ABSTRACT The global energy transition demands efficient, zero‐carbon cooling. The electrocaloric effect (ECE) is a promising solid‐state thermal management technology due to its zero emissions and high efficiency. Its advancement hinges on materials that generate large entropy changes under electric fields. However, conventional material design struggles to achieve both a giant entropy change and a broad operating temperature range simultaneously. This study proposes a novel multi‐scale heterogeneous entropy engineering strategy, utilizing pre‐synthesized high‐configurational entropy components as structural units to construct a heterogeneous architecture with a three‐dimensional interpenetrating network. Experimental results demonstrate that this design successfully achieves extreme cross‐scale regulation of polar entropy. Compared to samples prepared via conventional solid‐state synthesis, this strategy exhibits an excellent performance balance, achieving a 29% enhancement in the adiabatic temperature change (Δ T ) and a 27% improvement in isothermal entropy change (Δ S ) at the cost of only a 5% reduction in the operating temperature span ( T span ). This work realizes an outstanding balance in the comprehensive performance metric Δ T · T span through multi‐scale heterogeneous structure design, offering a new paradigm for high‐performance electrocaloric materials.
Li et al. (Fri,) studied this question.