摘要
本文以Na2S,S,FeSO4为反应物,通过调节溶液的pH值和反应温度,采用水热法合成了具有立方体形貌的黄铁矿型FeS2材料。采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)等手段对合成的FeS2材料进行了表征。在温度为500℃,相对湿度RH<1%的条件下,测试了其单体热电池的放电性能。XRD测试结果表明当1≤pH≤4时,产物为白铁矿和黄铁矿的混合物;当5≤pH≤11时,产物为单相黄铁矿。当反应温度T=95℃时,产物为白铁矿和黄铁矿的混合物;当反应温度110℃≤T≤200℃,产物为单相黄铁矿。SEM测试结果表明随着温度的增加,产物的粒径也随之增加,在140℃温度条件下合成了具有立方体形貌的颗粒。当1≤pH≤5,产物颗粒的形貌不规则,并且粒径的均一性差;当9≤pH≤12,产物颗粒具有立方形貌,粒径的均一性好;放电测试结果表明合成的单相黄铁矿FeS2材料可以降低浓差极化,提高材料的比容量、比能量。
The single phase pyrite has been successfully prepared via the reaction of FeSO4 · 7H2O, S and Na2S · 9H2O using hydrothermal method. Discharging experiments of single cell thermal battery made of synthetic pyrite were conducted at the condition of T = 500℃, relative humidity RH 〈 1%. The X-ray powder diffraction （XRD） and scanning electron microscope （SEM） were used to study the prepared FeS2. The XRD rusuhs show that when 1 ≤ pH ≤ 4, the products are mixtures of pyrite and marcasite. When 5 ≤pH≤11, the synthesized FeS2 is single phase pyrite. At T = 95 ℃, the products are mixtures of pyrite and marcasite. When 110℃≤T≤200 ℃, the synthesized FeS2 is single phase pyrite. The SEM results revealed that the diameters of the synthetic FeS2 particles increasing with the temperatures, and pyrite micro-nanocubes were prepared at 140℃. When 1 ≤ pH ≤ 5, the synthetic FeS2 showed irregular morphologies and uneven size distributions. When 9 ≤ pH ≤12, pyrite with cube morphologies were experiments showed natural pyrite. prepared and the pyrite particles owned fine size distributions. Discharging that synthetic pyrite had lower concentration polarization and higher capacities than naturl pyrite.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第9期1896-1900,1907,共6页
Journal of Synthetic Crystals
