Seger, Brian1; Herbst, Konrad7; Pedersen, Thomas6; Abrams, Billie7; Vesborg, Peter Christian Kjærgaard1; Hansen, Ole2; Chorkendorff, Ib1
1 Department of Physics, Technical University of Denmark2 Experimental Surface and Nanomaterials Physics, Department of Physics, Technical University of Denmark3 Silicon Microtechnology, Department of Micro- and Nanotechnology, Technical University of Denmark4 Department of Micro- and Nanotechnology, Technical University of Denmark5 Haldor Topsoe AS6 DTU Danchip, Technical University of Denmark7 Haldor Topsoe AS
This work shows how a molecular Mo3S4 cluster bonded to a photoelectrode surface via a phosphonate ligand can be a highly effective co-catalyst in photocathodic hydrogen evolution systems. Using a TiO2 protected n+p Si photocathode, H2 evolution occurs with an onset of +0.33 V vs. RHE in an acid solution with this precious metal-free system. Using just the red part of the AM1.5 solar spectrum (λ > 635 nm), a saturation current of 20 mA/cm2 is achieved from an electrode containing Mo3S4 dropcasted onto a 100 nm TiO2/7 nm Ti/n+p Si electrode.
Journal of the Electrochemical Society, 2014, Vol 161, Issue 12