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Summary: The use of nickel-iron sulfide nanosheet array on nickel foam as a bifunctional electrocatalyst demonstrates high-performance and cost-effective electrolysis of seawater for hydrogen production. It delivers a current density of 500 mA cm(-2) at overpotentials of 300 and 347 mV for the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) in alkaline seawater respectively. Moreover, it only requires a cell voltage of 1.85 V to drive 500 mA cm(-2) in a two-electrode electrolyzer, and shows strong stability for at least 50 hours of electrolysis in alkaline seawater, outperforming recently reported catalyst electrodes for seawater splitting.
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Qian Wu et al.
Summary: Seawater electrolysis is a promising technology for green hydrogen production. However, traditional powder catalysts have limitations such as slow kinetics, competitive reactions, and corrosion. Self-supported nanoarray catalysts offer better performance with lower resistance, larger surface area, and improved stability. Strategies like constructing porous structures, forming Cl- barrier layer, and developing hydrophilic and hydrophobic surfaces can enhance the catalytic activity and stability of the catalyst.
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Heng Sun et al.
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Lingxia Qiao et al.
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Summary: In this study, an amorphous Co-Mo-B film on Ni foam was developed with superior activity and stability for hydrogen production in alkaline seawater.
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Summary: Seawater electrolysis for hydrogen generation is important due to limited freshwater resources. The development of non-noble-metal-based electrocatalysts with high catalytic activity, long-term durability, and high OER selectivity is crucial. In this study, a three-dimensional core-shell dendritic catalyst has been developed, showing high activity and stability in alkaline seawater.
MATERIALS TODAY PHYSICS
(2022)
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Wenjun Liu et al.
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Lu Li et al.
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M. Ning et al.
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MATERIALS TODAY PHYSICS
(2021)
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Fanghao Zhang et al.
Summary: This review discusses the challenges and strategies for improving the efficiency and stability of seawater electrolysis, focusing on the design of OER catalysts. Various approaches such as constructing 3D hierarchical porous structures, using protective layers, and controlling surface wettability are recommended to synthesize efficient and stable OER catalysts. Additionally, the perspective of designing high-performance catalysts for seawater electrolysis is also provided.
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(2021)
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Yang Cao et al.
Summary: In this study, a hierarchical CuO@NiCo layered double hydroxide core-shell nanoarray on copper foil (CuO@NiCo LDH/CF) was developed as a 3D OER electrocatalyst, showing superior catalytic activity with a high geometrical catalytic current density of 20 mA cm(-2) at an overpotential of 256 mV and strong long-term electrochemical durability for at least 24 hours.
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