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Videos de Conceptos Relacionados

Introduction to Chemical Reactions01:23

Introduction to Chemical Reactions

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All chemical reactions begin with a reactant, the general term for one or more substances entering the reaction. Sodium and chloride ions, for example, are the reactants in the production of table salt. One or more substances produced by a chemical reaction are called the product. Chemical reactions follow the law of conservation of mass, which means that matter cannot be created nor destroyed in a chemical reaction. The components of the reactants—the number of atoms and the...
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Reaction Mechanisms03:06

Reaction Mechanisms

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Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
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Predicting Reaction Outcomes02:24

Predicting Reaction Outcomes

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Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
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Reversible and Irreversible Processes01:14

Reversible and Irreversible Processes

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The thermodynamic processes can be classified into reversible and irreversible processes. The processes that can be restored to their initial state are called reversible processes. It is only possible if the process is in quasi-static equilibrium, i.e., it takes place in infinitesimally small steps, and the system remains at equilibrium However, these are ideal processes and do not occur naturally. An ideal system undergoing a reversible process is always in thermodynamic equilibrium within...
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Temperature Dependence on Reaction Rate02:55

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The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
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Chemical Reactions01:19

Chemical Reactions

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A chemical reaction is a process by which the bonds in the atoms of substances are rearranged to generate new substances. Matter cannot be created or destroyed in a chemical reaction—the same type and number of atoms that make up the reactants are still present in the products. Merely, the rearrangement of chemical bonds produces new compounds.
Chemical Reactions Rearrange Atoms into New Substances
A chemical reaction takes starting materials—the reactants—and changes them...
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Trabajo a temperatura ambiente

Dejian Dong1, Yi-Chun Lu1

  • 1Electrochemical Energy and Interfaces Laboratory, Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China.

Science (New York, N.Y.)
|February 2, 2023
PubMed
Resumen
Este resumen es generado por máquina.

Un nuevo electrolito de estado sólido permite que las baterías de litio-aire funcionen a temperatura ambiente (25 °C). Este avance avanza en el desarrollo de soluciones de almacenamiento de energía eficientes y estables.

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Área de la Ciencia:

  • Ciencias de los materiales
  • La electroquímica
  • Almacenamiento de energía

Sus antecedentes:

  • Las baterías de litio-aire ofrecen una alta densidad de energía teórica.
  • Las baterías de litio-aire convencionales requieren temperaturas elevadas o condiciones de humedad.
  • Los electrolitos de estado sólido son cruciales para la seguridad y la estabilidad de la batería.

Objetivo del estudio:

  • Desarrollar un electrolito de estado sólido para el funcionamiento de la batería de litio-aire a temperatura ambiente.
  • Para demostrar la viabilidad del funcionamiento a temperatura ambiente de las baterías de litio-aire.

Principales métodos:

  • Síntesis y caracterización de un nuevo material de electrolito en estado sólido.
  • Montaje y ensayo de una batería de litio-aire utilizando el electrolito desarrollado.
  • Evaluación del rendimiento electroquímico a 25°C.

Principales resultados:

  • El electrolito de estado sólido permitió el funcionamiento estable de la batería de litio-aire a 25 °C.
  • La batería demostró un prometedor rendimiento de ciclo y eficiencia coulombina a temperatura ambiente.

Conclusiones:

  • Los electrolitos de estado sólido pueden facilitar el funcionamiento práctico a temperatura ambiente de las baterías de litio-aire.
  • Este trabajo allana el camino para la próxima generación de baterías de alto rendimiento.