MXene-supported Co<sub>3</sub>O<sub>4</sub>quantum dots for superior lithium storage and oxygen evolution activities

Wang, Chuang; Zhu, Xiaodong; Mao, Yong; Wang, Fang; Gao, Xiaotian; Qiu, Sheng-You; Le, Shiru; Sun, Kening

doi:10.1039/c8cc09699f

Cited by 105 publications

(30 citation statements)

References 44 publications

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“…As the charge–discharge cycle progresses, the internal active sites are gradually activated, which results in the increase in capacitance. [ 39,40 ] On the other hand, this phenomenon may be due to the oxidation of transition metal V in V 2 CT x , and after oxidation, the electrochemical activity of V layers is fully activated and leads to excellent electrochemical performance. [ 41 ]…”

Section: Resultsmentioning

confidence: 99%

Enhanced Reversible Capacity and Cyclic Performance of Lithium‐Ion Batteries Using SnO₂ Interpenetrated MXene V₂C Architecture as Anode Materials

Liu

Wang

et al. 2020

Energy Tech

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As an anode material, SnO2 nanoparticles have the problem of volume expansion and agglomeration, limiting their applications in energy storage. Herein, a nanocomposite material with hybridization structure using SnO2 interpenetrated MXene V2C as an anode for Li‐ion battery is fabricated by a simple method. The laminated structure of V2C can restrain the volume expansion of SnO2 nanoparticles anchored on the surface of V2C layers, whereas the intercalation of SnO2 nanoparticles into the V2CTx layer can effectively prevent the restacking of the V2CTx nanosheets in charging and discharging processes. This heterogeneous structure enables high Li‐ion storage on the surface and in the near‐surface region, which results in rapid transport of Li ions and optimizes the rate performance and cycling property. Consequently, the V2CTx@SnO2 nanocomposite has a large reversible capacity of ≈768 mAh g−1 after 200 cycles at a current density of 1000 mA g−1. Competitively, its reversible capacity can reach 260 mAh g−1 at high current density of 8000 mA g−1 after 1000 cycles, showing excellent cycling stability and superior rate capability. In addition to the high Li‐ion capacity offered by the composite structure, the anode also maintains the structural and mechanical integrity provided by MXene in charging and discharging processes.

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Section: Resultsmentioning

confidence: 99%

Enhanced Reversible Capacity and Cyclic Performance of Lithium‐Ion Batteries Using SnO₂ Interpenetrated MXene V₂C Architecture as Anode Materials

Liu

Wang

et al. 2020

Energy Tech

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“…The Ti region shows two pairs of 2p 3/2 /2p 1/2 doublets for the Ti–C (455.6 eV) and Ti–O (457.3 eV) species [21]. The Co 2p spectrum features three prominent species: Co 2+ (782.6 eV for 2p 3/2 ), Co 3+ (781.5 eV for 2p 3/2 ) and satellite (787.2 eV) [24]. The MXene has an abundant number of surface termination groups (e.g., –O, –OH, and –F), which could adsorb the Co 2+ /Ni 2+ ions on the MXene surface and may change the Co/Ni oxidation during the pyrolysis process in the inert atmosphere.…”

Section: Resultsmentioning

confidence: 99%

MXene Boosted CoNi-ZIF-67 as Highly Efficient Electrocatalysts for Oxygen Evolution

Wen

Wei

et al. 2019

Nanomaterials

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Oxygen evolution reaction (OER) is a pivotal step for many sustainable energy technologies, and exploring inexpensive and highly efficient electrocatalysts is one of the most crucial but challenging issues to overcome the sluggish kinetics and high overpotentials during OER. Among the numerous electrocatalysts, metal-organic frameworks (MOFs) have emerged as promising due to their high specific surface area, tunable porosity, and diversity of metal centers and functional groups. It is believed that combining MOFs with conductive nanostructures could significantly improve their catalytic activities. In this study, an MXene supported CoNi-ZIF-67 hybrid (CoNi-ZIF-67@Ti3C2Tx) was synthesized through the in-situ growth of bimetallic CoNi-ZIF-67 rhombic dodecahedrons on the Ti3C2Tx matrix via a coprecipitation reaction. It is revealed that the inclusion of the MXene matrix not only produces smaller CoNi-ZIF-67 particles, but also increases the average oxidation of Co/Ni elements, endowing the CoNi-ZIF-67@Ti3C2Tx as an excellent OER electrocatalyst. The effective synergy of the electrochemically active CoNi-ZIF-67 phase and highly conductive MXene support prompts the hybrid to process a superior OER catalytic activity with a low onset potential (275 mV vs. a reversible hydrogen electrode, RHE) and Tafel slope (65.1 mV∙dec−1), much better than the IrO2 catalysts and the pure CoNi-ZIF-67. This work may pave a new way for developing efficient non-precious metal catalyst materials.

