揭开硫化物在电催化NO3中的结构演变RR:Cl不可避免的影响
Jiexin Guan1, Lihong Ge1, Qing Yu1
1Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China.
Inorganic chemistry
|February 6, 2025
概括
在电化学酸盐降解过程中,硫化物转化为氧化物,而氧化物种催化氨生产. 这种受离子影响的结构进化是催化剂设计的关键.
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
- 环境科学 环境科学
背景情况:
- 电化学酸盐降解 (NO3RR) 为酸盐污染和氨合成提供了一种双重解决方案.
- -硫化合物是NO3RR的有希望的电催化剂,但它们的催化机制和稳定性需要进一步研究.
研究的目的:
- 在电化学酸盐减少过程中研究不同硫含量的硫化物 (CoSx) 的结构演变和催化活性.
- 阐明离子和现场形成的物种在NO3RR过程中的作用.
主要方法:
- 在性介质中使用三种类型的硫化物 (CoSx, x = 8/9, 2, 1.097) 进行了电化学酸盐减少实验.
- 包括X射线衍射 (XRD) 和传输电子显微镜 (TEM) 在内的in-situ和ex-situ表征被用来分析结构变化.
- 普尔贝克斯图分析被用来预测热力学稳定性.
主要成果:
- 所有的CoS催化剂都表现出高法拉戴效率 (>80%) 和氨产量 (>1780 mmol h-1 gcat-1) 在0.8V与RHE.
- 在NO3RR期间,鉴定发现了CoSx在NO3RR期间意外的结构转化为氧化 (Co(OH) 2,尽管热力学预测稳定性.
- 电解质中的离子被确定为促进这种转换的关键因素.
结论:
- 在性电催化NO3RR条件下,硫化物不可避免地演变为氧化.
- 在现场形成的Co ((OH) 2可能是有效生产氨的活性物种.
- 了解这种结构演变对于设计稳定有效的酸盐降解电催化剂至关重要.
更多相关视频
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
3.5K
10:03Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
25.4K
相关概念视频
Formation of Complex Ions
23.2K
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...
23.2K
Structural Isomerism
19.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.1K
Electrodeposition
576
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
576
Valence Bond Theory
8.4K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.4K
Precipitation Titration Curve: Analysis
1.0K
The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
1.0K
Crystal Field Theory - Octahedral Complexes
26.1K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.1K
