Optimizing Hybridization of 1T and 2H Phases in MoS<sub>2</sub>Monolayers to Improve Capacitances of Supercapacitors

Lan, Jiang; Zhang, Shengli; Kulinich, Sergei A.; Song, Xiufeng; Zhu, Junwu; Wang, Xin; Zeng, Haibo

doi:10.1080/21663831.2015.1057654

Cited by 161 publications

(86 citation statements)

References 34 publications

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“…Metallic 1T‐phase and semiconducting 2H‐phase coexist in exf ‐MoS 2 with the ratio of 2:3 obtained from the X‐ray photoelectron spectroscopy as reported in our previous work . The 40 % 1T phase is above the percolation threshold to form an electronic conductive pathway to significantly enhance the electronic conductivity compared to that of com ‐MoS 2 . It is well known that com ‐MoS 2 also undergoes phase transition from 2H to 1T during the first discharge step .…”

Section: Methodssupporting

confidence: 77%

Intercalation Pseudocapacitance of Exfoliated Molybdenum Disulfide for Ultrafast Energy Storage

Yoo

Liang

et al. 2016

ChemNanoMat

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We report intercalation pseudocapacitance of 250 F g−1 for exfoliated molybdenum disulfide (MoS2) in non‐aqueous electrolytes that contain lithium ions. The exfoliated MoS2 shows surface‐limited reaction kinetics with high rate capability up to 3 min of charge or discharge. The intercalation pseudocapacitance originates from the extremely fast kinetics due to the enhanced ionic and electronic transport enabled by the slightly expanded layer structure as well as the metallic 1T‐phase. The exfoliated MoS2 could be also used in a Li‐Mg‐ion hybrid capacitor, which shows full cell specific capacitance of 240 F g−1.

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Section: Methodssupporting

confidence: 77%

Intercalation Pseudocapacitance of Exfoliated Molybdenum Disulfide for Ultrafast Energy Storage

Yoo

Liang

et al. 2016

ChemNanoMat

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“…Nevertheless, the growing trend of the phase boundary is clearly demonstrated by STEM studies as shown in Figure . When the annealing temperature is increased to 200 °C, the amount of phase boundaries gradually decreases due to the predominant formation of 2H phase, which is consistent with Eda et al Our conclusion of a higher charge transfer efficiency at the heterophase boundary toward better energy storage is also consistent with a recent work that found that the resistance of the 2H–1T nanohybrid MoS 2 can be lowered by optimizing the in‐plane 2H–1T phase hybridization state …”

Section: Resultsmentioning

confidence: 99%

Strong Charge Transfer at 2H–1T Phase Boundary of MoS₂ for Superb High‐Performance Energy Storage

Qin

Zhang

Zang

et al. 2019

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Transition metal dichalcogenides exhibit several different phases (e.g., semiconducting 2H, metallic 1T, 1T′) arising from the collective and sluggish atomic displacements rooted in the charge‐lattice interaction. The coexistence of multiphase in a single sheet enables ubiquitous heterophase and inhomogeneous charge distribution. Herein, by combining the first‐principles calculations and experimental investigations, a strong charge transfer ability at the heterophase boundary of molybdenum disulfide (MoS2) assembled together with graphene is reported. By modulating the phase composition in MoS2, the performance of the nanohybrid for energy storage can be modulated, whereby remarkable gravimetric and volumetric capacitances of 272 F g−1 and 685 F cm−3 are demonstrated. As a proof of concept for energy application, a flexible solid‐state asymmetric supercapacitor is constructed with the MoS2‐graphene heterolayers, which shows superb energy and power densities (46.3 mWh cm−3 and 3.013 W cm−3, respectively). The present work demonstrates a new pathway for efficient charge flow and application in energy storage by engineering the phase boundary and interface in 2D materials of transition metal dichalcogenides.

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“…It is therefore of great significance to achieve a universal synthesis method, which increases the conductivity and the number of active sites on the surface of CoP simultaneously. In principle, the use of mixed phase materials should show advantages;, it has been widely reported that mixed phase MoS 2 (1T/2H mixed crystal phase) and TiO 2 (anatase and rutile mixed crystal phase) materials exhibited greater electrocatalytic and photocatalytic activity in contrast to pure phases, which is attributed to the enhanced electron mobility across the interface of the two typical phases. Inspired by these findings, it is reasonable to speculate that the combination of different CoP phases should be an effective pathway for promoting electron transfer from an electrode, in order to increase the electrocatalytic performance ultimately …”

Section: Introductionmentioning

confidence: 99%

Polycrystalline CoP/CoP₂ Structures for Efficient Full Water Splitting

Zhang

et al. 2017

ChemElectroChem

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Transition-metal phosphides (TMPs) have attracted extensive attention for use in the field of full water splitting. Various methods have been investigated to obtain high catalytic activity, but in these synthetic processes other active materials are inevitably introduced to modify or load onto the surface of the TMP to further improve the catalytic performance. Herein, we describe a novel approach for preparing CoP/CoP 2 structures (650 8C) by pyrolysis of a complex formed from Co ions crosslinked with phytic acid (PA) using 2-methylimidazole (MeIM). The integration of CoP 2 and CoP in the structures can enhance the intrinsic electrical conductivity, and facilitate electron transfer from solution to the electrode. Overpotentials of only 250 and 239 mV were required to support the current densities of 10 and 20 mA cm À2 for the oxygen evolution reaction and hydrogen evolution reaction, respectively, demonstrating the potential of the novel material for practical overall water splitting.[a] S.

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Optimizing Hybridization of 1T and 2H Phases in MoS₂Monolayers to Improve Capacitances of Supercapacitors

Cited by 161 publications

References 34 publications

Intercalation Pseudocapacitance of Exfoliated Molybdenum Disulfide for Ultrafast Energy Storage

Intercalation Pseudocapacitance of Exfoliated Molybdenum Disulfide for Ultrafast Energy Storage

Strong Charge Transfer at 2H–1T Phase Boundary of MoS₂ for Superb High‐Performance Energy Storage

Polycrystalline CoP/CoP₂ Structures for Efficient Full Water Splitting

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Optimizing Hybridization of 1T and 2H Phases in MoS2Monolayers to Improve Capacitances of Supercapacitors

Cited by 161 publications

References 34 publications

Intercalation Pseudocapacitance of Exfoliated Molybdenum Disulfide for Ultrafast Energy Storage

Intercalation Pseudocapacitance of Exfoliated Molybdenum Disulfide for Ultrafast Energy Storage

Strong Charge Transfer at 2H–1T Phase Boundary of MoS2 for Superb High‐Performance Energy Storage

Polycrystalline CoP/CoP2 Structures for Efficient Full Water Splitting

Contact Info

Product

Resources

About

Optimizing Hybridization of 1T and 2H Phases in MoS₂Monolayers to Improve Capacitances of Supercapacitors

Strong Charge Transfer at 2H–1T Phase Boundary of MoS₂ for Superb High‐Performance Energy Storage

Polycrystalline CoP/CoP₂ Structures for Efficient Full Water Splitting