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Electrolysis03:00

Electrolysis

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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...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
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基于的电催化剂用于水分离.

Andrés M R Ramírez1,2, Sima Heidari3,4,5, Ana Vergara1

  • 1Centro de Nanotecnología Aplicada, Facultad de Ciencias, Ingeniería y Tecnología, Universidad Mayor, Camino La Pirámide 5750, 8580745 Huechuraba, Santiago RM Chile.

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概括

作为一种具有成本效益的催化剂,可以在酸性介质中促进演变和氧演变反应,这对于推进质子交换膜 (PEM) 电解剂和绿色生产至关重要.

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科学领域:

  • 电化学和材料科学 材料科学
  • 可再生能源技术可再生能源技术
  • 促进可持续能源的催化剂

背景情况:

  • 对环保能源的需求不断增长,需要替代化石燃料.
  • 使用可再生能源通过水电解生产的是一种关键的可持续能源载体.
  • 质子交换膜 (PEM) 电解器对商业气生产有希望,但依赖于昂贵的贵金属催化剂 (Pt,Ru,Ir).

研究的目的:

  • 审查以为基础的电催化剂在酸性条件下进行水分裂,重点关注它们对PEM电解剂的潜力.
  • 探索的可行性,作为一种更便宜,更丰富的替代品贵金属进化反应 (HER) 和氧进化反应 (OER).

主要方法:

  • 在酸性介质中用于电催化物的基材料的文献综述.
  • 对HER的催化机制,评估方法和性能数据的分析.
  • 在基本条件下检查在化学/光化学水氧化和电催化中的应用.

主要成果:

  • 被认为是酸性介质中HER的有前途的候选物,符合理论预测 (例如,Trasatti火山情节).
  • 有证据表明OER中可能存在,尽管在酸性电催化条件下的研究规模较小.
  • 该审查巩固了关于在水分裂应用中的性能和稳定性的当前知识.

结论:

  • 基于的材料提供了一个潜在的途径,通过取代昂贵的贵金属来降低PEM电解器的成本.
  • 需要进一步的研究,以充分理解和优化的催化活性和在酸性环境中OER的长期稳定性.
  • 对推进绿色生产技术和实现成熟的PEM电解市场具有重大前景.