Volume 9, Issue 4 2401254
Research Article

A Dual Effect Additive Modified Electrolyte Strategy to Improve the Electrochemical Performance of Zinc-Based Prussian Blue Analogs Energy Storage Device

Qing Xiong

Qing Xiong

College of Bioresources Chemical & Materials Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 China

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Chuanyin Xiong

Corresponding Author

Chuanyin Xiong

College of Bioresources Chemical & Materials Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 China

E-mail: [email protected]; [email protected]

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Qiusheng Zhou

Qiusheng Zhou

College of Bioresources Chemical & Materials Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 China

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Mengxia Shen

Mengxia Shen

College of Bioresources Chemical & Materials Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 China

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Jiangnan Song

Jiangnan Song

College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 China

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Mengjie Zhao

Mengjie Zhao

College of Bioresources Chemical & Materials Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 China

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Yongkang Zhang

Yongkang Zhang

College of Bioresources Chemical & Materials Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 China

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Meng An

Corresponding Author

Meng An

College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 China

E-mail: [email protected]; [email protected]

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Yonghao Ni

Yonghao Ni

Department of Chemical and biomedical Engineering, The University of Maine, Orono, Maine, 04469 USA

University of New Brunswick, Limerick Pulp & Paper Ctr, Fredericton, NB, E3B 5A3 Canada

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First published: 02 November 2024
Citations: 4

Abstract

Prussian blue analogs (PBA) exhibit excellent potential for energy storage due to their unique three-dimensional open framework and abundant redox active sites. However, the dissolution of transition metal ions in water can compromise the structural integrity of PBAs, leading to significant issues such as low cycle life and capacity decay. To address these challenges, we proposed a dual-effect additive-modified electrolyte method to alleviate such issues, introducing sodium ferrocyanide (Na4Fe(CN)6) into aqueous alkaline electrolytes. It could not only capture Zn2+ dissolved on the surface of Na1.86Zn1.46[Fe(CN)6]0.87 (ZnHCF) electrode material during the cycling process but also conduct redox reactions on the electrode surface to provide additional capacitance. Through experiments and molecular simulation calculations, it showed that Na4Fe(CN)6 can restrict the movement of Zn dissolution into the electrolyte on the electrode surface. Based on this, an asymmetric supercapacitor based on ZnHCF//activated carbon was assembled with a modified electrolyte. The assembled supercapacitor displayed a specific capacitance of 1,329.65 mF cm−2, a power density of 2,900 mW cm−2, and an energy density of 388.28 mW h cm−2. This study provides a new idea for the design and construction of stable and efficient PBA energy storage materials by inhibiting the leaching of transition metals in PBA.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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