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A cascade electrocaloric cooling device for large temperature lift


Cooling technology that is both compact and flexible is increasingly vital for the thermal management of wearable electronics and personal comfort. Electrocaloric (EC) cooling provides a potential solution, but the low adiabatic temperature change of EC materials has been the bottleneck in its progress. We demonstrate a cascade EC cooling device that increases the temperature change, with enhanced cooling power and cooling efficiency at the same time. The device integrates multiple units of EC polymer elements and an electrostatic actuation mechanism, all operating in synergy. Every two adjacent EC elements function in antiphase (in terms of both actuation and EC effect) to allow heat flow to be continuously relayed from the heat source to the heat sink. The antiphase operation also enables internal charge recycling, which enhances the energy efficiency. Operating at the EC electric field at which the adiabatic temperature change of the material is 3.0 K, a four-layer cascade device achieves a maximum temperature lift of 8.7 K under no-load conditions. The coefficient of performance is estimated to be 9.0 at the temperature lift of 2.7 K and 10.4 at zero temperature lift.

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Fig. 1: A solid-state, cascade-structured EC cooling device.
Fig. 2: Operational mechanism of a four-layer, cascade-structured cooling device.
Fig. 3: Cooling performance of the cascade device.
Fig. 4: Temperature span and cooling effectiveness of the cascade cooling device.

Data availability

All data generated or analysed during this study are included in the published article and its Supplementary Information.


  1. 1.

    Jacobs, S. et al. The performance of a large-scale rotary magnetic refrigerator. Int. J. Refrig. 37, 84–91 (2014).

    Article  Google Scholar 

  2. 2.

    Lozano, J. A. et al. Performance analysis of a rotary active magnetic refrigerator. Appl. Energy 111, 669–680 (2013).

    Article  Google Scholar 

  3. 3.

    Tura, A. & Rowe, A. Permanent magnet magnetic refrigerator design and experimental characterization. Int. J. Refrig. 34, 628–639 (2011).

    Article  Google Scholar 

  4. 4.

    Nair, B. et al. Large electrocaloric effects in oxide multilayer capacitors over a wide temperature range. Nature 575, 468–472 (2019).

    Article  Google Scholar 

  5. 5.

    Qian, J. F. et al. Interfacial coupling boosts giant electrocaloric effects in relaxor polymer nanocomposites: in situ characterization and phase-field simulation. Adv. Mater. 31, 1801949 (2019).

    Google Scholar 

  6. 6.

    Zhang, G. Z. et al. Colossal room-temperature electrocaloric effect in ferroelectric polymer nanocomposites using nanostructured barium strontium titanates. ACS Nano 9, 7164–7174 (2015).

    Article  Google Scholar 

  7. 7.

    Neese, B. et al. Large electrocaloric effect in ferroelectric polymers near room temperature. Science 321, 821–823 (2008).

    Article  Google Scholar 

  8. 8.

    Mischenko, A. S., Zhang, Q., Scott, J. F., Whatmore, R. W. & Mathur, N. D. Giant electrocaloric effect in thin-film PbZr0.95Ti0.05O3. Science 311, 1270–1271 (2006).

    Article  Google Scholar 

  9. 9.

    Zhang, Q. M., Bharti, V. & Zhao, X. Giant electrostriction and relaxor ferroelectric behavior in electron-irradiated poly(vinylidene fluoride-trifluoroethylene) copolymer. Science 280, 2101–2104 (1998).

    Article  Google Scholar 

  10. 10.

    Kabirifar, P. et al. Elastocaloric cooling: state-of-the-art and future challenges in designing regenerative elastocaloric devices. Stroj. Vestn. J. Mech. Eng. 65, 615–630 (2019).

    Article  Google Scholar 

  11. 11.

    Li, B. et al. Colossal barocaloric effects in plastic crystals. Nature 567, 506–510 (2019).

    Article  Google Scholar 

  12. 12.

    Lloveras, P. et al. Colossal barocaloric effects near room temperature in plastic crystals of neopentylglycol. Nat. Commun. 10, 1803 (2019).

    Article  Google Scholar 

  13. 13.

    Tusek, J. et al. A regenerative elastocaloric heat pump. Nat. Energy 1, 16134 (2016).

    Article  Google Scholar 

  14. 14.

    Shi, J. Y. et al. Electrocaloric cooling materials and devices for zero-global-warming-potential, high-efficiency refrigeration. Joule 3, 1200–1225 (2019).

    Article  Google Scholar 

  15. 15.

    Ozbolt, M., Kitanovski, A., Tusek, J. & Poredos, A. Electrocaloric refrigeration: thermodynamics, state of the art and future perspectives. Int. J. Refrig. 40, 174–188 (2014).

    Article  Google Scholar 

  16. 16.

    Chen, X. et al. Towards electrocaloric heat pump–a relaxor ferroelectric polymer exhibiting large electrocaloric response at low electric field. Appl. Phys. Lett. 113, 113902 (2018).

    Article  Google Scholar 

  17. 17.

    Li, X. Y. et al. Tunable temperature dependence of electrocaloric effect in ferroelectric relaxor poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene terpolymer. Appl. Phys. Lett. 99, 052907 (2011).

