Quantum Size Effect to Induce Colossal High‐Temperature Energy Storage Density and Efficiency in Polymer/Inorganic Cluster Composites

• DOI: 10.1002/adma.202301936
• Publication Date: 2023-04-24T20:44:50Z
• Authors: Mingcong Yang; Shaojie Wang; Jing Fu; Yujie Zhu; Jiajie Liang; Sang Cheng; Shixun Hu; Jun Hu; Jinliang He; Qi Li
• Keywords: Polymer nanocomposite; Potential well

Polymer dielectrics need to operate at high temperatures meet the demand of electrostatic energy storage in modern electronic and electrical systems. The polymer nanocomposite approach, an extensively proved strategy for performance improvement, encounters a bottleneck reduced density poor discharge efficiency beyond 150 °C. In this work, polymer/metal oxide cluster composite prepared based on "site isolation" is reported. Capitalizing quantum size effect, bandgap surface defect states ultrasmall inorganic clusters (2.2 nm diameter) are modulated markedly differ from regular-sized nanoparticles. Experimental results conjunction with computational simulation demonstrate that presence can introduce more abundant, deeper traps dielectric respect conventional polymer/nanoparticle blends. Unprecedented high-temperature capacitive performance, including colossal (6.8 J cm-3 ), ultrahigh (95%) superior stability different electric field frequencies, achieved these polymer/cluster composites up 200 Along advantages material preparation (inexpensive precursors one-pot synthesis), such polymer/inorganic approach promising practical power apparatus devices.