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Core-Shell Carbon Nanofibers@Ni(OH)(2)/NiO Composites for High-Performance Asymmetric Supercapacitors

The application of transition metal oxides/hydroxides in energy storage has long been studied by researchers. In this paper, the core-shell CNFs@Ni(OH)(2)/NiO composite electrodes were prepared by calcining carbon nanofibers (CNFs) coated with Ni(OH)(2) under an N(2) atmosphere, in which NiO was gen...

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Detalles Bibliográficos
Autores principales: Fan, Peizhi, Xu, Lan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9738488/
https://www.ncbi.nlm.nih.gov/pubmed/36499871
http://dx.doi.org/10.3390/ma15238377
Descripción
Sumario:The application of transition metal oxides/hydroxides in energy storage has long been studied by researchers. In this paper, the core-shell CNFs@Ni(OH)(2)/NiO composite electrodes were prepared by calcining carbon nanofibers (CNFs) coated with Ni(OH)(2) under an N(2) atmosphere, in which NiO was generated by the thermal decomposition of Ni(OH)(2). After low-temperature carbonization at 200 °C, 250 °C and 300 °C for 1 h, Ni(OH)(2) or/and NiO existed on the surface of CNFs to form the core-shell composite CNFs@Ni(OH)(2)/NiO-X (X = 200, 250, 300), in which CNFs@Ni(OH)(2)/NiO-250 had the optimal electrochemical properties due to the coexistence of Ni(OH)(2) and NiO. Its specific capacitance could reach 695 F g(−1) at 1 A g(−1), and it still had 74% capacitance retention and 88% coulomb efficiency after 2000 cycles at 5 A g(−1). Additionally, the asymmetric supercapacitor (ASC) assembled from CNFs@Ni(OH)(2)/NiO-250 had excellent energy storage performance with a maximum power density of 4000 W kg(−1) and a maximum functional capacity density of 16.56 Wh kg(−1).