A review of gelled electrolyte thermoelectrochemical cells: valorising low-grade heat to electricity via continuous and capacitive conversion mechanisms

IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY
Mark A. Buckingham
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引用次数: 0

Abstract

Thermoelectrochemical cells (also known as thermogalvanic cells or thermocells) are electrochemical devices that convert thermal energy to electrical energy via entropically driven redox reactions. These devices have gained increasing attention this century as they have the possibility of valorising otherwise wasted (heat) energy to useful (electrical) energy with no moving parts, no greenhouse gas emissions, and using sustainably sourced elements such as iron (Fe). Liquid thermocells suffer from several issues including electrolyte leakage, lower ‘observed’ temperature gradients than those applied and poor mechanical properties. Towards applications such as body heat harvesting — where thermal energy sources are dynamic — these disadvantages can become significant. Gelled electrolyte thermocells have been developed as these are self-contained systems that achieve higher temperature gradients across the thermocell and have mechanical properties that allow the ability to stretch, bend, and twist. This makes gelled thermocells compatible with many of the proposed applications of these devices. However, compared to liquid electrolyte thermocells, gelled electrolyte thermocells typically achieve significantly lower performance, mainly due to frustrated ion transport in the denser matrix, reducing the generation of current, which also leads to reductions in power output over time. This review provides an overview of the current state of gelled electrolyte thermocells and compares them to their liquid counterparts.

凝胶电解质热电化学电池的研究进展:通过连续和电容转换机制将低品位的热转化为电
热电化学电池(也称为热电电池或热电池)是通过熵驱动的氧化还原反应将热能转化为电能的电化学装置。这些设备在本世纪受到了越来越多的关注,因为它们有可能将原本浪费的(热)能量转化为有用的(电)能量,没有活动部件,没有温室气体排放,并且使用可持续来源的元素,如铁(Fe)。液体热电池存在几个问题,包括电解质泄漏、“观察到”的温度梯度低于实际应用的温度梯度以及机械性能差。对于诸如体热收集之类的应用——其中热能来源是动态的——这些缺点可能变得明显。凝胶电解质热电池已经被开发出来,因为这些是独立的系统,可以在热电池上实现更高的温度梯度,并且具有拉伸、弯曲和扭曲的机械性能。这使得凝胶热电池与这些设备的许多拟议应用兼容。然而,与液体电解质热电池相比,凝胶电解质热电池的性能通常要低得多,这主要是由于在密度更大的基质中离子传输受阻,减少了电流的产生,这也导致功率输出随着时间的推移而降低。本文综述了凝胶电解质热电池的现状,并将其与液体热电池进行了比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.80
自引率
4.00%
发文量
227
审稿时长
4.1 months
期刊介绍: The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.
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