硼氢化钠水解制氢用铂基催化剂的研究

Platinum-based catalysts for hydrogen generation from hydrolysis of sodium borohydride

选用2种高比表面的碳载体,采用浸渍法制备了担载量为20%的铂基催化剂.经表征20%Pt/乙炔黑的孔径主要分布在2.5～5nm之间,孔径小并且分布集中;而20%Pt/珍珠碳的孔径除少量分布在2.5～5 nm之间外,大部分孔径分布在20～60nm,分布范围较宽.在20min内,20% Pt/珍珠碳和20%Pt/乙炔黑的平均制氢速率分别为1.9 L/min和2.3 L/min,当氢的利用率为100%时,可分别为功率为308W和373 W的质子交换膜燃烧电池持续供氢.

Two carbon materials with high surface areas were selected as supports,and carbon-supported platinum catalysts were synthesized by impregnating process.After characterization it is found that the pore diameter distribution of 20% Pt/ acetylene black is just concentrated in the range of 2.5-5 nm,while that of 20% Pt/pearly black is mainly concentrated in the range of 20-60 nm,except for a small amount of the pores distributed in the range of 2.5-5 nm.20% Pt/pearly black and 20% Pt/acetylene black can achieve average hydrogen generation rates of 1.9 L/min and 2.3 L/min,respectively,which can give hydrogen supply for a 308 W proton exchange membrane fuel cell(PEMFC) and a 373 W PEMFC at 100% hydrogen utilization.