian blue analogs (nickel hexacyanoferrate) [12][13][14], polyanionic phosphates (Na 3 V 2 (PO 4 ) 3 , Na 3 Ti 2 (PO 4 ) 3 ) [15][16][17], and two-dimensional materials (MXenes, MoS 2 , and TiS 2 ) [18][19][20][21][22]. Among these materials, metal oxides or hydroxides hold the advantages of easy preparation, facile morphological manipulation, element diversity, and promising desalination performance.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…Liang et al, achieved in situ preparation of N-TiO 2 /C by a one-step hydrothermal reaction. [188] Researchers have also tried strategic experimental approaches to produce TiO 2 [114] Copyright 2017, Wiley-VCH. NPs efficiently contacted with in situ formed g-C 3 N 4 NSs, [187] or RGO, during the development of TiO 2 /C composites.…”

Section: Wwwadvmatde Wwwadvancedsciencenewscommentioning

confidence: 99%

“…Liang et al, achieved in situ preparation of N‐TiO 2 /C by a one‐step hydrothermal reaction. [ 188 ] Researchers have also tried strategic experimental approaches to produce TiO 2 NPs efficiently contacted with in situ formed g‐C 3 N 4 NSs, [ 187 ] or RGO, during the development of TiO 2 /C composites. [ 189 ] As demonstrated in Figure 24b, the TiO 2 /C/g‐C 3 N 4 or TiO 2 /RGO heterojunctions produced outstanding characteristics and enhanced functions.…”

Section: The Chemistry Of Mxene‐derived Oxidesmentioning

confidence: 99%

Recent Advances in Oxidation Stable Chemistry of 2D MXenes

et al. 2022

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As an emerging star of 2D nanomaterials, 2D transition metal carbides and nitrides, named MXenes, present a large potential in various research areas owing to their intrinsic multilayer structure and intriguing physico‐chemical properties. However, the fabrication and application of functional MXene‐based devices still remain challenging as they are prone to oxidative degradation under ambient environment. Within this review, the preparation methods of MXenes focusing on the recent investigations on their thermal structure–stability relationships in inert, oxidizing, and aqueous environments are systematically introduced. Moreover, the key factors that affect the oxidation of MXenes, such as, atmosphere, temperature, composition, microstructure, and aqueous environment, are reviewed. Based on different scenarios, strategies for avoiding or delaying the oxidation of MXenes are proposed to encourage the utilization of MXenes in complicated environments, especially at high temperature. Furthermore, the chemistry of MXene‐derived oxides is analyzed, which can offer perspectives on the further design and fabrication of novel 2D composites with the unique structures of MXenes being preserved.

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“…Instead of conventional static electrodes, the flow electrodes possess the several orders of magnitude active materials, which expands the electrosorption capacity dramatically. Most plate-type CDI units only explored the low concentration regime in the range of 20–50 mM NaCl. ,− Some studies have demonstrated that the FCDI system has the ability to treat the feed solution with a high total dissolved solid (TDS) content up to the level of seawater (∼35 000 mg L –1 ) . As opposed to plate-type CDI, the carbon slurry from the anodic and cathodic chambers is mixed in the electrode reservoir for in situ regeneration of the flow electrode, obtaining pseudoinfinite electrosorption capacity and continuous desalination without intermittent regeneration.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Desalination Performance by a Novel Archimedes Spiral Flow Channel for Flow-Electrode Capacitive Deionization

Zhang

Zhou

et al. 2022

ACS EST Eng.

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As an emerging desalination technology, flow-electrode capacitive deionization (FCDI) has aroused extensive attraction due to its advantage of pseudoinfinite adsorption capacity. However, some problems still remain in the traditional FCDI devices, i.e., its streaming and seeping quality which has severely limited the progress. Herein, some improvements were achieved by changing the direction of saline water in spacer. Furthermore, the Archimedes spiral flow channel model was introduced to improve the flow behavior of carbon slurry in the FCDI unit cell for the first time, which has vastly boosted the desalination performance of FCDI devices. The computational fluid dynamics (CFD) simulation revealed the more uniform velocity distribution and longer residence time of carbon slurry in spiral flow channels to enhance the desalination, while the flow rate of carbon slurry in a straight line is faster but slower in the corner of serpentine flow channels, causing a negative effect on the desalination performance. After long-term continuous desalination in 3.5 g L–1 NaCl solution at 2.4 V, 99.88% of salt removal efficiency was achieved with a superior salt removal rate of 4.06 μmol cm–2 min–1 and 98.9% charge efficiency for the spiral flow channel FCDI device, demonstrating a stable desalination performance.

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A confinement strategy to in-situ prepare a peanut-like N-doped, C-wrapped TiO2 electrode with an enhanced desalination capacity and rate for capacitive deionization

Cited by 31 publications

References 45 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 Advances in Oxidation Stable Chemistry of 2D MXenes

Enhanced Desalination Performance by a Novel Archimedes Spiral Flow Channel for Flow-Electrode Capacitive Deionization

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