Study On Dye - Sensitized Photolysis Of Water Molecule Based On Ruthenium Catalyst

To satisfy the growing demand for energy and solve the increasingly serious environmental pollution problems, light induced water splitting became a hot global issue. Dye-Sensitized Photoelectrochemical Cells, as a feasible way to split water into hydrogen and oxygen, attracted great attention around the world. In this article, co-adsorption DSPECs and supramolecular DSPECs were assembled based on Ru water oxidation catalyst and high photoactivies was obtained.A three-electrode system DSPEC was assembled with [Ru(bpy)2(4,4-(PO3H2)2bpy)]Br2 and Ru water oxidation catalyst synthesized with silicon group. With a 300 W xenon lamp white-light source coupled to a 400 nm long-pass filter (300 mW/cm2), an extra bias of 0.20 V (V vs NHE), a photocurrent density of 1700 μA/cm2 was obtained after 10 seconds’ light illumination in phosphate buffer. A maximum IPCE value of 14% was obtained around 450 nm. Based on the same photoanode, a two-electrode system DSPEC was also assembled. A photocurrent density of 70 μA/cm2 was obtained after 10 seconds’ light illumination with a 300 W xenon lamp white-light source coupled to a 400 nm long-pass filter (100 mW/cm2) in 0.1 M Na2SO4 aqueous solution.The IPCE value was 1.85% at around 450 nm.A new DSPEC was assembled based on [Ru(bpy)2(4,4-(PO3H2)2bpy)]Br2 and Ru water oxidation catalyst synthesized with phosphate group. Electrolyte was confirmed as an important part in affecting photoactivities of DSPECs. Surface modification effect of buffer anion was studied as the main factor to affect photoactivies rather than ion strength or pH value. A kind of organic silicon compound was involved to decorate TiO2 surface of DSPEC. Both high stabilities and high photoactivities were obtained based the decorated DSPECs.Then, a supramolecular DSPEC was assembled using Zr4+ as linkage. With a 300 W xenon lamp white-light source coupled to a 400 nm long-pass filter (300 mW/cm2), an extra bias of 0.20 V (V vs NHE), a photocurrent density of 480 μA/cm2 was obtained after 10 seconds’ light illumination in 0.1 M Na2SO4 aqueous solution. And a maximum IPCE value of 1.85% was obtained around 450 nm. This DSPEC displayed highest photoactivities among supramolecualr DSPECs.