在传统装饰的金阶梯表面上减少二氧化碳
Intissar Kherbach1, Víctor Climent1, Juan M Feliu1
1Department of Physical Chemistry/Institute of Electrochemistry, University of Alicante, Apdo 99, E03080 Alicante, Spain.
The Journal of chemical physics
|June 1, 2023
概括
表面的二氧化碳减排形成了二氧化碳,在高电位和低电位上有不同的机制. 步骤位置对于CO形成至关重要,特别是在更高的潜力下,并且可以通过铜等添加剂来调整.
科学领域:
- 电化学 电化学 电化学
- 表面科学是一门学科.
- 催化剂是一种催化剂.
背景情况:
- 了解二氧化碳减排对于可持续能源技术至关重要.
- (Pt) 表面,特别是带有阶梯的周边表面,是关键的电催化剂.
- 露台与步骤原子在减少二氧化碳中的作用仍然不完全理解.
研究的目的:
- 为了研究一氧化碳 (CO) 从二氧化碳 (CO2) 减少在Pt{111}邻近表面形成的碳氧化物 (CO) 的机制.
- 阐明露台和步骤站点在这种电化学反应中的独特贡献.
- 探索选择性步骤位点修改 (使用Bi和Cu) 对CO形成路径的影响.
主要方法:
- 循环电压测量被用来研究二氧化碳减排动力学.
- 在Pt(111) 周边表面上选择性修改步骤位置,使用 (Bi) 和铜 (Cu) 沉积.
- 分析不同潜能范围 (高潜能和低潜能) 的反应速率和产物形成.
主要成果:
- 根据应用潜力确定了两种机制制度.
- 在高电位 (0.20.4 V RHE) 时,CO2激活发生在步骤位点,形成吸附的CO. 石降低了活性,而铜增强了活性.
- 在低电位 (<0.2 V RHE) 时,CO形成涉及吸附的与阶段地点的活性CO2发生反应,其活性受到的可用性限制.
结论:
- 在Pt(111) 周边表面上的步骤位置在二氧化碳电还原到二氧化碳中发挥着关键作用.
- 反应机制是潜在依赖的,涉及直接的CO2激活在步骤 (高潜力) 或与吸附 (低潜力) 的反应.
- 像铜这样的表面修饰剂可以在步骤位置增强CO的形成,为催化剂优化提供了一条路径.
相关概念视频
Redox 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...
The Carbon Cycle
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
Electrodeposition
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...
Carbonation Shrinkage
Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction facilitates the...
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction facilitates the...
Design Example: Sustainability in Concrete Building
As the construction industry moves towards more eco-friendly practices, concrete's adaptability and its ability to incorporate sustainable features make it a key material in the drive towards greener building solutions.
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground cistern.
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground cistern.


