Supplementary Information

Aqueous photo(electro)catalysis with eumelanin thin films

Ludovico Migliaccio, Maciej Gryszel, Vedran Ðerek, Alessandro Pezzella, Eric Daniel Głowacki*

Electronic Supplementary Material (ESI) for Materials Horizons.This journal is © The Royal Society of Chemistry 2018

Fig. S1. Example calibration curve for the horseradish peroxidase/tetramethyl benzidine peroxide assay.

Fig. S2. Photoelectrochemical H-cell measurement configuration with Eumelanin modified FTO as the working electrode. Aqueous electrolytes in the pH range 1-7 were used, purged with either O2 or Ar.

Fig. S3. Chronoamperometric photocurrents used to construct the photocurrent action spectra Fig. 3c and 4b. in Oxygenated system (top). Deoxygenated system (bottom).

200 300 400 500 600 700

-5

-4

-3

-2

Comparison of photocurrents recorded with different LEDs of the same light power. pH = 1, 0 V vs Ag/AgCl. Oxygenated

385 nm 450 nm 490 nm 515 nm 660 nm 680 nm 410 nm

J [µ

A/cm

2 ]

t [s]

200 300 400 500 600 700-4

-3

-2

-1

0

385 nm 410 nm 450 nm 490 nm 515 nm 660 nm 680 nm

J [µ

A/cm

2 ]

t [s]

Comparison of photocurrents recorded with different LEDs of the same light power. pH = 1, -0,25 V vs. Ag/AgCl. Deoxygenated