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Orientador(es)
Resumo(s)
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.
Descrição
Palavras-chave
Electrochemically reduced graphene oxide Nickel-cobalt oxide Energy storage Electrode degradation Electrochemical impedance spectroscopy
Contexto Educativo
Citação
ADAN-MAS, A.; [et al] – Nickel-cobalt oxide modified with reduced graphene oxide: Performance and degradation for energy storage applications. Journal of Power Sources. ISSN 0378-7753. Vol. 419 (2019), pp. 12-26
Editora
Elsevier