resumo
Thanks to the advanced technologies for energy generation such as solar cells and thermo- or piezo-generators the amount of electricity transformed from light, heat or mechanical pressure sources can be significantly enhanced. However, there is still a demand for effective storage devices to conserve electrical energy which addresses the wide range of large stationary applications from electric vehicles to small portable devices. Among the large variety of energy-storage systems available today, electrochemical energy sources and, in particular, supercapacitors (SC), are rather promising in terms of cost, scaling, power management, life cycle and safety. Therefore, this review surveys recent achievements in the development of SC based on composites of such carbon-derived materials as graphene (G) and reduced graphene oxide (rGO) with carbon nanotubes (CNT). Various factors influencing the specific capacitance are discussed, while specific energy and power as well as cycling stability of SC with G/rGO-CNT composite electrode materials are overviewed.
palavras-chave
ENERGY-STORAGE; SUPERCAPACITIVE PERFORMANCE; ELECTROCHEMICAL CAPACITANCE; DOUBLE-LAYER; AEROGEL; NETWORKS; FILM; NANOCOMPOSITES; CONDUCTIVITY; NANOSHEETS
categoria
Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied
autores
Okhay, O; Tkach, A
nossos autores
Oleksandr Tkach
Investigador Auxiliar
Olena Okhay
Bolseiro de pós-Doutoramentoagradecimentos
This article is supported by national funds, through FCT-Fundacao para a Ciencia e a Tecnologia, in the scope of the framework contract foreseen in the numbers 4, 5 and 6 of the article 23 of the Decree-Law 57/2016, of 29 AuSgust, and UID/EMS/00481/2019, UIDB/50011/2020, UIDP/50011/2020 and by Centro 2020, through the European Regional Development Fund (ERDF), in the scope of the project CENTRO-01-0145-FEDER-022083.