TiN/Nb4N5复合多孔粉体制备及其电化学性能研究

Preparation of TiN/Nb_4N_5 Composite Porous Powder and Its Electrochemical Properties

以四氯化钛和五氯化铌为原料,P123为模板剂,氰胺为稳定剂,采用非水解溶胶-凝胶法制得多孔Ti O_2/Nb_2O_5粉体,再经900℃氨气还原氮化得到多孔TiN/Nb_4N_5复合粉体。通过XRD、SEM、EDS、BET和CV等探讨了第二组份Nb用量对TiN/Nb_4N_5复合多孔粉体物相、形貌以及电化学性能的影响。结果发现,由于Nb元素在复合粉体中以Nb_4N_5形式存在,粉体比表面积较大,复合后电极材料的倍率性得以提高,比电容保持率从55%提升到75%。

The porous TiO2/ Nb2O5 powders were prepared by non - hydrolytic sol - gel method, using titanium tetrachloride and niobium pentachloride as raw materials, P123 as template and cyanamide as stabilizer, respectively. The porous TiN/ Nb4N5 powder was synthesized via nitrogen reduction of the mesoporous TiO2/ Nb2O5 powder at 900 益 in NH3. The effects of Nb content on the phase, morphology and electrochemical properties of TiN/Nb4N5 composite porous powders were investigated by XRD, SEM , EDS, BET and CV tests. Since the Nb element was presented in the composite powder in the form of Nb4N5 and the specific surface area of the powder was larger, the magnification of the composite electrode material was improved with the specific retention ratio increasing from 5 5 % to 7 5 % .