Figure 4

Performance and electroactivity of the oxygen evolution reaction (OER) at a planar Pt electrode in various types of water-based neutral and acidic electrolytes.

(a) LSV in deionized (DI) water-, blank water- and gold nanoparticle-treated under resonant illumination (sAuNT) water-based neutral electrolytes (0.1 N KCl). (b) The corresponding Tafel plots of DI water- and sAuNT water-based neutral (0.1 N KCl) and acidic (1 N H₂SO₄) electrolytes. (c) LSV in DI water-, blank water- and sAuNT water-based acidic electrolytes (1 N H₂SO₄).