【摘要】 以KMnO₄为锰源、CO（NH2）2为还原剂,通过水热反应制备MnO₂,考察了体系酸度对产物结构和形貌的影响,应用X-射线衍射、扫描电镜和N2吸-脱附技术对产物进行表征。结果表明,在0～1 mol/L H2SO4溶液中,制备了颗粒状、球形、纤维状和海胆状MnO₂,前两种MnO₂为层状结构,后两种MnO₂具有隧道结构。海胆状MnO₂的比表面积高达95 m2/g。电化学测试结果显示,在0. 1 A/g的电流密度下,海胆状MnO₂首次放电比容量达到1318. 8 m Ah/g。恒流充放电140次后,容量保持率为74%。更多还原

【Abstract】 MnO₂ were prepared by hydrothermal method using KMnO₄ as a manganese source and CO（ NH2）2 as a reducing reagent. The effects of acidity on structure and morphology of products were investigated. The obtained products were characterized by X-ray diffraction,scanning electron microscopy and N2 adsorption-desorption. Results show that MnO₂ with different morphologies of particles,spheres,fibres and urchins were successfully prepared in 0-1 mol/L H₂SO₄ solution. The former two kinds of MnO₂ are layered structure,while the latter two kinds of MnO₂ are tunnel structure. And MnO₂ urchins have high specific surface area（ 95 m2/g）. Electrochemical measurements indicate MnO₂ urchins exhibit an initial discharge capacity of 1318. 8 m Ah/g at the current density of 0. 1 A/g. And the capacity retention reaches 74% after 140 cycles.更多还原