High-performance iron ion hybrid supercapacitor based on CoMoS3/polyaniline electrodes

Xia Sun; Liying Wang; Yang Gao; Xuesong Li; Xijia Yang; Wei Lü

doi:10.1016/j.jcis.2026.139881

High-performance iron ion hybrid supercapacitor based on CoMoS₃/polyaniline electrodes

J Colloid Interface Sci. 2026 May:709:139881. doi: 10.1016/j.jcis.2026.139881. Epub 2026 Jan 13.

Authors

Xia Sun¹, Liying Wang¹, Yang Gao¹, Xuesong Li¹, Xijia Yang², Wei Lü³

Affiliations

¹ Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science & College of Material Science and Engineering, Changchun University of Technology, Changchun 130012, China.
² Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science & College of Material Science and Engineering, Changchun University of Technology, Changchun 130012, China. Electronic address: yangxijia@ccut.edu.cn.
³ Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science & College of Material Science and Engineering, Changchun University of Technology, Changchun 130012, China; State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China. Electronic address: lvwei@ccut.edu.cn.

PMID: 41548472
DOI: 10.1016/j.jcis.2026.139881

Abstract

Energy storage devices fulfill an indispensable and critical role in balancing the supply and demand of energy, reducing the consumption of fossil fuels, and mitigating environmental pollution. In this work, an iron-ion hybrid supercapacitor (IIHS) is developed，which employs a nano-honeycomb structured CoMoS3-PANI composite as the cathode. CoMoS₃ improves the redox active sites for its electrochemical reactions, which helps to prevent the self-stacking of ion transfer channels. The introduction of PANI creates a pillar-supported hierarchical structure for CoMoS₃ growth, which enhances Fe²⁺ ion transport kinetics and cycling stability. Benefiting from this advanced electrode architecture, the assembled alternating current (AC)-based supercapacitor delivers a high areal capacitance of 3065.2 mF cm^-2 at a current density of 1 mA cm^-2 (voltage window: 0-1.2 V). Furthermore, the device exhibits outstanding long-term cycling stability, maintaining 88.19% of its initial capacitance after 10,000 galvanostatic charge-discharge cycles. Meanwhile, we fabricated poly (vinyl alcohol) / carboxymethyl cellulose Fe²⁺ gel electrolyte, and the flexible device maintained 84.28% capacity after 3000 cycles. This cost-effective, long-lasting, and safe iron ion hybrid capacitor holds significant promise for future applications in the energy storage sector.

Keywords: Application; Density functional theory; High performance; Ternary transition metal sulfide; iron ion hybrid supercapacitor.