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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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Gettering La Effect from La3IrO7 as a Highly Efficient Electrocatalyst for Oxygen Evolution Reaction in Acid Media

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Title
Gettering La Effect from La3IrO7 as a Highly Efficient Electrocatalyst for Oxygen Evolution Reaction in Acid Media
Author
Qin, QingJang, HaeseongWang, YimengZhang, LijieLi, ZijianKim, Min GyuLiu, ShangguoLiu, XienCho, Jaephil
Issue Date
2021-02
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED ENERGY MATERIALS, v.11, no.5, pp.2003561
Abstract
Developing highly active, durable, and cost-effective electrocatalysts for the oxygen evolution reaction (OER) is of prime importance in proton exchange membrane (PEM) water electrolysis techniques. Herein, a surface lanthanum-deficient (SLD) iridium oxide as a highly efficient OER electrocatalyst is reported (labeled as La3IrO7-SLD), which is obtained by electrochemical activation, and shows better activity and durability than that of commerically available IrO2 as well as most of the reported Ir-based OER electrocatalysts. At a current density of 10 mA cm(-2), the overpotential of La3IrO7-SLD is 296 mV, which is lower than that of IrO2 (316 mV). Impressively, the increase of potential is less than 50 mV at a voltage-time chronopotentiometry extending for 60 000 s using a glass carbon electrode that is vastly superior to IrO2. Moreover, the mass activity of the catalyst is approximately five times higher than that of IrO2 at 1.60 V versus reversible hydrogen electrode. Density functional theory calculations suggest that a lattice oxygen participating mechanism with central Ir atoms serving as active sites (LOM-Ir) rationalizes the high activity and durability for the La3IrO7-SLD electrocatalyst. The favorable energy level of surface active Ir 5d orbitals relative to coordinated O 2p orbitals makes the La3IrO7-SLD more active.
URI
https://scholarworks.unist.ac.kr/handle/201301/50032
URL
https://onlinelibrary.wiley.com/doi/10.1002/aenm.202003561
DOI
10.1002/aenm.202003561
ISSN
1614-6832
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