Construction And Application Of Photothermal Collaborative Interface Catalysis System

In the face of the current situation of the world energy crisis,and in the context of China’s carbon neutral and carbon peak policy,the transition of energy use from traditional energy to renewable clean energy is particularly important.As a clean energy with high efficiency and high calorific value,hydrogen energy is a potential fuel energy substitute.The extensive use of hydrogen requires the coordination of hydrogen production,transportation,storage and utilization systems.As an energy storage material,Ammonia borane（NH₃BH₃,AB）has relatively high hydrogen content and excellent stability,and is considered as an important material for storing and releasing hydrogen.The hydrogen content of aminoborane is up to 19.6wt%,and the hydrogen release process is stable and does not produce other pollutants.Many scholars at home and abroad have done a lot of research on the catalytic process of aminoborane,and also developed a variety of catalytic systems.In view of the hydrolysis process of AB,a system of photo-thermal synergetic interfacial catalysis for the hydrolysis of aminoborane to produce hydrogen was designed,and the system was also explored in the treatment of pollutants.The main research contents and achievements are as follows:（1）Hydrogen production from ammonia borane（AB）is usually governed by water activation,which is not only energy intensive but also requires expensive and complicated catalysts.We here propose an integrated photocatalytic–photothermal system that dramatically improves water activation and lowers the transport resistance of H₂ by means of intermediate state water evaporation.This system is constructed by covering nanocomposites（Cu₃P-Carbon Dots-Cu）upon vertically aligned acetate fibers（VAAFs）.As a result of superior hydration effect of VAAFs and local photothermal heating for rapid water evaporation,its hydrogen production efficiency from AB hydrolysis reaches over 10 times the particulate suspension system under solar irradiation.Mechanism analysis reveals that the rapid vaporization of intermediate water promotes the cleavages of O-H bonds in bound water and the adsorption reaction of AB and water molecules at active sites.Therefore,this work provides a novel approach to optimize catalytic reaction in thermodynamics and kinetics for the hydrolysis of AB.（2）In addition to the excellent performance in the hydrolysis of AB to produce hydrogen,the system loaded with catalyst on the vertically arranged acetate fiber also explored the removal process of pollutants in the evaporation process.In the experiment,Cu₃P-Carbon Dots 50-Cu was loaded on VAAFs and treated with PVA to construct a new evaporator.The evaporator has good performance of light and hot water evaporation,and can transfer liquid to the evaporation interface through VAAFs for gas-liquid phase change.In addition,the evaporator can oxidize OPD in the solution to OPDox through the photocatalytic process at the reaction interface during evaporation,thus preventing volatile pollutants from entering the atmosphere.After the catalyst and VAAFs are coated with PVA,the catalytic effect of the evaporator and the adsorption effect of pollutants can also be further improved.This experiment shows the great potential for the removal of pollutants in the process of water evaporation,and also provides ideas for the treatment of other volatile pollutants.