اميرحسين شيدادل

As energy deman‎d continues to rise daily, along with the finite nature of fossil fuels an‎d environmental pollution, there remains a constant need to identify alternative fuels. Hydrogen production via electrochemical processes using inexpensive, high-performance catalysts is one of the best options an‎d serves as a mechanism for storing a clean an‎d sustainable energy source. In this thesis, for the first time, a CoFe-LDH/Ni nanotube/NF nanoarchitecture was synthesized electrochemically in two stages. In the first stage, using a fixed-penetration deposition approach, a Ni nanotube layer was deposited onto a nickel foam substrate. In the second stage, a CoFe-LDH layer was electrodeposited at a fixed potential on the first layer under controlled conditions, such as time an‎d potential. Since the time an‎d potential during the deposition of the second layer influence the process, optimization for the second layer was performed. Conventional electrochemical tests for assessing the activity an‎d stability of electrocatalysts were conducted in a 1 M NaOH electrolyte solution. According to the results, the optimized electrode achieves a very high hydrogen evolution reaction (HER) efficiency at an overpotential (RHE) of 5 mV an‎d −237 mV at current densities of 10 an‎d 100 mA·cm⁻², respectively, after a deposition time of 225 seconds an‎d at a potential of −1/4V. The electrode also demonstrated excellent stability for at least 12 hours. The results indicate a synergistic effect when Ni nanotube an‎d CoFe-LDH electrocatalysts are used simultaneously, which increases the surface-to-volume ratio an‎d enhances the number of active sites. Due to its high performance for HER, along with straightforward, rapid synthesis an‎d avoidance of expensive materials, the proposed electrode could be an excellent can‎didate for electrochemical water splitting.

قوم نيكل , الكتروكاتاليزگر , واكنش تكاملي هيدروژن

Nickle foam , Electrocatalyst , Hydrogen Evolution Reaction

Amirhosein Sheidadel

Faranak Manteghi-Mahboubeh Rabbani