O2-可访问的Fe-N4 活跃站点密度提高了有效的氧气减少到燃料电池水平
Tianyu Zhang1, Chen Liang2, Shilun Sun2
1Faculty of Maritime and Transportation, Ningbo University, Ningbo, China.
Advanced materials (Deerfield Beach, Fla.)
|February 17, 2026
概括
合理的纳米结构设计是有效催化剂的关键. 优化的黄Fe-NC催化剂通过改善氧气可进入活性部位,显著提高了氧降解反应 (ORR) 的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 纳米技术 纳米技术
背景情况:
- 在实际应用中,内在的催化活性往往受到大规模运输的限制.
- 层次纳米结构对于克服扩散限制和提高催化剂效率至关重要.
- 原子分散的Fe-NC催化剂对氧减少反应 (ORR) 是有前途的.
研究的目的:
- 研究纳米结构设计对氧气可访问性和ORR性能的影响.
- 开发一种依赖于pH值的策略,用于创建层次化的Fe-NC结构 (固体,黄皮,空心).
- 为了比较不同Fe-NC架构的质量传输特性和催化活性.
主要方法:
- 通过pH取决的操纵合成具有不同纳米结构 (固体,黄皮,空洞) 的Fe-NC催化剂.
- Fe-N4位点密度和多孔性的表征.
- 电化学评估ORR活动,包括半波潜力和扩散限制电流密度 (j_d).
- 在燃料电池设置中进行测试,以评估功率密度.
主要成果:
- 蛋黄的Fe-NC (y-Fe/NC) 结构表现出优化氧可访问活性位点密度 (ASD) 由于增强的孔隙性和连接性.
- y-Fe/NC结构表现出高于理论值的j_d,这归因于局部循环效应和增加的O2可访问的ASD.
- y-Fe/NC实现了0.82 V的半波电位和7.66 mA cm-2的j_d,超过了其他结构和最先进的催化剂.
- 优化的y-Fe/NC催化剂在燃料电池中保持了高性能,提供1.03W cm−2.2的功率密度.
结论:
- 理性设计的层次纳米结构,特别是黄皮架构,通过确保足够的氧气可访问性来最大限度地提高催化剂性能是必不可少的.
- 这项研究强调了纳米结构工程在克服大规模运输局限性的关键作用,以实现高效的氧降解反应.
- 具有层次结构的优化Fe-NC催化剂显示了燃料电池和其他能源转换技术应用的巨大潜力.
相关概念视频
Batteries and Fuel Cells
31.2K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
31.2K
Oxygen Transport in the Blood
7.0K
Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
7.0K
Gas Exchange and Transport
77.3K
Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.
77.3K
Oxygenic Photosynthesis
815
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
815
Oxygen Requirements and Growth Patterns
1.6K
Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:● Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the...
1.6K
Role of Reduced Coenzymes NADH and FADH₂
17.4K
The energy released from the breakdown of the chemical bonds within nutrients can be stored either through the reduction of electron carriers or in the bonds of adenosine triphosphate (ATP). In living systems, a small class of compounds functions as mobile electron carriers, molecules that bind to and shuttle high-energy electrons between compounds in pathways. The principal electron carriers that will be considered originate from the B vitamin group and are derivatives of nucleotides; they are...
17.4K


