Highly Active Nanostructured CoS2/CoS Heterojunction Electrocatalysts for Aqueous Polysulfide/Iodide Redox Flow Batteries

Authors

Dui Ma, Shanghai Jiao Tong University
Bo Hu, Utah State UniversityFollow
Wenda Wu, Utah State UniversityFollow
Xi Liu, Shanghai Jiao Tong University
Jiantao Zai, Shanghai Jiao Tong University
Chen Shu, Shanghai Jiao Tong University
Tsegaye Tadesse Tsega, Shanghai Jiao Tong University
Liwei Chen, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO)
Xuefeng Qian, Shanghai Jiao Tong University
T. Leo Liu, Utah State UniversityFollow

Document Type

Article

Journal/Book Title

Nature Communications

Publication Date

7-29-2019

Publisher

Nature Publishing Group

Award Number

NSF, Division of Chemistry (CHE) 1847674

Funder

NSF, Division of Chemistry (CHE)

Volume

10

First Page

1

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 License.

Last Page

8

Abstract

Aqueous polysulfide/iodide redox flow batteries are attractive for scalable energy storage due to their high energy density and low cost. However, their energy efficiency and power density are usually limited by poor electrochemical kinetics of the redox reactions of polysulfide/iodide ions on graphite electrodes, which has become the main obstacle for their practical applications. Here, CoS₂/CoS heterojunction nanoparticles with uneven charge distribution, which are synthesized in situ on graphite felt by a one-step solvothermal process, can significantly boost electrocatalytic activities of I⁻/I₃⁻ and S²⁻/S_x²⁻redox reactions by improving absorptivity of charged ions and promoting charge transfer. The polysulfide/iodide flow battery with the graphene felt-CoS₂/CoS heterojunction can deliver a high energy efficiency of 84.5% at a current density of 10 mA cm⁻², a power density of 86.2 mW cm⁻² and a stable energy efficiency retention of 96% after approximately 1000 h of continuous operation.

Recommended Citation

Ma, Dui, Hu, Bo, Liu, Xi, Zai, Jiantao, Shu, Chen, et al. "Highly Active Nanostructured CoS2/CoS Heterojunction Electrocatalysts for Aqueous Polysulfide/Iodide Redox Flow Batteries." Nature Communications, 2019, pp. 1-8. https://doi.org/10.1038/s41467-019-11176-y