Hydrothermal synthesis and characterization of CNT@MoS2 nanotubes

Song, Xu Chun; Zheng, Yanbing; Zhao, Yang; Yin, Hao

doi:10.1016/j.matlet.2006.01.002

Cited by 42 publications

(21 citation statements)

References 15 publications

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“…A closer view on CNTs demonstrates well maintained structure with a lattice spacing of 0.34 nm corresponding to its (002) plane, which can be observed in the selected area electron diffraction (SAED) pattern (Inset of Figure 3a, highlighted by arc). Noticeably, unlike the previous reports [17,20,[22][23][24]36,37], there is no observable evidence showing MoS 2 growth on CNTs surface in our examinations, which is possibly due to their extremely low concentration and negatively charged surface ( Figure S5), which is unfavorable for MoO 4 2 À anions attaching. However, the detailed mechanisms still need to be further clarified in future work.…”

Section: Resultscontrasting

confidence: 99%

A three-dimensionally interconnected carbon nanotube/layered MoS2 nanohybrid network for lithium ion battery anode with superior rate capacity and long-cycle-life

et al. 2015

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Section: Resultscontrasting

confidence: 99%

A three-dimensionally interconnected carbon nanotube/layered MoS2 nanohybrid network for lithium ion battery anode with superior rate capacity and long-cycle-life

et al. 2015

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“…In this regard, hybrid structures of TMD sheets (e.g., MoS 2 sheets) and conductive carbon materials (e.g., modified graphene heterostructures) have been investigated as advanced electrocatalysts for ORR . However, the nonintimate interactions between TMD and the carbon materials restrict the stability and cause homogeneity issues for electrochemical ORR . In addition, the hybrid structure of TMD materials and carbon materials for bifunctional electrocatalysts toward both ORR and OER has yet to be investigated.…”

Section: Introductionmentioning

confidence: 70%

Bifunctional Oxygen Electrocatalysis through Chemical Bonding of Transition Metal Chalcogenides on Conductive Carbons

Tiwari

Kim

et al. 2017

Advanced Energy Materials

108

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performance and commercialization of fuel cells and metal-air batteries. [9,10] Furthermore, searching for bifunctional electrocatalysts for both ORR and OER is critically important for the development of electrochemical devices, especially for rechargeable metal-air batteries. Platinum (Pt) and Pt-based materials are the most efficient ORR catalysts, while ruthenium oxide (RuO 2 ) and iridium oxide (IrO 2 ) are considered as the best electrocatalysts for OER. [11,12] However, the use of these noble metal materials is limited because of their high cost and scarcity. To make matters worse, the efficiency of Pt or RuO 2 / IrO 2 for ORR and OER simultaneously is very poor; this is the case because Pt is only active for ORR (but inactive for OER) while RuO 2 /IrO 2 is only active for OER (but inactive for ORR). [13] Therefore, extensive research efforts have been taken to develop non-noble metal and efficient bifunctional electrocatalysts toward both ORR and OER.In this respect, many kinds of bifunctional electrocatalysts have been investigated, such as alloys of Pt and Ir/Ru catalysts, toward ORR and OER. [14][15][16] However, the high cost of noble metals limits their large-scale applications in electrochemical energy devices. However, earth-abundant conductive carbon materials and their derivatives, such as graphene and carbon nanotubes (CNTs), can replace noble metal alloys for practical applications in electrochemical energy devices. Recently, heteroatom B-and N-doped carbon materials showed the possibility of simultaneous OER and ORR activity. [17][18][19][20][21][22][23][24][25][26][27] However, obtaining OER activity on heteroatom-doped carbon materials is still challenging because of the low catalytic activity of water splitting; additionally, although the ORR activity can match commercial Pt/C catalysts, it suffers from poor stability. [28,29] In order to address this challenge, composites of transition metals, including cobalt oxide/cobalt sulphide and carbon materials, have been proposed to actively catalyze OER with low overpotentials. [30][31][32] Moreover, a metal-doped transition metal oxide on graphene has also been shown to be a good electrocatalyst toward OER. [33][34][35][36] However, developing carbon-based electrocatalysts toward ORR and OER is still challenging due to the instability of transition metals and the nonintimate contact between the conductive carbonaceous materials and the doping/decorated active material. [37] Improving the electrochemical performance of both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) has been of great interest in emerging renewable energy technologies. This study reports an advanced bifunctional hybrid electrocatalyst for both ORR and OER, which is composed of tungsten disulphide (WS 2 ) and carbon nanotube (CNT) connected via tungsten carbide (WC) bonding. WS 2 sheets on the surface of CNTs provide catalytic active sites for electrocatalytic activity while the CNTs act as conduction channels and provide a large surface area. Moreover,...

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“…It has been reported CNTs favored the growth of the tubular MoS 2 on the surface of carbon nanotube side walls and promoted the formation of tubular MoS 2 layers with high crystallinity272829, CNTs/MoS 2 composites have also been prepared by the simple solvothermal method3031. For example, tubular MoS 2 layers coating on CNTs were synthesized by the hydrothermal reaction between Na 2 MoO 4 and CS(NH 2 ) 2 with the presence of CNTs12.…”

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confidence: 99%

Self-assembly of hierarchical MoSx/CNT nanocomposites (2<x<3): towards high performance anode materials for lithium ion batteries

Shi

Wang

Wong

et al. 2013

Sci Rep

299

167

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Two dimension (2D) layered molybdenum disulfide (MoS2) has emerged as a promising candidate for the anode material in lithium ion batteries (LIBs). Herein, 2D MoSx (2 ≤ x ≤ 3) nanosheet-coated 1D multiwall carbon nanotubes (MWNTs) nanocomposites with hierarchical architecture were synthesized via a high-throughput solvent thermal method under low temperature at 200°C. The unique hierarchical nanostructures with MWNTs backbone and nanosheets of MoSx have significantly promoted the electrode performance in LIBs. Every single MoSx nanosheet interconnect to MWNTs centers with maximized exposed electrochemical active sites, which significantly enhance ion diffusion efficiency and accommodate volume expansion during the electrochemical reaction. A remarkably high specific capacity (i.e., > 1000 mAh/g) was achieved at the current density of 50 mA g−1, which is much higher than theoretical numbers for either MWNTs or MoS2 along (~372 and ~670 mAh/g, respectively). We anticipate 2D nanosheets/1D MWNTs nanocomposites will be promising materials in new generation practical LIBs.

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Hydrothermal synthesis and characterization of CNT@MoS2 nanotubes

Cited by 42 publications

References 15 publications

A three-dimensionally interconnected carbon nanotube/layered MoS2 nanohybrid network for lithium ion battery anode with superior rate capacity and long-cycle-life

A three-dimensionally interconnected carbon nanotube/layered MoS2 nanohybrid network for lithium ion battery anode with superior rate capacity and long-cycle-life

Bifunctional Oxygen Electrocatalysis through Chemical Bonding of Transition Metal Chalcogenides on Conductive Carbons

Self-assembly of hierarchical MoSx/CNT nanocomposites (2<x<3): towards high performance anode materials for lithium ion batteries

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