Tuning parallel manganese dioxide to hollow parallel hydroxyl oxidize iron replicas for high-performance asymmetric supercapacitors

Tian Wang; Kailin Li; Qiujian Le; Shijin Zhu; Xiaolong Guo; Debin Jiang; Yuxin Zhang

doi:10.1016/j.jcis.2021.03.075

Tuning parallel manganese dioxide to hollow parallel hydroxyl oxidize iron replicas for high-performance asymmetric supercapacitors

J Colloid Interface Sci. 2021 Jul 15:594:812-823. doi: 10.1016/j.jcis.2021.03.075. Epub 2021 Mar 20.

Authors

Tian Wang¹, Kailin Li², Qiujian Le³, Shijin Zhu⁴, Xiaolong Guo⁵, Debin Jiang⁶, Yuxin Zhang⁷

Affiliations

¹ State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China; Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore.
² State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China.
³ State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China; Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore.
⁴ State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China; Institut für Chemie, Technische Universität Chemnitz, Straße der Nationen 62, 09111 Chemnitz, Germany.
⁵ College Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, PR China.
⁶ College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, PR China.
⁷ State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China. Electronic address: zhangyuxin@cqu.edu.cn.

PMID: 33794403
DOI: 10.1016/j.jcis.2021.03.075

Abstract

A novel and facile strategy is developed to tune parallel manganese dioxide (MnO₂) to hollow parallel hydroxyl oxidize iron (FeOOH) replicas, which can exactly keep its original morphology. The key factors leading to the morphology-preserved transformation are the low-temperature and dropwise strategy via a serial of controlled experiments. Benefiting from the characteristics of parallel and hollow structures, the FeOOH replica delivers remarkable specific capacitance of 186.8F g^-1 at 0.5 A g^-1. The electrochemical performances delivered by the asymmetric supercapacitor (parallel MnO₂//hollow parallel FeOOH) are much superior to those where conventional activated graphene or FeOOH nanoneedles are used as negative electrode materials. This can be attributed to the advantages of parallel nanostructure and high electrochemical matching effect of positive and negative electrode materials. The energy density is recorded up to 46.8 Wh kg^-1 at the power density of 0.5 kW kg^-1, while it still remains 20.7 Wh kg^-1 with the maximum power density of 10 kW kg^-1. Furthermore, this strategy shows great universality and can be broadened to almost all MnO₂ related researches to synthesize ideal negative electrode materials with high structural and electrochemical matching effect, thus further enhances the electrochemical performances of as-prepared asymmetric supercapacitor devices.

Keywords: FeOOH; Hollow parallel nanostructure; Morphology-preserved transformation; Supercapacitor.