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Aqueous Zinc Ion Storage in MoS2 by Tuning the Intercalation Energy.

08:00 EDT 15th April 2019 | BioPortfolio

Summary of "Aqueous Zinc Ion Storage in MoS2 by Tuning the Intercalation Energy."

Aqueous Zn-ion batteries present a low cost, safe, and high-energy battery technology, but suffer from the lack of suitable cathode materials because of the sluggish intercalation kinetics associated with the large size of hydrated zinc ions. Herein we report an effective and general strategy to transform inactive intercalation hosts into efficient Zn2+ storage materials through intercaltion energy tuning. Using MoS2 as a model system, we show both experimentally and theoretically that even hosts with originally poor Zn2+ diffusivity can allow fast Zn2+ diffusion. Through simple interlayer spacing and hydrophilicity engineering that can be experimentally achieved by oxygen incorporation, the Zn2+ diffusivity is boosted by 3 orders of magnitude, effectively enabling the otherwise barely active MoS2 to achieve a high capacity of 232 mAh g-1 that is 10 times as its pristine form. The strategy developed in our work can be generally applied for enhancing the ion storage capacity of metal chalcogenides and other layered materials, making them promising cathodes for challenging multivalent ion batteries.

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This article was published in the following journal.

Name: Nano letters
ISSN: 1530-6992
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