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Electrodeposition of Platinum on Silver Electrode Substrate for Water Splitting

Fouji, Mohammad | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57308 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Dolati, Abolghassem
  7. Abstract:
  8. Hydrogen, as a clean energy carrier, plays a crucial role in the transition towards a sustainable economy. One of the methods for hydrogen production is water splitting using electrical energy. This process faces challenges due to the need for efficient yet low-cost electrodes. In this study, the aim was to synthesize platinum electrodes using an efficient and cost-effective method on a silver substrate using an ammoniumnitrate platinum bath and investigate the effect of various operational parameters on their microstructure, morphology, and electrocatalytic activity in hydrogen and oxygen evolution reactions. The results showed that the microstructure and morphology of platinum coatings significantly improved with increasing current density. A deposition time of one minute resulted in a more suitable microstructure compared to 30 seconds. A temperature of 80 °C was more appropriate for using an electrolyte with a platinum concentration of 2 g/L. Among the electrodes, the one coated at a current density of 7 mA/cm², a time of one minute, and a bath temperature of 80 °C exhibited the best performance in hydrogen and oxygen evolution reactions. This electrode showed an η (10) of approximately 350 mV for the oxygen evolution reaction and an η (10) of 38 mV for the hydrogen evolution reaction. It also exhibited a Tafel slope of approximately 39 mV/dec for the hydrogen evolution reaction and a Tafel slope of 100 mV/dec for the oxygen evolution reaction. The electrochemical stability of this electrode was confirmed by a voltammetric test over a 10-hour period at a current density of 100 mA/cm². The results of this study demonstrate that the electrochemical deposition method from an ammoniumnitrate platinum bath is an efficient and cost-effective method for synthesizing platinum electrodes with acceptable electrocatalytic activity for hydrogen and oxygen evolution reactions. This method can be used as an alternative to more expensive platinum electrode synthesis methods in electrochemically driven water splitting processes
  9. Keywords:
  10. Electrochemical Deposition ; Platinum ; Water Splitting ; Hydrogen Evolution Reaction ; Oxygen Evolution Reaction (OER) ; Silver Electrode

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  • دانشگاه صنعتی شریف
  • eng