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Research Article

Hierarchical FexBi2−xS3 solid solutions for boosted supercapacitor performance

Fengming Zhou1,§, Xiaodong Wang1,§, Ruijie Jing1,2, Xiaoyu Li1,2, Qi Zhang1, Zhenjiang Li1, Yunmei Du2, Zhenyu Xiao1(), Lei Wang1,2()
International Cooperation United Laboratory of Eco-chemical Engineering and Green Manufacturing, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
Technology Innovation Center of Battery Safety and Energy Storage Technology, Qingdao, International Science and Technology Cooperation Base of Qingdao, College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, China

§ Fengming Zhou and Xiaodong Wang contributed equally to this work.

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The synthesized porous, defect-rich FexBi2−xS3 solid solution electrodes present excellent electrochemical energy storage properties. The optimized FeBiS-60% electrode exhibits a high capacitance of 832.8 F·g−1 at a current density of 1 A·g−1.

Abstract

For the pursuit of high energy supercapacitors, the development of high performance pseudocapacitance or battery-type negative electrode material is urgently needed to make up for the capacity shortage of commercial electric double layer capacitor (EDLC) type materials. Herein, a porous and defect-rich FexBi2−xS3 solid solution structure is firstly constructed by employing Fe-doped Bi2O2CO3 porous nanosheets as a precursor, which presents dramatically increased energy storage performance than Bi2S3 and FeS2 phase. For the optimized FexBi2−xS3 solid solution (FeBiS-60%), the Fe solute is free and random dispersed in Bi2S3 framework, which can effectively modulate the electronic structure of Bi element and introduce rich-defect due to the existence of Fe(II). Meanwhile, the FeBiS-60%, constructed by pore nanosheets that are assembled by self-supported basic nanorod units, presents rich mesoporous channels for fast mass transfer and abundant active sites for promoting capacity performance. Therefore, a high capacitance of 832.8 F·g−1 at a current density of 1 A·g−1 is achieved by the FeBiS-60% electrode. Furthermore, a fabricated Ni3S2@Co3S4 (NCS)//FeBiS-60% hybrid supercapacitor device delivers an outstanding energy density of 85.33 Wh·kg−1 at the power density of 0.799 kW·kg−1, and ultra-long lifespan of remaining 86.7% initial capacitance after 8700 cycles.

Keywords

supercapacitorsolid solutionsdefect structurehierarchical structureBi2S3

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Nano Research
Volume 17 Issue 5,
May 2024
Pages 3997-4005
DOI: 10.1007/s12274-023-6243-4
Cite this article:
Zhou F, Wang X, Jing R, et al. Hierarchical FexBi2−xS3 solid solutions for boosted supercapacitor performance. Nano Research, 2024, 17(5): 3997-4005. https://doi.org/10.1007/s12274-023-6243-4
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