Positively Charged Quasi-Metal-Organic Framework to Reconstruct an Electric Double Layer for a Durable Zn Metal Anode.

Nano Lett

Shenzhen Key Laboratory of Micro/Nanoporous Functional Materials (SKLPM), SUSTech-Kyoto University Advanced Energy Materials Joint Innovation Laboratory (SKAEM-JIL), Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices, Department of Chemistry, and

Published: May 2025


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Article Abstract

To reveal the construction principle of an electric double layer (EDL) on a Zn anode, a positively charged artificial solid electrolyte interphase (SEI) is established by a quasi-metal-organic framework with open metal sites (OMSs). As illustrated by theoretical calculation and in situ Raman and Fourier transform infrared spectroscopy characterization, the OMSs are introduced successfully and unsaturated Ce sites bond with SO anions as transfer sites for Zn, leading to a homogeneous ion distribution within the inner Helmholtz plane (IHP). Therefore, the distribution of Zn-HO-SO in the EDL has been adjusted due to the regulating effect by a SEI. Besides, the regulated EDL reduces the concentration of SO and free HO in the IHP, thus promoting uniform Zn deposition and anticorrosion properties of the Zn anode. As a result, the Q-Ce-808@Zn anode demonstrates exceptional cycling stability over 4200 h (1 mA cm) and 1300 h (20 mA cm).

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http://dx.doi.org/10.1021/acs.nanolett.5c01124DOI Listing

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