A comprehensive study of hydrogen production from ammonia borane via PdCoAg/AC nanoparticles and anodic current in alkaline medium:experimental design with response surface methodology

摘要

In this paper,the optimization of hydrogen(H2)production by ammonia borane(NH3BH3)over PdCoAg/AC was investigated using the response surface methodology.Besides,the electro-oxidation of NH3BH3 was determined and optimized using the same method to measure its potential use in the direct ammonium boran fuel cells.Moreover,the ternary alloyed catalyst was synthesized using the chemical reduction method.The synergistic effect between Pd,Co and Ag plays an important role in enhancement of NH3BH3 hydrolysis.In addition,the support effect could also efficiently improve the catalytic performance.Furthermore,the effects of NH3BH3 concentration(0.1-50 mmol/5 mL),catalyst amount(1-30 mg)and temperature(20℃-50℃)on the rate of H2 production and the effects of temperature(20℃-50℃),NH3BH3 concentration(0.05-1 mol/L)and catalyst amount(0.5-5 jiL)on the electro-oxidation reaction of NH3BH3 were investigated using the central composite design experimental design.The implementation of the response surface methodology resulted in the formulation of four models out of which the quadratic model was adjudged to efficiently appropriate the experimental data.A further statistical analysis of the quadratic model demonstrated the significance of the model with a pvalue far less than 0.05 for each model and coefficient of determination(R2)of 0.85 and 0.95 for H2 production rate and NH3BH3 electrroxidation peak current,respectively.