Proceedings of nanoGe Fall Meeting19 (NFM19)
Publication date: 18th July 2019
Carbon nitride-based materials (CN) have earned great interest as robust and cheap metal-free semiconductors.[1] CN materials have been used as photo-catalysts due to their tunable band gap, chemical stability and desirable band positions for various reactions such as water-splitting which can be divided to hydrogen and oxygen evolution reactions (HER and OER, respectively).[2] However, the exploitation of CN materials in photoelectrical devices such as photonelectrochemical cells (PEC) is still limited due to the difficulties of growing CN layer with an intimate contact on substrates as well as good control over its properties.[1]
Electrophoretic deposition (EPD) is a facile method to deposit nanoparticles and 2D materials on conductive substrates. The uniqueness of this method stems from the ability to control film thickness by altering the parameters of deposition (e.g., applied electrical field) and the parameters of the solution such as concentration and solvent. EPD has been used previously to deposit as prepared CN powders that formed only physical connection with the substrate.[3] Therefore, the electrodes’ photoelectrochemical activity and stability were low. In the last years, our group has reported the synthesis of CN by using supramolecular assemblies comprise of CN monomers as reactants. This method permits the control over the electrode’s final properties. Here, we purpose for the first time a method to deposit supramolecular assemblies directly on conductive substrates in order to convert them into CN films using a thermal treatment. We demonstrate how altering different supramolecular entities enables the control on the final properties of CN-based photoelectrodes such as morphology, porosity, specific surface area, conductivity, and optical absorbance.
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