In-situ local phase-transitioned MoSe2 in La0.5Sr0.5CoO3-δ heterostructure and stable overall water electrolysis over 1000 hours

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Title
In-situ local phase-transitioned MoSe2 in La0.5Sr0.5CoO3-δ heterostructure and stable overall water electrolysis over 1000 hours
Author
Oh, Nam KhenKim, ChangminLee, JunghyunKwon, OhhunChoi, YunseongJung, Gwan YeongLim, Hyeong YongKwak, Sang KyuKim, GuntaePark, Hyesung
Issue Date
2019-04
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v.10, no.1, pp.1723
Abstract
Developing efficient bifunctional catalysts for overall water splitting that are earth-abundant, cost-effective, and durable is of considerable importance from the practical perspective to mitigate the issues associated with precious metal-based catalysts. Herein, we introduce a heterostructure comprising perovskite oxides (La0.5Sr0.5CoO3–δ) and molybdenum diselenide (MoSe2) as an electrochemical catalyst for overall water electrolysis. Interestingly, formation of the heterostructure of La0.5Sr0.5CoO3–δ and MoSe2 induces a local phase transition in MoSe2, 2 H to 1 T phase, and more electrophilic La0.5Sr0.5CoO3–δ with partial oxidation of the Co cation owing to electron transfer from Co to Mo. Together with these synergistic effects, the electrochemical activities are significantly improved for both hydrogen and oxygen evolution reactions. In the overall water splitting operation, the heterostructure showed excellent stability at the high current density of 100 mA cm−2 over 1,000 h, which is exceptionally better than the stability of the state-of-the-art platinum and iridium oxide couple.
URI
https://scholarworks.unist.ac.kr/handle/201301/26590
URL
https://www.nature.com/articles/s41467-019-09339-y
DOI
10.1038/s41467-019-09339-y
ISSN
2041-1723
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