以Ti2 AlC为前驱体、LiF-HCl的水溶液为刻蚀液、KMnO4为氧化剂和锰源,采用溶液-沉积法制备了δ-MnO2/Ti2 CTx复合电极材料.分别采用X-射线衍射仪、扫描电子显微镜、拉曼光谱等方法对试样进行了表征;以镍网为对电极、银/氯化银为参比电极、2 mol·L-1 KOH溶液为电解质溶液,在3电极体系中采用循环伏安、恒流充放电和交流阻抗等电化学方法研究了复合材料的电化学性质.结果表明:当δ-MnO2/Ti2 CTx复合电极材料在电流密度为1 A·g-1时,复合材料的比电容高达227 F·g-1.δ-MnO2/Ti2 CTx是一种性能良好的电化学电极材料,具有潜在的应用前景.
以Ti2AlC为前驱体,以盐酸与氟化锂的溶液为刻蚀剂,在40℃磁力搅拌条件下,刻蚀48 h制得Ti2CTx材料.分别采用N2吸附/脱附、X-射线衍射、拉曼光谱、扫描电子显微镜、能量色散X-射线光谱仪和透射电镜等方法对试样的比表面积、孔分布、晶相结构、形貌特征等物理性质进行了表征;用循环伏安、恒流充放电和交流阻抗等电化学方法研究了Ti2CTx材料在2 mol·L-1 KOH溶液中的电化学特性.实验结果表明:Ti2CTx是2维层状材料,在电流密度为1 A·g-1时,该材料的比容量为119 F·g-1,经10000次充放电循环后,比容量保留率为98％,且保持较高的库伦效率.
Different initiators were used to initiate the grafting polymerization of sodium alginate (SA) and temperature-responsive poly(N-vinylcaprolactam) (PVCL). When AIBN was taken as an initiator, the grafting (G) and grafting efficiency (GE) obtain the maximum, and the influences of reaction conditions on degree of G and GE have been studied. The results show that when C(I) is 6×10 -3 mol/L, t is 5h, m(VCL):m(SA) is 2:1 the GE of the monomer obtains the maximum. The chemical structure of prepared SA-graft-PVCL(SA-g-PVCL) was verified by infrared spectrometry (FT-IR) and TG analysis. Turbidity study reveals that grafted sodium alginates have good temperature-sensitivity.
