1.Introduction
Refrigeration plays an essential role in nowadays society.How-ever,conventional refrigeration based on vapor compression cool-ing shows high energy consumption,complicated structure and even environmental pollution.Searching for an environmental-friendly and energy-saving refrigeration technology has become a matter of concern[1,2].In the past few decades,the solid-state re-frigeration technologies mainly represented by magnetocaloric ef-fect (MCE),electrocaloric effect (ECE) and elastocaloric effect (eCE)have been regarded as promising candidate to replace traditional vapor compression refrigeration technology owing to environmen-tal friendliness and high efficiency[1-9].