期刊
NANO ENERGY
卷 47, 期 -, 页码 285-293出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2018.03.003
关键词
Electrocaloric; Antiferroelectric; Relaxor; Thin film; Sol-gel
类别
资金
- Research Grants Council of the Hong Kong Special Administrative Region, China [PolyU152665/16E]
- National Natural Science Foundation of China [51402196]
- Guangxi Science Foundation [2016GXNSFCB380006, 2017GXNSFFA198015]
- Scientific Research Foundation of Guangxi University [XTZ160530]
Ferroelectric/antiferroelectric thin/thick films with large electrocaloric (EC) effect in a broad operational temperature range are very attractive in solid-state cooling devices. We demonstrated that a large positive electrocaloric (EC) effect (maximum Delta T similar to 20.7 K) in a broad temperature range (similar to 110 K) was realized in Pb0.97La0.02(Zr0.65Sn0.3Ti0.05)O-3 (PLZST) relaxor antiferroelectric (AFE) thin film prepared using a sol-gel method. The large positive EC effect may be ascribed to the in-plane residual thermal tensile stress during the layer-by-layer annealing process, and the high-quality film structure owing to the utilization of the LaNiO3/Pt composite bottom electrode. The broad EC temperature range may be ascribed to the great dielectric relaxor dispersion around the dielectric peak because of the coexistence of nanoscale multiple FE and AFE phases. Moreover, a large pyroelectric energy density (6.10 Jcm(-3)) was harvested by using an Olsen cycle, which is much larger than those (usually less than 10(-) Jcm(-3)) obtained by using direct thermal-electrical, Stirling and Carnot cycles, etc. These breakthroughs enable the PLZST thin film an attractive multifunctional material for applications in modern solid-state cooling and energy harvesting.
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