Large pyroelectric current generation induced by droplet cooling  

作　　者：Wanying Zhang Modi Jiang Yanming Liu Weizheng Cheng Yang Li Kexian Song Peng Tao Chengyi Song Benwei Fu Tao Deng Wen Shang 

机构地区：[1]The State Key Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,800 Dong Chuan Road,Shanghai,200240,PR China [2]Center of Hydrogen Science,Shanghai Jiao Tong University,800 Dong Chuan Road,Shanghai,200240,PR China

出　　处：《Progress in Natural Science:Materials International》2024年第5期888-894,共7页自然科学进展·国际材料(英文版)

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 51521004, 51973109, and 51873105);the Innovation Program of Shanghai Municipal Education Commission(Grant No. 2019-01-07-00-02-E00069)

摘　　要：This paper demonstrates an alternative and simple approach for achieving a fast temperature change on a pyroelectric system through droplet cooling, which leads to enhancement in pyroelectric current generation. The pyroelectric system was composed of a pyroelectric layer of lithium tantalate(LiTaO_(3)) that was sandwiched between two layers of gold/titanium(Au/Ti) as the top and bottom electrodes. Due to both high latent heat and sensible heat of water, there was a rapid heat exchange during the droplet cooling process, and the pyroelectric layer underwent a fast temperature change with the maximum rate of ~725℃/s. The induced pyroelectric current density reached as high as ~8.8 μA/cm^(2). Such pyro-current density is among the highest reported so far.The pyroelectric response was also investigated by using the surfaces with different wettability. The hydrophilic surfaces underwent faster heat dissipation, leading to the generation of larger current than that of the hydrophobic surfaces during the droplet cooling process. This work may help expand the utilization of pyroelectric materials in various applications that involve the current generation using pyroelectric effect.

关 键 词：Energy conversion Pyroelectric systems Temperature change Surface wettability and droplet cooling 

分 类 号：TB34[一般工业技术—材料科学与工程]