Volume 62, Issue 38 e202309601
Research Article

Reconstructing Hydrogen Bond Network Enables High Voltage Aqueous Zinc-Ion Supercapacitors

Zhiyu Hu

Zhiyu Hu

College of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, China

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Zirui Song

Zirui Song

College of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, China

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Zhaodong Huang

Zhaodong Huang

Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, 999077 Hong Kong, China

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Shusheng Tao

Shusheng Tao

College of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, China

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Bai Song

Bai Song

Dongying Cospowers Technology Limited Company China, Dongying, 257091 China

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Ziwei Cao

Ziwei Cao

College of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, China

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Xinyu Hu

Xinyu Hu

College of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, China

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Jiae Wu

Jiae Wu

College of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, China

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Fengrong Li

Fengrong Li

College of Materials Science and Engineering, Changsha University of Science and Technology, 410114 Changsha, China

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Prof. Wentao Deng

Prof. Wentao Deng

College of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, China

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Prof. Hongshuai Hou

Prof. Hongshuai Hou

College of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, China

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Xiaobo Ji

Xiaobo Ji

College of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, China

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Prof. Guoqiang Zou

Corresponding Author

Prof. Guoqiang Zou

College of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, China

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First published: 07 August 2023
Citations: 28

Graphical Abstract

A new aqueous hybrid high-pressure electrolyte has been developed by incorporating DMF and PEG400 as co-solvents, enabling the reconfiguration of hydrogen bonding networks in water and control over the interfacial transfer processes. This electrolyte exhibits a wider electrochemical stability window, significantly enhancing the stability and cycling lifespan of assembled zinc ion supercapacitors under high pressure.

Abstract

High-voltage aqueous rechargeable energy storage devices with safety and high specific energy are hopeful candidates for the future energy storage system. However, the electrochemical stability window of aqueous electrolytes is a great challenge. Herein, inspired by density functional theory (DFT), polyethylene glycol (PEG) can interact strongly with water molecules, effectively reconstructing the hydrogen bond network. In addition, N, N-dimethylformamide (DMF) can coordinate with Zn2+, assisting in the rapid desolvation of Zn2+ and stable plating/stripping process. Remarkably, by introducing PEG400 and DMF as co-solvents into the electrolyte, a wide electrochemical window of 4.27 V can be achieved. The shift in spectra indicate the transformation in the number and strength of hydrogen bonds, verifying the reconstruction of hydrogen bond network, which can largely inhibit the activity of water molecule, according well with the molecular dynamics simulations (MD) and online electrochemical mass spectroscopy (OEMS). Based on this electrolyte, symmetric Zn cells survived up to 5000 h at 1 mA cm−2, and high voltage aqueous zinc ion supercapacitors assembled with Zn anode and activated carbon cathode achieved 800 cycles at 0.1 A g−1. This work provides a feasible approach for constructing high-voltage alkali metal ion supercapacitors through reconstruction strategy of hydrogen bond network.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

Research data are not shared.

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