Duya C O, Okumu F O, Matoetoe M C
Department of Chemistry, Cape Peninsula University of Technology, P.O. Box 1906, Bellville, South Africa.
Department of Physical Sciences, Jaramogi Oginga Odinga University of Science and Technology, P. O. Box 210, 40601, Bondo, Kenya.
Heliyon. 2024 Aug 28;10(17):e36974. doi: 10.1016/j.heliyon.2024.e36974. eCollection 2024 Sep 15.
Electrode modification has been one of the most active areas of interest in electrochemistry research. Hence, the investigation of the effects of chemically and electrochemically modified GCE nano-films on the NPs electrochemical properties. The electrochemistry of nano-films of Ag NPs, Au NPs and bimetallic Ag-Au (1:2) NPs of chemical citrate reduction synthesis drop coated (DCT) and electro-deposition method (EDP) are reported. The Chemically synthesized NPs were confirmed through FT-IR, UV-visible, XRD and SEM techniques while electro-deposited NPs were ascertained by double-pulsed chrono-amperometry and electrochemical impedance spectroscopy (EIS). The nano films; GCE/Ag NPs, GCE/Au NPs and GCE/Ag-Ag (1:2) NPs in 0.1 M HCl supporting electrolyte were studied via Cyclic Voltammetry (CV) and Differential Pulse Voltammetry (DPV) techniques. Generally the DCT nano films were electrochemically superior to the EDP film in terms of current intensities and GCE/Ag-Au (1:2) NPs showed enhanced α (0.019), (0.01 s), Q (3.6 × 10 C), (5.3 × 10molescm) and D (1.31 × 10 cms), indicating better physicochemical properties for possible sensing applications compared to electro-deposited GCE nano-films.
电极修饰一直是电化学研究中最活跃的研究领域之一。因此，研究了化学和电化学修饰的玻碳电极纳米膜对纳米颗粒电化学性质的影响。报道了通过化学柠檬酸盐还原合成的银纳米颗粒、金纳米颗粒和双金属银 - 金（1:2）纳米颗粒的纳米膜，采用滴涂法（DCT）和电沉积法（EDP）制备。通过傅里叶变换红外光谱（FT - IR）、紫外 - 可见光谱、X射线衍射（XRD）和扫描电子显微镜（SEM）技术对化学合成的纳米颗粒进行了表征，而通过双脉冲计时电流法和电化学阻抗谱（EIS）对电沉积的纳米颗粒进行了测定。在0.1 M HCl支持电解质中，通过循环伏安法（CV）和差分脉冲伏安法（DPV）技术研究了纳米膜：玻碳电极/银纳米颗粒、玻碳电极/金纳米颗粒和玻碳电极/银 - 金（1:2）纳米颗粒。一般来说，在电流强度方面，滴涂法制备的纳米膜在电化学性能上优于电沉积膜，并且玻碳电极/银 - 金（1:2）纳米颗粒表现出增强的α（0.019）、τ（0.01 s）、Q（3.6×10⁻⁶ C）、C*（5.3×10⁻⁸ moles/cm²）和D（1.31×10⁻⁵ cm²/s），表明与电沉积的玻碳电极纳米膜相比，其具有更好的物理化学性质，可用于可能的传感应用。
