In:
PLOS ONE, Public Library of Science (PLoS), Vol. 17, No. 6 ( 2022-6-2), p. e0269086-
Abstract:
Four types of flowerlike manganese dioxide in nano scale was synthesized via a liquid phase method in KMnO 4 -H 2 SO 4 solution and Cu particles, wherein the effect of Cu particles was investigated in detail. The obtained manganese dioxide powder was characterized by XRD, SEM and TEM, and the supercapacity properties of MnO 2 electrode materials were measured. The results showed that doping carbon black can benefit to better dispersion of copper particles, resulting in generated smaller size of Cu particles, and the morphology of MnO 2 nanoparticles was dominated by that of Cu particles. The study of MnO 2 synthesis by different sources of Cu particles showed that the size of MnO 2 particles decreased significantly with freshly prepared fine copper powder compared with using commercial Cu powder, and the size of MnO 2 particles can be further reduced to 120 nm by prepared Cu particles with smaller size. Therefore, it was suggested that the copper particles served as not only the reductant and but also the nuclei centre for the growth of MnO 2 particles in synthesis process MnO 2 , and that is the reason how copper particles worked on the growth of flower-like MnO 2 and electrochemical property. In the part of investigation for electrochemical property, the calculated results of b values indicated that the electrode materials have pseudo capacitance property, and the highest specific capacitance of 197.2 F g -1 at 2 mV s -1 and 148 F/g at 1 A/g were obtained for MCE electrode materials (MnO 2 was synthesized with freshly prepared copper particles, where carbon black was used and dispersed in ethanol before preparation of Cu particles). The values of charge transfer resistance in all types of MnO 2 materials electrodes were smaller than 0.08 Ω. The cycling retention of MCE material electrode is still kept as 93.8% after 1000 cycles.
Type of Medium:
Online Resource
ISSN:
1932-6203
DOI:
10.1371/journal.pone.0269086
DOI:
10.1371/journal.pone.0269086.g001
DOI:
10.1371/journal.pone.0269086.g002
DOI:
10.1371/journal.pone.0269086.g003
DOI:
10.1371/journal.pone.0269086.g004
DOI:
10.1371/journal.pone.0269086.g005
DOI:
10.1371/journal.pone.0269086.g006
DOI:
10.1371/journal.pone.0269086.g007
DOI:
10.1371/journal.pone.0269086.g008
DOI:
10.1371/journal.pone.0269086.t001
DOI:
10.1371/journal.pone.0269086.t002
DOI:
10.1371/journal.pone.0269086.s001
Language:
English
Publisher:
Public Library of Science (PLoS)
Publication Date:
2022
detail.hit.zdb_id:
2267670-3
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