Engineered separator of cellulose/ionic-liquid for the fabrication of a novel device with H-type architecture and dual function: Supercapacitor and NO2 gas sensor
Por:
Ojeda L., Molina A., Padmasree K.P., Mtz-Enriquez A.I., Zakhidov A., Rodriguez-Gonzalez V., Oliva J.
Publicada:
1 ene 2024
Ahead of Print:
1 abr 2024
Resumen:
This investigation presents the fabrication of integrated dual-devices that work as supercapacitor or NO2 gas-sensor. Those devices were constructed with a novel H-type architecture, which allows the control of the separation distance between electrodes (d = 0.4 or 0.8 cm). Firstly, SCs were made with d = 0.8 cm and graphene (GR) electrodes (GR-SC/0.8 device), those ones produced the highest capacitance/energy–density of 284.6F/g/40.6 Wh kg-1. Next, SCs were made with composite electrodes of graphene/La0.2Gd1.8Zr2O7 + La0.7Sr0.3MnO3-perovskite (LGZM) and the weight ratio of GR/LGZM varied from 1/1 to 0.7/1.3. SCs made with GR/LGZM ratio of 1/1 and d = 0.8 cm produced a higher capacitance/energy–density of 378.3F/g/52.5 Wh kg-1. Devices made with a separation distance of 0.4 cm had lower capacitances of 56–72.7F/g, but presented a battery behavior (not observed in the devices made with d = 0.8) that generated capacities of 787–866 mAh/g. Interestingly, increasing the separation distance from 0.4 to 0.8 in the devices made with GR + LGZM increased their capacitance by 268–571 %. Raman and XPS analyses demonstrated that the redox centers for the charge storage in the SCs made with the LGZM-perovskite were the oxygen vacancies, Mn3+/Mn4+ and Gd0/Gd3+ species. Later, the dielectric separator of the GLGZM1/1-SC/0.4 device was coated by a layer of ionic liquid [BMIM][BF4] and this modified device (sensor) was exposed to NO2 gas. Consequently, NO2 gas (100 ppm) was detected with response/recovery times of 11.6/178.8 s (its gas-response was 10.3). For reference purposes, a similar sensor was made with only graphene electrodes, but it had higher response/recovery times of 17.1/284.2 s and lower gas-response of 5.9. Hence, the dual-devices could provide energy and detection of noxious gases, which is attractive for wearable electronics. © 2024 Elsevier B.V.
Filiaciones:
División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica A. C., San Luis Potosí, SLP, 78216, Mexico
Cinvestav Unidad Saltillo, Parque Industrial, Ramos Arizpe, Coahuila, 25900, Mexico
NanoTech Institute, The University of Texas at Dallas, Richardson, 75080, TX, United States
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México Boulevard Juriquilla 3001, Querétaro, 76230, Mexico
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