Enhanced electrochemical activity of Co3O4/Co9S8 heterostructure catalyst for water splitting

Khan, N. A ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijhydene.2021.11.124
  3. Publisher: Elsevier Ltd , 2021
  4. Abstract:
  5. The dearth of efficient, robust, and economical electrocatalysts for water oxidation is dubiously the key obstacle for renewable energy devices, so synthesis of efficient, and cost-effective metal-based water oxidation catalysts is vital. Herein, Co3O4, Co9S8 catalysts and their heterostructure Co3O4/Co9S8 were synthesized and evaluated as water oxidation electrocatalysts. The characterization of Co3O4, Co9S8, and Co3O4/Co9S8 electrocatalysts was performed using Fourier transform infrared spectroscopy, scanning electron microscopy and X-ray diffraction techniques. The heterostructure Co3O4/Co9S8 (1.46 V) exhibited water oxidation electrocatalysis at extremely low onset potential compared to Co3O4 (1.58 V), and Co9S8 (1.48 V) catalysts. A 281 mV overpotential required to attain a current density of 50 mA cm−2 in alkaline solution (1 M KOH), outperforming most of Co-based benchmark electrocatalysts. Further, the Co3O4/Co9S8 heterojunction demonstrated catalytic activity with small Tafel slope of 37 mV dec−1. The finding of electrochemical studies involving controlled potential electrolysis and long-term stability are projected to steer the future advancement in constructing efficient, economical, stable, and earth-abundant metal-based water oxidation catalysts. © 2021 Hydrogen Energy Publications LLC
  6. Keywords:
  7. Oxygen evolution reaction ; Heterostructures ; Water oxidation ; Cobalt oxide ; Cobalt sulfide
  8. Source: International Journal of Hydrogen Energy ; 2021 ; 03603199 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0360319921045122