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Photocatalytic- and Photoelectrochemical water splitting is currentlyperformed using radiation sources with wavelengths < 1000 nm, i.e. in the nearinfrared range (NIR). The fact that water has a broad absorption band, whichlies at wavenumbers between 3000 and 3700 cm-1 (stretching mode) and 1650 cm-1(bending mode), has not been taken into account so far. We irradiated the steelanode with a mid-infrared LED (lambda=3300 nm) while water electrolysis wasperformed in pH 7-corrected phosphate buffer solution. A significant shift (270mV) of the cyclic voltammetry (CV) curve towards lower potential values wasobtained when the radiation source was on. To the best of our knowledge, thisis the first report describing the use of a mid-infrared radiation source toincrease the efficiency of water electrolysis.

Mid-infrared assisted water electrolysis as a method to substantially push down the overpotential of the oxygen evolution reaction