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Bidirectional Hydrogen Electrocatalysis on Epitaxial Graphene

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  • نوع التسجيلة:
    Electronic Resource
  • الدخول الالكتروني :
    http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-186518
    ACS Omega, 2022, 7:15, s. 13221-13227
  • معلومة اضافية
    • Publisher Information:
      Linköpings universitet, Laboratoriet för organisk elektronik Linköpings universitet, Tekniska fakulteten Linköpings universitet, Halvledarmaterial 2022
    • Added Details:
      Vagin, Mikhail
      Ivanov, Ivan Gueorguiev
      Yakimova, Rositsa
      Shtepliuk, Ivan
    • نبذة مختصرة :
      The climate change due to human activities stimulates the research on new energy resources. Hydrogen has attracted interest as a green carrier of high energy density. The sustainable production of hydrogen is achievable only by water electrolysis based on the hydrogen evolution reaction (HER). Graphitic materials are widely utilized in this technology in the role of conductive catalyst supports. Herein, by performing dynamic and steady-state electrochemical measurements in acidic and alkaline media, we investigated the bidirectional electrocatalysis of the HER and hydrogen oxidation reaction (HOR) on metal- and defect-free epigraphene (EG) grown on 4H silicon carbide (4HSiC) as a ground level of structural organization of general graphitic materials. The absence of any signal degradation illustrates the high stability of EG. The experimental and theoretical investigations yield the coherent conclusion on the dominant HER pathway following the Volmer-Tafel mechanism. We ascribe the observed reactivity of EG to its interaction with the underlying SiC substrate that induces strain and electronic doping. The computed high activation energy for breaking the O-H bond is linked to the high negative overpotential of the HER. The estimated exchange current of HER/HOR on EG can be used in the evaluation of complex electrocatalytic systems based on graphite as a conducing support.
      Funding Agencies|Angpanneforeningens Forskningsstiftelse [16-541, 21-112]; VR [2018-04962]; SSF [RMA 15-0024]
    • الموضوع:
      Inorganic Chemistry; Oorganisk kemi; Article in journal; info:eu-repo/semantics/article; text
    • الرقم المعرف:
      10.1021.acsomega.2c00655
    • Note:
      application/pdf
      English
    • Other Numbers:
      UPE oai:DiVA.org:liu-186518
      0000-0001-8478-4663
      0000-0003-1000-0437
      0000-0002-8685-3332
      doi:10.1021/acsomega.2c00655
      PMID 35474826
      ISI:000812568800001
      1372211970
    • Contributing Source:
      UPPSALA UNIV LIBR
      From OAIster®, provided by the OCLC Cooperative.
    • الرقم المعرف:
      edsoai.on1372211970
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