Bifunctional bamboo-like CoSe2 arrays for high-performance asymmetric supercapacitor and electrocatalytic oxygen evolution

Nanotechnology
Tian ChenGuojia Fang

Abstract

Bifunctional bamboo-like CoSe2 arrays are synthesized by thermal annealing of Co(CO3)0.5OH grown on carbon cloth in Se atmosphere. The CoSe2 arrays obtained have excellent electrical conductivity, larger electrochemical active surface areas, and can directly serve as a binder-free electrode for supercapacitors and the oxygen evolution reaction (OER). When tested as a supercapacitor electrode, the CoSe2 delivers a higher specific capacitance (544.6 F g-1 at current density of 1 mA cm-2) compared with CoO (308.2 F g-1) or Co3O4 (201.4 F g-1). In addition, the CoSe2 electrode possesses excellent cycling stability. An asymmetric supercapacitor (ASC) is also assembled based on bamboo-like CoSe2 as a positive electrode and active carbon as a negative electrode in a 3.0 M KOH aqueous electrolyte. Owing to the unique stucture and good electrochemical performance of bamboo-like CoSe2, the as-assembled ACS can achieve a maximum operating voltage window of 1.7 V, a high energy density of 20.2 Wh kg-1 at a power density of 144.1 W kg-1, and an outstanding cyclic stability. As the catalyst for the OER, the CoSe2 exhibits a lower potential of 1.55 V (versus RHE) at current density of 10 mA cm-2, a smaller Tafel slope of 62.5 mV dec-1 and an ...Continue Reading

References

Apr 18, 2015·Chemical Society Reviews·Xiaoxin Zou, Yu Zhang
Jan 27, 2016·ACS Applied Materials & Interfaces·Xiaojuan ChenRongming Wang
Apr 5, 2017·Nanotechnology·S G HuL J Deng
Sep 29, 2017·ACS Applied Materials & Interfaces·Tian ChenGuojia Fang

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Citations

Oct 8, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Iqra RabaniSupriya A Patil
Apr 16, 2020·ACS Applied Materials & Interfaces·Sung Gun KimJyongsik Jang
Nov 3, 2021·ACS Applied Materials & Interfaces·Beirong YeJinshu Wang

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