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. 2015 Nov 6;5:16263. doi: 10.1038/srep16263

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(a) SEM image of the roughened Au electrode (0.283 cm²) which was prepared by using electrochemical oxidation-reduction cycles (ORCs). (b) The sketch reveals the combination of in situ producing and splitting (H)RHBW). (c) LSVs of hydrogen evolution in DI water containing 0.5 M H₂SO₄ at an electrochemically roughened Au electrode with different illumination sources (lamp and green-light LED).