Triboelectric generators (TEGs) stemming from the triboelectric phenomena, are promising for energy harvesting due to their high output power and efficiency. Analysis of the tribo material selection for TEGs has suggested that energy generation is linked to heterogeneous and homogeneous materials found at opposite ends of the triboelectric series. Current research has identified that the triboelectric phenomenon also exists from contact between identical tribo materials with the advancement of surface modification. However, a comparison of composite and identical homogeneous TEGs has yet to be reported. For this research, organic polymer membranes Polyamide-6 (PA6) and Polytetrafluoroethylene (PTFE) were evaluated. The membranes were cut into samples of varying dimensions to build three sets of TEGs for comparison. Two identical sets of four sampled TEGs were fabricated using the same membrane (i.e., PA6-PA6 and PTFE-PTFE); in contrast to a composite set of four sampled TEGs made from the two distinct membranes (i.e., PA6-PTFE). By repeatedly sampling the TEGs in sliding mode at a speed of 0.2 m/s and with a vertical force of 9.8 N an open circuit voltage (V_oc) was generated and recorded. As a result, the V_oc of the identical TEGs was compared to the V_oc of the composite TEG in which the tribo materials are located at opposite ends of the triboelectric series. It was also observed that the V_oc increased almost linear in relation to the surface area of the TEGs; thus, suggesting that the surface area of the TEG can influence significantly the V_oc to a great extent.

Graphical abstract

中文翻译：

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摩擦发电机相关带电材料接触面积的比较研究

源自摩擦起电现象的摩擦发电机（TEG）由于其高输出功率和效率而有望用于能量收集。对 TEG 摩擦材料选择的分析表明，能量产生与摩擦电系列两端发现的异质和均质材料有关。目前的研究发现，随着表面改性的进步，相同摩擦材料之间的接触也存在摩擦起电现象。然而，复合 TEG 和相同均质 TEG 的比较尚未见报道。在本研究中，对有机聚合物膜聚酰胺-6 (PA6) 和聚四氟乙烯 (PTFE) 进行了评估。将膜切成不同尺寸的样品，构建三组 TEG 进行比较。使用相同的膜（即 PA6-PA6 和 PTFE-PTFE）制造了两组相同的 TEG（每组四个样品）；与由两种不同的膜（即 PA6-PTFE）制成的由四个采样 TEG 组成的复合材料组形成对比。通过以 0.2 m/s 的速度和 9.8 N 的垂直力以滑动模式重复对 TEG 进行采样，生成并记录开路电压 ( V _{oc )。}结果，将相同 TEG 的V _oc与复合 TEG 的V _oc进行了比较，其中摩擦材料位于摩擦电序的相对两端。还观察到V _oc与 TEG 的表面积几乎呈线性增加；因此，表明TEG的表面积可以在很大程度上显着影响V _{oc 。}

图形概要