Anion‐cation double‐substitution endows iron sulfide with remarkably enhanced specific capacity and rate performance as anode for supercapacitors
Yiwei Yao,
Jinsong Wang,
Xiaohan Ban,
Chi Chen,
Qian Wang,
Kai Zhu,
Ke Ye,
Guiling Wang,
Dianxue Cao,
Jun Yan
Affiliations
Yiwei Yao
College of Materials Science and Chemical Engineering Harbin Engineering University Harbin China
Jinsong Wang
Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming China
Xiaohan Ban
College of Materials Science and Chemical Engineering Harbin Engineering University Harbin China
Chi Chen
Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, and Xiamen Institute of Rare Earth Materials Haixi Institute, Chinese Academy of Sciences Xiamen China
Qian Wang
College of Materials Science and Chemical Engineering Harbin Engineering University Harbin China
Kai Zhu
College of Materials Science and Chemical Engineering Harbin Engineering University Harbin China
Ke Ye
College of Materials Science and Chemical Engineering Harbin Engineering University Harbin China
Guiling Wang
College of Materials Science and Chemical Engineering Harbin Engineering University Harbin China
Dianxue Cao
College of Materials Science and Chemical Engineering Harbin Engineering University Harbin China
Jun Yan
College of Materials Science and Chemical Engineering Harbin Engineering University Harbin China
Abstract Metal sulfides have shown great potential as the anodes of the asymmetric supercapacitors ascribed to their superior theoretical specific capacitance. However, their specific capacitance and rate performances are still far from the expectation due to the intrinsic poor electronic conductivity and sluggish kinetics. Herein, we employ the anion and cation double‐substitution strategy to prepare iron sulfide nanoparticles on graphene composite (denoted as NiFeSP/G) to improve the electronic conductivity of FeS2. The NiFeSP/G composite exhibits greatly improved electrochemical performances with a high specific capacity of 765 C g−1 (765 F g−1) at 5 A g−1 and a remarkable rate capability of 65% at 100 A g−1. Moreover, an aqueous asymmetric supercapacitor is fabricated with the NiFeSP/G as anode and NiCo‐LDH/graphene as cathode presents an impressively high energy density up to 109 Wh kg−1 at 1591 W kg−1 and cycling performance (89% of the initial capacity retained after 8000 cycles).
