dc.contributor.author |
Matseke, Mphoma S
|
|
dc.contributor.author |
Zheng, Haitao
|
|
dc.contributor.author |
Wang, Y
|
|
dc.date.accessioned |
2021-04-05T20:02:54Z |
|
dc.date.available |
2021-04-05T20:02:54Z |
|
dc.date.issued |
2020-06 |
|
dc.identifier.citation |
Matseke, M.S., Zheng, H. & Wang, Y. 2020. The ultrasonication boosts the surface properties of CoFe2O4/C nanoparticles towards ORR in alkaline media. <i>Applied Surface Science, 516.</i> http://hdl.handle.net/10204/11935 |
en_ZA |
dc.identifier.issn |
1873-5584 |
|
dc.identifier.issn |
0169-4332 |
|
dc.identifier.uri |
http://hdl.handle.net/10204/11935
|
|
dc.description.abstract |
Since ultrasonication was reported to be used for exfoliation of layered materials in water (Science-ref. 31), the method has never been explored in non-layered materials, in particular, the effect of ultrasonication on the surface property of materials. In this work, CoFe2O4/C nanoparticles were synthesized and processed using ultrasonic treatment in water. Through the ultrasonic treatment, the electrocatalytic activity of the CoFe2O4/C nanoparticles towards ORR was improved significantly with a higher mass activity (5.05 mA mg−1) than the original CoFe2O4/C (2.75 mA mg−1) in O2-saturated 0.1 M KOH solution. The half-wave potential on the original CoFe2O4/C was also shifted to the positive side by 60 mV. Furthermore, the treated CoFe2O4/C catalyst exhibits a constant half-wave potential with better onset potential after 2000 cycles, and a 50 mV of half-wave potential on the original catalyst was moved to negative under same test condition. The analysis from characterizations reveals that the enhanced ORR performance of the treated CoFe2O4/C resulted from the Co2+ and Fe3+ enriched surface with more cations being occupied in the tetrahedral sites than the octahedral sites after ultrasonic treatment. In addition, compared to the original CoFe2O4/C catalyst, the specific surface area of the treated CoFe2O4/C was improved 1.8 times, mesoporous grown to microspores with 2.2 times increased volumes, which has provided higher active sites and accelerated transport between O2 and electrolyte during the ORR process. The ORR via the 4-electron transfer pathway on the treated CoFe2O4/C catalyst, while the 2-electron transfer process is favoured on the original CoFe2O4/C catalyst. This further signifies that the ultrasonic process had significantly influence on the electrochemical properties of the CoFe2O4/C catalyst. |
en_US |
dc.format |
Abstract |
en_US |
dc.language.iso |
en |
en_US |
dc.relation.uri |
https://doi.org/10.1016/j.apsusc.2020.146105 |
en_US |
dc.relation.uri |
https://www.sciencedirect.com/science/article/pii/S0169433220308618 |
en_US |
dc.source |
Applied Surface Science, 516 |
en_US |
dc.subject |
Alkaline media |
en_US |
dc.subject |
CoFe2O4 |
en_US |
dc.subject |
Oxygen reduction reaction |
en_US |
dc.subject |
Ultrasonication |
en_US |
dc.title |
The ultrasonication boosts the surface properties of CoFe2O4/C nanoparticles towards ORR in alkaline media |
en_US |
dc.type |
Article |
en_US |
dc.description.pages |
8pp |
en_US |
dc.description.note |
© 2020 Elsevier B.V. All rights reserved. Due to copyright restrictions, the attached PDF file contains the abstract of the full-text item. For access to the full-text item, please consult the publisher's website: https://www.sciencedirect.com/science/article/abs/pii/S0169433220308618 |
en_US |
dc.description.cluster |
Smart Places |
en_US |
dc.description.impactarea |
24 Energy Materials |
en_US |
dc.description.impactarea |
Electro Chemicals Energy Tech |
|
dc.identifier.apacitation |
Matseke, M. S., Zheng, H., & Wang, Y. (2020). The ultrasonication boosts the surface properties of CoFe2O4/C nanoparticles towards ORR in alkaline media. <i>Applied Surface Science, 516</i>, http://hdl.handle.net/10204/11935 |
en_ZA |
dc.identifier.chicagocitation |
Matseke, Mphoma S, Haitao Zheng, and Y Wang "The ultrasonication boosts the surface properties of CoFe2O4/C nanoparticles towards ORR in alkaline media." <i>Applied Surface Science, 516</i> (2020) http://hdl.handle.net/10204/11935 |
en_ZA |
dc.identifier.vancouvercitation |
Matseke MS, Zheng H, Wang Y. The ultrasonication boosts the surface properties of CoFe2O4/C nanoparticles towards ORR in alkaline media. Applied Surface Science, 516. 2020; http://hdl.handle.net/10204/11935. |
en_ZA |
dc.identifier.ris |
TY - Article
AU - Matseke, Mphoma S
AU - Zheng, Haitao
AU - Wang, Y
AB - Since ultrasonication was reported to be used for exfoliation of layered materials in water (Science-ref. 31), the method has never been explored in non-layered materials, in particular, the effect of ultrasonication on the surface property of materials. In this work, CoFe2O4/C nanoparticles were synthesized and processed using ultrasonic treatment in water. Through the ultrasonic treatment, the electrocatalytic activity of the CoFe2O4/C nanoparticles towards ORR was improved significantly with a higher mass activity (5.05 mA mg−1) than the original CoFe2O4/C (2.75 mA mg−1) in O2-saturated 0.1 M KOH solution. The half-wave potential on the original CoFe2O4/C was also shifted to the positive side by 60 mV. Furthermore, the treated CoFe2O4/C catalyst exhibits a constant half-wave potential with better onset potential after 2000 cycles, and a 50 mV of half-wave potential on the original catalyst was moved to negative under same test condition. The analysis from characterizations reveals that the enhanced ORR performance of the treated CoFe2O4/C resulted from the Co2+ and Fe3+ enriched surface with more cations being occupied in the tetrahedral sites than the octahedral sites after ultrasonic treatment. In addition, compared to the original CoFe2O4/C catalyst, the specific surface area of the treated CoFe2O4/C was improved 1.8 times, mesoporous grown to microspores with 2.2 times increased volumes, which has provided higher active sites and accelerated transport between O2 and electrolyte during the ORR process. The ORR via the 4-electron transfer pathway on the treated CoFe2O4/C catalyst, while the 2-electron transfer process is favoured on the original CoFe2O4/C catalyst. This further signifies that the ultrasonic process had significantly influence on the electrochemical properties of the CoFe2O4/C catalyst.
DA - 2020-06
DB - ResearchSpace
DP - CSIR
J1 - Applied Surface Science, 516
KW - Alkaline media
KW - CoFe2O4
KW - Oxygen reduction reaction
KW - Ultrasonication
LK - https://researchspace.csir.co.za
PY - 2020
SM - 1873-5584
SM - 0169-4332
T1 - The ultrasonication boosts the surface properties of CoFe2O4/C nanoparticles towards ORR in alkaline media
TI - The ultrasonication boosts the surface properties of CoFe2O4/C nanoparticles towards ORR in alkaline media
UR - http://hdl.handle.net/10204/11935
ER - |
en_ZA |
dc.identifier.worklist |
24066 |
en_US |