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

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Synergistic interaction of perovskite oxides and N-doped graphene in versatile electrocatalyst

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dc.contributor.author Bu, Yunfei ko
dc.contributor.author Jang, Haeseong ko
dc.contributor.author Gwon, Ohhun ko
dc.contributor.author Kim, Su Hwan ko
dc.contributor.author Joo, Se Hun ko
dc.contributor.author Nam, Gyutae ko
dc.contributor.author Kim, Seona ko
dc.contributor.author Qin, Yong ko
dc.contributor.author Zhong, Qin ko
dc.contributor.author Kwak, Sang Kyu ko
dc.contributor.author Cho, Jaephil ko
dc.contributor.author Kim, Guntae ko
dc.date.available 2019-01-03T11:48:58Z -
dc.date.created 2018-12-26 ko
dc.date.issued 2019-02 ko
dc.identifier.citation JOURNAL OF MATERIALS CHEMISTRY A, v.7, no.5, pp.2048 - 2054 ko
dc.identifier.issn 2050-7488 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/25575 -
dc.description.abstract Multifunctional electrocatalysts with high catalytic activity and durability are needed for environmentally clean energy technologies such as water-splitting devices and metal-air batteries. Herein, we investigate a new catalyst, P-3G, consisting of a cation-ordered perovskite (PrBa0.5Sr0.5)0.95Co1.5Fe0.5O5+δ (PBSCF) and 3D porous N-doped graphene (3DNG). This new type of composite electrocatalyst simultaneously exhibited outstanding multifunctional catalytic activities and excellent stabilities for the oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER). A possible mechanism for the synergistic effects between perovskite oxides and 3DNG on ORR, OER and HER was firstly proposed by DFT calculations. The electrocatalytic activity of P-3G appeared to have great potential for a rechargeable Zn-air battery system. The operating voltage differences between the charge and discharge (Δη) of P-3G and Pt/C-IrO2 after 110 cycles were 0.63 V and 0.87 V, respectively, indicating the substantial durability of P-3G. Moreover, a water-splitting device using P-3G efficiently produced H2 and O2 gases at rates of 0.859 μL s−1 and 0.417 μL s−1, respectively. This study highlights extended applications of coupled perovskite oxides/carbon materials as versatile electrocatalysts for ORR, OER, and HER and unveils the cause of synergistic interactions between oxide and carbon by DFT calculation. ko
dc.language 영어 ko
dc.publisher ROYAL SOC CHEMISTRY ko
dc.title Synergistic interaction of perovskite oxides and N-doped graphene in versatile electrocatalyst ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85060821970 ko
dc.identifier.wosid 000457546000057 ko
dc.type.rims ART ko
dc.identifier.doi 10.1039/C8TA09919G ko
dc.identifier.url https://pubs.rsc.org/en/Content/ArticleLanding/2018/TA/C8TA09919G#!divAbstract ko
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