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Additive Manufacturing of Structured Stainless Steel Electrodes Functionalized with Transition Metal-Oorganic Frameworks for Water Splitting

Orouji, Mina | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57098 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Simchi, Abdolreza
  7. Abstract:
  8. Water splitting reaction always faces challenges such as low efficiency, slow kinetics, and long-term instability of the catalyst. In this study, an electrode made of low-carbon 316 stainless steel fabricated by selective laser melting was initially used as the catalyst. The overpotential for hydrogen evolution reaction at a current density of 10 mA cm-2 using this electrode was calculated to be -0.505 V vs. RHE. This electrode had the capability of producing hydrogen gas at a rate of 3.6 mL min-1. Then, to reduce the overpotential, improve the efficiency, and stability of this electrode, its surface was modified by electrochemical methods, and metal-organic framework with cores of iron, nickel, and cobalt were electrodeposited onto it. This coating reduced the hydrogen evolution overpotential to -0.240 V vs. RHE at a current density of 10 mA cm-2. Additionally, this coating increased the hydrogen production rate to 14.4 mL min-1. Using amorphous borates of iron, cobalt, and nickel, oxygen production was enabled at an overpotential of 0.250 V vs. RHE at a current density of 10 mA cm-2. The oxygen gas production rate in this condition was calculated to be 10.8 mL min-1. Both synthesized electrocatalysts were subjected to a current density of +100 and -100 mA cm-2 for 10 hours. According to the results of this study, relatively inexpensive electrodes with suitable efficiency for water splitting can be obtained
  9. Keywords:
  10. Additive Manufacturing ; Metal-Organic Framework ; Water Splitting ; Selective Laser Melting (SLM) ; Stainless Steel

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