Functional Photoanode Based On Tin(Ⅳ) Porphyrin As A Photosensitiser For Light-driven Water Oxidation

Harvesting sunlight to split water into hydrogen through artificial photosynthesis is a promising approach to convert solar energy into chemical energy and to sovle the energy and environmental problem. A visible-light-driven photoelectrochemical cell can achieve this goal, water oxidation is considered a bottleneck in this process. It has been a hotspot to creation a reasonable and efficient functional photoanode for water oxidation. In recent, most of catalyst and Photosensitizer were Synthesized using noble metal such as Ru or Ir in functional photoanode,high cost hider the further practical application,thus,it is necessary to an efficient functional photoanode based on Non-precious metals for water oxidation。In this thesis, The tin(Ⅳ) porphyrin dichlorido-5,10,15,20-tetrakis(p-catboxyphenyl)-porphyrinato-tin(Ⅳ)(SnTPPC) was synthesised as photosensitizer.A Ru complex Functional with silane coupling agent(RuC) was synthesised as catalyst, Using the photosensitizer and catalyst via Co-sensitizer, we builted a functional photoanode to driven water oxidation. By using the functional photoanode as working electrode in a three-electrode photoelectrochemical cell(PEC), visible light driven water splitting has been successfully demonstrated in a phosphate buffer solution(pH 6.8), by applying 0.3 V external bias vs Ag/AgCl, a high photocurrent density of more than 180 uA/cm~2 has been achieved.Moreover, Cobalt oxide nanoparticles were synthesised and used as water-oxidation catalysts,a new functional photoanode motified with Cobalt oxide nanoparticles and SnTPPC was created. The functional photoanodes showed more photocurrent density enhancement, achieved photocurrent density 175 uA/cm~2 in a phosphate buffer solution(pH 6.8), by applying 0.3 V external bias vs Ag/AgCland much less decay after motified with Cobalt oxide.