Publication: Ball milling modification of perovskite LaNiO3 powders for enhancing electrochemical pseudocapacitor
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Issued Date
2021
Resource Type
Language
eng
File Type
application/pdf
ISSN
24680230
Other identifier(s)
2-s2.0-85108867138
Rights Holder(s)
Scopus
Bibliographic Citation
Surfaces and Interfaces. Vol 25, No. (2021)
Suggested Citation
Phumuen P., Kumnorkaew P., Srepusharawoot P., Klangtakai P., Pimanpang S., Amornkitbamrung V. Ball milling modification of perovskite LaNiO3 powders for enhancing electrochemical pseudocapacitor. Surfaces and Interfaces. Vol 25, No. (2021). doi:10.1016/j.surfin.2021.101282 Retrieved from: https://hdl.handle.net/20.500.14740/6007
Abstract
A perovskite LaNiO3 powder was prepared via a sol–gel method. The powder has a particle size of 0.28 μm and a rhombohedral crystal structure. Electrochemical performance of the as-prepared LaNiO3 electrodes is as low as 9.94 F g−1 at the discharged current density of 5 A g−1. Ball milling treatments of the LaNiO3 powders in dry-air, ethanol and DI water reduce the particle sizes and greatly improve their specific capacitances to 27.10, 64.23 and 76.87 F g−1, respectively. X-ray diffraction detects a second phase formation of La(OH)3 in LaNiO3 ball-milled in DI water. Energy dispersive X-ray spectra and X-ray photoelectron spectroscopy results suggest that the charge process of the LaNiO3 electrode attracts OH− ions to the LaNiO3 electrode and oxidizes Ni2+ to Ni3+. In contrast, the discharge process releases OH− ions from the LaNiO3 electrode and reduces Ni3+ back to Ni2+. Electrochemical impedance spectroscopy shows that the DI-ball-milled LaNiO3 powders have lower series resistance (Rs = 0.207 Ω) and charge-transfer resistance (Rct = 0.18 Ω,) than the as-prepared LaNiO3 powders (Rs = 0.205 Ω and Rct = 0.99 Ω). © 2021 Elsevier B.V.