Preparation Of Ordered Porous Materials Based On Co₃O₄, Fe₂O₃ And Their Application In Non-enzymatic Glucose Research On Applications In Sensing And Supercapacitors

Ordered porous materials are of great importance to act as promising materials in the fields of energy storage and conversion,electrocatalysis,and electrochemical sensing because of their high specific surface area,large pore volume,and three dimensional(3D)interconnected regular pore channel structures.The high specific surface area can provide a large number of active sites for electrochemical reactions.Moreover,the large pore volume offers abundant space for redox products.Furthermore,the ordered interconnected regular pore channel structure can facilitate the transport of electrolyte.Iron-based(Fe,Co,Ni)metal oxides have attracted wide attention in electrochemical fields due to their own chemical properties,environmental friendliness,and low cost.In this paper,we mainly study the synthesis of ordered porous Co3O4,ordered porous carbon/Co3O4 composites,and ordered porous carbon/Fe2O3 composites,and their applications about non-enzymatic glucose sensing and supercapaciors.The details are as follows:Using KIT-6 mesoporous SiO2 and densely packed porous solids assembled by SiO2 microspheres with different sizes as the hard template and cobalt nitrate hexahydrate as the precursor,ordered porous Co3O4 materials with different pore sizes were prepared via thermal decomposition method.Using densely packed porous solids assembled by SiO2 microspheres with different sizes as the hard template and low molecular weight phenolic resins as carbon source,ordered porous carbons with different pore sizes were prepared.Furthermore,Co3O4@C composites(the mass ratio of Co3O4 and ordered porous carbon were about 2:1)were synthesized by using ordered porous carbon as the carrier and cobalt nitrate hexahydrate as the precursor.The XRD and TEM results showed that the Co3O4 in porous carbon channels was composed of nanoparticles.Fe2O3@C composites(the mass ratio of Fe2O3 and ordered porous carbon was about 2:1)were prepared by using porous carbon with different pore size as the carrier and iron nitrate nonahydrate as the precursor.The XRD and TEM results showed that Fe2O3 loaded in porous carbon channels possessed an amorphous structure.The related materials were applied in non-enzymatic glucose sensors.Non-enzymatic glucose sensing properties of porous Co3O4 materials with different pore sizes were investigated.Electrochemical test results showed that the current-time response enhanced increasingly with the increase of the pore size.Thus,the pore size was the main factor that affects the sensing performance of the sample.Furthermore,the non-enzymatic glucose sensing performance of Co3O4@C composites was also investigated.From the electrochemical test,current-time response also enhanced increasingly with the increase of average pore size of the composites.The related materials were also applied in supercapacitors.The performances of porous Co3O4 materials with different pore sizes for supercapacitors were investigated.Electrochemical test results showed that both the pore size and BET specific surface area had significant effects on the electrochemical performance.In addition,the supercapacitive properties of Co3O4@C composites were also investigated.The result showed that Co3O4@C c=composites exhibited better performance than single Co3O4.For Co3O4@C composites,the average pore size of the composites and the thickness of the loading Co3O4 layer in porous carbon channels had important effects on the perfomance of the supercapacitor.Finally,the supercapacitive properties of Fe2O3@C composites were also investigated.Electrochemical test results showed that the relevant variation trends were consistent with that of Co3O4@C composites.