Research On The Synthesis And Application Of Fe And Mo-based Nanomaterials Based On Electrochemical Methods

Transition metal-based nanomaterials have attracted much attention for their excellent catalytic activity and high cost-effectiveness.Among them,Fe and Mo,as trace elements in life,are widely used in biomimetic catalysis,electrocatalysis and other fields because of their environmental friendliness and excellent biocompatibility.Although many achievements have been made in the synthesis methods of nanomaterials,simple,efficient and low-cost synthesis methods are still worth exploring.In this paper,nitrogen-doped carbon-coated iron carbide nanomaterials?Fe₃C/N-C?,molybdenum disulfide quantum dots?MoS₂ QDs?and nanosheets were synthesized by electrochemical method.And explore its application potential in nanozymes to promote wound treatment in vivo,photoluminescence?PL?imaging.A template-free solvothermal method was used to prepare sulfur-doped molybdenum oxide nanosheets with oxygen vacancy?S-MoO_x?and explore its application in electrocatalytic hydrazine oxidation.1.The electrochemical method was used to prepare Fe₃C/N-C with high peroxidase-like activity?POD?.FeSO₄/histidine?His?mixture and graphite rod?C rod?are used as electrolyte and anode,respectively.The formation of Fe₃C/N-C benefits from the specific affinity between His-derived carbon nanodots?CNDs?and iron ions.Fe₃C/N-C nanozyme can decompose hydrogen peroxide?H₂O₂?into hydroxyl radical?·OH?with strong oxidizing ability,and its broad-spectrum antibacterial activity is higher than that of H₂O₂ alone.The peroxidase-like activity of Fe₃C/N-C nanozyme promotes wound healing effectively in mice after bacterial infection.2.Bipolar-electrode?BPE?electrochemical strategy was applied for preparing MoS₂QDs using the MoS₂ powder and PBS as the precursor and electrolyte,respectively.Meanwhile,the corresponding by-product precipitate was studied,in which the MoS₂nanosheets were obtained.Through the various characterizations,we proposed the generation mechanism of the MoS₂ QDs and nanosheets via the BPE electrochemical strategy.The as-prepared MoS₂ QDs exhibited high photoluminescence?PL?quantum yield of 13.9%and average lateral size of 4.4±0.2 nm,respectively.Their excellent PL property,low cytotoxicity,and good aqueous dispersion offer promising applicability in PL staining and cell imaging.Furthermore,the as-obtained by-product containing the nanosheets showed excellent EMW absorption performance,which indirectly proved the defects and phase changes generated during the BPE process.3.The ammonium tetrathiomolybdate??NH₄?₂MoS₄?as the precursor and the aqueous ethanol as reaction solution,an in-situ sulfur-doped molybdenum oxide?S-MoO_x?nanosheets catalyst was designed cleverly by a one-step template-free solvothermal method.In the 1.0 M KOH/0.1M hydrazide?N₂H₄?electrolyte,the initial potential of S-MoO_x was 0.5 V vs.reversible hydrogen electrode?RHE?,showing superior catalytic performance than Mo O_x that synthesized by the same method.In this paper,the transition metal elements Fe and Mo-based materials were used as the objects.Nanozyme antibacterial materials,photoluminescent dyes,and hydrazine oxidation catalysts were synthesized by electrochemical and solvothermal methods.It enriches the types of biomimetic catalysis and electrocatalyst,and provides a new method to solve the practical problems such as antibiotic resistance and low efficiency of hydrogen production by electrolyzing water.