Two dimensional confinement induced discontinuous chain transitions for augmented electrocaloric cooling

作者：Fang Wang, Zhong-Ye Wang, Yaorong Luo, Ming‐Ding Li, Yurong Yang, Wei Li, Xiaoliang Wang, Tiannan Yang, Qun‐Dong Shen · 发表于：Nature Communications · 年份：2025 · DOI：10.1038/s41467-024-55726-5 · 被引用次数：11 · 研究领域：Advanced Sensor and Energy Harvesting Materials、Dielectric materials and actuators、Ferroelectric and Piezoelectric Materials

Overheating remains a major barrier to chip miniaturization, leading to device malfunction. Addressing the urgent need for thermal management promotes the development of solid-state electrocaloric cooling. However, enhancing passive heat dissipation through two-dimensional materials in electrocaloric polymers typically compromises the electrocaloric effect. In this work, we utilize two-dimensional polyamide with porous structure and hydrogen bonding to achieve multiple polar conformations with short-range order in the electrocaloric composite polymers. The structure minimizes intermolecular interactions while reducing energy barriers for field-driven polar-nonpolar conformational transitions. The electrocaloric polymer exhibits doubled cooling efficiency at electric fields as low as 40 MV m−1. Additionally, the electrode design achieves a vertical deformation of 2 millimeters, demonstrating the feasibility of self-driven electric refrigeration devices. This porous organic two-dimensional material resolves cooling efficiency limitations from spatial confinement, advancing the integration of two-dimensional materials in flexible electronics. Solid-state cooling technology based on electrocaloric materials shows promising potential for addressing electronic overheating challenges. Here, the authors employ two-dimensional polyamide to enhance the electrocaloric cooling performance by reducing intermolecular interactions and facilitating electrocaloric phase transitions thereby, o...