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Selective anodes for seawater splitting via functionalization of manganese oxides by a plasma-assisted process
Bigiani, L.; Barreca, D.; Gasparotto, A.; Andreu, T.; Verbeeck, J.; Sada, C.; Modin, E.; Lebedev, O.I.; Morante, J.R.; Maccato, C. (2021). Selective anodes for seawater splitting via functionalization of manganese oxides by a plasma-assisted process. Appl. Catal. B. 284: 119684. https://hdl.handle.net/10.1016/j.apcatb.2020.119684
In: Applied Catalysis B: Environmental. Elsevier: Amsterdam. ISSN 0926-3373; e-ISSN 1873-3883, more
Peer reviewed article  
Available in  Authors 
Keyword
    Marine/Coastal
Author keywords
    Manganese oxides; Plasma enhanced-chemical vapor deposition; Sputtering; Oxygen evolution reaction; Seawater splitting
Authors  Top 
  • Bigiani, L.
  • Barreca, D.
  • Gasparotto, A.
  • Andreu, T.
  • Verbeeck, J., more
  • Sada, C.
  • Modin, E.
  • Lebedev, O.I.
  • Morante, J.R.
  • Maccato, C.
Abstract
    The electrolysis of seawater, a significantly more abundant natural reservoir than freshwater, stands as a promising alternative for sustainable hydrogen production, provided that the competitive chloride electrooxidation is minimized. Herein, we propose an original material combination to selectively trigger oxygen evolution from seawater at expenses of chlorine generation. The target systems, based on MnO2 or Mn2O3 decorated with Fe2O3 or Co3O4, are fabricated by plasma enhanced-chemical vapor deposition of manganese oxides, functionalization with Fe2O3 and Co3O4 by sputtering, and annealing in air/Ar to obtain Mn(IV)/Mn(III) oxides. Among the various options, MnO2 decorated with Co3O4 yields the best performances in alkaline seawater splitting, with an outstanding Tafel slope of ≈40 mV × dec−1 and an overpotential of 450 mV, enabling to rule out chlorine evolution. These attractive performances, resulting from the synergistic contribution of catalytic and electronic effects, open the door to low-cost hydrogen generation from seawater under real-world conditions, paving the way to eventual large-scale applications.
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