High-temperature electrochemical performance of spherical coated with

Spherical Ni ( OH ) 2 coated with Lu ( OH ) 3 was prepared by chemical surface precipitation, and the effects of Lu ( OH ) 3 coating were investigated on the electrochemical performances of Ni ( OH ) 2 electrodes through the constant current charge/discharge and cyclic voltammetric (CV) measurements. It was found that there was more β -NiOOH phase in the charged electrodes using spherical Ni ( OH ) 2 coated with Lu ( OH ) 3 , indicating that the charge efficiency apparently improved at high temperatures due to the Lu ( OH ) 3 coating. The CV results showed that oxygen evolution reaction was effectively restrained. The results proved that the Lu ( OH ) 3 coating an effective method to improve the high-temperature performances of Ni ( OH ) 2 , and the optimum ratio of lutetium was about 0.8 mol%.