BROWSE

Related Researcher

Author's Photo

Kim, Guntae
gunslab
Research Interests
  • Solid Oxide Fuel Cells (SOFCs)& SOE, PEMFC, metal-air batteries, Metal-CO2 system, Catalyst for DRM

ITEM VIEW & DOWNLOAD

Enhancing Bifunctional Electrocatalytic Activities via Metal d-Band Center Lift Induced by Oxygen Vacancy on the Subsurface of Perovskites

DC Field Value Language
dc.contributor.author Lee, Hansol ko
dc.contributor.author Gwon, Ohhun ko
dc.contributor.author Choi, Keunsu ko
dc.contributor.author Zhang, Linjuan ko
dc.contributor.author Zhou, Jing ko
dc.contributor.author Park, Jungmin ko
dc.contributor.author Yoo, Jung-Woo ko
dc.contributor.author Wang, Jian-Qiang ko
dc.contributor.author Lee, Jun Hee ko
dc.contributor.author Kim, Guntae ko
dc.date.available 2020-07-29T07:50:08Z -
dc.date.created 2020-07-23 ko
dc.date.issued 2020-04 ko
dc.identifier.citation ACS CATALYSIS, v.10, no.8, pp.4664 - 4670 ko
dc.identifier.issn 2155-5435 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/47267 -
dc.description.abstract For efficient electrochemical catalysts, several molecular-scale descriptors have been proposed for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Various descriptors of perovskite catalysts have been proposed successfully for understanding either ORR or OER, but previous studies are insufficient to explain and thus boost up both ORR and OER simultaneously due to obstacles such as many different chemical compositions, structures, and metal orbital bands. Therefore, we investigate ORR/OER activities as a function of only oxygen vacancy concentration in perovskite oxides of Sm0.5Sr0.5CoO3-delta (SSC) to check the close relationship between delta (delta) and the electronic structure. Interestingly, the improved performance of both ORR and OER is explained by the change in the oxidation state of the transition metal caused by the increase in oxygen vacancies. Unfortunately, most previous research studies have focused on the effect of only oxygen vacancy (delta) on responsiveness. To confirm this, we performed density functional theory (DFT) analysis to find the more dominant factor on whether the activity descriptor is either delta or oxidation states of transition metals. The DFT analysis reveals that the ORR and OER activities of SSC are simultaneously improved by the reduced gap between d- and p-band centers (Delta Ed-p) caused by the raised d-band center (M-d). X-ray absorption spectroscopy has provided the exact electronic states of all the transition metals. Here, we report that an important factor of ORR/OER is affected only by the oxidation state of the transition metal in the perovskite oxide, not by the oxygen vacancy concentration. ko
dc.language 영어 ko
dc.publisher AMER CHEMICAL SOC ko
dc.title Enhancing Bifunctional Electrocatalytic Activities via Metal d-Band Center Lift Induced by Oxygen Vacancy on the Subsurface of Perovskites ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85085645394 ko
dc.identifier.wosid 000543700400019 ko
dc.type.rims ART ko
dc.identifier.doi 10.1021/acscatal.0c01104 ko
dc.identifier.url https://pubs.acs.org/doi/10.1021/acscatal.0c01104 ko
Appears in Collections:
MSE_Journal Papers
ECHE_Journal Papers

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show simple item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU