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Self-assembled nanostructured CuCo2 O4 for electrochemical energy storage and the oxygen evolution reaction via morphology engineering

Aqueel Ahmed, Abu Talha, Hou, Bo, Chavan, Harish S., Jo, Yongcheol, Cho, Sangeun, Kim, Jongmin, Pawar, Sambhaji M., Cha, SeungNam, Inamdar, Akbar I., Kim, Hyungsang and Im, Hyunsik 2018. Self-assembled nanostructured CuCo2 O4 for electrochemical energy storage and the oxygen evolution reaction via morphology engineering. Small 14 (28) , -. 10.1002/smll.201800742

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Abstract

CuCo2O4 films with different morphologies of either mesoporous nanosheets, cubic, compact‐granular, or agglomerated embossing structures are fabricated via a hydrothermal growth technique using various solvents, and their bifunctional activities, electrochemical energy storage and oxygen evolution reaction (OER) for water splitting catalysis in strong alkaline KOH media, are investigated. It is observed that the solvents play an important role in setting the surface morphology and size of the crystallites by controlling nucleation and growth rate. An optimized mesoporous CuCo2O4 nanosheet electrode shows a high specific capacitance of 1658 F g−1 at 1 A g−1 with excellent restoring capability of ≈99% at 2 A g−1 and superior energy density of 132.64 Wh kg−1 at a power density of 0.72 kW kg−1. The CuCo2O4 electrode also exhibits excellent endurance performance with capacity retention of 90% and coulombic efficiency of ≈99% after 5000 charge/discharge cycles. The best OER activity is obtained from the CuCo2O4 nanosheet sample with the lowest overpotential of ≈290 mV at 20 mA cm−2 and a Tafel slope of 117 mV dec−1. The superior bifunctional electrochemical activity of the mesoporous CuCo2O4 nanosheet is a result of electrochemically favorable 2D morphology, which leads to the formation of a very large electrochemically active surface area.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Wiley
ISSN: 1613-6810
Date of First Compliant Deposit: 25 February 2020
Last Modified: 10 Mar 2020 18:08
URI: http://orca.cf.ac.uk/id/eprint/129516

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