原子分散的稀土二氧化--碳,以促进氧降解反应
Wanling Xiao1, Ji Huang1, Cunhuai Yu1
1Collaborative Innovation Center of Sustainable Energy Materials, School of Physical Science and Technology, Guangxi University, Guangxi Key Laboratory of Electrochemical Energy Materials, State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004, China.
Journal of colloid and interface science
|January 9, 2025
概括
与铁--碳 (FeNC) 和相比,原子分散的二--碳 (DyNC) 催化剂表现出优异的氧降解反应 (ORR) 性能. 这为在非贵金属电催化剂中使用稀土金属开辟了道路.
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:
- 过渡金属--碳 (MNC) 催化剂,通常使用3d金属,正在探索氧减少反应 (ORR).
- 基于稀土金属的跨国公司在很大程度上被忽视,因为在协调大型原子半径与剂方面存在挑战.
研究的目的:
- 开发新的原子分散的二--碳 (DyNC) 纳米片作为ORR的高效电催化剂.
- 研究DynC在酸性和性介质中的催化活性和性能,以及在实际的空气电池中.
主要方法:
- 通过溶解dysprosium(III) 酸盐化合物与化NaCl中的TPTZ连接体的热解合成DynC纳米片.
- 对于ORR活动的DynNC的电化学表征,包括半波电位测量.
- 使用DynNC作为阴极催化剂制造和测试一个空气电池.
- 理论计算以比较Dyn4O1和FeN4活性位点的ORR性能.
主要成果:
- 原子分散的DynC纳米片被成功合成,具有由N和O作为活性位点协调的单个Dy原子.
- DyNC表现出优越的ORR性能,半波电位为0.77V (酸性) 和0.88V (性),性能优于FeNC.
- 采用 DyNC 的空气电池实现了 216 mW cm-2 的最大功率输出,超过了商业 Pt/C 催化剂.
- 理论计算证实,Dyn4O1部分比FeN4部分具有较低的ORR超电位 (0.570V).
结论:
- 原子分散的二--碳 (DyNC) 是ORR的高效非贵金属电催化剂.
- 独特的Dyn4O1活性部位显示出显著的催化活性,为传统的3D过渡金属提供了替代品.
- 这项工作突出了4f稀土金属在开发用于能源转换应用的先进电催化剂方面的潜力.
相关概念视频
01:23Redox Equilibria: Overview
521
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
521
01:24Redox Reactions
55.4K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
55.4K
03:11Oxidation-Reduction Reactions
64.2K
Oxidation–Reduction Reactions
64.2K
01:26Redox Titration: Other Oxidizing and Reducing Agents
238
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
238
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
9.8K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
9.8K
01:19Oxidation and Reduction of Organic Molecules
6.1K
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
The removal of an electron from a molecule, results in a...
6.1K