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Nickel-cobalt oxide modified with reduced graphene oxide: Performance and degradation for energy storage applications

Abstract : Nickel-cobalt oxide is synthesized in combination with electrochemically reduced graphene oxide (Er-GO) by one-step electrodeposition on stainless steel followed by thermal treatment. The presence of reduced graphene oxide leads to enhanced electrochemical response, with a capacity increase from 113 mA h g−1 to 180 mA h g−1, and to increased faradaic efficiency and rate capability. Compared to Ni-Co oxide, the addition of reduced graphene oxide increases capacity retention from 58% to 83% after 5000 cycles. The material fade during cycling is studied by means of electrochemical impedance spectroscopy, electron diffraction spectroscopy and scanning electron microscopy. As a result, different degradation mechanisms are identified as source of the capacity decay, such as microstructural cracking, phase transformation and parasitic reactions.
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Submitted on : Friday, October 22, 2021 - 10:49:11 AM
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Alberto Adán-Más, Maria Teresa Silva, Liliane Guerlou-Demourgues, Lydie Bourgeois, Chritine Labrugere-Sarroste, et al.. Nickel-cobalt oxide modified with reduced graphene oxide: Performance and degradation for energy storage applications. Journal of Power Sources, Elsevier, 2019, 419, pp.12-26. ⟨10.1016/j.jpowsour.2019.02.055⟩. ⟨hal-02095664⟩

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