ADÁN-MÁS, Alberto; SILVA, Maria Teresa; GUERLOU-DEMOURGUES, Liliane; BOURGEOIS, Lydie; LABRUGERE-SARROSTE, Chritine; MONTEMOR, Maria De Fátima

doi:10.1016/j.jpowsour.2019.02.055

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ADÁN-MÁS, Alberto
Centro de Quimica Estrutural [CQE]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

SILVA, Maria Teresa
ADEM, GI-MOSM, ISEL-Instituto Superior de Engenharia de Lisboa
Centro de Quimica Estrutural [CQE]

GUERLOU-DEMOURGUES, Liliane
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Réseau sur le stockage électrochimique de l'énergie [RS2E]

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Journal of Power Sources. 2019-04, vol. 419, p. 12-26

Elsevier

Résumé en anglais

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.< Réduire

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Electrochemically reduced graphene oxide

Nickel-cobalt oxide

Energy storage

Electrode degradation

Electrochemical impedance spectroscopy

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

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