Layer-by-layer self-assembled two-dimensional MXene/layered double hydroxide composites as cathode for alkaline hybrid batteries

Dong, Xiaowan; Zhang, Xiaogang; Ding, Bing; Hao, Xiaodong; Dou, Hui

doi:10.1016/j.jpowsour.2018.04.058

Cited by 60 publications

(32 citation statements)

References 47 publications

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“…[40] Moving from the MAX phase to the MXenes, all the peaks undergo a shift to higher binding energy associated to an incremented environmental electronegativity. The Ti 4+ species has been associated with surface impurities such as TiO 2 , [40,43] mixed carboxides TiC x O y , [44] and to Ti-O termination in the MXene structure, [44,45] while the Ti 3+ , Ti 2+ , and Ti 1+ components have been generally associated solely with MXene Ti species with formal oxidation states related to different terminations (Ti-T). The surface TiC impurity (detected from the analysis of XRD patterns) presents also peaks in this BEs range.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Functional Properties of Ti₃C₂T_x MXenes as Negative Electrodes in Sodium‐Ion Batteries by Chemical Tuning

et al. 2020

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The large implementation of electrochemical energy storage devices requires the development of new chemistries tailored for specific uses. Sodium‐ion batteries (SIBs) can cover different application fields, however the state‐of‐the‐art negative material, hard carbon, suffers from poor cyclability and rate capability. MXenes are a vast class of 2D‐materials of the general formula Mn+1XnTx (M = transition metal, X = C or N, and T = M‐terminating group) with peculiar structural features able to reversible intercalate chemical species, such as alkaline cations. The MXene compound Ti3C2Tx is one of the most investigated, thanks to the easy preparation route by etching of the pristine compound Ti3AlC2. In this work, the effect of the etching conditions and of the postsynthesis thermal treatments on the chemical, morphological, and structural properties of Ti3C2Tx are investigated, and in turn the correlation between its features and the functional properties as negative materials in SIBs are studied. The Ti3C2Tx obtained in high hydrofluoric concentration and after a 300 °C thermal treatment shows 110 mAh g−1 at 30 mA g−1 with an average potential of 1.33 V versus Na+/Na, 100% and good rate capability, since it is still able to deliver 73 mAh g−1 at 1500 mA g−1.

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Section: Resultsmentioning

confidence: 99%

Enhanced Functional Properties of Ti₃C₂T_x MXenes as Negative Electrodes in Sodium‐Ion Batteries by Chemical Tuning

et al. 2020

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“…Ad etailed analysis of the electrochemical reactions possibly occurring in CDI operation without membranes can be found in Refs. [50,56].…”

Section: Basic Electrochemical Characterization In Aqueous 1 M Naclmentioning

confidence: 99%

Charge and Potential Balancing for Optimized Capacitive Deionization Using Lignin‐Derived, Low‐Cost Activated Carbon Electrodes

et al. 2018

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Lignin-derived carbon is introduced as a promising electrode material for water desalination by using capacitive deionization (CDI). Lignin is a low-cost precursor that is obtained from the cellulose and ethanol industries, and we used carbonization and subsequent KOH activation to obtain highly porous carbon. CDI cells with a pair of lignin-derived carbon electrodes presented an initially high salt adsorption capacity but rapidly lost their beneficial desalination performance. To capitalize on the high porosity of lignin-derived carbon and to stabilize the CDI performance, we then used asymmetric electrode configurations. By using electrodes of the same material but with different thicknesses, the desalination performance was stabilized through reduction of the potential at the positive electrode. To enhance the desalination capacity further, we used cell configurations with different materials for the positive and negative electrodes. The best performance was achieved by a cell with lignin-derived carbon as a negative electrode and commercial activated carbon as a positive electrode. Thereby, a maximum desalination capacity of 18.5 mg g was obtained with charge efficiency over 80 % and excellent performance retention over 100 cycles. The improvements were related to the difference in the potential of zero charge between the electrodes. Our work shows that an asymmetric cell configuration is a powerful tool to adapt otherwise inappropriate CDI electrode materials.