  18. 18.

    Zhang, X. & Zhao, L. D. Thermoelectric materials: energy conversion between heat and electricity. J. Materiomics 1, 92–105 (2015).

    Article  Google Scholar 

  19. 19.

    Jia, Y. B. & Sungtaek, Y. A solid-state refrigerator based on the electrocaloric effect. Appl. Phys. Lett. 100, 242901 (2012).

    Article  Google Scholar 

  20. 20.

    Gu, H. M. et al. A chip scale electrocaloric effect based cooling device. Appl. Phys. Lett. 102, 122904 (2013).

    Article  Google Scholar 

  21. 21.

    Gu, H. M., Qian, X. S., Ye, H. J. & Zhang, Q. M. An electrocaloric refrigerator without external regenerator. Appl. Phys. Lett. 105, 162905 (2014).

    Article  Google Scholar 

  22. 22.

    Sinyavsky, Y. V. & Brodyansky, V. M. Experimental testing of electrocaloric cooling with transparent ferroelectric ceramic as a working body. Ferroelectrics 131, 321–325 (1992).

    Article  Google Scholar 

  23. 23.

    Plaznik, U. et al. Bulk relaxor ferroelectric ceramics as a working body for an electrocaloric cooling device. Appl. Phys. Lett. 106, 043903 (2015).

    Article  Google Scholar 

  24. 24.

    Ma, R. J. et al. Highly efficient electrocaloric cooling with electrostatic actuation. Science 357, 1130–1134 (2017).

    Article  Google Scholar 

  25. 25.

    Kitanovski, A. Energy applications of magnetocaloric materials. Adv. Energy Mater. 10, 1903741 (2020).

    Article  Google Scholar 

  26. 26.

    Snodgrass, R. & Erickson, D. A multistage elastocaloric refrigerator and heat pump with 28 K temperature span. Sci. Rep. 9, 18532 (2019).

    Article  Google Scholar 

  27. 27.

    Gu, H. M. et al. Simulation of chip-size electrocaloric refrigerator with high cooling-power density. Appl. Phys. Lett. 102, 112901 (2013).

    Article  Google Scholar 

  28. 28.

    Zhang, T., Qian, X. S., Gu, H. M., Hou, Y. & Zhang, Q. M. An electrocaloric refrigerator with direct solid to solid regeneration. Appl. Phys. Lett. 110, 243503 (2017).

    Article  Google Scholar 

  29. 29.

    Basiulis, A. & Berry, R. L. Solid-state electrocaloric cooling system and method. US patent 4,757,688 (1988).

  30. 30.

    Mathur, N. & Mishchenko, A. Solid state electrocaloric cooling devices and methods. GB patent PCT/GB2005/050207 (2005).

  31. 31.

    Bradesko, A. et al. Coupling of the electrocaloric and electromechanical effects for solid-state refrigeration. Appl. Phys. Lett. 109, 143508 (2016).

    Article  Google Scholar 

  32. 32.

    Pelrine, R., Kornbluh, R., Pei, Q. B. & Joseph, J. High-speed electrically actuated elastomers with strain greater than 100%. Science 287, 836–839 (2000).

    Article  Google Scholar 

  33. 33.

    Defay, E. et al. Enhanced electrocaloric efficiency via energy recovery. Nat. Commun. 9, 1827 (2018).

    Article  Google Scholar 

  34. 34.

    Campolo, D., Sitti, M. & Fearing, R. S. Efficient charge recovery method for driving piezoelectric actuators with quasi-square waves. IEEE Trans. Ultrason. Ferroelectr. Freq. Control 50, 237–244 (2003).

    Article  Google Scholar 

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This work was supported by the Office of Naval Research (award no. N00014-19-1-2212).

Author information




Y.M., Z.Z. and Q.P. conceived and designed the experiments. Y.M. and J.W. prepared EC polymer stacks. Y.M. and H. Wu designed the charge transfer circuit. R.W. built the charge transfer circuit. Y.M. and H. Wang fabricated the devices and performed the measurements. Y.M., Z.Z. and Q.P. analysed and interpreted the data. Y.M. simulated the cascade device performance. Y.M. and Q.P. organized the data and wrote the manuscript, and all authors reviewed and commented on the manuscript.

Corresponding author

Correspondence to Qibing Pei.

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Competing interests

The authors declare no competing interests.

Additional information

Peer review information Nature Energy thanks Brahim Dkhil, Neil Mathur and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.

Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Supplementary information

Supplementary Information

Supplementary Figs, 1–7, Notes 1–5, Table 1 and refs. 1–5.

Supplementary Video

Video showing successively a unit device actuating at 1.0 Hz, a two-layer cascade device at 2.0 Hz, and a four-layer cascade device at 4.0 Hz. In addition to the electrostatic actuation field applied, all devices are biased with 60 MV m−1 electrocaloric field.

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Meng, Y., Zhang, Z., Wu, H. et al. A cascade electrocaloric cooling device for large temperature lift. Nat Energy 5, 996–1002 (2020).

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