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Fabrication and Characterization of Conifecu and Three Dimensional Graphene Electrocatalyst Toward Oxygen Evolution Reaction

Nourmohammadi Khiarak, Behnam | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52687 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Simchi, Abdolreza
  7. Abstract:
  8. Development of active, durable, cost effective, and stable electrocatalysts are of urgent need for various industrial fields including renewable energy systems such as water splitting. State-of-the-art catalysts suffer from high cost, poor catalytic activity in alkaline medium due to sluggish kinetics. We used one-step electrochemical deposition technique to prepare NiFeCu layered double hydroxide and CoNiFeCu dendritic porous structure on Ni-foam and flexible three-dimensional graphene (3DG) networks, respectively. The fabricated 3D electrodes have a high surface area, high electrical conductivity, and multiple interfaces which along with the synergetic effect of transition metals provided high electrochemical activity. It is shown that the 3D electrodes promote dissociative adsorption of water molecules. An outstanding current density of 100 mA cm-2 with just a low overpotential of 315 mV for oxygen evolution reaction is obtained for CoNiFeCu electrode. A superior figure of merit including a low Tafel slop of (66.8 mV dec-1) and low diffusion resistance toward oxygen evolution reaction is demonstrated. A long-term stability with maintenance of more than 95% of initial current density after 12000 s oxygen evolution is exhibited. The long-term stability of the electrode makes it suitable as high performance electrocatalyst for water splitting
  9. Keywords:
  10. Transition Metals ; Electrocatalysts ; Oxygen Evoloution Reaction (OER) ; Dendritic Crystals ; Three Dimensional Gravity ; Layered Double Hydroxide (LDH)

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