镍钴/碳气凝胶的制备及电催化析氧性能研究

Preparation of Nickel-Cobalt/Carbon Aerogels and Their Electrocatalytic Oxygen Evolution

以海藻酸钠为原料,通过溶胶-凝胶合成法得到不同镍钴比例海藻酸水凝胶,然后通过不同温度的煅烧处理,得到不同比例镍钴/碳气凝胶电极催化剂。采用X-射线衍射(XRD)和扫描电子显微镜(SEM)等手段对产物的结构和形貌进行表征。通过电化学测试研究了各样品的电催化析氧性能和稳定性。结果表明,镍钴质量比为1∶5,275℃温度下的样品电催化析氧性能最好。

Alginate hydrogels were obtained by sol-gel synthesis method using sodium alginate as raw material,which were calcined at different temperature to obtain different nickel-cobalt/carbon aerogel catalysts.The structure and morphology of the products were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The electrocatalytic performance and stability of the samples were investigated by electrochemical test.The results show that the sample with the ratio of nickel and cobalt is 1∶5 obtained at temperature of 275℃shows best electrocatalytic performance for oxygen evolution.