Capacitive performance of vertically aligned reduced titania nanotubes coated with Mn 2 O 3 by reverse pulse electrodeposition.

Autor: Samsudin NA; Department of Chemistry, Faculty of Science, Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia zulkar@upm.edu.my +60389466775., Zainal Z; Department of Chemistry, Faculty of Science, Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia zulkar@upm.edu.my +60389466775.; Materials Synthesis and Characterization Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia., Lim HN; Department of Chemistry, Faculty of Science, Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia zulkar@upm.edu.my +60389466775.; Materials Synthesis and Characterization Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia., Sulaiman Y; Department of Chemistry, Faculty of Science, Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia zulkar@upm.edu.my +60389466775.; Functional Devices Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia., Chang SK; Department of Chemistry, Faculty of Science, Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia zulkar@upm.edu.my +60389466775.; Materials Synthesis and Characterization Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia., Lim YC; School of Chemistry and Environmental, Faculty of Applied Sciences, Universiti Teknologi MARA 40450 Shah Alam Selangor Malaysia., Ayal AK; Department of Chemistry, Faculty of Science, Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia zulkar@upm.edu.my +60389466775.; Department of Chemistry, College of Science for Women, University of Baghdad Baghdad Iraq., Mohd Amin WN; Department of Chemistry, Faculty of Science, Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia zulkar@upm.edu.my +60389466775.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2018 Jun 25; Vol. 8 (41), pp. 23040-23047. Date of Electronic Publication: 2018 Jun 25 (Print Publication: 2018).
DOI: 10.1039/c8ra03513j
Abstrakt: In this study, a composite material, manganese oxide/reduced titania nanotubes (Mn 2 O 3 /R-TNTs), was synthesized through incorporation of Mn 2 O 3 onto R-TNTs via the reverse pulse electrodeposition technique. The influence of pulse reverse duty cycles on the morphological, structural and electrochemical performance of the surface was studied by varying the applied duty cycle from 10% to 90% for 5 min total on-time at an alternate potential of -0.90 V ( E on ) and 0.00 V ( E off ). FESEM analysis revealed the uniform deposition of Mn 2 O 3 on the circumference of the nanotubes. The amount of Mn 2 O 3 loaded onto the R-TNTs increased as a higher duty cycle was applied. Cyclic voltammetry and galvanostatic charge-discharge tests were employed to elucidate the electrochemical properties of all the synthesized samples in 1 M KCl. The specific capacitance per unit area was greatly enhanced upon the incorporation of Mn 2 O 3 onto R-TNTs, but showed a decrease as a high duty cycle was applied. This proved that low amounts of Mn 2 O 3 loading enhanced the facilitation of the active ions for charge storage purposes. The optimized sample, Mn 2 O 3 /R-TNTs synthesized at 10% duty cycle, exhibited high specific capacitance of 18.32 mF cm -2 at a current density of 0.1 mA cm -2 obtained from constant current charge-discharge measurements. This revealed that the specific capacitance possessed by Mn 2 O 3 /R-TNTs synthesized at 10% duty cycle was 6 times higher than bare R-TNTs.
Competing Interests: The authors declare that there is no conflict of interest regarding the publication of this paper.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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