Proton conduction in La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(3-α) ceramic prepared via microemulsion method and its application in ammonia synthesis at atmospheric pressure

摘要

The popular electrolyte of La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(3-α) was prepared via microemulsion method by using (NH_4)_2CO_3-NH_4OH as the co-precipitation reagent, followed by calcination and sinteration in air. The sintered ceramic was characterized by scanning electron microscopy (SEM) and powder X-ray diffraction (XRD) methods. The conduction behaviors in La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(3-α) were investigated by using the electrochemical methods including gas concentration cells and electrochemical hydrogen permeation. The results indicate that the charge carriers in La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(3-α) are protons under hydrogen atmosphere. Ammonia was synthesized at atmospheric pressure successfully by using La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(3-α) as solid electrolyte for the first time.