PtOEP Sensitized ZnO Photonic Crystal Serves as Photoanode for Water Splitting

• 1、School of Chemistry and Chemical Engineering,Anhui University,Hefei 230601

Abstract：In recent years, the materials that apply to photoelectrochemical water splitting has been rapidly developed due to the increasing demand of clean and renewable energy. But how to improve photoelectric conversion efficiency is still a huge challenge. Herein, we prepared a Pt(Ⅱ) octaethylporphine (PtOEP) sensitized ZnO inverse opals photoanode in a more gentle and simple way. The sensitization of PtOEP and ordered porous structure broadened the light response range and enhanced the light absorption intensity of the product. Because the band structure of PtOEP is very compatible with that of ZnO, the separation efficiency of photogenerated electrons and holes in this system was greatly improved. In this way, PtOEP sensitized ZnO photonic crystal has high current density (about 0.39 mA cm-2 at 0.7 V vs.RHE) and high photoelectric conversion efficiency (0.26% at 0.62 V vs.RHE).The synthesized ZnO photonic crystal is a promising photoanode in photoelectrochemical water splitting owing to its conspicuous optical and electrochemical properties.

Keywords： sensitization；PtOEP；ZnO；Inverse opal structure water splitting.