Highly active nanostructured CoS2/CoS heterojunction electrocatalysts for aqueous polysulfide/iodide redox flow batteries

Dui Ma, Bo Hu, Wenda Wu, Xi Liu, Jiantao Zai (), Chen Shu, Tsegaye Tadesse Tsega, Liwei Chen, Xuefeng Qian () and T. Leo Liu ()
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Dui Ma: Shanghai Jiao Tong University
Bo Hu: Utah State University
Wenda Wu: Utah State University
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: Chinese Academy of Sciences
Xuefeng Qian: Shanghai Jiao Tong University
T. Leo Liu: Utah State University

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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−/Sx2− 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.

Date: 2019
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DOI: 10.1038/s41467-019-11176-y

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