The Application Of High Stability Catalyst In Oxygen Evolution Reaction And Detection

The dissertation is aimed at developing a new method of designing stability electrochemical materials,which use the nickel?Ni?as the basic materials with both superior performance and low-cost.Great efforts have been made to investigate the relationship between structure,material,stability and catalytic performance.The mechanism of enhanced catalyst stability and catalytic performance was elucidated.So further researches will be go on to apply the conclusion in production of diabetic-testing materials.The stability and performance of diabetic-testing can be improved by combining with gel and electronic mediator materials.A new method of preparing the porous microspherical Nitrogen?N?and Phosphorus?P?-co-doped NiFe₂O₄ via hydrothermal had been fabricated.It was further expanded to improve the performance and stability of NP-NiFe₂O₄ that was covered by Single-Walled Carbon Nanotubes?NP-NiFe₂O₄/SWNTs?via ultrasound.Different characterizations confirmed the successful formation of porous structure,doping of N and P and the coverage of SWNTs.The porous structure was built to reduce the mass transfer resistance,N and P were co-doped to increase the active sites and SWNTs was combined to obtain the enhanced conductivity,large specific surface area and better stability.The NP-NiFe₂O₄/SWNTs shows excellent OER activity with small overpotential of 247 mV at10 mA cm^-2,low Tafel slope of 83.6 mV dec^-1.And it can be reused for 1000 cycles without activity loss.The method was further improved to the selection of material and design of structure,as the work was extremely easy to cause pollution and time-consuming.To combine the Laccase with Ni in situ synthesis,making it more in line with the ecological environment,no pollution.Moreover,the elemental EDX mapping reveals the Ni element is distributed evenly.LSCM also showed the existences of Laccase.And its catalytic performance is much better than the reported Laccase-based OER catalyst by electrochemical characterization.Furthermore,it provides a specific strategy to increase stability and improve active sites by combing the Laccase and inorganic.The method was further expolred to improve the stability of enzyme and apply it to actual production based on the above results.This work focus on the preparation of gelling materials K₃[Fe?CN?₆]-GO_X in situ chemical reaction.Different characterizations confirmed the formation of the gel and the distribution of GO_X.The K₃[Fe?CN?₆]-GO_X shows excellent detection performance and tremendous stability.Building and constructing this mood can offer thinging and methods for the dectection of other substrances.