双硬配体修饰的{BW_(12)O_(40)}超分子化合物的水热合成及其超级电容性能  

Hydrothermal synthesis and supercapacitor properties of {BW_(12)O_(40)} supramolecular compound modified by double hard ligands

作　　者：康宁 宫丽阁 王春晓[1] 王春梅 于凯[1] 周百斌[1] KANG Ning;GONG Li-ge;WANG Chun-xiao;WANG Chun-mei;YU Kai;ZHOU Bai-bin(Key Laboratory of Optoelectronic Band Gap 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,黑龙江哈尔滨150025

出　　处：《分子科学学报》2022年第3期250-256,共7页Journal of Molecular Science

基　　金：国家自然科学基金资助项目(21771046);中央支持地方高校改革发展基金(1401120002);哈尔滨师范大学优秀科研团队基金(XKYT2020001)。

摘　　要：以苯并咪唑(biz)、乙二胺(en)为配体,K_(5)[BW_(12)O_(40)]为前驱体水热法合成了一种双硬配体修饰的超分子化合物(H_(2)biz)(Hbiz)[Co(en)_(3)][BW_(12)O_(40)](1).单晶结构分析表明,该化合物是由1个[BW_(12)O_(40)]^(5-)阴离子、1个[Co(en)_(3)]^(2+)片段、单、双质子化的biz构成,并通过氢键或超分子作用形成1D到3D结构.以该化合物为活性物质制成玻碳电极,在电流密度为1 A·g^(-1)时,其比电容是473.15 F·g^(-1).同时,该化合物具有较高的稳定性,5000次循环后保持率达94.7%.标题化合物的电荷存储机制是扩散电荷和表面电荷相互作用.表明合成化合物是一种有实用价值的物质.A double hard ligands modified supramo-lecular compound(H_(2)biz)(Hbiz)[Co(en)_(3)][BW_(12)O_(40)](biz=benzimidazole,en=ethanedia-mine)was synthesized by hydrothermal method with biz and en as ligands and K_(5)[BW_(12)O_(40)]as precursors.The free biz and[BW_(12)O_(40)]^(5-)constitute two kinds of unit cells of the title compound.The arrangement of B unit cell is opposite to that of[BW_(12)O_(40)]^(5-)anion cluster in A unit cell.The 1D chain structure of the title compound is extended through the arrangement of the unit cell structure ABAB.The 1D chains are connected by hydrogen bonds between the[BW_(12)O_(40)]^(5-)anion cluster and the[Co(en)_(3)]^(2+)fragment to form a 2D structure,and the 2D structures are connected by supramolec-ular interaction to form a 3D structure.The standard characteristic peaks in the IR spectra of the title compound all exist and are consistent with the literature.The X-ray diffraction(XRD)image shows that it is in good agreement with the simulation images.TG of the title compound presents one-step weight loss.The loss stage of 16.75%arises within the scope of 315℃to 605℃,attributed to the loss of three en and two biz ligands.Scanning electron microscope(SEM)images show that the mor-phology of the title compound is cubic and its surface is smooth.It can be seen from energy-dispersive X-ray spectroscopy(EDS)and EDX that B,W,O,C,N and Co exist in the crystal and are uniformly distributed in the crystal.All the above results are proved that the target compound was synthesized.The supercapacitor performance of the title compound was tested in a three electrode system using glassy carbon electrode as collector and 1 mol·L^(-1) Na_(2)SO_(4) aqueous as electrolyte.For 1-GCE,the specific capacitance is 473.15 F·g^(-1) at 1 A·g^(-1).At the same time,the title compound has high stabil-ity,and the retention rate reaches 94.7%after 5000 cycles.The resistance before and after cycling is 8.01 and 8.97Ωrespectively,which shows that the resistance increases slightly after cycling,which furth

关 键 词：[BW12O40]5- 多金属氧酸盐 水热合成 超级电容器 

分 类 号：O614[理学—无机化学]