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相关概念视频

Relative Strengths of Conjugate Acid-Base Pairs02:29

Relative Strengths of Conjugate Acid-Base Pairs

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Brønsted-Lowry acid-base chemistry is the transfer of protons; thus, logic suggests a relation between the relative strengths of conjugate acid-base pairs. The strength of an acid or base is quantified in its ionization constant, Ka or Kb, which represents the extent of the acid or base ionization reaction. For the conjugate acid-base pair HA / A−, the ionization equilibrium equations and ionization constant expressions are
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Polymers02:34

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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A schema is a mental framework that helps individuals organize and interpret information. Schemata, formed from previous experiences, influence how we process new information: how we encode it, the inferences we make, and how we retrieve it. For instance, a schema for what a typical classroom looks like might include desks, a teacher's desk, a whiteboard, and students in such an environment. This expectation helps us quickly understand and navigate new classrooms without needing to analyze...
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Conjugated Proteins02:50

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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
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基氨酸结合的微孔聚合物作为存的有希望的阳极.

Wanli Ma1, Xiaoyu Song2, Xiao Li1

  • 1School of Chemistry and Chemical Engineering, Ludong University, Yantai 264025, China.

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基于氨酸的工程结合微孔聚合物 (CMP) 为离子电池 (LIB) 提供了解决方案. 这些新型CMP实现了高容量,快速充电和长期稳定性,克服了关键的电池材料挑战.

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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
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 结合微孔聚合物 (CMP) 是离子电池 (LIB) 的电极材料,因为它们的稳定性和可调结构.
  • 在LIBs的CMP中同时优化容量,利率性能和循环稳定性仍然是一个重大挑战.

研究的目的:

  • 设计和合成一种基于氨酸的新型CMP (NiP-CMP) 与集成的电化学活性站点.
  • 通过使用工程NiP-CMP. 在LIBs中同时优化容量,速率性能和循环稳定性.

主要方法:

  • 基于氨酸的CMP (NiP-CMP) 的合理设计,包括金属-N4宏循环和结合基因链接.
  • 微调多重凝结条件以达到高特异面积 (1110 m2 g-1).
  • 作为LIBs的电极材料的NiP-CMP的电化学表征.

主要成果:

  • 合成的NiP-CMP具有较高的特定表面积,促进了有效的离子扩散和电荷传输.
  • NiP-CMP在0.1 A g-1.1下提供高特异容量~702 mA h g−1的高特异容量.
  • 该材料表现出极好的速率能力 (355 mA h g-1 在 1 A g-1 时) 和长期循环稳定性.

结论:

  • 理性设计的NiP-CMP有效地解决了电极材料"三难题"的容量,动力学和耐用性.
  • 这项工作为先进的储能应用中高性能有机电极材料提供了可行的设计策略.