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B-site doping effects of NdBa0.75Ca0.25Co2O5+delta double perovskite catalysts for oxygen evolution and reduction reactions

Title
B-site doping effects of NdBa0.75Ca0.25Co2O5+delta double perovskite catalysts for oxygen evolution and reduction reactions
Author
이윤정
Keywords
METAL-AIR BATTERIES; BIFUNCTIONAL HYBRID CATALYSTS; GRAPHENE OXIDE; FUEL-CELLS; WATER OXIDATION; SYNERGISTIC CATALYST; RECENT PROGRESS; ALKALINE MEDIA; DOPED GRAPHENE; IN-SITU
Issue Date
2018-09
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v. 6, no. 36, page. 17807-17818
Abstract
As bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), we introduce an economical, particularly active, stable, and completely noble-metal-free catalyst based on CaO-doped NdBaCo2O5+delta with the aim of exploiting its high catalytic activity for the oxygen electrode. Further, the electrochemical performances of the NdBa0.75Ca0.25Co2O5+delta catalyst are improved by doping transition-metal oxides (Fe2+, Ni2+, Cu2+, and Mn2+) into the B-sites of double perovskite oxides, facilitating the movement of electrons and oxygen-ions through oxygen vacancies. Among these, NdBa0.75Ca0.25Co1.5Fe0.5O5+delta (NBCCFe) shows the highest electrocatalytic oxygen electrode activity for the OER and ORR, and NBCCFe thus is hybridized with nitrogen-reduced graphene oxide (N-rGO) to further improve its catalytic activity with excellent durability. Hybridization of NBCCFe with N-rGO further boosts bifunctional oxygen electrode activity (0.761 V) with better durability, which surpasses those of Pt/C (0.815 V) and Ir/C (0.768 V) catalysts. A rechargeable lithium-air battery assembled with the NBCCFe/N-rGO catalyst exhibits remarkably improved discharge capacity, reduced charge overpotential and an extended cycle life, corroborating the excellent bifunctional catalytic activity of NBCCFe/N-rGO. The NBCCFe/N-rGO catalyst also displays the most improved polarization during both discharge and charge, further confirming the highest bifunctional catalytic activity of NBCCFe/N-rGO.
URI
https://pubs.rsc.org/en/content/articlelanding/2018/TA/C8TA06236F#!divAbstracthttp://repository.hanyang.ac.kr/handle/20.500.11754/119909
ISSN
2050-7488; 2050-7496
DOI
10.1039/c8ta06236f
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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