高OER电流密度下nife基（氧）氢氧化物的准原位再定位稳定

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-04-14 DOI:10.1063/5.0261319

Meng-Yuan Xie, Jia-Rong Huang, Hui Wan, Jianhang Nie, Ming-Hua Xian, Zhen-Yang Ou-Yang, Gui-Fang Huang, Wei-Qing Huang

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引用次数: 0

摘要

镍铁基（氧）氢氧化物是一种很有前途的氧进化反应（OER）催化剂，但在操作条件下会出现严重的铁溶解现象，迅速导致活性显著下降。在此，我们报告了一种通过掺杂 Ce 实现准原位再沉积的策略，从而在 NiFeOOH 表面快速捕获和沉积铁物种。在 OER 过程中，溶解的 Ce 离子由于具有较大的离子半径和较强的静电吸引力，会提高固液界面的 OH- 浓度，从而加速铁的再沉积并抑制铁向电解质中的浸出。这大大提高了高电流密度下的活性和耐久性。优化后的 Ce-NiFeOOH 催化剂在 1000 mA cm-2 时的过电位为 294 mV，在 500 mA cm-2 时保持了极佳的稳定性。这一策略为设计用于 OER 的高度稳定的过渡金属基（氧）氢氧化物提供了一个可行的方向。

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Quasi-in situ redeposition-enabled stabilization of NiFe-based (oxy)hydroxides under high OER current density

NiFe-based (oxy)hydroxides are promising oxygen evolution reaction (OER) catalysts but suffer from severe Fe dissolution under operational conditions, rapidly resulting in a significant drop in activity. Here, we report a quasi-in situ redeposition strategy enabled by Ce doping to realize rapid capture and deposition of Fe species on the surface of NiFeOOH. During the OER process, dissolved Ce ions, owing to their large ionic radius and strong electrostatic attraction, enhance OH− concentration at the solid–liquid interface, accelerating Fe redeposition and suppressing Fe leaching into the electrolyte. This significantly enhances activity and durability under high-current density. The optimized Ce-NiFeOOH catalyst delivers an overpotential of 294 mV at 1000 mA cm−2 and maintains excellent stability at 500 mA cm−2. This strategy offers a feasible direction to design highly stable transition-metal-based (oxy)hydroxides for the OER.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.