Abstract
This study focuses on the influence of an applied external magnetic field on the electrodeposition process and capacitive performances of MnO2, as pseudo-capacitive active material for supercapacitors electrodes. MnO2 was electrochemically deposited on Si/Au substrates in the presence and in the absence of a 0.5 T magnet, and its capacitive performance was tested via electrochemical characterization. The samples obtained in the presence of the magnetic field show a positive influence on the deposition process: the increase in deposition efficiency leads to more compact and uniform MnO2 coatings, with a decrease in capacitance values for the samples produced with the magnetic field.
Highlights
Supercapacitors exhibit middle characteristics between batteries and conventional capacitors in terms of power vs energy density, placing themselves in between the two previous solutions
Results obtained by Pang S.C. [10] lead to the same direction, highlighting a greater capacitive performance of MnO2 thin-films electrodes after prolonged voltammetric cycling
With the microstructure being a focal point of interest, in the context of electrochemical methods, an established way to affect the plating microstructure is the application of an external magnetic field
Summary
Supercapacitors exhibit middle characteristics between batteries and conventional capacitors in terms of power vs energy density, placing themselves in between the two previous solutions. Their specific energy is lower than batteries, but considerable power spikes can be obtained for shorter times (a few seconds), making them an ideal profile as load-leveling systems. In the category of pseudocapacitors (a variety of supercapacitors), the charge–discharge mechanism is intermediate between the two considered main systems, it is still not completely defined. Manganese oxide (MnO2 ) has been reported to exhibit high specific capacitance, allowing to realize systems which range from 130 to 700 F/g in mild aqueous electrolytes [10]. Toupin M. summarized the two main proposed solutions [9]: the first assesses the intercalation of H + protons or alkali metal Cations C + (such as Li+ ) in the bulk of the material
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
