【作者】 张青青； 苏耿； 李傲生； 刘开宇；

【Author】 ZHANG Qing-qing~1,SU Geng~(1,2),LI Ao-sheng~1,LIU Kai-yu~1 (1.College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China; 2.State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

【机构】 中南大学化学化工学院； 中南大学粉末冶金国家重点实验室；

【摘要】 采用固相法,以Co（NO₃）₂·6H₂O和NH₄HCO₃为原料,制备了Co（OH）₂CO₃前驱体,在温度300℃煅烧3h后得到Co₃O₄纳米材料。采用X射线衍射（XRD）,透镜扫描（TEM）等手段对产物的微观组织结构和表面形貌进行了表征;采用循环伏安（CV）和恒流充放电方法对其修饰AB₅型储氢合金电极的电化学性能进行了测试。结果表明,所制备产物为立方相结构的类球形Co₃O₄,平均粒径为12nm左右;添加Co₃O₄的储氢合金电极放电容量和循环稳定性均得到了提高,最大放电比容量达334.8mAh/g,与空白电极相比提高了29.7mAh/g,循环100次后比容量保持有313mAh/g,容量保持率为93.48%。更多还原

【Abstract】 The precursor Co（OH）₂CO₃ was synthesized by solid state reaction using Co（NO₃）₂.6H₂O and NH₄HCO₃ as raw material,then nano-Co₃O₄ materials was obtained after sintering the precursor.The microstructure and surface morphology of product was characterized by X-ray diffraction（XRD） and transmission electron microscopy（TEM）.The effects on the electrochemical performance of AB₅-type rare earth based hydrogen storage alloy were investigated by cyclic voltmmetry（CV） and constant current charge-discharge test.The results demonstrated that the product is spherical Co₃O₄ with the particle size of 12nm,and the structure of Co₃O₄ is cubic.The discharge capacity and cyclability of alloy electrodes with Co₃O₄ are increased.After adding the Co₃O₄,the electrode displayed a maximum discharge capacity of 334.8mAh/g,29.7mAh/g higher than biank electrode.The discharge capacity of the electrode with Co₃O₄ retained 313mAh/g after 100 cycles,with a capacity retain rate of 93.48%.更多还原