Pre‐Intercalation of Zn Ions to Enlarge and Stabilize Hierarchical Structure of ZnxMn1‐xSe Cathode for Flexible Zn‐Ion Capacitor

Author:

Fang Cuiqin1,Xu Bingang1ORCID,Han Jing1,Liu Xinlong1,Gao Yuanyuan1,Huang Junxian1

Affiliation:

1. Nanotechnology Center School of Fashion and Textiles The Hong Kong Polytechnic University Kowloon 999077 Hong Kong

Abstract

AbstractZn‐ion capacitors (ZICs) assembled from cathodes with diffusion‐controlled behaviors and capacitive anodes have attracted increasing interest thanks to their satisfactory and balanced energy and power densities. However, currently, only two cathode materials of this type, MnO2 and V2O5, are applied to ZICs. MnSe is increasingly being reported to exhibit diffusion‐controlled characteristics in metal‐ion batteries and supercapacitors, yet its insufficient interlayer spacing and unstable structure lead to poor energy storage capacity. Herein, ZnxMn1‐xSe microflowers with nanosheets can be in situ pre‐intercalated with Zn ions to enlarge and stabilize the interlayer spacing of hierarchical porous structure, demonstrating to be a superior cathode for ZICs. During the charging/discharging process of Zn0.14Mn0.86Se electrode, a redox couple at ≈0.6/0.3 V on cyclic voltammetry profile, and a potential plateau appearing at ≈0.2 V on discharge curve is detected, corresponding to the insertion/extraction of Zn ions. Thus, a long discharge time realizes on the discharge curve of flexible ZIC assembled from polyacrylamide gel electrolyte and activated carbon anode, achieving a superb areal capacitance of 2,038.2 mF cm−2 at 1 mA cm−2. This work offers an exemplary effort to unlock fresh cathodes for ZICs.

Funder

Hong Kong Polytechnic University

Publisher

Wiley

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