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相关概念视频

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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side...
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Combustion Characterization and Model Fuel Development for Micro-tubular Flame-assisted Fuel Cells
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核心/外结构的碳支持提高了燃料电池的耐用性.

Tian-Wei Song1, Jia-Jun Yan1, Lei Tong1

  • 1Hefei National Research Center for Physical Sciences at the Microscale, Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China.

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概括
此摘要是机器生成的。

这项研究引入了一种新型的核心/外碳支持,用于质子交换膜燃料电池中的耐用催化剂,有效抑制降解途径以提高性能.

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Pt颗粒 - - 变粗的电阻碳耐腐蚀性 耐腐蚀性 碳耐腐蚀性核心/外结构的碳支持.耐久性 耐久性 耐久性质子交换膜燃料电池是一种燃料电池.

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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:

  • 质子交换膜燃料电池 (PEMFC) 需要耐用的阴极催化剂来延长运行寿命.
  • 目前的催化剂因碳腐蚀和纳米粒子粗化而面临退化.
  • 现有的耐久性策略通常只针对一种降解途径.

研究的目的:

  • 为正极催化剂开发一种新的核心/外结构碳支.
  • 为了同时抑制碳腐蚀和电催化剂粗化.
  • 为了提高PEMFC阴极催化剂的整体耐用性.

主要方法:

  • 核心/外结构碳支的制造,具有不同的核心和外功能.
  • 核心使用高度石墨化的碳来保证结构完整性.
  • 该外使用异原子合的无形碳来定金纳米颗粒.

主要成果:

  • 设计的催化剂证明了同时抑制碳腐蚀和纳米粒子粗化.
  • 在加速应力测试后,实现了显著低的电化学表面积损失 (13%/3%) 和质量活动损失 (27%/17%).
  • 在高电流密度下显示最小的电压损失 (29 mV/4 mV),超过了美国能源部的目标.

结论:

  • 双功能核心/外碳支持有效地提高了PEMFCs中的催化剂耐用性.
  • 这种方法为克服燃料电池催化剂中关键降解机制提供了一个有希望的策略.
  • 开发的催化剂满足并超过了下一代燃料电池技术的关键耐用性基准.