对于固体氧化物电池的8YSZ和10Sc1CeSZ电解质中的离子和佩尔蒂埃系数的输送
Aydan Gedik1, Stephan Kabelac1
1Institute of Thermodynamics, Leibniz University Hannover, Welfengarten 1, D-30167 Hannover, Germany.
Entropy (Basel, Switzerland)
|October 25, 2024
概括
这项研究量化了固体氧化物细胞 (SOC) 中的离子运输,以改进热传输建模. 在10Sc1CeSZ电解质中观察到较高的离子,这对于热管理至关重要.
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
- 热力学是一种热力学.
背景情况:
- 在固体氧化物电池 (SOC) 中精确建模热传输对于高效的热管理至关重要.
- 了解离子的输送对于预测和控制 SOC 内的热效应至关重要.
研究的目的:
- 通过实验确定8YSZ和10Sc1CeSZ电解质中的离子的输送.
- 为了能够精确地建模固体氧化物细胞中的热传输现象.
- 直接计算佩尔蒂埃系数用于评估可逆热传输.
主要方法:
- 对8YSZ和10Sc1CeSZ的输送离子的实验性确定.
- 直接计算佩尔蒂埃系数的方法.
- 通过在不同的电池操作模式中通过理论计算验证传输.
主要成果:
- 与8YSZ相比,10Sc1CeSZ电解质的输送离子 entropies较高.
- 在700°C和pO2=0.21 bar时,运输的入量为10Sc1CeSZ的SO2-*=52±10 J/K·F和8YSZ的SO2-*=48±9 J/K·F.
- 温度显著影响SOC中的热量产生,而离子也起着作用.
结论:
- 经过实验确定的传输离子 entropies 为SOCs中准确的热传输建模提供了关键数据.
- 这些发现凸显了离子在SOC内热管理和热量产生中的重要性.
- 8YSZ的佩尔蒂尔系数与现有的文献值保持一致.
相关概念视频
03:00Electrolysis
26.1K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.1K
01:19Ionic Strength: Effects on Chemical Equilibria
1.4K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.4K
01:21Carrier Transport
408
The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
408
02:54Molecular and Ionic Solids
17.0K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
17.0K
01:12Ionic Strength: Overview
1.3K
The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
1.3K
02:54Trends in Lattice Energy: Ion Size and Charge
23.8K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
23.8K