The TiO2 working photoanodes were assembled and hot-sealed with the sputtered counter Pt electrodes. The electrolyte, 0.6 M 1,2-dimethyl-3-propylimidazolium iodide, 0.1 M LiI, 0.05 M I2, and 0.5 M 4-tert-butylpyridine in acetonitrile was injected into the cell quickly by a transfer liquid gun.