Solid-state electrocaloric cooling devices move closer to practical refrigeration
image: Graphical abstract. This figure summarizes the electrocaloric cooling device system, including its structure, thermodynamic cycle (entropy vs. temperature under applied/zero field), performance measurement platform with adjustable heat sink–source distance, and target applications such as localized and concentrated cooling.
Credit: Donglin Han, Yifan Zhao, Xiaoshi Qian*. This is an Open Access article licensed under a Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, sharing, adaptation, distribution and reproduction in any medium or format, for any purpose, even commercially, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Researchers have reviewed recent advances in electrocaloric (EC) cooling devices, highlighting their potential as compact, energy-efficient alternatives to conventional refrigeration technologies. The study, published in the open-access journal Thermo-X, summarizes the latest developments in device architectures, thermodynamic cycles, and performance evaluation methods for electrocaloric cooling systems.
Unlike traditional refrigeration systems that rely on vapor-compression cycles and chemical refrigerants, electrocaloric cooling is based on a solid-state thermodynamic effect in which certain dielectric materials change temperature when an electric field is applied or removed. By cyclically applying and releasing the electric field, these materials can absorb heat from one region and release it to another, enabling a refrigeration process without gaseous refrigerants or complex mechanical components.
Over the past two decades, rapid progress in electrocaloric materials and device engineering has significantly improved the performance of EC cooling systems. Researchers have developed several device concepts that enhance heat transfer and amplify temperature differences within the system. These advances have enabled electrocaloric devices to achieve increasingly larger temperature spans and cooling capacities, bringing the technology closer to practical applications.
The review also emphasizes the importance of standardized testing methods for evaluating electrocaloric cooling performance. Metrics such as cooling power, cooling power density, and coefficient of performance (COP) are essential for comparing different device designs. In particular, the authors highlight the use of enthalpy-difference measurement platforms, which allow more accurate evaluation of device performance under controlled conditions.
Despite the progress achieved so far, several challenges remain before electrocaloric refrigeration can be widely deployed. Improving heat transfer efficiency, managing the high electric fields required for strong electrocaloric responses, and developing scalable device architectures will be important areas of future research.
As electronic devices become increasingly powerful and compact, efficient thermal management is becoming more critical than ever. Electrocaloric cooling offers a promising pathway toward environmentally friendly, solid-state refrigeration technologies that could support applications ranging from electronics cooling to next-generation energy-efficient refrigeration systems.