CoFe2O4-CNTs纳米复合材料的制备、表征及其电催化析氧性能

Study on the changes of microtubule cytoskeleton of abscission zone during leaf abscission in cotton

为了提高钴铁氧化物CoFe2O4的氧析出（OER）电催化活性和电流密度,本研究采用水热法制备钴铁氧化物-碳纳米管纳米复合材料（CoFe2O4-CNTs）;通过热重分析（TG）,得出CNTs的含量为40.2%,并利用X-射线衍射（XRD）、扫描电子显微镜（SEM）和X射线能谱仪（EDS）对复合材料的晶型结构和形貌进行了表征,结果表明CoFe2O4颗粒被均匀的附着在CNTs的表面;在1 mol/L KOH中测试了Co Fe2O4-CNTs纳米复合材料的电催化OER活性与稳定性,并且与没有加入CNTs的CoFe2O4进行了比较,实验结果表明：CNTs的加入能够提高CoFe2O4的OER活性和电流密度,在催化剂中起到模板的作用和加速电子传输作用,增加了水分解OER反应的动力学速度。因此,CoFe2O4-CNTs纳米复合材料是优良的OER电催化剂,有望用于水分解制备氢气体系和燃料电池中。

Leaf abscission is important for plant. It has been known that microtubule extensively participates in plant growth and development, stress responses as well as interaction of plant and environment.In this study, we established a method of immunofl- uoreseence staining to specially observe microtubule cytoskeleton in sclerenchyma of cotton petioles. Then, with the in vitro abscission system, we found that the microtubules in sclerenchyma of non-abscission zone of petiole were generally oriented obliquely during leaf functional period.Whereas the arrangement of microtubules in sclerenchyma of abscission zone of petiole is complicated and variable. In some cells, microtubules were generally oriented obliquely. In some other cells, the arrangement of microtubules is random. During early stage of leaf abscission, the arrangement of microtubules in sclerenchyma of non-abscission zone of petiole changed from oblique to longitudinal, then to oblique again. However, the microtubules in sclerenchyma of abscission zone of petiole depolymerized reversibly during the same period. These results shed light on the relationship between cotton leaf abscission and changes of microtubule of petiole.