Manipulating anion intercalation into layered double hydroxide for alkaline seawater oxidation at high current density†

IF 4.4 3区化学 Q2 CHEMISTRY, PHYSICAL

Catalysis Science & Technology Pub Date : 2024-09-16 DOI:10.1039/d4cy00842a

Yuewen Wu , Mingpeng Chen , Huachuan Sun , Guohao Na , Dequan Li , Boxue Wang , Yun Chen , Tong Zhou , Guoyang Qiu , Jianhong Zhao , Yumin Zhang , Jin Zhang , Feng Liu , Hao Cui , Qingju Liu

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Abstract

In this work, we propose a convenient strategy to manipulate anion intercalation into layered double hydroxide. The obtained NiFe LDH-Cl⁻ electrode shows outstanding OER performance with both low overpotentials and high stability in alkaline seawater at high current density. Ultra-low overpotentials of 255 mV and 350 mV are required in 1 M KOH and alkaline seawater at a current density of 200 mA cm⁻². In addition, NiFe LDH-Cl⁻ can stably operate at 200 mA cm⁻² for 100 h. In situ Raman studies reveal that the active γ-NiOOH is generated on NiFe LDH-Cl⁻ at a low potential by surface reconstruction, and Cl⁻ intercalation helps optimize the peak area ratio of E_g and A_1g, which can be favorable for the alkaline seawater OER.

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操纵阴离子插层到层状双氢氧化物中，实现高电流密度下的碱性海水氧化

在这项工作中，我们提出了一种将阴离子插层到层状双氢氧化物中的便捷策略。所获得的镍铁合金 LDH-Cl- 电极在高电流密度的碱性海水中表现出卓越的 OER 性能，既具有低过电位，又具有高稳定性。在电流密度为 200 mA cm-2 的 1 M KOH 和碱性海水中，过电位分别为 255 mV 和 350 mV。此外，NiFe LDH-Cl- 可在 200 mA cm-2 下稳定运行 100 小时。原位拉曼研究表明，活性 γ-NiOOH 是在低电位下通过表面重构在 NiFe LDH-Cl- 上生成的，Cl- 插层有助于优化 Eg 和 A1g 的峰面积比，这对碱性海水 OER 是有利的。

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来源期刊

Catalysis Science & Technology CHEMISTRY, PHYSICAL-

CiteScore

8.70

自引率

6.00%

发文量

587

审稿时长

1.5 months

期刊介绍： A multidisciplinary journal focusing on cutting edge research across all fundamental science and technological aspects of catalysis. Editor-in-chief: Bert Weckhuysen Impact factor: 5.0 Time to first decision (peer reviewed only): 31 days