Study On The Photoelectrochemical Performance Of Graphene-based Metal Tetraphenylporphyrin Composites And Their Characterization Of Structure And Morphology

As a kind of novel carbon nanomaterial, graphene has attracted enormous attention which possesses the superiority to the fields of dye-sensitized solar cell, energy storage materials, Li-ion battery, and so on. These derivatives of metal porphyrin have similar structure with chlorophyll which has excellent photoelectric conversion efficiency. Therefore, metal porphyrin may be high-performance photoelectric conversion materials after successfully combined with graphene. In this work, graphene/metal tetraphenylporphyrin was prepared through a novel chemical method and characterized by photoelectrochemical measurements. All special details as follows:1. The design and preparation of graphene-based metal tetraphenylporphyrin compositesFirst and foremost, pyrrole and formaldehyde were synthetized by condensation polymerization which definitively formed the tetraphenylporphyrin. Secondly, the as-obtained product, tetraphenylporphyrin, underwent a complexation to come into being metal tetraphenylporphyrin. Eventually, with the help of conjugation effect between graphene and metal tetraphenylporphyrin, this composite can be obtained by reducing the oxygen-containing functional groups via a traditional solvothermal method. All structure and morphology measurements indicate that graphene influences the formation of metal tetraphenylporphyrin particles.2. Photoelectrochemical performances of graphene-based metal tetraphenylporphyrin compositesIn this work, we study the photocurrent, photovoltage and impedance of the composite. We found that the graphene enhanced the absorbance, lowered the resistance and improved the photocurrent responses. All these phenomena included improving the separation of charge carrier and hole, enhancing the ability of electron transfer can be attributed to the synergistic effect.