在Pd表面的宽潜在窗口上促进电催化CO2的形式生产
Bei Jiang1, Xia-Guang Zhang2, Kun Jiang3
1Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry, Fudan University , Shanghai 200433, P. R. China.
Journal of the American Chemical Society
|February 8, 2018
概括
用添加的催化剂 (Pd-B/C) 有效地将二氧化碳 (CO2) 转化为酸盐,这是储能的一个关键步骤. 这种新的催化剂可使二氧化碳和酸 (FA) 之间在可持续能源应用中轻松相互转换.
科学领域:
- 电化学
- 催化剂
- 材料科学
- 储能和转化
背景情况:
- 在 (Pd) 表面上,二氧化碳的电化学降解通常发生在狭窄的电位范围内.
- 对于储能和碳中和技术而言,有效的二氧化碳与甲酸之间的相互转换至关重要.
- 现有的Pd催化剂在减少二氧化碳的效率和选择性方面存在局限性.
研究的目的:
- 探索添加Pd催化剂 (Pd-B/C) 用于在扩大潜力范围内的电化学CO2降低.
- 调查催化剂在促进二氧化碳和酸/酸盐之间的相互转换方面的性能.
- 了解兴奋剂在增强催化活性和选择性的作用.
主要方法:
- 使用 Pd-B/C 和 Pd/C 催化剂的电化学 CO2 减排实验.
- 在CO2和的KHCO3电解中进行电解.
- 密度函数理论 (DFT) 计算以分析反应机制和中间能量.
主要成果:
- Pd-B/C 在 -0.5 V 和 RHE 之间实现了 70% 的格式法度效率 (ηHCOO),显著优于 Pd/C.
- 甲酸盐度在Pd-B/C上是Pd/C的18倍,显示出更高的催化活性.
- DFT的计算表明,兴奋剂有利于形成甲酸盐中间体 (HCOO*),而不是CO途径中间体 (*COOH).
结论:
- Pd-B/C作为可逆CO2/酸相互转换的高效双功能催化剂.
- 兴奋剂增强了二氧化碳的减少,并提高了选择性,克服了传统Pd催化剂的局限性.
- 这种催化剂为高效储能和碳利用提供了有前途的途径.
相关概念视频
03:11Oxidation-Reduction Reactions
75.9K
Oxidation–Reduction Reactions
75.9K
03:02Standard Electrode Potentials
50.6K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
50.6K
01:26PD Controller: Design
669
In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
669
01:07Time-Domain Interpretation of PD Control
408
Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
Consider the example of control of motor torque. Initially, a positive...
408
02:58Cell Potential and Free Energy
46.8K
Thermodynamics of a Redox Reaction
Thermodynamics is the branch of physics dealing with the relationship between heat and other forms of energy. In an electrochemical cell, chemical energy is converted into electrical energy.
Thus, a link can be predicted between cell potential, free energy change, and the equilibrium constant for the reaction. Cell potential can also be measured as the oxidant or the reducing strength, and similar acid-base strength measures are reflected in equilibrium...
Thermodynamics is the branch of physics dealing with the relationship between heat and other forms of energy. In an electrochemical cell, chemical energy is converted into electrical energy.
Thus, a link can be predicted between cell potential, free energy change, and the equilibrium constant for the reaction. Cell potential can also be measured as the oxidant or the reducing strength, and similar acid-base strength measures are reflected in equilibrium...
46.8K
02:37Standard Enthalpy of Formation
49.6K
Enthalpy changes are typically tabulated for reactions in which both the reactants and products are at the same conditions. A standard state is a commonly accepted set of conditions used as a reference point for the determination of properties under other different conditions. For chemists, the IUPAC standard state refers to materials under a pressure of 1 bar and solutions at 1 M and does not specify a temperature. Many thermochemical tables list values with a standard state of 1 atm. Because...
49.6K