当前位置: X-MOL 学术Adv. Funct. Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Activating Both Basal Plane and Edge Sites of Layered Cobalt Oxides for Boosted Water Oxidation
Advanced Functional Materials ( IF 19.0 ) Pub Date : 2021-07-08 , DOI: 10.1002/adfm.202103569
Yu Li, Gao Chen, Yanping Zhu, Zhiwei Hu, Ting-Shan Chan, Sixuan She, Jie Dai, Wei Zhou, Zongping Shao

Layered AxCoO2 materials built by stacking layers of CoO2 slabs and inserting alkali ions in between them have shown a promising activity of oxygen evolution reaction (OER) due to their active edge sites. However, the large basal plane areas of the CoO2 slabs show too strong adsorption energy to the reaction intermediates, which is unfavorable for the release of O2. Here, a simple cation-exchange strategy based on Fe3+ and alkali ions is proposed to simultaneously activate both the basal plane and edge sites of AxCoO2 for the OER. X-ray absorption spectroscopy has revealed that the Fe3+ ions deposit both on the surface and edge sites of the CoO2 slabs and enter the interlayer. The cation-exchanged AxCoO2 electrodes show a boosted activity compared to their pristine and conventional Fe-doped AxCoO2 counterparts. This phenomenon is mainly ascribed to the abundant edge-sharing Co–Fe motifs at the edge sites and the charge redistribution in the basal plane sites induced by the insertion of Fe3+ ions. This work provides a novel method to fully exploit layer-structured materials for efficient energy conversion.

中文翻译:

激活层状钴氧化物的基面和边缘位点以促进水氧化

通过堆叠 CoO 2板层并在它们之间插入碱离子构建的层状 A x CoO 2材料由于其活性边缘位点而显示出有希望的析氧反应 (OER) 活性。然而,CoO 2板的大基面面积对反应中间体表现出过强的吸附能,这不利于O 2的释放。在这里,提出了一种基于 Fe 3+和碱离子的简单阳离子交换策略,以同时激活OER的 A x CoO 2的基面和边缘位点。X 射线吸收光谱表明 Fe 3+离子沉积在 CoO 2板的表面和边缘位置并进入夹层。与原始和常规的 Fe 掺杂 A x CoO 2对应物相比,阳离子交换的 A x CoO 2电极显示出增强的活性。这种现象主要归因于边缘位点处丰富的共享边缘 Co-Fe 基序以及由 Fe 3+离子插入引起的基面位点中的电荷重新分布。这项工作提供了一种新方法,可以充分利用层状结构材料进行有效的能量转换。
更新日期:2021-09-16
down
wechat
bug