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“…Porous Ti 3 C 2 T x /NiAl LDH composites were prepared by a liquid phase deposition method, with more active sites and higher electrolyte penetration . However, Ti 3 C 2 T x is vulnerable to oxidation in heating conditions, which give rise to the loss of conductivity. , In order to figure out this problem, the structure of the hybrid electrode materials requires a more well-honed design. The self-assembly method, as a conventional soft chemical method, is often used to prepare a variety of composite materials.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of Alternating Stacked 2D/2D Ti₃C₂T_x MXene/ZnMnNi LDH van der Waals Heterostructures with Ultrahigh Supercapacitive Performance

Sun

Zuo

Sun

et al. 2020

ACS Appl. Energy Mater.

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In the field of energy storage, layered double hydroxides (LDHs) have aroused researchers' extensive attentions because of their low cost, high theoretical specific capacitance (SC), and adjustable interlayer structure. Notably, the appearance of single-layer or few-layer LDHs nanosheets has addressed the puzzle of large wall thickness and shows a large specific surface area which produces more active sites. However, the cyclic stability of the LDHs nanosheets has been hindered, which result from their poor conductivity, weak structural stability and natural stacking, so the usefulness of them is limited in practice. In this work, exfoliated twodimensional (2D) MXene (F-MXene)/exfoliated 2D ZnMnNi LDH (F-ZnMnNi LDH) van der Waals heterostructures were successfully fabricated by using electrostatic self-assembly between negatively titanium carbide F-MXene nanosheets and positively charged F-ZnMnNi LDH nanosheets. The as-prepared 2D/2D van der Waals heterostructures integrate the advantages of F-MXene and F-ZnMnNi LDH, including outstanding electron conductivity, stable structure, and superior redox activity. Accordingly, the as-prepared sample exhibits ultrahigh SC of 2065 F/g at a scan rate of 5 mV/s and remarkable cycling stability with capacitance retention of 99.8% after 100 000 cycles at a current density of 1 A/g.

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MXene-supported Co₃O₄quantum dots for superior lithium storage and oxygen evolution activities

Abstract: A novel hybrid, composed of Co3O4quantum dots supported on Ti3C2Tx(MXene) nanosheets, exhibits a strong synergetic effect, and shows superior lithium storage (capacity = 766.5 mA h g−1at 2 A g−1after 400 cycles) and oxygen evolution (overpotential = 340 mV at 10 mA cm−2) activities.

Cited by 105 publications

References 44 publications

Enhanced Reversible Capacity and Cyclic Performance of Lithium‐Ion Batteries Using SnO₂ Interpenetrated MXene V₂C Architecture as Anode Materials

Enhanced Reversible Capacity and Cyclic Performance of Lithium‐Ion Batteries Using SnO₂ Interpenetrated MXene V₂C Architecture as Anode Materials

MXene Boosted CoNi-ZIF-67 as Highly Efficient Electrocatalysts for Oxygen Evolution

Self-assembly of Alternating Stacked 2D/2D Ti₃C₂T_x MXene/ZnMnNi LDH van der Waals Heterostructures with Ultrahigh Supercapacitive Performance

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MXene-supported Co3O4quantum dots for superior lithium storage and oxygen evolution activities

Abstract: A novel hybrid, composed of Co3O4quantum dots supported on Ti3C2Tx(MXene) nanosheets, exhibits a strong synergetic effect, and shows superior lithium storage (capacity = 766.5 mA h g−1at 2 A g−1after 400 cycles) and oxygen evolution (overpotential = 340 mV at 10 mA cm−2) activities.

Cited by 105 publications

References 44 publications

Enhanced Reversible Capacity and Cyclic Performance of Lithium‐Ion Batteries Using SnO2 Interpenetrated MXene V2C Architecture as Anode Materials

Enhanced Reversible Capacity and Cyclic Performance of Lithium‐Ion Batteries Using SnO2 Interpenetrated MXene V2C Architecture as Anode Materials

MXene Boosted CoNi-ZIF-67 as Highly Efficient Electrocatalysts for Oxygen Evolution

Self-assembly of Alternating Stacked 2D/2D Ti3C2Tx MXene/ZnMnNi LDH van der Waals Heterostructures with Ultrahigh Supercapacitive Performance

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MXene-supported Co₃O₄quantum dots for superior lithium storage and oxygen evolution activities

Enhanced Reversible Capacity and Cyclic Performance of Lithium‐Ion Batteries Using SnO₂ Interpenetrated MXene V₂C Architecture as Anode Materials

Enhanced Reversible Capacity and Cyclic Performance of Lithium‐Ion Batteries Using SnO₂ Interpenetrated MXene V₂C Architecture as Anode Materials

Self-assembly of Alternating Stacked 2D/2D Ti₃C₂T_x MXene/ZnMnNi LDH van der Waals Heterostructures with Ultrahigh Supercapacitive Performance