Operando光谱监测CoNiMoO4预催化剂向高效析氧的动态转变

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-06-10 DOI:10.1063/5.0267368

Hongru Hao, Jiahui Wang, Jian Zhou, Zhe Wang, Shuo Shen, Lingling Xu, Zhe Lv, Bo Wei

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引用次数: 0

摘要

电化学水分解在可持续制氢中发挥着关键作用，但其效率受到动力学缓慢析氧反应（OER）的限制。本文合成了CoNiMoO4纳米线，并对其潜在的OER应用进行了评估。利用原位拉曼光谱和紫外-可见光谱对OER操作过程中的动态结构重建进行了监测，揭示了从前体到氢氧化物，最后在高电位下（氧）氢氧化物的相演化过程。Ni的掺杂抑制了氧化成CoO2相，反而促进了CoNiOOH中间体作为活性物质的形成。此外，d波段中心的精确调制优化了氧中间体的吸附能，从而提高了催化活性。这些发现促进了对过渡金属氧化物重构的基本认识，并为设计高效的OER催化剂提供了有价值的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Operando spectroscopic monitoring the dynamic transformation of CoNiMoO4 precatalyst toward efficient oxygen evolution

Electrochemical water splitting plays a pivotal role in sustainable hydrogen generation, but its efficiency remains constrained by kinetically sluggish oxygen evolution reaction (OER). Herein, CoNiMoO4 nanowires were synthesized and evaluated for potential OER application. The dynamic structural reconstruction during OER operation was monitored by combined in situ Raman and UV–vis spectroscopies, which revealed a phase evolution journey from precursor to hydroxide and finally (oxy)hydroxide at high potentials. Ni doping suppressed the complete oxidation to CoO2 phase and instead facilitated the formation of CoNiOOH intermediates as active species. Furthermore, precise modulation of the d-band center optimized the adsorption energy of oxygen intermediates, achieving enhanced catalytic activity. The findings advance the fundamental understanding of reconstruction in transition metal oxides and offer valuable insights for designing efficient OER catalysts.

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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.