Preparation And Properties Of Cobalt-based Electrode Materials

In the 21st century where technology is booming,people are increasingly dependent on energy,and there is an urgent need to develop new technologies for energy conversion and storage.This technology needs to have high stability,low cost,and environmental protection.Researchers continue to explore,prompting rapid development in this field.In this study,a self-assembled?PAA/PAH-rGO?film was prepared using reduced graphene oxide modified with poly?acrylamide hydrochloride??PAH?and poly?acrylic acid??PAA/PAH-rGO?and loaded with cobalt hydroxide?Co?OH?2?on this film to obtain an inexpensive?PAA/PAH-rGO?x-Co?OH?2 electrode material with high capacitive performance and high catalytic efficiency.The main activities carried out are as follows.?1?A?PAA/PAH-rGO?self-assembled film was prepared using PAH-modified reduced graphene oxide as well as PAA,on which Co?OH?₂ electrodeposition was performed using the constant current method to obtain?PAA/PAH-rGO?x-Co?OH?₂flexible electrode material.It was found that increasing the number of layers of LbL and prolonging the electrodeposition time can improve the electrochemical performance of the samples,among which the best electrochemical performance of the samples prepared using the intercalation method?LbL-CP-LbL?combined with LbL and constant current electrodeposition,using Co?NO3?2 as the Co source for electrodeposition.?2?In the capacitance test,the face capacitance of the sample?PAA/PAH-rGO?-15-Co?OH?₂-70 is 10 mF/cm² at a sweep speed of 100 mV/s and 3 mF/cm² at a current density of 0.1 mA/cm².The results of the OER experiment show that?PAA/PAH-rGo?15-Co?OH?₂-70 can reach the current density of 10 mA/cm² as quickly as possible.At this time,the overpotential value of the material is 350 mV,which is better than reported in the literature.The similar Co?OH?₂ material has a lower Tafel slope value,only 111mV/dec.?3?The larger the capacitance value of the?PAA/PAH-rGo?x-Co?OH?₂ flexible electrode,the more active substance is loaded on the surface,providing more active sites to bind to the dye molecules in solution and adsorb more dye molecules in solution in the same amount of time.?4??PAA/PAH-rGo?x-Co?OH?₂ flexible electrode allows efficient water electrolysis under battery independent drive.After charging the?PAA/PAH-rGo?x-Co?OH?2 sample,the fibrous surface environment is unsuitable for bacterial growth and produces an antibacterial effect.