The phytosynthesis of metal oxides nanoparticles (NPs) has been extensively reported; yet mechanism involved and incorporated bioactive compounds in the synthesized NPs are still need to be investigated. In this regard, here an efficient sustainable co-precipitation synthesis of zinc oxide nanoparticles (ZnO NPs) has been developed, employing hydrothermal reactions, using organic compounds of Nasturtium officinale leaves. Pure hexagonal wurtzite ZnO was identified by X-ray diffraction and NPs in the size range of 50–60 nm were observed by field emission scanning electron microscopy. X-ray photoelectron spectroscopy revealed surface modification of ZnO by functional groups associated with the incorporated bio active compounds of Nasturtium officinale. The phyto-functionalized ZnO NPs having anoptical direct band gap of 3.29 eV and optical band gap energy of 2.85 eV were evaluated by cyclic voltammetry at various scan rates, galvanostatic charge–discharge at a range of current densities and electrochemical impedance spectroscopy (Z′ vs. Z″ and Z vs. frequency) in aqueous electrolyte. The fabricated ZnO-based electrode revealed a specific capacitance of 86.5 F/g at 2 mV/s with 97% coulombic efficiency for 2000 cycles. The good electrochemical conductivity was demonstrated by lower internal resistance of 1.04 Ω. Therefore, the present study suggested the significant potential of organic compounds incorporated ZnO NPs towards supercapacitor.

已经广泛报道了金属氧化物纳米颗粒（NPs）的植物合成。然而，仍然需要研究涉及的机制以及在合成的NP中掺入生物活性化合物的机制。在这方面，在这里已经开发了利用金盏花叶的有机化合物利用水热反应进行的氧化锌纳米颗粒（ZnO NPs）的有效的可持续共沉淀合成。通过X射线衍射鉴定出纯六角型纤锌矿型ZnO，并通过场发射扫描电子显微镜观察到50-60 nm范围内的NPs。X射线光电子能谱显示ZnO的表面改性是通过与金莲花的生物活性化合物结合的官能团进行的。通过循环伏安法在各种扫描速率，恒电流下在一定电流密度下的恒电流充放电和电化学阻抗谱（Z'vs.）来评估具有3.29 eV的光学直接带隙和2.85 eV的光学带隙能量的植物功能化ZnO NP。 Z”和Z与频率的关系）。所制造的基于ZnO的电极在2 mV / s时显示出86.5 F / g的比电容，在2000次循环中库仑效率为97％。较低的内阻1.04Ω证明了良好的电化学导电性。因此，本研究表明掺入ZnO NPs的有机化合物具有超级电容器的巨大潜力。