Loading...

Modification of Additively Manufactured Stainless Steel 316L Electrodes by Fe-Co-Ni Metal-Organic Framework and Gold Nanoparticle for Electrochemical Water Splitting and CO2 Reduction

Mohammadnejad, Ali | 2022

336 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55359 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Simchi, Abdolreza
  7. Abstract:
  8. The processes of electrochemical water splitting and carbon dioxide reduction are among novel technologies that have gained attention for tackling climate change and global warming. Though, catalysts with fininancial justification for industrial utilization of these processes is still not available. In this study, a 3D-structured electrode of low-carbon 316 stainless steel, made by additive manufacturing, is modified with a trilayered metal-organic framework (MOF), with Iron, Cobalt, and Nickel metallic nodes and BDC-NH2 as the organic ligand, for water splitting. Also, the same steel electrode is modified with a single layered MOF, with Iron node and BDC-NH2 ligand, along with nanoparticles of gold for CO2 reduction and production of CO + H2 gas mixture. All co-catalysts were deposited on stainless steel surface by facile electrodeposition technique and characterized by field-emission scanning electron micrscopy, optical micrscopy, energy-dispersive x-ray spectroscopy, raman spectroscopy, frourier transformed infra-red spectroscopy and x-ray diffraction analysis. Results indicate that the steel subsrate is made of austenite phase, the ligands are present in the MOF structure, and the gold nanoparticles have FCC crystalline structrure. Besides, the average diameter of gold nanoparticles is 34nm. The electrochemical tests showed that the electrode with trilayered MOF has a relatively small overpotential for oxygen evolution reaction and hydrogen evolution reaction, respectively, with 249 mV and 260 mV. Also, with addition of MOF layers, due to the NH2 group of ligand, hydrophilicity of the electrodes increases and the water contact angle decreases from 88 to 72 degrees. The highest achieved faradic efficiency for the CO2 to CO conversion occurs at -0.5V vs. reversible hydrogen electrode potential with 43%. Above this potential, hydrogen evolution reaction rate significantly increases and causes a drop in FE for CO. Both electrodes show a slight decline, for both below 5%, in their activity after 10hours at 10mA/cm2 current density
  9. Keywords:
  10. Electrochemistry ; Additive Manufacturing ; Carbon Dioxide Reduction ; Water Splitting ; Three Dimentional Printing ; Metal-Organic Framework ; 316 Austenitic Stainless Steel

 Digital Object List

 Bookmark

...see more