发表机构
Multifunctional Materials & Composites (MMC) Laboratory, Department of Engineering Science, University of Oxford, United Kingdom（牛津大学工程科学系多功能材料与复合材料实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究突破多孔MOF用于TENG的常规思路，采用致密ZIF-zni作为PU基体填料，制备出高稳定性摩擦地砖，为机械能采集器设计提供新策略。
AI 中文摘要
目前，结合金属有机框架（MOFs）的摩擦纳米发电机（TENGs）大多围绕多孔结构设计，其假设是高内表面积是摩擦电增强的主要驱动因素。本文中，我们证明一种名为ZIF-zni的致密、名义上非多孔MOF可作为摩擦正性聚氨酯（PU）基体中高效高负载填料，为利用界面机电效应提供了设计策略。20 wt% ZIF-zni@PU复合材料与聚二甲基硅氧烷（PDMS）配对时，输出电压达470±15 V，峰值功率密度为1.31±0.03 W m⁻²。该器件在约100 N接触力下经受约94000次循环后性能仍稳定，在超过500 N的更高冲击下仍可运行。该概念成功制备了原理验证型摩擦地砖。结合实验与理论研究表明，性能提升源于有利的界面极化、降低的介电屏蔽以及表面可及的ZIF-zni富集区域，而非仅孔隙率；这些特性伴随粘附功降低和表面粗糙度改变，从而改善接触起电。这些发现确立了致密MOFs作为有效摩擦电填料的地位，并确定界面电子结构和极化是机械能采集器与自供电传感器工程的关键设计参数。
英文摘要
Triboelectric nanogenerators (TENGs) incorporating metal-organic frameworks (MOFs) have largely been designed around porous architectures, based on the assumption that high internal surface area is the primary driver for triboelectric enhancement. Herein, we demonstrate that a dense, nominally nonporous MOF called ZIF-zni can instead function as an effective high-loading filler within a tribopositive polyurethane (PU) matrix, offering a design strategy for harnessing interfacial electromechanical effects. A 20 wt% ZIF-zni@PU composite delivers an output voltage of 470+/-15 V and a peak power density of 1.31+/-0.03 W m-2 against polydimethylsiloxane (PDMS). The device exhibits stable performance over ~94,000 cycles under a contact force of ~100 N, and it remains operational under higher impact beyond 500 N. This concept enables the demonstration of a proof-of-concept triboelectric floor tile. Combined experimental and theoretical studies indicate that the performance enhancement arises from favourable interfacial polarization, reduced dielectric screening, and surface accessible ZIF-zni rich domains, rather than porosity alone. These features are accompanied by reduced work of adhesion and modified surface roughness, hence improving contact electrification. These findings establish dense MOFs as an effective triboelectric filler and identify interfacial electronic structure and polarization as key design parameters for engineering mechanical energy harvesters and self-powered sensors.
Comments30 pages, 6 figures, supporting information
