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Related Concept Videos

The Carnot Cycle01:30

The Carnot Cycle

Converting work to heat is an irreversible process, and the purpose of a heat engine is to reverse the effect partially. Heat engines aim to increase the efficiency of the reversal, that is, maximize the work retrieved from heat. If the efficiency of a heat engine were 100%, it would imply reversing the process completely without introducing any other effect. Thus, it would violate the second law of thermodynamics.
What could be the theoretical limit to the efficiency of a heat engine? The...
The Carnot Cycle and the Second Law of Thermodynamics01:20

The Carnot Cycle and the Second Law of Thermodynamics

The Carnot engine works between two heat reservoirs of fixed temperatures. The Carnot cycle begs the following question: Is it possible to devise a heat engine that is more efficient than a Carnot engine between two fixed temperatures? The answer lies in designing a Carnot refrigerator.
Since the individual steps in a Carnot cycle can be reversed, the entire cycle is, thus, reversible. If a Carnot cycle is reversed, it becomes a Carnot refrigerator. It extracts heat Qc from a cold reservoir at...
Carnot Cycle and Efficiency01:26

Carnot Cycle and Efficiency

The Second Law of Thermodynamics asserts that it's impossible for any heat engine to achieve 100% efficiency. While contemplating the maximum possible efficiency, Nicolas Sadi Carnot conceptualized an ideal heat engine. This engine gets its energy from a high-temperature reservoir. It then performs some work and releases the remaining energy into a low-temperature reservoir.The Carnot cycle, named after Sadi Carnot, is fully reversible. The cycle consists of four distinct stages. In the first...
Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
Thermodynamic Potentials01:26

Thermodynamic Potentials

Thermodynamic potentials are state functions that are extremely useful in analyzing a thermodynamic system. They have dimensions of energy. The four important thermodynamic potentials are internal energy, enthalpy, Helmholtz free energy, and Gibbs free energy. These thermodynamic potentials can be expressed using two of the following variables: pressure, volume, temperature, and entropy. These two variables are expressed as the rate of change of the thermodynamic potential with respect to other...

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Updated: Jun 2, 2026

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
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Published on: February 5, 2020

Entropy engineering for efficient ionic thermoelectric conversion.

Boyang Yu1,2, Zhong Lin Wang1,2,3, Jiangjiang Duan4

  • 1Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, China.

National Science Review
|June 1, 2026
PubMed
Summary
This summary is machine-generated.

Entropy engineering in thermogalvanic devices is crucial for efficient waste-heat harvesting and cooling. This approach presents new opportunities and challenges for optimizing ionic thermoelectric energy conversion.

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Area of Science:

  • Materials Science
  • Energy Conversion
  • Thermoelectrics

Background:

  • Thermogalvanic technologies are a subset of ionic thermoelectrics.
  • These devices offer potential for waste-heat harvesting and cooling applications.
  • Achieving high energy conversion efficiency is a key goal.

Purpose of the Study:

  • To explore the role of entropy engineering in thermogalvanic devices.
  • To understand the challenges and opportunities associated with entropy engineering.
  • To advance the efficiency of ionic thermoelectric energy conversion.

Main Methods:

  • Investigated entropy engineering principles.
  • Analyzed the impact of entropy on thermogalvanic performance.
  • Evaluated energy conversion efficiency metrics.

Main Results:

  • Entropy engineering significantly influences thermogalvanic device performance.
  • Identified specific strategies for optimizing entropy.
  • Demonstrated potential for enhanced waste-heat harvesting and cooling.

Conclusions:

  • Entropy engineering is a critical factor for high-efficiency thermogalvanic energy conversion.
  • Further research into entropy engineering will unlock new opportunities in ionic thermoelectrics.
  • Thermogalvanic technologies show significant promise for sustainable energy solutions.