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相关概念视频

Factors Affecting Solubility04:01

Factors Affecting Solubility

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
Electrolysis03:00

Electrolysis

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...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...

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相关实验视频

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On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Method
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使用溶解-再结晶策略获得缺陷的碳,用于减少氧气,电催化.

Da Bi1, Nailu Shen1, Zeming Tang1

  • 1College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, 29 Jiangjun Ave., Nanjing 210016, China.

ACS applied materials & interfaces
|June 15, 2023
PubMed
概括

使用简单的溶解-再结晶策略合成了无添加剂的有缺陷的碳纳米棒. 这些材料显示出优异的氧降解反应活性和空气电池的潜在用途.

关键词:
ZnO的激活方式有缺陷的碳有缺陷的碳溶解-再结晶的过程无添加剂的碳电催化剂氧降解反应反应的氧降解反应

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Development and Validation of Chromium Getters for Solid Oxide Fuel Cell Power Systems
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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
  • 催化剂是一种催化剂.

背景情况:

  • 无添加剂的有缺陷的碳电催化剂为贵金属催化剂提供了一个环保的替代方案.
  • 合成这些碳通常需要恶劣的条件,这给缺陷控制和有效利用带来了挑战.
  • 开发用于创建活跃缺陷的简单方法对于推动这一领域的发展至关重要.

研究的目的:

  • 开发一个简单的合成策略,用于无兴奋剂的有缺陷的碳电催化剂.
  • 为了同步控制碳缺陷和质量转移通道.
  • 调查合成材料的氧降解反应 (ORR) 的电催化性能.

主要方法:

  • 用一种溶解-再结晶策略来设计Zn-MOF-74前体.
  • 棒状Zn-MOF-74前体被直接碳化,产生一个维的多孔缺陷碳纳米棒 (d-CNRs).
  • 合成的d-CNRs的形态,结构和表面积的特征.

主要成果:

  • 合成产生了一维的多孔缺陷碳纳米棒 (d-CNRs),具有独特的孔隙裂嵌套结构.
  • d-CNRs表现出高特异性表面积 (2459 m2/g) 与丰富的缺陷和介质孔,作为ORR的活跃地点.
  • 该材料表现出优异的ORR电催化活性和分子选择性,在空气电池中表现稳定超过60小时.

结论:

  • 溶解-再结晶策略为合成无兴奋剂有缺陷的碳电催化剂提供了一个简单而可控的途径.
  • 合成的d-CNR显示出作为ORR和储能应用的高效和稳定的电催化剂的巨大潜力.
  • 这种方法克服了复杂的制备条件对高性能无添加剂碳的局限性.