Journal ArticleDOI
More Ca 2+ , Less Na + : Increasethe Desalination Capacity and Performance Stability of Na x Ca y CoO 2
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TLDR
In this paper, an asymmetric Faradaic deionization (FDI) device assembled by Ca2+decorated NaxCoO2 (x ≤ 0.71, y ≥ 0.05) as the negative electrode and activated carbon as the positive electrode was developed.Abstract:
Faradaic deionization (FDI) provides an effective solution to respond to the global water crisis. However, the ions intercalation/deintercalation process with multiple redox reactions leads to structural collapse and unstable cyclability. Here, we develop an asymmetrical FDI device assembled by Ca2+-decorated NaxCoO2 (x ≤ 0.71, y ≤ 0.05) as the Faradaic negative electrode and activated carbon as the positive electrode. Na0.27Ca0.03CoO2·0.6H2O was synthesized via a facile sol–gel and chemical oxidation method, which delivered a desalination capacity of 83.5 ± 2.4 mg g–1 and a charge efficiency close to 1, and an inappreciable capacity fading was observed after 50 cycles. It is found that the presence of Ca2+ residing in the face-sharing sites helps to maintain the layered structure and promotes efficient deintercalation of Na+ by anchoring the CoO2 slabs, which results in its unexpected desalination capacity and good cyclability. Moreover, electrochemical quartz-crystal microbalance (EQCM) was successfully...read more
Citations
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Journal ArticleDOI
Long-term electrocatalytic N2 fixation by MOF-derived Y-stabilized ZrO2: insight into the deactivation mechanism
TL;DR: In this paper, a MOF-derived carbon/Y-stabilized ZrO2 nanocomposite (C@YSZ) was used as an efficient electrocatalyst for NRR in 0.1 M Na2SO4.
Journal ArticleDOI
An insight into the promotion effect of Na+/vacancy ordering on desalination performance of NaxCoO2
TL;DR: In this article, an asymmetrical FDI device was developed where NaxCoO2 as the Faradic electrode material and AC act as the Cl-storage electrode material for the first time to explore the effect of Na+/vacancy ordering on desalination performance.
Journal ArticleDOI
A Review of Battery Materials as CDI Electrodes for Desalination
TL;DR: In this paper, a variety of battery materials have been developed due to the urgent demand for energy storage, which increases the choices of CDI electrode materials largely, revealing a bright future of integrating battery materials with CDI technology.
Journal ArticleDOI
Enhanced Desalination Capacity and Stability of Alkylamine-Modified Na0.71CoO2 for Capacitive Deionization
Ruijuan Zhou,Mingyuan Wang,Wenhui Wei,Jiaxuan Li,Yunxiao Tong,Bin Liang,Fuming Chen,Guiwu Liu,Min Luo +8 more
TL;DR: Simultaneously regulating the physical properties and chemical environment of interlayer is a critical need for enhancing the capacity and stability of layered electrode materials in energy and env... as mentioned in this paper,...
Journal ArticleDOI
Revealing the role of the amorphous phase in Na0.74CoO2/C/N composite cathode
TL;DR: In this article, a series of Na0·74CoO2/C/N-based composites were fabricated by sintering the mixtures of ZIF-4(Co) (Co [H2C3N2]2) and Na2CO3.
References
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Journal ArticleDOI
An advanced cathode for Na-ion batteries with high rate and excellent structural stability
TL;DR: Excellent cycling properties and high rate capability can be obtained by limiting the oxygen framework shift during P2-O2 phase transformation, suggesting that this material can be a strong candidate as a sustainable low-cost Na-ion battery cathode.
Journal ArticleDOI
Faradaic reactions in capacitive deionization (CDI) - problems and possibilities: A review.
TL;DR: An overview of the types and mechanisms of Faradaic reactions in CDI systems including anodic oxidation of carbon electrodes, cathodic reduction of oxygen and FarADAic ion storage are presented and their apparent negative and positive effects on water desalination are identified.
Journal ArticleDOI
MXene as a novel intercalation-type pseudocapacitive cathode and anode for capacitive deionization
Pattarachai Srimuk,Pattarachai Srimuk,Friedrich Kaasik,Friedrich Kaasik,Benjamin Krüner,Benjamin Krüner,Aura Tolosa,Aura Tolosa,Simon Fleischmann,Nicolas Jäckel,Nicolas Jäckel,Mehmet C. Tekeli,Mehmet C. Tekeli,Mesut Aslan,Matthew E. Suss,Volker Presser,Volker Presser +16 more
Abstract: In this proof-of-concept study, we introduce and demonstrate MXene as a novel type of intercalation electrode for desalination via capacitive deionization (CDI). Traditional CDI cells employ nanoporous carbon electrodes with significant pore volume to achieve a large desalination capacity via ion electrosorption. By contrast, MXene stores charge by ion intercalation between the sheets of its two-dimensional nanolamellar structure. By this virtue, it behaves as an ideal pseudocapacitor, that is, showing capacitive electric response while intercalating both anions and cations. We synthesized Ti3C2-MXene by the conventional process of etching ternary titanium aluminum carbide i.e., the MAX phase (Ti3AlC2) with hydrofluoric acid. The MXene material was cast directly onto the porous separator of the CDI cell without added binder, and exhibited very stable performance over 30 CDI cycles with an average salt adsorption capacity of 13 ± 2 mg g−1.
Journal ArticleDOI
In situ NMR and electrochemical quartz crystal microbalance techniques reveal the structure of the electrical double layer in supercapacitors
John M. Griffin,Alexander C. Forse,Wan-Yu Tsai,Pierre-Louis Taberna,Patrice Simon,Clare P. Grey +5 more
TL;DR: In situ NMR is used to directly quantify the populations of anionic and cationic species within a working microporous carbon supercapacitor electrode and shows that charge storage mechanisms are different for positively and negatively polarized electrodes for the electrolyte tetraethylphosphonium tetrafluoroborate in acetonitrile.
Journal ArticleDOI
Porous Cryo-Dried MXene for Efficient Capacitive Deionization
TL;DR: In this article, a vacuum freeze-drying process was employed to prevent the restacking of MXene nanosheets due to van der Waals forces, leading to the formation of a porous structure with a large specific surface area.