Hydrothermal synthesis and electrocatalytic properties of Ni1-xSe(x=0 and 0.15)
Ni1-x Se(x=0 and 0.15)nano-powders were prepared by one-step synthesis using natural plant phenolic acid-gallic acid as reducing agent under mild hydrothermal reaction conditions.Meanwhile,the effects of reaction temperature and solution pH on the composition of the products in hydrothermal reaction were studied.XRD,XPS,SEM,TEM and electrochemical tests were also performed to characterize the hydrothermal products.The results showed that single-phase NiSe could be obtained at temperature of 180℃ and pH=12,whereas at temperature of 200℃and pH=7,single-phase Ni0.85 Se was obtained.Among them,NiSe nano-powders exhibited obvious electrocatalytic activities for the hydrogen evolution reaction,with an overpotential of 398mV,a Tafel slope of 152mV/dec,and good electrocatalytic stability at current density of 10mA/cm2.
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