联咪唑修饰{SiW_(12)O_(40)}杂化物的合成及超级电容性能  

Synthesis and Supercapacitor Properties of Biimidazole-modified{SiW_(12)O_(40)}Hybrid

作　　者：梁宇 刘欢 宫丽阁 王春晓[1] 王春梅 于凯[1] 周百斌[1] LIANG Yu;LIU Huan;GONG Lige;WANG Chunxiao;WANG Chunmei;YU Kai;ZHOU Baibin(Key Laboratory of Photonic and Electronic Bandgap Materials,Ministry of Education,School of Chemistry and Chemical Engineering,Harbin Normal University,Harbin 150025,China)

机构地区：[1]光电带隙材料教育部重点实验室,哈尔滨师范大学化学化工学院,哈尔滨150025

出　　处：《高等学校化学学报》2022年第1期40-48,共9页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21571044,21771046);中央支持地方高校改革发展基金(批准号:1401120002);黑龙江省自然科学基金(批准号:ZD2021B002);哈尔滨师范大学优秀科研团队基金(批准号:XKYT2020001)资助~~。

摘　　要：以H_(4)SiW_(12)O_(40)为前驱体,采用水热法合成了联咪唑修饰的超分子杂化物,经元素组成和热重分析,确定其分子式为[Co(bim)_(2)(H_(2)O)_(2)][H_(2)SiW_(12)O_(40)]·2H_(2)O(bim=联咪唑)(1).单晶衍射分析表明,该杂化物是由[H_(2)SiW_(12)O_(40)]_(2‒)、[Co(bim)_(2)(H_(2)O)_(2)]_(2+)和2个H_(2)O组成,各组分之间通过氢键或超分子作用形成一维(1D)~三维(3D)结构.分别以玻碳、碳布和泡沫镍为集流体的三电极体系,当电流密度为1 A/g时,杂合物1的比电容分别为350.09,107.02和186.83 F/g;5000次循环后,电容保持率分别为94.5%,92.8%和95.1%.动力学分析显示,该化合物的电荷存储机制是以表面控制电荷为主.在对称纽扣电池体系中,当电流密度为1 A/g时,其比电容为80.00 F/g;在0.75 V的电压窗口中,功率密度为130.83 W/kg时,其能量密度为9.41 W·h/kg;5000次循环后,电容保持率为92.4%,表明合成的杂化物是一种较好的超级电容器电极候选材料.H_(4)SiW_(12)O_(40) was used as a precursor to synthesize biimidazole-modified supramolecular hybrid under hydrothermal condition,and its chemical formula was determined to be[Co(bim)_(2)(H_(2)O)_(2)][H_(2)SiW_(12)O_(40)]·2H_(2)O(1)(bim=biimidazole)by elemental composition and thermal gravity(TG)analysis.Single-crystal diffraction analysis shows that,the compound is composed of[H_(2)SiW_(12)O_(40)]^(2‒),[Co(bim)_(2)(H_(2)O)_(2)]^(2+)and two H_(2)O.At the same time,the components form 1D to 3D structures through hydrogen bond and supramolecular interaction.Using glassy carbon,carbon cloth and nickel foam as the current collectors,when the current density is 1 A/g,in the three-electrode system,compound 1 shows the specific capacitance(350.09,107.02 and 186.83 F/g),better than most literature reports,and with capacitance retention of 94.5%,92.8%and 95.1%after 5000 cycles.The kinetic analysis shows that the charge storage mechanism of the compound is dominated by surface-controlled electric charges.And simulataneously in the foamed nickel two-electrode system,the compound shows the specific capacitance 80.00 F/g at 1 A/g current density,an energy density of 9.41 W·h/kg for a power density of 130.83 W/kg in a voltage window of 0.75 V,and an outstanding cycle stability with 92.4% capacitance retention after 5000 cycles. It is shown that the synthetic hybrid is a better candidate material for supercapacitor electrodes.

关 键 词：多金属氧酸盐 [SiW_(12)O_(40)]^(4‒) 水热合成 超级电容性能 

分 类 号：O614[理学—无机化学]