Preparation Of Z-type G-C₃N₄/Pt/TiO₂ Nanotube Array Composite Electrode And Study On Its Performance Of Photoelectric Oxidation Of Methanol

With the increase of population and the application technology.The energy demand increases sharply.The extensive use of fossil fuels causes some problems;such as:enrironmental pollution global warming.To solve these problems,fuel cells are nice options.The use of methanol as a fuel is becoming more and more popular because it’s easy to store and handle.And the fuel of direct methanol fuel cell（DMFC）can be easily oxidized to CO₂and H₂O.It provides a new way to store and transfer energy.Recent years,the synthesis of anode electrocatalysts with high activity and durability for methanol oxidation reaction is one of the research hotspots.The production of anode electrocatalysts with high efficient and effective catalytic methanol oxidation reaction performance is crucial for the wide commercialization of DMFC.Therefore,the major objective of this research is to prepare a new type of catalyst with good photoelectric catalytic activity.Considering vanious factors to help research in finding new catalysts:the introduction of support materials especially the morphology with nanostructures.Supporting precious metals can help to achieve catalysts with enhanced conductiritys larger specific surface area,and better stability.The sunergistic effect producd by the combination not only promotes the better performance of existing catalyst materials but also helps promote the synthesis of new materials with the best performance and quality.In addition,the durability of mental and support composites will be improved,which enables them to be used in practical future applications of DMFC.In this paper,suitable TiO₂ nanotube arrays（TiO₂NTs）are selected as the carrier for the noble metal Pt,and g-C₃N₄is introduced to construct a Z-type g-C₃N₄/Pt/TiO₂NTs material and perform physical characterization,electrochemistry and photoelectricity.Characterization of chemical properties.The main research contents are as follows:Load platinum nanoparticles on titanium dioxide nanotubes,and then prepare g-C₃N₄nanosheets by blowing dicyandiamide with NH₄Cl as a gas template,and then load them on Pt-TiO₂nanotube arrays（Pt/TiO₂NTs）by drip coating.A new type of Z-type g-C₃N₄/Pt/TiO₂NTs composite electrode material was prepared.Various common material characterization methods are used to characterize the surface structure of electrode materials.Electrochemical and photoelectrochemical methods are used to study the performance characteristics of materials.The results of the study show that under visible light irradiation,the g-C₃N₄/Pt/TiO₂NTs composite material has an efficient performance of photoelectric oxidation of methanol.There are two main reasons for the high performance of g-C₃N₄/Pt/TiO₂NTs composite materials:i)The combination of g-C₃N₄and Pt-TiO₂NTs effectively expands its absorption in the visible light range;ii)Z-type charge transfer makes the reduction ability strong The electrons and holes with stronger oxidizing ability are retained,so that the photogenerated intermediate acts on the electrocatalytic process to enhance the efficiency of methanol oxidation.