Please use this identifier to cite or link to this item: https://ir.swu.ac.th/jspui/handle/123456789/17228
ชื่อเรื่อง: Ball milling modification of perovskite LaNiO3 powders for enhancing electrochemical pseudocapacitor
ผู้แต่ง: Phumuen P.
Kumnorkaew P.
Srepusharawoot P.
Klangtakai P.
Pimanpang S.
Amornkitbamrung V.
วันที่เผยแพร่: 2021
บทคัดย่อ: 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.
URI: https://ir.swu.ac.th/jspui/handle/123456789/17228
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85108867138&doi=10.1016%2fj.surfin.2021.101282&partnerID=40&md5=040bd9cee8c8763322cca25345fd060d
ISSN: 24680230
Appears in Collections:Scopus 1983-2021

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