Porous Ni-Co bimetal oxides nanosheets and catalytic properties for CO oxidation
Porous Ni-Co bimetal oxides nanosheets and catalytic properties for CO oxidation
复制标题
多孔镍钴双金属氧化物纳米片及其对CO氧化的催化性能
DOI：
10.1016/j.jallcom.2013.04.053
复制
发表时间：
2013-10-15
影响因子：
6.2
通讯作者：
Chen, Biaohua
中科院分区：
文献类型：
--
作者：
Gou, Ye;Liang, Xin;Chen, Biaohua
在油胺辅助合成体系中，通过调节钴镍摩尔比，得到了一系列镍钴氢氧化物纳米片。通过在400 ℃下直接热分解相应的氢氧化物，得到了组成可调的多孔Ni-Co氧化物纳米片。对这些镍钴氧化物的物理化学性质进行了全面的表征和分析。与纯NiO和Co_3O_4相比，Co_3O_4/NiO复合氧化物对CO的氧化具有更好的催化性能。随着反应体系中Co含量的增加，所制备的Ni-Co双金属氧化物体系可分为三种不同的晶体结构类型。当Co含量小于20%时，样品具有与纯NiO相同的立方晶体结构，比表面积和催化性能较好。当Co含量在40%~ 60%之间时，样品倾向于形成稳定的NiCo 2 O 4片层结构。当Co含量大于80%时，Ni-Co氧化物的晶体结构类型为Co 3 O 4型。(c)2013爱思唯尔有限公司版权所有。
Series of Ni-Co bimetal hydroxides nanosheets have been obtained by tuning the molar ratio of cobalt and nickel in an oleylamine assisted synthetic system. Porous Ni-Co bimetal oxide nanosheets with tunable compositions have been obtained by directly thermal decomposition of corresponding hydroxides at 400 degrees C. The physicochemical properties of these Ni-Co bimetal oxides have been fully characterized and analyzed. Compared with pure NiO and Co3O4, the bimetal oxides show better catalytic performance for CO oxidation. By increasing Co content in the reaction system, the as-prepared Ni-Co bimetal oxides system can be classified into three different crystal structure types. When Co percentage is less than 20%, the samples display identical cubic crystal structure with pure NiO and possess higher surface area and better catalytic performance than others. As Co percentage in the system is between 40% and 60%, the samples tend to form a stable lamellar structure of NiCo2O4. Co3O4 based crystal structure type of Ni-Co bimetal oxides is observed when Co percentage is more than 80%. (c) 2013 Elsevier B.V. All rights reserved.