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相关概念视频

Limiting Reactant02:27

Limiting Reactant

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The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in reality, the reactants are not always present in the stoichiometric amounts indicated by the balanced equation.
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Hess's Law03:40

Hess's Law

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There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.
44.3K
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

116
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
116
Constant Pressure Calorimetry03:02

Constant Pressure Calorimetry

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Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
84.5K
Boundary Layer Characteristics01:18

Boundary Layer Characteristics

28
When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
28
Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

9.8K
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.
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相关实验视频

Updated: May 24, 2025

The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations
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The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations

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在氧气演化反应发生前和发生期间量化层水位对齐.

Raiden Speelman1, Ezra J Marker1, Franz M Geiger1

  • 1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60660, USA.

Science advances
|March 5, 2025
PubMed
概括

研究人员在氧气演化反应期间观察到电极的水分子方向发生显著变化. 这一发现为电催化和能量转换过程提供了新的见解.

科学领域:

  • 电化学 电化学 电化学
  • 表面科学是一门学科.
  • 物理化学 物理化学

背景情况:

  • 氧进化反应 (OER) 对工业应用至关重要,但了解电极表面的水分子行为仍然具有挑战性.
  • "强吸收器问题"阻碍了直接观察斯特恩层中的水分子如何在应用潜力下重新定位.

研究的目的:

  • 在OER期间调查电极的层中水分子的方向.
  • 确定水分子重定向的能量作为影响反应超电位的因素.

主要方法:

  • 在pH13的电极上使用非线性光学测量.
  • 在法拉第克电流开始之前,分析了水分子从无序状态到有序状态的过渡.

主要成果:

  • 在法拉代电流发生之前,在斯特恩层水分子中观察到一个从混乱到秩序的过渡.
  • 发现一个完整的水单层 (1.1 × 10^15 cm^-2) 与指向电极的氧原子在 +0.8 V 时对齐.
  • 这种对齐的测量工作是80kJ/mol.

结论:

  • 水分子的翻转能量是理解OER过度潜力的关键因素.
  • 这些发现推动了分子电化学的发展,并为电气双层模型提供了基准.

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  • 这项研究为了解电催化机制提供了诊断工具.