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“…This approach overcomes the difficulties of producing ultrathin NiMn LDH nanosheets by conventional exfoliating methods. [29] Figure 1a and c present the morphology of two kinds of structure, which shows well monodispersed with average diameters of 3 μm and 2 μm, respectively. The high magnification SEM images of Figure 1b and d show that the NML and UNML microspheres comprise numerous cross linked nanosheets with highly open morphology.…”

Section: Resultsmentioning

confidence: 99%

“…For example, Dong et al fabricated heterostructure of Ti 3 C 2 T x /CoAl-LDH through electrostatic self-assembly, the as-prepared 2D composite greatly reduced the resistance of Faraday reaction and achieved excellent rate capability (78 % at 10 A g À 1 ) and excellent cycling stability (90 % after 5000 cycles at 4 A g À 1 ). [29] In addition, Li et al synthesized NiMn LDH nanosheets with a thickness of 1.3 nm by ultrasonic irradiation at room temperature, showing outstanding electrocatalytic water oxidation activity. [30] In this work, we first report a facile one-step method to fabricate a three-dimensional multilevel structure supported by ultrathin NiMn LDH nanosheets, by introducing EN as a guide agent of nanoparticles assembly.…”

Section: Introductionmentioning

confidence: 99%

One‐Step Synthesis of Ultrathin NiMn Layered Double Hydroxide Nanosheets for Supercapacitors

et al. 2019

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With the help of ethylenediamine (EN), we built through hydrothermal synthesis a multiple‐level NiMn layered double hydroxide nanostructure consisting of ultrathin nanosheets (UNML) with plenty buffer spaces. Such porous structure provides more active sites, shortens the diffusion path of electrolyte ions, and creates massive “live volume” to ensure structural integrity during long‐term cycling. The UNML possesses high specific capacitance (1513 F g−1 at 1 A g−1). Moreover, the hybrid supercapacitor employing UNML and AC as positive and negative electrode delivers enhanced energy density up to 59 Wh kg−1 at a power density of 808 W kg−1 and robust cycling stability with capacitance degradation of 8.7 % after 5000 cycles. This simple strategy is expected to cope with the prevalent issues facing battery‐type electrode materials, ensuring improvement of the overall electrochemical performance.

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Layer-by-layer self-assembled two-dimensional MXene/layered double hydroxide composites as cathode for alkaline hybrid batteries

Cited by 60 publications

References 47 publications

Enhanced Functional Properties of Ti₃C₂T_x MXenes as Negative Electrodes in Sodium‐Ion Batteries by Chemical Tuning

Enhanced Functional Properties of Ti₃C₂T_x MXenes as Negative Electrodes in Sodium‐Ion Batteries by Chemical Tuning

Charge and Potential Balancing for Optimized Capacitive Deionization Using Lignin‐Derived, Low‐Cost Activated Carbon Electrodes

One‐Step Synthesis of Ultrathin NiMn Layered Double Hydroxide Nanosheets for Supercapacitors

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Layer-by-layer self-assembled two-dimensional MXene/layered double hydroxide composites as cathode for alkaline hybrid batteries

Cited by 60 publications

References 47 publications

Enhanced Functional Properties of Ti3C2Tx MXenes as Negative Electrodes in Sodium‐Ion Batteries by Chemical Tuning

Enhanced Functional Properties of Ti3C2Tx MXenes as Negative Electrodes in Sodium‐Ion Batteries by Chemical Tuning

Charge and Potential Balancing for Optimized Capacitive Deionization Using Lignin‐Derived, Low‐Cost Activated Carbon Electrodes

One‐Step Synthesis of Ultrathin NiMn Layered Double Hydroxide Nanosheets for Supercapacitors

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Enhanced Functional Properties of Ti₃C₂T_x MXenes as Negative Electrodes in Sodium‐Ion Batteries by Chemical Tuning

Enhanced Functional Properties of Ti₃C₂T_x MXenes as Negative Electrodes in Sodium‐Ion Batteries by Chemical Tuning