Efficient Water Oxidation Catalyzed by a Graphene Oxide/Copper Electrode, Supported on Carbon Cloth

 Behnam Nourmohammadi Khiarak Behnam Nourmohammadi Khiarak , Saeed Imanparast Saeed Imanparast , Mahrokh Mamizadeh Yengejeh Mahrokh Mamizadeh Yengejeh , Ayda Asaadi Zahraei Ayda Asaadi Zahraei , Roya Yaghobi Roya Yaghobi , Mohammad Golmohammad Mohammad Golmohammad
Russian Journal of Electrochemistry
Abstract / Full Text

Cost-effectiveness, high performance, and stable electrocatalysts toward oxygen evolution reaction (OER) play a vital role in improving energy technology. In this study, composite materials consisting of electrochemically reduced graphene oxide (ERGO)/sulfur-doped copper oxide supported with carbon cloth (CC) was successfully synthesized as an efficient OER electrocatalyst in NaOH electrolyte. The results of the X-ray diffraction pattern revealed the effect of sulfur on copper as dopant and a transformation from GO to reduced GO through an electrochemical route, respectively. Furthermore, scanning electron microscopy micrographs showed the dendritic structure that had a high surface area to be used for electrochemical applications. Moreover, energy-dispersive X-ray spectroscopy revealed the uniformly-successive distribution of Cu and sulfur throughout the structure that enabled a high rate of diffusion of ions and electrons across the electrode and electrolyte interface. As a matter of fact, the prepared electrocatalyst in this work (ERGO/S-doped Cu/CC) showed a small overpotential of 390 mV to reach a current density of 30 mA cm–2. The ERGO/S-doped Cu/CC demonstrated good durability under conditions of high applied potential of 0.7 V (vs. Ag/AgCl) and robust alkaline solution. The good OER activity of ERGO/S-doped Cu/CC is related to the presence of the graphene and sulfurized copper, enhancing the electrochemical surface area as well as the synergetic effects of sulfurized copper and ERGO sheets. This efficient and cost-effective electrocatalyst suggests that the prepared electrode can be a candidate for an OER electrode.

Author information
  • Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran

    Behnam Nourmohammadi Khiarak

  • Biomedical Engineering Department, School of Electrical Engineering, Tabriz University, Tabriz, Iran

    Saeed Imanparast

  • Department of Metallurgy and Materials Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran

    Mahrokh Mamizadeh Yengejeh

  • Department of Metallurgy and Materials Engineering, Khaje Nasir Toosi University of Technology, Tehran, Iran

    Ayda Asaadi Zahraei

  • Department of Renewable Energy, Niroo Research Institute, Tehran, Iran

    Mohammad Golmohammad

  • Department of Metallurgy and Materials Engineering, Urmia University, Urmia, Iran

    Roya Yaghobi

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