Adan-Mas, AlbertoMoura E Silva, TeresaGuerlou-Demourgues, LilianeBourgeois, L.MONTEMOR, FATIMA2019-05-022019-05-022019-04-15ADAN-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. 12-260378-77531873-2755http://hdl.handle.net/10400.21/9914Nickel-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.engElectrochemically reduced graphene oxideNickel-cobalt oxideEnergy storageElectrode degradationElectrochemical impedance spectroscopyjournal article10.1016/j.jpowsour.2019.02.055