对于氧气还原反应,位优于N-化碳中的纹理特性
Javier Quílez-Bermejo1, Sara Pérez-Rodríguez2, Daniel Torres2
1Université de Lorraine, Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour (IJL), F-88000 Épinal, France; Departamento de Química Inorgánica and Instituto de Materiales, Universidad de Alicante, Ap. 99, 03080, Spain.
Journal of colloid and interface science
|October 19, 2023
概括
添加碳材料是燃料电池中氧降解反应 (ORR) 的关键. 这项研究发现,兴奋剂对于增强这些电极中的ORR活性比纹理性质更为关键.
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:
- 用添加的碳材料是对的有希望的替代品,用于能源设备中的氧降解反应 (ORR).
- 的功能和纹理特性都会影响这些材料的ORR活性.
- 对于ORR的兴奋剂与纹理性质的相对重要性仍然不清楚.
研究的目的:
- 批判性地比较兴奋剂和纹理特性对ORR活动的影响.
- 为了阐明推动N-化碳中增强ORR性能的主要因素.
- 为优化碳基电催化剂提供基本见解.
主要方法:
- 选择性功能化四个商业活性炭,具有不同的纹理特性.
- 基于改性碳材料对ORR性能进行比较分析.
- 评估活性位点与毛孔结构之间的作用.
主要成果:
- 兴奋剂显著增强ORR活动,超过了纹理特性的影响.
- 对于ORR来说,功能存在和类型比孔隙结构更为关键.
- 这项研究提供了明确的证据,证明了兴奋剂的主导地位.
结论:
- 兴奋剂是改善碳基电极ORR活动的最关键因素.
- 优化含量和类型应优先考虑,而不是仅仅关注纹理特性.
- 这项研究解决了碳电催化领域的一个关键辩论.
相关概念视频
Physical Properties Affecting Solubility
22.7K
Solutions of Gases in Liquids
As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute and solvent species. Unlike solid and liquid solutes, however, there is no solute-solute intermolecular attraction to overcome when a gaseous solute dissolves in a liquid solvent since the atoms or molecules comprising a gas are far separated and experience negligible interactions. Consequently, solute-solvent interactions are the sole...
As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute and solvent species. Unlike solid and liquid solutes, however, there is no solute-solute intermolecular attraction to overcome when a gaseous solute dissolves in a liquid solvent since the atoms or molecules comprising a gas are far separated and experience negligible interactions. Consequently, solute-solvent interactions are the sole...
22.7K
Oxidation-Reduction Reactions
65.1K
Oxidation–Reduction Reactions
65.1K
Oxidative Cleavage of Alkenes: Ozonolysis
10.5K
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
10.5K
Nitrosation of Enols
2.9K
The nitrosation reaction is one of the methods of preparing 1,2-diketones. The enol tautomer of the starting ketone reacts with sodium nitrite in hydrochloric acid, generating the 1,2-diketone after hydrolysis.
2.9K
Nitriles to Amines: LiAlH4 Reduction
3.5K
Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
3.5K
Resonance
54.5K
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
54.5K


