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Related Concept Videos

Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

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An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
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Updated: Jul 1, 2026

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
09:09

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Published on: February 5, 2020

Engineering asymmetric solvation structures for synergistically boosted quasi-solid thermocells.

Wentao Lin1, Shuo Niu1, Shukai Wu1

  • 1Sustainable Energy and Environment Thrust, The Hong Kong University of Science and Technology (Guangzhou) Guangzhou Guangdong 511400 China chaofang@hkust-gz.edu.cn.

Chemical Science
|June 30, 2026
PubMed
Summary

Researchers developed hybrid hydrogel electrolytes using a co-solvent strategy to improve quasi solid-state thermocells (QTECs). This enhances low-grade heat conversion into electricity by optimizing ion solvation and transport.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • Quasi solid-state thermocells (QTECs) convert low-grade heat to electricity via the thermogalvanic effect.
  • Single-solvent hydrogel electrolytes offer limited improvements in thermopower due to marginal solvation entropy and poor ion transport.

Purpose of the Study:

  • To overcome the limitations of single-solvent hydrogels in QTECs.
  • To develop a novel co-solvent strategy for enhanced thermoelectrochemical performance.

Main Methods:

  • Constructed hybrid hydrogel electrolytes using trimethyl phosphate and ethylene glycol as co-solvents.
  • Employed advanced characterization techniques and molecular simulations.
  • Investigated the impact of co-solvents on solvation entropy, ion transport, and thermopower.

Main Results:

  • The co-solvent strategy synergistically enhanced solvation entropy differences and ion transport.
  • Achieved superior thermoelectrochemical performance, enabling efficient low-grade heat harvesting, even at sub-zero temperatures.
  • Elucidated the role of co-solvent engineered asymmetric solvation structures in performance enhancement.

Conclusions:

  • Additive-free modulation of the solvation environment in thermogalvanic hydrogels is a practical strategy.
  • The developed hybrid hydrogel electrolytes significantly enhance QTEC performance for efficient heat energy harvesting.