中南大学学报（自然科学版）2011，Vol.42Issue(4)：876-883,8.
热分解含氨草酸钴复盐制备纤维状多孔钴粉
Preparation of fibrous porous cobalt powders by thermal decomposition of cobalt oxalate complex with ammonia
摘要
Abstract
A novel precursor of fibrous cobalt powders was synthesized by coordination-precipitation process using ammonia as complex agent. The phase, composition and morphology of the novel precursor were characterized by XRD,IR, DTA/TGA and SEM analysis. The influences of various conditions in pyrolysis, such as decomposition atmosphere,decomposition temperature, decomposition time and heating rate, on the morphology, average size and specific surface area of the cobalt powders were investigated. The results show that the precursors obtained in reaction system Co(Ⅱ )-C2O42--NH3-NH4+-H2O is ammoniacal complex of cobalt oxalate and the morphology is fibrous. The formation of the complex of oxalate cobalt with ammonia precipitated by coordination of ammonia and cobalt reacting with oxalate is quite essential to form fibrous morphology for the precursor, which may be formed through [(NH3)M-OX-M(NH3)] 2+growth units along the axial direction. The fibrous cobalt powders with 10.44 m2·g-1 for specific surface area are produced in weak reducing atmosphere, 623-723 K for decomposition temperature, 30-60 min for decomposition time, 15-20 K/min of heating rate. The structure of pores in cobalt powders is capillary tube with open ports and the majority is mesoporous.关键词
含氨草酸钴复盐/钴粉/纤维状/多孔/生长机理Key words
cobalt oxalate complex with ammonia/ cobalt powders/ fibrous/ porous/ growth mechanism分类
矿业与冶金引用本文复制引用
湛菁,周涤非,张传福,贺跃辉,岳建峰..热分解含氨草酸钴复盐制备纤维状多孔钴粉[J].中南大学学报（自然科学版）,2011,42(4):876-883,8.基金项目
湖南省自然科学基金资助项目(09JJ4028) （09JJ4028）
中国博士后基金资助项目(20070410989) （20070410989）
湖南省科技计划项目(2010FJ3011) （2010FJ3011）
