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

Nam Khen Oh, Changmin Kim, Junghyun Lee, Ohhun Kwon, Yunseong Choi, Gwan Yeong Jung, Hyeong Yong Lim, Sang Kyu Kwak (), Guntae Kim () and Hyesung Park ()
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Nam Khen Oh: Ulsan National Institute of Science and Technology (UNIST)
Changmin Kim: Ulsan National Institute of Science and Technology (UNIST)
Junghyun Lee: Ulsan National Institute of Science and Technology (UNIST)
Ohhun Kwon: Ulsan National Institute of Science and Technology (UNIST)
Yunseong Choi: Ulsan National Institute of Science and Technology (UNIST)
Gwan Yeong Jung: Ulsan National Institute of Science and Technology (UNIST)
Hyeong Yong Lim: Ulsan National Institute of Science and Technology (UNIST)
Sang Kyu Kwak: Ulsan National Institute of Science and Technology (UNIST)
Guntae Kim: Ulsan National Institute of Science and Technology (UNIST)
Hyesung Park: Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2019, vol. 10, issue 1, 1-12

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-09339-y

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