Dataset Information

In-situ local phase-transitioned MoSe₂ in La_0.5Sr_0.5CoO_3-? 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 (La_0.5Sr_0.5CoO_3-?) and molybdenum diselenide (MoSe₂) as an electrochemical catalyst for overall water electrolysis. Interestingly, formation of the heterostructure of La_0.5Sr_0.5CoO_3-? and MoSe₂ induces a local phase transition in MoSe₂, 2?H to 1?T phase, and more electrophilic La_0.5Sr_0.5CoO_3-? 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 MoSe2 in La0.5Sr0.5CoO3-δ 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 (La0.5Sr0.5CoO3-δ) and molybdenum diselenide (MoSe2) as an electrochemical catalyst for overall water electrolysis. Interestingly, ...[more]

PMID: 30979877

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Project description:The further development of solid oxide fuel and electrolysis cells (SOFC/SOEC) strongly relies on research activities dealing with electrode materials. Recent studies showed that under operating conditions many perovskite-type oxide electrodes are prone to changes of their surface composition, leading to severe changes of their electrochemical performance. This results in a large scatter of data in literature and complicates comparison of materials. Moreover, little information is available on the potentially excellent properties of surfaces immediately after preparation, that is, before any degradation by exposure to other gas compositions or temperature changes. Here, we introduce in situ impedance spectroscopy during pulsed laser deposition (IPLD) as a new method for electrochemical analysis of mixed ionic and electronic conducting (MIEC) thin films during growth. First, this approach can truly reveal the properties of as-prepared MIEC electrode materials, since it avoids any alterations of their surface between preparation and investigation. Second, the measurements during growth give information on the thickness dependence of film properties. This technique is applied to La0.6Sr0.4CoO3-? (LSC), one of the most promising SOFC/SOEC oxygen electrode material. From the earliest stages of LSC film deposition on yttria-stabilized zirconia (YSZ) to a fully grown thin film of 100 nm thickness, data are gained on the oxygen exchange kinetics and the defect chemistry of LSC. A remarkable reproducibility is found in repeated film growth experiments, not only for the bulk related chemical capacitance but also for the surface related polarization resistance (±10%). Polarization resistances of as-prepared LSC films are extraordinarily low (2.0 ? cm2 in 40 ?bar O2 at 600 °C). LSC films on YSZ and on La0.95Sr0.05Ga0.95Mg0.05O3-? (LSGM) single crystals exhibit significantly different electrochemical properties, possibly associated with the tensile strain of LSC on LSGM.

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In-situ local phase-transitioned MoSe₂ in La_0.5Sr_0.5CoO_3-? heterostructure and stable overall water electrolysis over 1000 hours.

Publications

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.

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

Publications

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.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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In-situ local phase-transitioned MoSe₂ in La_0.5Sr_0.5CoO_3-? heterostructure and stable overall water electrolysis over 1000 hours.