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Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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Influence of Surface Charges/Chemistry on the Catalysis of Perovskite Complexes

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Title
Influence of Surface Charges/Chemistry on the Catalysis of Perovskite Complexes
Author
Park, SeungkyuNam, GyutaeLee, Jang-SooCho, JaephilJung, Jae-Il
Keywords
ball-milling;  oxygen evolution reaction;  oxygen reduction reaction;  perovskites;  surface charge
Issue Date
201808
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.10, no.34, pp.28502 - 28508
Abstract
The electrochemical performance of the perovskite complex was discovered to depend greatly on the different locations of the identical particle, which represent different surface charges accordingly. The surface charges were evaluated by Zeta potential (zeta) for the intrinsic BSCF5582 (Ba0.5Sr0.5Co0.8Fe0.2O3-delta), ball-milled (BM-BSCF5582), and heat-treated in an oxygen atmosphere after ball-milling (48h-O-2-BM-BSCF5582), the mean zeta of which represents -11.1, 21.2, and -6.1 mV, respectively, which reflects well on different surface chemistries. When the bonding structures at the different stratified layers and the overall crystalline morphologies were analyzed via X-ray photoelectron spectroscopy and high resolution transmission electron microscopy, respectively, the crystalline- and bonding-structure at the 50 nm depth of BSCF5582 is nearly identical to that of BM-BSCF5582 at the surface. As ball-milling proceeds, not only are particles comminuted but also the amorphous surface is broken open, leading to the revelation of inner and naive cubic crystalline phase surfaces and affecting the catalytic activities of oxygen evolution reactions and oxygen reduction reactions positively and negatively, respectively, at significant scales.
URI
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DOI
http://dx.doi.org/10.1021/acsami.8b04442
ISSN
1944-8244
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