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ZIF-8/PEDOT @ flexible carbon cloth electrode as highly efficient electrocatalyst for oxygen reduction reaction

Asadian, E ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijhydene.2019.11.124
  3. Publisher: Elsevier Ltd , 2019
  4. Abstract:
  5. Design and fabrication of highly efficient and low-cost oxygen reduction reaction (ORR) electrocatalysts is of paramount importance for practical applications. Herein, we proposed a cost-effective, metal-free catalyst based on ZIF-8 metal-organic framework nanoparticles/electro-polymerized poly(3,4-ethylenedioxythiophene) (PEDOT) film on the surface of flexible carbon cloth (CC) electrode (ZIF-8/PEDOT/CC) via a two-step procedure. For this purpose, worm-like PEDOT nanostructures were deposited on the surface of carbon fibers using a pulse electro-polymerization technique followed by facile growth of ZIF-8 polyhedra nanoparticles via a chemical bath deposition method. The ORR measurements in O2-saturated KOH electrolyte solution using the modified CC electrode demonstrated that the prepared electrode exhibits remarkable electrocatalytic activity towards ORR with 8 times increase in the cathodic current density compared to bare CC (J = 0.13–1.1 mA/cm2) along with lower overpotential due to the synergetic effects between ZIF-8 nanoparticles as particularly porous nanostructure act as electrolyte reservoirs and highly conductive PEDOT film. The Kouteckey-Levich analysis for the ZIF-8/PEDOT-modified CC electrode revealed that the oxygen reduction reaction proceeds via a nearly four-electron pathway along with superior tolerance to methanol crossover as well as enhanced stability in alkaline solution compared to the gold standard commercial Pt catalyst. © 2019 Hydrogen Energy Publications LLC
  6. Keywords:
  7. Carbon cloth ; Electrocatalyst ; Oxygen reduction reaction ; Poly(3,4-ethylenedioxythiophene) ; ZIF-8 nanoparticles ; Alkalinity ; Cost effectiveness ; Electrocatalysts ; Electrolytes ; Electrolytic reduction ; Metal nanoparticles ; Organometallics ; Oxygen ; Potassium hydroxide ; Carbon cloths ; Chemical bath deposition methods ; Electrocatalyst for oxygen reduction reactions ; Electrocatalytic activity ; Flexible carbon cloth electrodes ; Poly(3 ,4 ethylenedioxythiophene) (PEDOT) ; Poly-3 ,4-ethylenedioxythiophene ; Electrodes
  8. Source: International Journal of Hydrogen Energy ; 2019 ; 03603199 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0360319919343460