<br>MOF衍生的钴@介孔碳作为析氧反应的电催化剂：有机连接体的影响,Langmuir

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MOF衍生的钴@介孔碳作为析氧反应的电催化剂：有机连接体的影响
Langmuir ( IF 3.7 ) Pub Date : 2023-01-06 , DOI: 10.1021/acs.langmuir.2c02873
Aymen S Abu Hatab _{1,

2,

3} , Yahia H Ahmad ₃ , Muna Ibrahim ₃ , Alaa Elsafi Ahmed ₃ , Mohd Basyaruddin Abdul Rahman _{1,

2} , Siham Y Al-Qaradawi ₃

Affiliation

水电解作为一种绿色能源生产途径引起了科学家的关注。然而，析氧反应（OER）的缓慢动力学显着增加了反应过电势。在这项工作中，我们开发了钴基纳米材料作为具有成本效益、高效的 OER 催化剂。在这方面，使用不同的有机连接体合成了不同的钴基金属有机框架（MOF）。在惰性气氛下退火后，制备了相应的钴嵌入介孔碳（Co/MC）材料。其中，与同类材料相比，使用2-甲基咪唑合成的Co/MC（Co/NMC-2MeIM）表现出最高的表面积（412 m ² /g）。此外，如拉曼光谱所示，它表现出更高程度的缺陷。 Co/NMC-2MeIM 在碱性介质中表现出最佳的 OER 催化性能。它在 10 mA cm ^–2的电流密度下提供 292 mV 的过电势，塔菲尔斜率为 99.2 mV dec ^–1 。 Co/NMC-2MeIM的优异电催化性能归因于其表面Co ³⁺含量高、表面积大以及氮掺杂导致的导电性增强。此外，其高含量的吡啶-N和高缺陷度显着增强了吸附的氧物质和活性位点之间的电荷转移。这些结果可能为进一步研究金属/碳材料在广泛的电催化应用中铺平道路。

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MOF-Derived Cobalt@Mesoporous Carbon as Electrocatalysts for Oxygen Evolution Reaction: Impact of Organic Linker

Water electrolysis has attracted scientists’ attention as a green route for energy generation. However, the sluggish kinetics of oxygen evolution reaction (OER) remarkably increases the reaction overpotential. In this work, we developed Co-based nanomaterials as cost-effective, highly efficient catalysts for OER. In this regard, different Co-based metal–organic frameworks (MOFs) were synthesized using different organic linkers. After annealing under inert atmosphere, the corresponding Co-embedded mesoporous carbon (Co/MC) materials were produced. Among them, Co/MC synthesized using 2-methyl imidazole (Co/NMC-2MeIM) expressed the highest surface area (412 m²/g) compared to its counterparts. Furthermore, it expressed a higher degree of defects as depicted by Raman spectra. Co/NMC-2MeIM exhibited the best catalytic performance toward OER in alkaline medium. It afforded an overpotential of 292 mV at a current density of 10 mA cm^–2 and a Tafel slope of 99.2 mV dec^–1. The superior electrocatalytic performance of Co/NMC-2MeIM is attributed to its high content of Co³⁺ on the surface, high surface area, and enhanced electrical conductivity induced by nitrogen doping. Furthermore, its high content of pyridinic-N and high degree of defects remarkably enhance the charge transfer between the adsorbed oxygen species and the active sites. These results may pave the avenue toward further investigation of metal/carbon materials in a wide range of electrocatalytic applications.

更新日期：2023-01-06

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