Functional Modification Based On Carbon Dots And The Application In Moisture Enabled Electric Generation

After China has set a clear goal for the“dual carbon”strategy,the development of sustainable clean energy has significant practical and strategic value for achieving a low-carbon economy and carbon neutrality in China.Researchers have developed a series of sustainable energy conversion technologies,such as solar,wind,and tidal energy.However,these energy conversion devices often require a significant amount of funding and human resources and are constrained by environmental factors such as weather,day and night,and geography.Recently,atmospheric moisture harvesting has emerged as a novel energy conversion method that can directly convert energy from the moisture in the environment into electricity without producing any pollutants or harmful gases.Currently,the main core material for moisture harvesting is graphene oxide,which has difficulties in large-scale production,high cost,and uncontrolled pore structures,making it unsuitable for mass applications.This paper designed and synthesized a series of new MEG devices based on carbon dots materials with effective control,studied the effect of different surface-functionalized groups of carbon dots on ion transport in the device,and explored the correlation between different carbon dots and battery performance in depth.In this paper,the flexible paper material with porous structure as the substrate and modified carbon point as the core material are used to prepare the flexible moisture power generation device based on carbon point material,and the work is carried out in the following three aspects:（1）Make full use of the advantages of low cost,simple synthesis and green environmental protection of carbon point materials,and improve the power generation performance of carbon point materials by modifying them with acid functional groups,the main way is to functionalize the surface of carbon dots by adding 1,5-dinaphthalenesulfonic acid to the original carbon dots.Studies have shown that using modified carbon dot materials as the core materials for wet gas power generation can significantly improve the power generation performance of the devices.The resulting wet gas power generation device can obtain a continuous voltage output of 380 m V for more than 1000 seconds.Using porous paper materials with excellent thermal insulation performance（such as filter paper）as the paper-based substrate,it has good flexibility while obtaining excellent electrical production performance,which is conducive to the application of various environments.（2）Using citric acid and urea as core materials,the original carbon dots were synthesized by one-step microwave method,and the surface acidic functional group modification was realized by adding 1,5-dinaphthalenesulfonic acid.The experimental results show that the modified carbon dots can effectively improve the power generation performance of the wet gas power generation device,and the prepared device can stably output a voltage of 380 m V for more than 1000 seconds.In addition,we chose porous paper materials with good thermal insulation properties,such as filter paper,as the paper-based substrate.The manufactured devices not only have excellent power production performance,but also have good flexibility,which can be used in various environments.（3）By designing phytic acidified carbonized polymer dots and heterogeneous electrode structures,all-weather applicable,efficient and integrable carbon polymer dots（CPDs）-based MEGs were developed.Through one-step hydrothermal method,using glucose and phytic acid as core materials,a new type of carbon polymer points rich in phosphate groups（PA-CPDs）were designed and synthesized.PA-CPDs have high ionizing and hygroscopic properties,giving them the ability to produce electricity at low air humidity.At the same time,the active liquid metal electrode is introduced to produce a heterogeneous electrode structure,which effectively improves the electrical performance of the MEG device.At 85%air humidity,the device is stable and stable,with an output voltage of up to 0.8 V,a current density of 1.6 m A cm^-2,and the current and power density(1312μW cm^-2)currently recorded in the field of wet gas power generation.Even at low air humidity of 15%,the device provides 0.65 V and a current output of 12μA^-2,demonstrating round-the-clock operation.With the help of CPDs printability,large-scale integration of devices is achieved through screen printing,and 210 V and 40 m A power outputs are obtained,and commercial microelectronic devices are successfully powered.