球形硒化镍颗粒催化及电化学性能研究

Study about catalytic and electrochemical performance of sphere-like NiSe particles

采用水热法一步合成纯NiSe材料,由XRD、扫描电镜以及氮气吸脱附性能等测试结果表明,所制备粉体是由纳米颗粒二次团聚构成的直径为700 nm左右、具有高比表面积(1156 m^2·g^(-1))和丰富孔(孔尺寸为30 nm左右)结构的球形纯NiSe。室温下,NiSe在催化水合肼分解过程中表现出高的催化活性,50 min内实现水合肼的完全分解;作为锂离子电池负极材料,NiSe材料也表现出较高的电化学活性,前30次充放电循环中比容量基本保持在440 mAh g^(-1)左右。

Pure NiSe particles were successfully prepared via hydro-thermal method.XRD,SEM and BET techniques were used to characterize its physical performance.The results showed that sphere-like NiSe clusters with the diameter of 700 nm were assembled by nano-size particles and have high BET ratio-surface area(1156 m2·g-1)and rich pores(the pore diameter of about 30 nm).NiSe exhibits outstanding catalytic performance for decomposition of hydrazine hydrate at room temperature.Interestingly,it is found that NiSe also shows good electrochemical performance when it is used as anode active material of LIBs.Specific capacity of 440 mAh·g-1 is sustained during the first 30 charge-discharge cycles.