Affiliation:
1. Instituto Potosino de Investigación Científica y Tecnológica A. C. 78216 San Luis Potosí SLP México
2. Cinvestav Unidad Saltillo, Parque Industrial Ramos Arizpe Coahuila 25900 México
3. Instituto Tecnologico de Leon Av. Tecnológico s/n, Industrial Julián de Obregón 37290 León Gto. México
4. Centro de Física Aplicada y Tecnología Avanzada Universidad Nacional Autónoma de México Boulevard Juriquilla 3001 76230 – Querétaro México
Abstract
AbstractGraphene electrodes were firstly printed on recycled single‐use‐packets. Later, the Ni50Mn35In15 (NMI) alloy or Ca2.9Nd0.1Co3.9Cu0.1O9, (CNCCO) misfit perovskite was deposited on the graphene electrodes to enhance their capacitive performance. Next, flexible supercapacitors (SCs) were assembled by using such electrodes. The SCs made with NMI and CNCCO powders were named as GNMI‐SC, and GCNCCO‐SC, respectively. Those ones produced capacitances/energy‐densities of 761.8 F g−1/152.6 Wh kg−1 and 207.7 F g−1/41.6 Wh kg−1, respectively. Subsequently, a mixture 1 : 1 of NMI and CNCCO powders was melted/coalesced at 1700 °C by using a plasma treatment in argon atmosphere and obtained in this way a NMI/CNCCO composite powder. The SC made with this last composite generated a capacitance/energy‐density of 1235.2 F g−1/247.3 Wh kg−1. Those last values are 62–500 % higher than these for the GNMI‐SC, and GCNCCO‐SC devices. Other benefits obtained after the introduction of the NMI/CNCCO powders into the SCs were: 1) the formation of additional Cu2+, Mn4+, Nd2+ and In3+ species, which enhanced the capacitance; 2) the capacitance retention was maintained above 93 % after 500 cycles of charge discharge; and 3) the lowest values of series and charge transfer resistances were obtained, which favored the ion diffusion/storage in the SC electrodes.
Funder
Fundación Marcos Moshinsky
Universidad Nacional Autónoma de México