设计一个有层次的多孔碳与优化的兴奋剂,以实现高效的氧降低反应
Xingkai Peng1, Xiaowei Zhao1, Yuekun Hu1
1School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300131, China.
ChemPlusChem
|June 13, 2023
概括
研究人员使用酸开发了一种新化剂的层次性多孔碳催化剂. 这种无金属催化剂在空气电池中表现出优越的氧降低活性和较高的功率密度,与类催化剂相比.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 添加碳材料是氧降解反应中催化剂的有希望的替代品.
- 目前的化碳在催化活性方面仍然落后于/碳 (Pt/C).
- 开发具有成本效益,高性能无金属催化剂对于电化学应用至关重要.
研究的目的:
- 开发一种高度反应的化剂等级性多孔碳催化剂.
- 研究涉及酸和富含氨基酸的前体的合成策略.
- 评估催化剂在氧降解反应和空气电池中的性能.
主要方法:
- 酸和富含氨基酸的反应剂的初级热解.
- 使用硬模板方法来创建半孔结构.
- 在多孔的碳框架中包含- (Zn-Nx) 结构.
- 氧减少反应 (ORR) 和空气电池中的催化剂的电化学测试.
主要成果:
- 合成的催化剂,Zn(OAc) 2 -DCD/HPC,在ORR中表现出0.909V与RHE的高半波潜力,超过商业Pt/C (0.872V与RHE).
- 使用Zn(OAc) 2 -DCD/HPC作为阴极的气电池达到198mW cm-2的峰值功率密度,超过Pt/C (168mW cm-2).
- 该策略有效优化了层次性的多孔结构和兴奋剂,从而提高了催化活性.
结论:
- 开发的方法成功地产生了高活性胺合的层次性多孔碳.
- 催化剂显示出作为减少氧气和储存能源的白金无金属替代品的巨大潜力.
- 这种方法为设计先进的无金属催化剂提供了新的途径.
更多相关视频
10:44Preparation of Biomass-based Mesoporous Carbon with Higher Nitrogen-/Oxygen-chelating Adsorption for CuII Through Microwave Pre-Pyrolysis
Published on: February 12, 2019
10.0K
08:40Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
3.6K
相关概念视频
01:24Redox Reactions
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...
02:27Limiting Reactant
The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in reality, the reactants are not always present in the stoichiometric amounts indicated by the balanced equation.
02:58Balancing Redox Equations
Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
01:23Redox Equilibria: Overview
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...
01:26Redox Titration: Other Oxidizing and Reducing Agents
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...
01:18Bioreactor Controls-II
In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...