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Keywords:

  • cobalt;
  • electrochemistry;
  • hydrogen;
  • photochemistry;
  • water splitting
Thumbnail image of graphical abstract

Protons preferred: A cobalt catalyst is reported that evolves H2 electro- and photocatalytically at room temperature, in pH-neutral water, and in the presence of atmospheric O2 (see scheme). The catalyst shows respectable Faradaic efficiencies under N2 and 21 % O2 in N2, and can be used under both homogeneous and heterogeneous conditions.