Electrochemical Intercalation of MoO3-MoS2 Composite Electrodes: Charge Storage Mechanism of Non-hydrated CationsCitation formats

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Electrochemical Intercalation of MoO3-MoS2 Composite Electrodes: Charge Storage Mechanism of Non-hydrated Cations. / Dryfe, Robert; Iamprasertkun, Pawin; Bissett, Mark; Hirunpinyopas, Wisit; Tripathi, A.

In: Electrochimica Acta, 2019.

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Dryfe, Robert ; Iamprasertkun, Pawin ; Bissett, Mark ; Hirunpinyopas, Wisit ; Tripathi, A. / Electrochemical Intercalation of MoO3-MoS2 Composite Electrodes: Charge Storage Mechanism of Non-hydrated Cations. In: Electrochimica Acta. 2019.

Bibtex

@article{e4ca812d054c4037ab132e3c9d3539cd,
title = "Electrochemical Intercalation of MoO3-MoS2 Composite Electrodes: Charge Storage Mechanism of Non-hydrated Cations",
abstract = "MoS2 and MoO3 have attracted attention due to their interesting properties in energy storage applications, however, the operative charge storage mechanism, whether based on surface ion adsorption and intercalation, is not yet fully understood. In this work, the intercalation of non-hydrated cations into free-standing MoO3-MoS2 electrodes, prepared as composites with graphene, was studied. The oxide material is formed during the solution phase exfoliation process. It is found that tetramethylammonium chloride (TMACl) provides twice the capacitance of tetraethylammonium chloride (TEACl) and tetrapropylammonium chloride (TPACl) solutions. This is attributed to the interlayer spacing of MoS2 (0.615 nm) and MoO3 (0.690 nm), which are greater than the crystallographic diameter of TMA+ (0.558 nm). In contrast, the crystallographic diameter of TEA+ (0.674 nm) and TPA+ (0.758 nm), being larger than the interlayer spacing of MoS2, leads to storage of charge only on the surface of the materials through ion adsorption. Moreover, we have found that use of the TPA+ ion leads to the partial re-exfoliation of the as-prepared materials, which can enhance the capacitance retention during cycling. These results improve the understanding of charge storage mechanism of layered 2D materials.",
keywords = "2D materials, Liquid phase exfoliation, Intercalation, Tetraalkylammonium chloride, Supercapacitors",
author = "Robert Dryfe and Pawin Iamprasertkun and Mark Bissett and Wisit Hirunpinyopas and A. Tripathi",
year = "2019",
doi = "10.1016/j.electacta.2019.03.141",
language = "English",
journal = "Electrochim Acta",
issn = "0013-4686",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - Electrochemical Intercalation of MoO3-MoS2 Composite Electrodes: Charge Storage Mechanism of Non-hydrated Cations

AU - Dryfe, Robert

AU - Iamprasertkun, Pawin

AU - Bissett, Mark

AU - Hirunpinyopas, Wisit

AU - Tripathi, A.

PY - 2019

Y1 - 2019

N2 - MoS2 and MoO3 have attracted attention due to their interesting properties in energy storage applications, however, the operative charge storage mechanism, whether based on surface ion adsorption and intercalation, is not yet fully understood. In this work, the intercalation of non-hydrated cations into free-standing MoO3-MoS2 electrodes, prepared as composites with graphene, was studied. The oxide material is formed during the solution phase exfoliation process. It is found that tetramethylammonium chloride (TMACl) provides twice the capacitance of tetraethylammonium chloride (TEACl) and tetrapropylammonium chloride (TPACl) solutions. This is attributed to the interlayer spacing of MoS2 (0.615 nm) and MoO3 (0.690 nm), which are greater than the crystallographic diameter of TMA+ (0.558 nm). In contrast, the crystallographic diameter of TEA+ (0.674 nm) and TPA+ (0.758 nm), being larger than the interlayer spacing of MoS2, leads to storage of charge only on the surface of the materials through ion adsorption. Moreover, we have found that use of the TPA+ ion leads to the partial re-exfoliation of the as-prepared materials, which can enhance the capacitance retention during cycling. These results improve the understanding of charge storage mechanism of layered 2D materials.

AB - MoS2 and MoO3 have attracted attention due to their interesting properties in energy storage applications, however, the operative charge storage mechanism, whether based on surface ion adsorption and intercalation, is not yet fully understood. In this work, the intercalation of non-hydrated cations into free-standing MoO3-MoS2 electrodes, prepared as composites with graphene, was studied. The oxide material is formed during the solution phase exfoliation process. It is found that tetramethylammonium chloride (TMACl) provides twice the capacitance of tetraethylammonium chloride (TEACl) and tetrapropylammonium chloride (TPACl) solutions. This is attributed to the interlayer spacing of MoS2 (0.615 nm) and MoO3 (0.690 nm), which are greater than the crystallographic diameter of TMA+ (0.558 nm). In contrast, the crystallographic diameter of TEA+ (0.674 nm) and TPA+ (0.758 nm), being larger than the interlayer spacing of MoS2, leads to storage of charge only on the surface of the materials through ion adsorption. Moreover, we have found that use of the TPA+ ion leads to the partial re-exfoliation of the as-prepared materials, which can enhance the capacitance retention during cycling. These results improve the understanding of charge storage mechanism of layered 2D materials.

KW - 2D materials

KW - Liquid phase exfoliation

KW - Intercalation

KW - Tetraalkylammonium chloride

KW - Supercapacitors

U2 - 10.1016/j.electacta.2019.03.141

DO - 10.1016/j.electacta.2019.03.141

M3 - Article

JO - Electrochim Acta

JF - Electrochim Acta

SN - 0013-4686

ER -