Research On Electrochemical Performance And Catalytic Application Of Pt-ni/mwcnts Complex

Glucose as a kind of common biomass fuel, its source widely, produced by the part of energy crops and agricultural activity of biomass, is a kind of clean, non-toxic, non-flammable, low cost and easy to produce and store the energy. The chemical energy of biomass can be directly converted into electrical energy by the fuel cell, which can reduce the consumption of fossil fuels. Due to their high efficiency, little pollution to the environment etc. in the increasingly scarce environmental resources, environmental problems are becoming more and more serious now, the development of fuel cell has been developed rapidly.The enzyme free glucose sensor has the advantages of simple preparation and high stability, which has become a hot spot in the research field of glucose sensor. The catalytic properties of platinum modified electrode for glucose have the advantages of high sensitivity with wide linear range. But the platinum electrode surface is easy to adsorb the intermediate product and make the electrode poisoning. The doping of nickel is beneficial to improve the anti poisoning ability of Pt. The catalyst loading on the carrier material can effectively reduce the agglomeration, resulting in a synergistic effect between the platinum and the non noble metals, and improve the electrocatalytic activity of the catalyst.Direct glucose alkaline fuel cell with inorganic metal catalytic materials as the catalyst for catalytic oxidation of glucose. The high electrocatalytic activity and electrochemical stability of Pt based metals have good electrocatalytic activity for the oxygen reduction reaction(ORR) in acid and alkaline fuel cells. The nano materials are often used in combination with the carrier for direct glucose alkaline fuel cells. Through the load on the carbon carrier more effective dispersed platinum metal catalyst system, to reduce the amount of the noble metal platinum in order to make full use of the catalytic properties of platinum, with less susceptible to poisoning, stability and other advantages.In this paper, Pt Ni supported on multi walled carbon nanotubes composite catalysts(Pt-Ni/MWCNTs) were prepared and applied to the non enzymatic glucose sensor and the direct alkaline glucose air cathode fuel cell.The dissertation mainly includes the following parts:(1) The composite catalysts of platinum nickel supported on multi walled carbon nanotubes(Pt-Ni/MWCNTs) by solution reduction method. The composite catalyst modified glassy carbon electrode was used for the detection of glucose. Platinum and nickel particles are uniformly loaded on carbon nanotubes. The modified electrode in alkaline conditions of glucose electrocatalytic properties, showed a rapid electron transfer and test the resulting modified electrode for glucose exhibits wide linear range, excellent selectivity, stability and repeatability.(2) Pt-Ni/MWCNTs composite catalyst modified glassy carbon film electrode as anode and Air cathode film electrode assembly as cathode to build a direct alkaline glucose fuel cell with air cathode fuel cell device. The fuel cell electricity generation performance in different anode catalyst density, cathode catalyst density, anode catalyst area, electrolyte glucose and potassium hydroxide concentration, electrolyte pre processing temperature influencing factors was tested. The influence of the above factors on the performance of the glucose fuel cell was studied and determined the optimal operating conditions for a fuel cell. The performance of the direct alkaline glucose fuel cell was tested under the optimum conditions. It has higher open circuit voltage and higher power density compared with the same type of glucose fuel cell.