Volume 60, Issue 52 pp. 27119-27125
Research Article

Dual-Ion Intercalation and High Volumetric Capacitance in a Two-Dimensional Non-Porous Coordination Polymer

Dr. Harish Banda

Dr. Harish Banda

Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139 USA

These authors contributed equally to this work.

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Dr. Jin-Hu Dou

Dr. Jin-Hu Dou

Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139 USA

These authors contributed equally to this work.

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Tianyang Chen

Tianyang Chen

Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139 USA

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Dr. Yugang Zhang

Dr. Yugang Zhang

Center for Functional Nanomaterials, Brookhaven National Laboratories, 735 Brookhaven Avenue, Upton, NY, 11973 USA

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Prof. Mircea Dincă

Corresponding Author

Prof. Mircea Dincă

Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139 USA

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First published: 01 October 2021
Citations: 26

Graphical Abstract

A two-dimensional coordination polymer (Ni3BHT) demonstrates rapid and reversible intercalation of both cations and anions in an electrochemical capacitor (EC). This first observation of dual-ion intercalation in ECs presents a unique scenario, wherein cation intercalation in Ni3BHT is pseudocapacitive but anion intercalation is capacitive in nature.

Abstract

Intercalation is a promising ion-sorption mechanism for enhancing the energy density of electrochemical capacitors (ECs) because it offers enhanced access to the electrochemical surface area. It requires a rapid transport of ions in and out of a host material, and it must occur without phase transformations. Materials that fulfil these requirements are rare; those that do intercalate almost exclusively cations. Herein, we show that Ni3(benzenehexathiol) (Ni3BHT), a non-porous two-dimensional (2D) layered coordination polymer (CP), intercalates both cations and anions with a variety of charges. Whereas cation intercalation is pseudocapacitive, anions intercalate in a purely capacitive fashion. The excellent EC performance of Ni3BHT provides a general basis for investigating similar dual-ion intercalation mechanisms in the large family of non-porous 2D CPs.

Conflict of interest

The authors declare no conflict of interest.

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