Synergistic effect between the graphene electrodes and the BiFeO3-BaTiO3 composite to overcome the limit of capacitance in eco-friendly supercapacitors made with a seawater electrolyte
Por:
Ojeda, L., Oliva, J., Reyes-Montero, A., Oliva, A. I., Zamora, J., Molina, A., Encinas, A., Gonzalez-Contreras, G.
Publicada:
25 mar 2023
Ahead of Print:
1 ene 2023
Resumen:
To reduce the contamination of the water/soil by wasted polyethylene
(generated by daily products), we propose here the fabrication of
efficient and flexible supercapacitors (SCs) using recycled polyethylene
(PE) from toothpaste tubes. A graphene ink was printed on the PE to make
it conductive and the capacitive performance of the SCs was enhanced by
adding to their electrodes a BiFeO3/BaTiO3 (BF/BT) ceramic. The devices
made without the BF/BT showed a maximum capacitance and energy density
of 312.4 F g-1 and 62.4 Wh kg-1, respectively. Moreover, the devices
made with BF/BT and PVA/H3PO4 gel-electrolyte, pre-sented a capacitance
and energy density of 721.8 F g-1 and 144.6 Wh kg-1, respectively. This
last device had 130% more capacitance than that without BF/BT. In order
to make an eco-friendly SC, we substituted the PVA/H3PO4 electrolyte
with seawater and obtained a capacitance and energy density of 563.7 F
g-1 and 112.7 Wh kg-1, respectively. This last value of capacitance is
approximate to 22% lower than that for the device made with PVA/H3PO4,
but we avoid the toxicity of the acidic electrolyte for the environment.
Interestingly, the SC devices reported here maintained a voltage of
0.6-1.05 V after 10 h of steady discharge. Absorbance, XPS and Raman
techniques demonstrated the presence of oxygen vacancies, Ti4+/ Ti3+,
Bi3+/ Bi2+ and Fe3+/ Fe2+ species (redox centers) on the SC electrodes
made with BF/BT and PVA/H3PO4, but only the oxygen va-cancies and Bi3+/
Bi2+ species were found in the SC electrodes fabricated with BF/BT and
seawater. Thus, the lower performance of the devices made with seawater
is associated to the absence of certain redox centers that contributed
to the charge storage. Overall, the results of this investigation
demonstrated that efficient SCs can be fabricated from recycled plastics
and innocuous components (BF/BT and seawater) for wearable technologies,
benefiting in this way the environment.(c) 2022 Elsevier B.V. All rights
reserved.
Filiaciones:
Ojeda, L.:
CONACYT-División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica A. C, SLP, San Luis Potosí, 78216, Mexico
Inst Potosino Invest Cient & Tecnol AC, Div Mat Avanzados, CONACYT, San Luis Potosi 78216, SLP, Mexico
Oliva, J.:
CONACYT-División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica A. C, SLP, San Luis Potosí, 78216, Mexico
(Corresponding Author), Inst Potosino Invest Cient & Tecnol AC, Div Mat Avanzados, CONACYT, San Luis Potosi 78216, SLP, Mexico
Inst Potosino Invest Cient & Tecnol AC, Div Mat Avanzados, CONACYT, San Luis Potosi 78216, SLP, Mexico
Reyes-Montero, A.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Ciudad Univ, Ciudad De Mexico 04510, Mexico
Oliva, A. I.:
Cinvestav IPN, Unidad Mérida, Depto. de Física Aplicada, A.P. 73-Cordemex, Yucatán, Mérida, 97310, Mexico
Cinvestav IPN, Unidad Merida, Dept Fis Aplicada, AP 73 Cordemex, Merida 97310, Yucatan, Mexico
Zamora, J.:
Departamento de Ingeniería Metalurgia, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México, 04510, Mexico
Univ Nacl Autonoma Mexico, Fac Quim, Dept Ingn Met, Ciudad Univ, Ciudad De Mexico 04510, Mexico
Molina, A.:
CONACYT-División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica A. C, SLP, San Luis Potosí, 78216, Mexico
Inst Potosino Invest Cient & Tecnol AC, Div Mat Avanzados, CONACYT, San Luis Potosi 78216, SLP, Mexico
Encinas, A.:
CONACYT-División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica A. C, SLP, San Luis Potosí, 78216, Mexico
Inst Potosino Invest Cient & Tecnol AC, Div Mat Avanzados, CONACYT, San Luis Potosi 78216, SLP, Mexico
Gonzalez-Contreras, G.:
Cátedras CONACYT, Coordinación para la Innovación y la Aplicación de la Ciencia y la Tecnología, Universidad Autónoma de San Luis Potosí, San Luis Potosí, 78000, Mexico
Univ Autonoma San Luis Potosi, Catedras CONACYT, Coordinac Innovac & Aplicac Ciencia & Tecnol, San Luis Potosi 78000, Mexico
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