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MIL-88A derived CoFe-layered double hydroxides with optimized composition for the enhanced electrocatalytic oxygen evolution reaction

Taherinia, D ; Sharif University of Technology | 2023

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  1. Type of Document: Article
  2. DOI: 10.1039/d2nj06061b
  3. Publisher: Royal Society of Chemistry , 2023
  4. Abstract:
  5. The oxygen evolution reaction (OER) as the anodic half-reaction of water electrolysis has received growing attention due to its paramount role in the green and sustainable production of hydrogen fuel and metal-air batteries. Herein, we report the synthesis of five CoFe-layered double hydroxides (CoFe-LDHs) and their application toward the electrocatalytic OER in an alkaline medium. CoFe-LDHs were prepared via a novel hydrothermal route from the MIL-88A metal-organic framework (MOF). The Co-to-Fe ratios in the LDHs were systematically modified to tune the electrocatalytic activity in the OER. It was observed that the as-prepared Co0.39Fe0.61-LDH demonstrated a superior electrocatalytic performance compared to the rest of the materials. More precisely, Co0.39Fe0.61-LDH required an overpotential of 227 mV to derive 20 mA cm−2 current density with a Tafel slope of 36.8 mV dec−1 and exhibited remarkable electrochemical stability. Besides, this LDH delivered an industrial-scale current density of 600 mA cm−2 at an overpotential of 284 mV. Our results imply that modulating the metal content of LDHs is a simple yet effective strategy to promote their electrocatalytic activity toward the OER. © 2023 The Royal Society of Chemistry
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  8. Source: New Journal of Chemistry ; Volume 47, Issue 11 , 2023 , Pages 5555-5563 ; 11440546 (ISSN)
  9. URL: https://pubs.rsc.org/en/content/articlelanding/2023/nj/d2nj06061b