Oxygen incorporated in 1T/2H hybrid MoS2 nanoflowers prepared from molybdenum blue solution for asymmetric supercapacitor applications

Lee, Sang‐Hyun; Hwang, Jeonguk; Kim, Daham; Ahn, Hye Shin

doi:10.1016/j.cej.2021.129701

Cited by 61 publications

(33 citation statements)

References 78 publications

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“…Furthermore, the 1T MoS 2 crystal possesses many more electroactive sites originating from the incompletely filled 4d orbitals of the Mo atom. These merits enable 1T phase MoS 2 to be highly desirable for electrochemical energy storage and hydrogen reaction production. − Over the past several years, lots of researchers have demonstrated that the phase structure of MoS 2 plays a critical role in determining the supercapacitor and HER activity. − Nevertheless, the thermodynamically metastable nature and issue of the absence of large-scale synthesis of 1T phase MoS 2 are the main challenges to be solved for its wide application as an electrode material. − The overall performance of either 2H or 1T MoS 2 is still far from being satisfactory for use as as a practical active material in the field of electrochemistry. Recently, studies have found that by constructing 1T/2H hybrid phase MoS 2 , the amount of electrochemical activity could be improved efficiently while maintaining the stability .…”

Section: Introductionmentioning

confidence: 99%

Controllably Doping Nitrogen into 1T/2H MoS₂ Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N₂ Plasma

Zhang

Zhao

et al. 2021

ACS Appl. Mater. Interfaces

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Molybdenum disulfide (MoS 2 ) is a promising candidate for use as a supercapacitor electrode material and non-noble-metal electrocatalyst owing to its relatively high theoretical specific capacitance, Pt-like electronic feature, and graphene-like structure. However, insufficient electrochemically active sites along with poor conductivity significantly hinder its practical application. Heteroatom doping and phase engineering have been regarded as effective ways to overcome the inherent limitations of MoS 2 and enhance its ion storage and electrocatalytic performance. In this study, a plasma-assisted nitrogen-doped 1T/2H MoS 2 heterostructure has been proposed for the first time, resulting in excellent supercapacitor performance and hydrogen evolution reaction activity. XPS, Raman, and TEM analysis results indicate that N atoms have been successfully doped into MoS 2 nanosheets via roomtemperature low-power N 2 plasma, and the 1T/2H hybrid phase is maintained. As expected, the 1T/2H MoS 2 heterostructure after a 10 min plasma treatment displayed a much boosted supercapacitive performance with a high specific capacitance of 410 F g −1 at 1 A g −1 and an excellent hydrogen evolution property with a low overpotential of 131 mV vs RHE at 10 mA cm −2 for hydrogen evolution reaction. The excellent performance is superior to most of the recently reported outstanding MoS 2 -based electrode and electrocatalytic materials. Moreover, the as-assembled flexible symmetric supercapacitor shows a high specific capacitance of 84.8 F g −1 and superior mechanical robustness with 84.5% capacity retention after 2000 bending cycles.

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Section: Introductionmentioning

confidence: 99%

Controllably Doping Nitrogen into 1T/2H MoS₂ Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N₂ Plasma

Zhang

Zhao

et al. 2021

ACS Appl. Mater. Interfaces

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“…[46] Herein, the polarization states were further investigated according to the semiconductors characteristic via electrochemical detection. Indeed, the redox charge transfer reaction in MoS 2 solid solution was naturally attributed to the adsorption and desorption of Na + , while an electron would enter the MoS 2 layer and combine with the hole, [47] finally leading to the polarization response on various point and face sites. Above all, it can be observed in I-V characteristics in Figure 4a-c that all the solid solutions transformed into typical p-type semiconductors after whatever Cu or PDA treatment, indicating that the charge migration was primarily attributed to the holes (Figure 4e,f).…”

Section: Construction Of Polarization Models For Effective Emw Absorp...mentioning

confidence: 99%

Synergistic Polarization Loss of MoS₂‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption

Gao

Lan

et al. 2022

Adv Funct Materials

129

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Given tunable hybridization structures in solid solutions, fascinating electromagnetic (EM) properties can be achieved for regulating EM wave (EMW) absorption. Herein, a novel metal–organic cooperative interactions method is proposed to manipulate the vacancy, interstitial, substitutional, and heterointerface structures in molybdenum disulfide (MoS2) solid solution simultaneously, thence meeting the synergistic polarization loss on various point and face sites. Assisted by the coordination between Cu2+ and polydopamine (PDA), the effect of Cu modification on MoS2 is highly improved, which further lead to polarization loss on S vacancy, interstitial Cu, substitutional N, and heterointerface between carbon and MoS2. Contributing to the synergetic effect among multiple polarizations, the Cu/C@MoS2 solid solution exhibit ultrahigh EMW absorption performance, of which EMA with twice PDA delivers the effective absorption bandwidth of 7.12 GHz and minimum reflection loss of −48.22 dB (2.5 mm). The energy attenuation of Cu/C@MoS2 improved almost 266.7% and 222.2% than C@MoS2 and Cu@MoS2, respectively. Finally, this work reveals the structural dependency of solid solution materials of EMW absorption and establishes an entirely new polarization loss model.

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“…The peaks at 9.03°and 18.0°correspond to the characteristic (002) and second-order (004) diffraction peaks of metallic MoS 2 , respectively. 35,36 Meanwhile, the weak diffraction of the (101) and (110) plane imply low crystallinity of metallic MoS 2 . These results confirmed that metallic MoS 2 has been successfully loaded on the wood sponge.…”

Section: Structural Characterization Of Mos 2 -Wood Spongementioning

confidence: 99%

An upcycled wood sponge adsorbent for drinking water purification by solar steam generation

Shi

et al. 2022

Environ. Sci.: Nano

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Oxygen incorporated in 1T/2H hybrid MoS2 nanoflowers prepared from molybdenum blue solution for asymmetric supercapacitor applications

Cited by 61 publications

References 78 publications

Controllably Doping Nitrogen into 1T/2H MoS₂ Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N₂ Plasma

Controllably Doping Nitrogen into 1T/2H MoS₂ Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N₂ Plasma

Synergistic Polarization Loss of MoS₂‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption

An upcycled wood sponge adsorbent for drinking water purification by solar steam generation

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Oxygen incorporated in 1T/2H hybrid MoS2 nanoflowers prepared from molybdenum blue solution for asymmetric supercapacitor applications

Cited by 61 publications

References 78 publications

Controllably Doping Nitrogen into 1T/2H MoS2 Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N2 Plasma

Controllably Doping Nitrogen into 1T/2H MoS2 Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N2 Plasma

Synergistic Polarization Loss of MoS2‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption

An upcycled wood sponge adsorbent for drinking water purification by solar steam generation

Contact Info

Product

Resources

About

Controllably Doping Nitrogen into 1T/2H MoS₂ Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N₂ Plasma

Controllably Doping Nitrogen into 1T/2H MoS₂ Heterostructure Nanosheets for Enhanced Supercapacitive and Electrocatalytic Performance by Low-Power N₂ Plasma

Synergistic Polarization Loss of MoS₂‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption