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Ultrafine Co nanoislands grafted on tailored interpenetrating N-doped carbon nanoleaves: An efficient bifunctional electrocatalyst for rechargeable Zn-air batteries

Zhang, F ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1016/j.cej.2021.133734
  3. Publisher: Elsevier B.V , 2022
  4. Abstract:
  5. Zeolitic imidazole frameworks (ZIFs) provide an exciting platform to design and fabricate non-precious-metal carbon-based catalysts for oxygen reduction/evolution reaction (ORR/OER). Herein, we elaborately design a facile enzyme-assisted synthetic strategy that enables to tailor the ZIFs precursors into structural stable decussation shape, which derived Co nanoislands grafted on decussate N-doped carbon nanoleaves (D-Co@NC) can well retain the interpenetrating nanostructure. Benefiting from the combined advantages of compositions and interpenetrating nanostructures, D-Co@NC possesses 5.2 times higher exposed electrochemical active area than the conventional dodecahedral one, thus endowing the superior bifunctional activity toward ORR and OER with a low potential gap (ΔE) of 0.866 V. When applicated in Zn-air battery, the D-Co@NC electrode displays a high peak power density of 115.4 mW cm−2 and energy density of 879.6 Wh kg−1 as well as excellent long-cycling stability more than 200 h, outperforming benchmark catalysts of Pt/C||RuO2. The work provides a promising way to construct ZIFs-derived non-precious-metal electrocatalyst for advanced metal-air batteries. © 2021 Elsevier B.V
  6. Keywords:
  7. Co grafted on N-doped carbon (Co@NC) ; Decussation materials ; Oxygen electrocatalysts ; Zeolitic imidazole frameworks (ZIFs) ; Zn-air batteries ; Carbon ; Doping (additives) ; Electrocatalysts ; Electrolytic reduction ; Grafting (chemical) ; Nanostructures ; Precious metals ; Ruthenium compounds ; Zinc air batteries ; Co grafted on N-doped carbon ; Decussation material ; Doped carbons ; Imidazol ; N-doped ; Nano-islands ; Non-precious metals ; Oxygen electrocatalyst ; Ultrafine ; Zeolitic imidazole framework ; Oxygen
  8. Source: Chemical Engineering Journal ; Volume 431 , 2022 ; 13858947 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S1385894721053080