Giant electrocaloric and energy storage performance of [(K0.5Na0.5)NbO3](1−x)-[LiSbO3] x nanocrystalline ceramics

Abstract

Electrocaloric (EC) refrigeration, an EC effect based technology has been accepted as an auspicious way in the development of next generation refrigeration due to high efficiency and compact size. Here, we report the results of our experimental investigations on electrocaloric response and electrical energy storage properties in lead-free nanocrystalline (1 − x)K0.5Na0.5NbO3-xLiSbO3 (KNN-xLS) ceramics in the range of 0.015 ≤ x ≤ 0.06 by the indirect EC measurements. Doping of LiSbO3 has lowered both the transitions (TC and TO–T) of KNN to the room temperature side effectively. A maximal value of EC temperature change, ΔT = 3.33 K was obtained for the composition with x = 0.03 at 345 K under an external electric field of 40 kV/cm. The higher value of EC responsivity, ζ = 8.32 × 10−7 K.m/V is found with COP of 8.14 and recoverable energy storage of 0.128 J/cm3 with 46% efficiency for the composition of x = 0.03. Our investigations show that this material is a very promising candidate for electrocaloric refrigeration and energy storage near room temperature.

Thermal-stability of the enhanced piezoelectric, energy storage and electrocaloric properties of a lead-free BCZT ceramic

“…The obtained value is comparable to some previous works of Pb-free 63–67 and Pb-based 61,68–72 materials. For example, Kumar et al 65 presented that 0.97K 0.5 Na 0.5 NbO 3 –0.03LiSbO 3 nanocrystalline ceramic demonstrated a COP value of 8.14 under an electric field of 40 kV cm −1 . Peng et al 70 obtained a COP value of 3.37 in Nb-doped Pb 0.99 (Zr 0.65 Sn 0.3 Ti 0.05 ) 0.98 O 3 antiferroelectric thin film by using a sol–gel route.…”

Analogous Anti-Ferroelectricity in Y2O3-Coated (Pb0.92Sr0.05La0.02)(Zr0.7Sn0.25Ti0.05)O3 Ceramics and Their Energy-Storage Performance

“…Figure 3b shows energy-storage performance of some lead-based and lead-free ferroelectrics and antiferroelectrics [17,19,20,21,22,23,24,25,26]. Considering the electric field used in this work, the energy-storage density of the 0.25 mol% Y 2 O 3 -doped PSLZSnT ceramics is far larger than these materials, and the energy-storage efficiency exceeds most of these materials.…”

“…( a ) Variation of energy-storage density and energy-storage efficiency as a function of electric field of the 0.25 mol% Y 2 O 3 -doped PSLZSnT ceramics; ( b ) comparison of energy-storage performance of some recently reported ferroelectric and antiferroelectric ceramics, in which BCeT is BaCe 0.15 Ti 0.85 O 3 [20]; NBT-ST is 0.7(Na 0.5 Bi 0.5 )TiO 3 -0.3SrTiO 3 [21]; KNaN-LS is 0.97(K 0.5 Na 0.5 )NbO 3 -0.03LiSbO 3 [22]; BT-BiZnZr is 0.9BaTiO 3 -0.1Bi(Zn 0.5 Zr 0.5 )O 3 [23]; BiNBT-KN is 0.94Bi 0.47 Na 0.47 Ba 0.06 TiO 3 -0.06KNbO 3 [24]; BNT-BKT-BA is 0.94(0.75Bi 0.5 Na 0.5 TiO 3 -0.25Bi 0.5 K 0.5 TiO 3 )-0.06BiAlO 3 [25]; PYbN-PZT is 0.075Pb(Yb 1/2 Nb 1/2 )O 3 -0.925Pb(Zr 0.36 Ti 0.64 )O 3 [17]; PLT is (Pb 1-x La x )Ti 1-x/4 O 3 (x = 0.28) [26]; and PLZST is Pb 0.94 La 0.04 [(Zr 0.7 Sn 0.3 ) 0.9 Ti 0.1 ]O 3 [19]. …”

Photoelectrocaloric effect in ferroelectric oxide

“…To investigate the EC response in the BBLT sample, the indirect method is adopted. To obtain the EC parameters, the temperature-dependent polarization data are extracted from two different approaches; Method (I): polarization ( P ) versus electric field ( E ) and Method II: pyroelectric current measurements 4 , 7 , 10 , 26 , 27 . For this purpose, temperature-dependent P – E measurement from 300 to 380 K recorded on the sample at 4 Hz is shown in Fig.…”

“…To extract the EC characteristic parameter, the isothermal entropy change (Δ S ) and adiabatic temperature change (Δ T ), the respective thermodynamic Maxwell’s equations , and are used 4 . The EC characteristic parameters can be expressed as , and 26 , 27 .…”