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Electrocatalytic hydrogen evolution reaction on graphene supported transition metal-organic frameworks

Nourmohammadi, Khiarak, B ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.inoche.2021.108525
  3. Publisher: Elsevier B. V , 2021
  4. Abstract:
  5. A highly efficient, cost-effective, and durable electrocatalysts based on CoNi metal–organic framework (MOF) nanosheets on highly porous conductive graphene (PCG) is introduced for the hydrogen evolution reaction (HER). The electrocatalyst was fabricated by template-assisted chemical vapor deposition of graphene followed by solvothermal growth of CoNi-MOF nanosheets. Highly porous 3D structure of PCG with open channels of 200–500 nm sizes provided high active surface area and facilitates gas evolution. In a highly alkaline solution, the electrocatalyst exhibits superior figures of merits, e.g. overpotential of 265 mV at −10 mA cm−2 and Tafel slope of 44.5 mV dec-1, to existing hydrogen electrocatalysts. The resulting electrocatalyst exhibits the synergetic effect of CoNi-MOF and electroactive catalytic surface area of PCG on promoting the outstanding electrocatalytic performance. Electrochemical impedance spectroscopy evidenced high diffusion rate and fast charge transfer capability of CoNi-MOF-PCG electrode. This study opens up new possibility for design and fabrication of highly efficient bimetallic electrocatalysts for water splitting applications. © 2021 Elsevier B.V
  6. Keywords:
  7. Electrocatalyst ; Hybrid carbon–metal organic framework material ; Porous conductive graphene ; Hydrogen production ; Environmental ; Electrochemistry
  8. Source: Inorganic Chemistry Communications ; Volume 127 , May , 2021 ; 13877003 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S1387700321000848?via%3Dihub