相关实验视频
Updated: Jun 22, 2025
06:58
Zinc-Sponge Battery Electrodes that Suppress Dendrites
Published on: September 29, 2020
4.3K
作为耐用且适应温度的Zn-Air电池的有效氧气电催化剂的S块金属Mg介导Co─N─C
Henan Wang1, Xinxin Niu1, Wenxian Liu1
1College of Materials Science and Engineering, Pinghu Institute of Advanced Materials, Zhejiang University of Technology, Hangzhou, 310014, P. R. China.
概括
本研究介绍了用于增强的空气电池 (ZAB) 的Mg修饰的Co-NC催化剂. 新的催化剂在广泛的温度范围内表现出卓越的氧降解反应 (ORR) 活性和卓越的性能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 开发强大的电催化剂对于推进用于广泛温度操作的空气电池 (ZAB) 至关重要.
- 传统的d-d和p-d轨道杂交策略通常会导致由于与氧中间体的过度相互作用而导致低于最佳的性能.
- 需要一种新的方法来微调催化剂电子结构以提高效率.
研究的目的:
- 调查s块金属调制在改进Co─NC催化剂电子结构和催化行为的有效性.
- 为空气电池开发一种高性能电催化剂,能够在各种温度条件下运行.
主要方法:
- 利用密度函数理论 (DFT) 的计算来分析由 (Mg) 结合引起的电子结构变化.
- 合成和表征Mg-修饰的Co─NC (MgCo─NC) 催化剂.
- 评估了空气电池中MgCo─NC的氧降解反应 (ORR) 活性和性能.
主要成果:
- 将Mg纳入Co─NC催化剂显著压低了Co位点的d波段中心,优化了氧中间吸附.
- 与Co-NC和Pt/C相比,MgCo-NC催化剂表现出更高的内在ORR活性,激活能量较低 (10.0kJ mol-1).
- 使用Mg0.1Co0.9─NC的ZAB表现出高功率密度 (157.0mW cm−2),长周期寿命 (1700h),电压衰减最小,以及优异的热稳定性 (2%的容量降低从25到-20°C).
结论:
- S块金属调制,特别是Mg结合,是提高Co-NC电催化剂的催化性能的有效策略.
- 开发的MgCo─NC催化剂具有显著的活性,耐用性和耐温性,使其适用于实际的空气电池应用.
- 这项工作为在具有挑战性的条件下运行的储能设备设计先进的电催化剂提供了有前途的途径.
相关概念视频
03:02Standard Electrode Potentials
43.7K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
43.7K
02:51Metal-Ligand Bonds
20.7K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.7K
01:23Properties of Organometallic Compounds
986
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
986
02:48Ionic Bonding and Electron Transfer
41.4K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
41.4K
03:45Formation of Complex Ions
23.6K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.6K
02:47Voltaic/Galvanic Cells
57.0K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
57.0K