1. NiFe layered-double-hydroxide nanosheet arrays grown in situ on Ni foam for efficient oxygen evolution reaction.
- Author
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Dai, Jiaqi, Zhang, Yuxing, Song, Haosen, and Liu, Lu
- Subjects
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RAMAN spectroscopy , *ELECTRONIC structure , *ELECTROCATALYSTS , *SEAWATER , *CATALYSTS , *ARTIFICIAL seawater - Abstract
Developing efficient and stable oxygen evolution reaction (OER) electrocatalysts under various alkaline conditions is crucial for commercial hydrogen (H₂) production. This study synthesized superhydrophilic NiFe LDH/NF with a nanosheet structure. The strong electronic interactions between the metals modify the electronic structures of Ni and Fe. In-situ Raman spectroscopy reveals numerous high-valent nickel intermediates with high OER activity during the reaction, significantly improving the catalyst's overall performance. At room temperature, the NiFe LDH/NF catalyst exhibits a current density of 50/100 mA cm−2 with only 217/233 mV required in 1 M KOH. Moreover, the catalyst requires only 180 mV under industrial conditions (60 °C, 6 M KOH), 243 mV in alkaline artificial seawater, and 280 mV in alkaline natural seawater to achieve 100 mA cm−2. The catalyst also exhibits long-term operational durability under these conditions, indicating a wide range of potential applications. [Display omitted] • NiFe LDH was directly grown in situ on a nickel foam surface by a hydrothermal method. • The catalyst's nanosheet structure and superhydrophilicity enhance the exposure of active sites to the electrolyte. • The two metalssynergistically alter the electronic structure,generating numerous high-valent active metals. • The catalysts demonstrate high activity and stability in alkaline media, even under harsh industrial conditions and seawater. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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