Abstract: Direct electrochemical behaviors of nano-MnO2 doped on glassy carbon electrode were investigated.The electrochemical experimental results show that there was a totally irreversible redox peak in the potential of 0.0～0.8 V(vs.SCE) in ammonia / ammonia chloride buffered saline solution(pH=9.48) and the oxidation process was controlled by absorption-diffusion at lower scan speed,the deliver coefficient of cathode was α=0.547 7 and that of anode was β=0.452 3.At high scan speed it was controlled by obsorption.M...