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

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-?) and molybdenum diselenide (MoSe2) as an electrochemical catalyst for overall water electrolysis. Interestingly, formation of the heterostructure of La0.5Sr0.5CoO3-? and MoSe2 induces a local phase transition in MoSe2, 2?H to 1?T phase, and more electrophilic La0.5Sr0.5CoO3-? 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.

SUBMITTER: Oh NK 

PROVIDER: S-EPMC6461638 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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In-situ local phase-transitioned MoSe<sub>2</sub> in La<sub>0.5</sub>Sr<sub>0.5</sub>CoO<sub>3-δ</sub> heterostructure and stable overall water electrolysis over 1000 hours.

Oh Nam Khen NK   Kim Changmin C   Lee Junghyun J   Kwon Ohhun O   Choi Yunseong Y   Jung Gwan Yeong GY   Lim Hyeong Yong HY   Kwak Sang Kyu SK   Kim Guntae G   Park Hyesung H  

Nature communications 20190412 1

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 (La<sub>0.5</sub>Sr<sub>0.5</sub>CoO<sub>3-δ</sub>) and molybdenum diselenide (MoSe<sub>2</sub>) as an electrochemical catalyst for overall water electrolysis. Interestingly,  ...[more]

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