Arkan Mesude Zeliha, Kinas Zeynep, Yalcin Eyup, Arkan Emre, Özel Faruk, Karabiber Abdulkerim, Chorążewski Mirosław
Institute of Chemistry, University of Silesia, Szkolna, 40-006 Katowice, Poland.
Electrical Engineering Department, Bingol University, Bingol 12000, Türkiye.
Molecules. 2023 Jul 26;28(15):5662. doi: 10.3390/molecules28155662.
Molecular engineering is a unique methodology to take advantage of the electrochemical characteristics of materials that are used in energy-harvesting devices. Particularly in triboelectric nanogenerator (TENG) studies, molecular grafting on dielectric metal oxide surfaces can be regarded as a feasible way to alter the surface charge density that directly affects the charge potential of triboelectric layers. Herein, we develop a feasible methodology to synthesize organic-inorganic hybrid structures with tunable triboelectric features. Different types of self-assembled monolayers (SAMs) with electron-donating and withdrawing groups have been used to modify metal oxide (MO) surfaces and to modify their charge density on the surface. All the synthetic routes for hybrid material production have been clearly shown and the formation of covalent bonds on the MO's surface has been confirmed by XPS. The obtained hybrid structures were applied as dopants to distinct polymer matrices with various ratios and fiberization processes were carried out to the prepare opposite triboelectric layers. The formation of the fibers was analyzed by SEM, while their surface morphology and physicochemical features have been measured by AFM and a drop shape analyzer. The triboelectric charge potential of each layer after doping and their contribution to the TENG device's parameters have been investigated. For each triboelectric layer, the best-performing tribopositive and tribonegative material combination was separately determined and then these opposite layers were used to fabricate TENG with the highest efficiency. A comparison of the device parameters with the reference indicated that the best tribopositive material gave rise to a 40% increase in the output voltage and produced 231 V, whereas the best tribonegative one led to a 33.3% rise in voltage and generated 220 V. In addition, the best device collected ~83% more charge than the reference device and came up with 250 V that corresponds to 51.5% performance enhancement. This approach paved the way by addressing the issue of how molecular engineering can be used to manipulate the triboelectric features of the same materials.
分子工程是一种利用能量收集装置中所用材料的电化学特性的独特方法。特别是在摩擦电纳米发电机（TENG）研究中，在介电金属氧化物表面进行分子接枝可被视为改变表面电荷密度的一种可行方法，而表面电荷密度直接影响摩擦电层的电荷电位。在此，我们开发了一种可行的方法来合成具有可调摩擦电特性的有机-无机杂化结构。已使用具有供电子和吸电子基团的不同类型的自组装单分子层（SAMs）来修饰金属氧化物（MO）表面并改变其表面电荷密度。已清楚展示了用于生产杂化材料的所有合成路线，并且通过X射线光电子能谱（XPS）证实了MO表面上共价键的形成。将所得的杂化结构以不同比例用作不同聚合物基质的掺杂剂，并进行纤维化过程以制备相反的摩擦电层。通过扫描电子显微镜（SEM）分析纤维的形成，同时通过原子力显微镜（AFM）和滴形分析仪测量其表面形态和物理化学特征。研究了掺杂后各层的摩擦电荷电位及其对TENG器件参数的贡献。对于每个摩擦电层，分别确定了性能最佳的摩擦正性和摩擦负性材料组合，然后使用这些相反的层来制造效率最高的TENG。将器件参数与参考值进行比较表明，最佳的摩擦正性材料使输出电压提高了40%，产生了231 V，而最佳的摩擦负性材料使电压提高了33.3%，产生了220 V。此外，最佳器件收集的电荷比参考器件多约~83%，产生了250 V，对应性能提高了51.5%。这种方法通过解决如何利用分子工程来操纵相同材料的摩擦电特性这一问题，为相关研究铺平了道路。
