This is an excellent poster. Can you explain me more about the experimental section AAO+Perovskite? Also, what is the meaning of the specific capacity of 0.4 and 0.07 F g−1 showed in the GCD analysis? Thank you in advance.
Anonymous said…
Excelente. Sin duda un ajustado resumen de un gran volumen de trabajo experimental.
This is a very complete poster with the successful synthesis of one alumina embedded perovskite and even the presence of the Co(III)/Co(II) hemicuples could be determined. Certainly, an interesting work.
For alumina-embedded SrCo0.95V0.05O3 perovskite synthesis, AAO membranes with a pore diameter of ~50 nm were used. The membrane was placed inside the vacuum equipment specially designed for this purpose and wetted by the precursor solution (stoichiometric mixture of Sr(NO3)2; Co(NO3)2• 6H2O and NH4VO3). Once this stage was finalized, the membrane was washed carefully with ultrapure water and separated from the aluminum with a scalpel. Thereafter, the filled membrane was subjected to a stepped thermal treatment (300 °C for 2 h, 600 °C for 6 h and 900 °C for 12 h). Later, the template was partially dissolved by introducing it in a 4.0 M NaOH aqueous solution for 168 h, then 4 h under ultrasound, rinsed with ultrapure water and finally heated up to 1100 °C for 24 h.
On the other hand, capacitance corresponds to charge accumulation capacity. Therefore, the charge accumulation capacity of the carbon compound containing nanostructured perovskite (0.4 Fg-1) is higher than massive perovskite (0.07 Fg-1). It is worth noting that only ~ 2% of nanoperovskite was employed. That means, graphite composite containing nanostructured perovskite is a promising material for the development of more efficient supercapacitor devices.
If you need more specific details, contact me at: m.salguero@unc.edu.ar
To Cecilia: Indeed! The CV response shows the presence of pair of anodic and cathodic peaks around 0.35 V, not present in the carbon only paste, which are assigned to the Co(III)/Co(II) redox couple in the perovskite. This response can be attributed mainly to the faradaic redox reaction of the cobalt centers, which determine the supercapacitor behavior of the electrodes. Additionally, it can be noted that the peak density currents are higher than for the paste electrode containing nanostructured perovskite in comparison to the bulk one, which can be correlate to its higher active surface area.
Best regards, Marcelo
Jessica Gutiérrez said…
Un póster muy claro e interesante. Me gusto mucho las gráficas de la metodología, no es mi tema y me resultó más fácil entenderlo. Gracias,
Comments
To anonymous (August 18, 2020 at 7:59 AM):
For alumina-embedded SrCo0.95V0.05O3 perovskite synthesis, AAO membranes with a pore diameter of ~50 nm were used. The membrane was placed inside the vacuum equipment specially designed for this purpose and wetted by the precursor solution (stoichiometric mixture of Sr(NO3)2; Co(NO3)2• 6H2O and NH4VO3). Once this stage was finalized, the membrane was washed carefully with ultrapure water and separated from the aluminum with a scalpel. Thereafter, the filled membrane was subjected to a stepped thermal treatment (300 °C for 2 h, 600 °C for 6 h and 900 °C for 12 h). Later, the template was partially dissolved by introducing it in a 4.0 M NaOH aqueous solution for 168 h, then 4 h under ultrasound, rinsed with ultrapure water and finally heated up to 1100 °C for 24 h.
On the other hand, capacitance corresponds to charge accumulation capacity. Therefore, the charge accumulation capacity of the carbon compound containing nanostructured perovskite (0.4 Fg-1) is higher than massive perovskite (0.07 Fg-1). It is worth noting that only ~ 2% of nanoperovskite was employed. That means, graphite composite containing nanostructured perovskite is a promising material for the development of more efficient supercapacitor devices.
If you need more specific details, contact me at: m.salguero@unc.edu.ar
Best regards,
Marcelo
Indeed! The CV response shows the presence of pair of anodic and cathodic peaks around 0.35 V, not present in the carbon only paste, which are assigned to the Co(III)/Co(II) redox couple in the perovskite. This response can be attributed mainly to the faradaic redox reaction of the cobalt centers, which determine the supercapacitor behavior of the electrodes. Additionally, it can be noted that the peak density currents are higher than for the paste electrode containing nanostructured perovskite in comparison to the bulk one, which can be correlate to its higher active surface area.
Best regards,
Marcelo
Gracias,
Gracias a ti Jessica, muy positivo tu comentario.
Saludos cordiales
Marcelo