| NiMoO4纳米线@ZnCo MOF(350)核壳结构复合材料的制备及其析氧电催化性能 |
| Preparation and Oxygen Evolution Reaction Electrocatalytic Performance of NiMoO4 Nanowires@ZnCo MOF(350) Core-Shell Structure Composites |
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| 摘要: 采用液相合成法成功合成了一种新型的ZnCo金属有机骨架（MOF）纳米晶原位生长于NiMoO4纳米线（NWs）表面的复合材料NiMoO4 NWs@ZnCo MOF。经350 ℃低温热处理（所得产物命名为NiMoO4 NWs@ZnCo MOF（350））后，仍旧较好地保持了前驱体的结构和形貌，但在ZnCo MOF内部出现了极少量的Co3O4相，证明发生了轻微热解。化学键C—O—Mo和相异质界面处产生的大量氧空位可以成为活性位点的来源。新的Co3O4相的形成也导致异相界面的进一步增加。此外，少量的热解使核壳结构表面更加粗糙、疏松和多孔，产生更高的比表面积、更快的离子扩散路径和更好的导电性。因此经惰性玻碳电极测试，在10 mA·cm-2电流密度下电催化剂表现出360 mV的低过电位，并保持了30 000 s的长期催化稳定性。 |
| 关键词: 金属有机骨架 纳米材料 核壳结构 析氧反应 电催化剂 |
| 基金项目: 山西省基础研究计划面上项目（No.20210302123332）、国家自然科学基金（No.22178204）以及山西省1331工程资助 |
| Abstract: A novel NiMoO4 NWs@ZnCo MOF (NWs=nanowires) was successfully synthesized by making a layer of ZnCo metal-organic framework (MOF) nanocrystals in situ grown on the NiMoO4 NWs by liquid phase synthesis and then it was heat-treated at 350℃ (named NiMoO4 NWs@ZnCo MOF(350)). It was found that the structure and morphology of the precursor were still well maintained after heat treatment, but a very small amount of Co3O4 phase appeared in ZnCo MOF, indicating that slight pyrolysis occurred. Chemical bonds C-O-Mo and a large number of oxygen vacancies generated at the phase heterointerfaces can become the source of active sites. The formation of a new Co3O4 phase also leads to a further increase in the heterophase interfaces. Furthermore, a little pyrolysis made the surface of the core-shell structure more coarse, loose, and porous, producing a higher specific surface area, faster ionic diffusion path, and better electrical conductivity. Therefore, according to the inert glassy carbon electrode test, the electrocatalyst exhibited a low overpotential of 360 mV at the current density of 10 mA·cm-2 and maintained long-term catalytic stability of 30 000 s. |
| Keywords: metal-organic framework nanomaterials core-shell structure oxygen evolution reaction electrocatalysts |
| 投稿时间：2022-06-18 修订日期：2022-09-18 |
| 摘要点击次数: 1583 |
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| 魏学东,刘楠,乔双燕.NiMoO4纳米线@ZnCo MOF(350)核壳结构复合材料的制备及其析氧电催化性能[J].无机化学学报,2022,38(11):2308-2320. |
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| Support information: 相关附件： 220282_220282-Supporting_Information.docx |
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