TEORITICAL STUDY ON QUANTUM CAPACITANCE OF SURFACE OF NIFE SUPERCAPACITOR ELECTRODE

• Main Author: Reynaldi, Victor
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/63139
• Institution: Institut Teknologi Bandung

The rapid development of nanotechnology in electronic devices has led to the smaller dimensions of electronic devices. The impact of these dimensions causes quantum effects on electronic devices, one of which is the quantum capacitance (formula) on the supercapacitor electrode. (formula) has an important effect on the maximum performance of the supercapacitor. Iron-nickel alloy (NiFe) is one of the promising supercapacitor electrode materials and is popularly researched because it has good corrosion resistance and cycle stability, as well as high capacitance. This study aims to observe the (formula) characteristics of the NiFe supercapacitor electrode surface fundamentally using the density functional theory (DFT) approach computationally with the Vienna Ab Initio Simulation Package software. My simulation obtains a structural model of bcc NiFe(110) with a concentration of 33.33%Ni as the most stable model according to the experimental results. Based on this model, it is known that the formation of the NiFe(110) layer on Fe(110) cannot occur spontaneously but requires a minimum external energy of growth of 13.91 eV. Then the substitution of Ni on the surface of Fe(110) significantly increased the (formula) of Fe(110) with the highest (formula) of 1022.26 F/cm2. In addition, the substitution of Ni on the surface of Fe(110) also increases the corrosion resistance of Fe(110). Calculation of potential variation of electrode application to (formula) NiFe(110) at room temperature shows that NiFe(110) has better positive electrode characteristics than Fe(110). Based on these results, I recommend NiFe(110) as the material of choice for supercapacitor positive electrodes.