A single step in-situ process for improvement in electron emission properties of surface-modified carbon nanotubes (CNTs): Titanium dioxide nanoparticles attachment

Raza, Mohammad Moeen Hasan; Sadiq, Mohd; Khan, Sunny; Zulfequar, M.; Husain, M.; Husain, Samina

doi:10.1016/j.diamond.2020.108139

Cited by 15 publications

(4 citation statements)

References 92 publications

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“…The peaks at 290 cm −1 , 384 cm −1 and 618 cm −1 represent the E g group vibrations of Ti, C and terminal atoms [34,35]. Two broad peaks located at 1358 and 1588 cm −1 can be obtained in MC-5, corresponding to the D and G bands of CNTs [36], verifying the successful introduction of CNTs. As to MXene, there is a small bump around 1570 cm −1 , indicating the existence of amorphous carbon [37].…”

Section: Characterization Of Structures and Morphologiesmentioning

confidence: 74%

Enhanced tensile and electrochemical performance of MXene/CNT hierarchical film

Zhao

Liang

et al. 2021

Nanotechnology

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Nowadays, it is highly desirable to achieve high strength, flexibility and electrochemical performance for supercapacitor electrodes simultaneously. Herein, few-layer MXene flakes are assembled into free-standing films by facile vacuum-filtration method, in which hydrophilicfunctionalized carbon nanotubes (CNTs) are further incorporated. The morphology of MXene/ CNT composite films evolves from compact to 'CNT in MXene' to laminar to 'MXene in CNT' and finally to separate structures when increasing the CNT weight percentage. Among them, the laminar structure in which thin MXene and CNT layers are stacked alternately is demonstrated to be the best. The laminar MXene/CNT film possesses much higher strength, elongation and specific capacitance than MXene film due to the engineered porosity, good interaction between MXene flakes and CNTs, and proper CNTs' distribution. As a result, high specific capacitance of 423.4 F g −1 at 1 A g −1 and capacitance retention of nearly 60% at 10 A g −1 are accomplished. Moreover, the composite film is flexible and withstands bending up to 180°, indicating that the proposed laminar MXene/CNT composite film is a superb candidate for flexible supercapacitors.

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Section: Characterization Of Structures and Morphologiesmentioning

confidence: 74%

Enhanced tensile and electrochemical performance of MXene/CNT hierarchical film

Zhao

Liang

et al. 2021

Nanotechnology

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“…The removal of PS spheres after annealing was confirmed by SEM images of the cross-sections of MPC-5 and MPC-5-A, resulting in a porous MXene/CNT hybrid foam (Figure 5b,c). The Raman spectra of MPC-5-A in Figure S8a, Supporting Information, showed strong peaks at D and G bands belonging to CNTs [46] and good maintained peak intensity at 151 cm −1 , which is caused by the vibration of Ti and C atoms, suggesting the addition of CNT has improved the stability during annealing compared with MX6PS 310 -A. Additionally, CNTs have been proved to be a nanosized spacer [28,47] to effectively enrich the nanosized channels, which is confirmed by the Brunauer-Emmett-Teller (BET) surface area analysis and pore size distribution (Figure S8b, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Understanding the Effect of Pore Size on Electrochemical Capacitive Performance of MXene Foams

Zhang

Zhao

et al. 2022

Small

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Wearable electronics demand energy storage devices with high energy density and fast charging‐discharging rates. Although various porous electrodes have been constructed, the effect of pore size on the capacitive performance of 2D nanomaterials has been rarely studied. Herein, flexible MXene foams with significantly different pore structures are fabricated using varying diameter polystyrene (PS) spheres (80, 310, and 570 nm), which shows uniform pores and interconnected pores providing enough active sites and a good electrical connection for electron transfer. Noteworthy, when MXene flakes and templates (310 nm) have a similar size, the foam delivers the highest gravimetric capacitance of 474 ± 12 F g−1 at 2 mV s−1 than others. Additionally, the mass ratio between MXene and PS controls the packing density of foams influencing the inner resistance of foam electrodes. A carbon nanotube is introduced to further improve the electrical conductivity of foams to achieve a capacitance of 462 ± 8 F g−1 at 2 mV s−1 and retains 205 ± 10 F g−1 at 1000 mV s−1, demonstrating promises in energy storage applications and providing an insightful guidance for designing 2D nanomaterials‐based porous electrodes for supercapacitors.

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“…The peak of D and G band of the Ni-Co@NHC occurred at 1348 cm −1 and 1587 cm −1 , respectively. Their intensity ratio (I D /I G ) is equal to 0.85 indicating improved crystallinity with low defects in the Ni-Co@NHC, and it has high-graphitization degree, which accounts for its high conductivity [35].…”

Section: Resultsmentioning

confidence: 99%

ZIF-67-derived N-doped double layer carbon cage as efficient catalyst for oxygen reduction reaction

Zhang¹,

Zhao²,

Niu³

et al. 2021

Nanotechnology

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The slow kinetic of oxygen reduction reaction (ORR) hampers the practical application of energy conversion devices, such as fuel cells, metal-air batteries. Here, an efficient ORR electrocatalyst consists of Co, Ni co-decorated nitrogen-doped double shell hollow carbon cage (Ni–Co@NHC) was fabricated by pyrolyzing Ni-doped polydopamine wrapped ZIF-67. During the preparation, polydopamine served as a protective layer can effectively prevent the aggregation of Co and Ni nanoparticles during the pyrolysis process, and at the same time forming a carbon layer to grow a double layer carbon cage. This unique hollow structure endows the catalyst with a high specific surface area as well as more exposed active sites. Also benefited from the synergistic effect between Ni and Co nanoparticles, the Ni–Co@NHC catalyst leads to an outstanding ORR performance of half-wave potential (E 1/2, 0.862 V), outperforms that of commercial Pt/C catalyst. Additionally, when Ni–Co@NHC was used in the cathode for the zinc-air battery, the cell exhibits high power density (108 mW cm−2) and high specific capacity (806 mAh g−1) at 20 mA cm−2 outperforming Pt/C. This work offers a promising design strategy for the development of high-performance ORR electrocatalysts.

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A single step in-situ process for improvement in electron emission properties of surface-modified carbon nanotubes (CNTs): Titanium dioxide nanoparticles attachment

Cited by 15 publications

References 92 publications

Enhanced tensile and electrochemical performance of MXene/CNT hierarchical film

Enhanced tensile and electrochemical performance of MXene/CNT hierarchical film

Understanding the Effect of Pore Size on Electrochemical Capacitive Performance of MXene Foams

ZIF-67-derived N-doped double layer carbon cage as efficient catalyst for oxygen reduction reaction

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