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Hydrazine is an important anodic material for fuel cell,and high-energy propellant of rockets military and aerospace industries[1-2].Hydrazine and the derivatives are also compounds of interest in the biology,chemical and pharmaceutical fields[3].Owing to the carcinogenic and hepatotoxic effects of hydrazine,the processing before releasing into the environment become critical to human health.Pd nanoparticles are highly effective electro catalyst for catalyzing the oxidation of hydrazine[4].However,the high cost of noble metal nanocrystals limit their wildly utilisation.Thus,the improving of the mass and specific activity is particularly important.As we known,the atomic arrangements of noble metal nanocrystals with varying facets are different.Which will affect the catalytic activity largely[5-6].Herein,we choose rhombic dodecahedral.octahedral.cubic Pd single-nanocrystalline crystals,which are exclusively enclosed by { 100 },{ 111 },{ 110} facets,as the catalysts to electro-oxidation of hydrazine in the basic solutions.The scanning electron microscopy(SEM)images and surface atomic arrangements models of Pd catalysts are shown in Fig.1.Fig.2 shows the cyclic voltammetry of Pd catalysts in hydrazine solutions.And the currents are normalized with the electrochemically active surface area.This study is significant to decrease the utilization of Pd catalysts in fuel cell,industry productions,and pollutant processes.