表面自组装法制备高比容Al2O3/TiO2复合膜

doi:10.15541/jim20170260

无机材料学报 ›› 2018, Vol. 33 ›› Issue (6): 617-622.DOI: 10.15541/jim20170260 CSTR: 32189.14.10.15541/jim20170260

表面自组装法制备高比容Al₂O₃/TiO₂复合膜

王景平¹, 成方媛¹, 杜显锋², 徐友龙²

1. 陕西科技大学化学与化工学院, 西安710021;
2. 西安交通大学陕西省先进储能电子材料与器件工程研究中心, 西安 710049;

收稿日期:2017-05-25 修回日期:2017-11-15 出版日期:2018-06-20 网络出版日期:2018-05-24
作者简介:王景平(1973-), 男, 副教授. E-mail: wangjingping@sust.edu.cn
基金资助:
国家自然科学基金(51201128);陕西省自然科学基金(2016JQ8031);中央高校基本科研业务费专项资金(XJJ2016020);西安市科技计划项目(2017068CG/RC031(SXKD007))

Preparation of Al₂O₃/TiO₂ Composite film with High Specific Capacitance by Surface Self-assembly Method

WANG Jing-Ping¹, CHENG Fang-Yuan¹, DU Xian-Feng², XU You-Long²

1. College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xi 'an 710021, China;
2. Shaanxi Province Advanced Electronic Materials and Devices Engineering Research Center, Xi'an Jiaotong University, Xi 'an 710049, China;

Received:2017-05-25 Revised:2017-11-15 Published:2018-06-20 Online:2018-05-24
About author:WANG Jing-Ping. E-mail: wangjingping@sust.edu.cn
Supported by:
National Natural Science Foundation of China (51201128);Natural Science Foundation of Shaanxi Province (2016JQ8031);State Education Ministry and the Fundamental Research Funds for the Central Universities (XJJ2016020);Xi'an Science and Technology Program (2017068CG/RC031(SXKD007))

摘要/Abstract

摘要：

通过提高工作介质氧化膜的介电常数来增加电容器的比容量, 是解决铝电解电容器小型化、轻量化常用的方法之一。本研究采用表面自组装法, 在铝箔表面引入磺酸基团使铝箔表面的荷电性质发生改变, 铝箔与二氧化钛前驱体胶粒间的静电斥力转变为静电引力, 从而增加了二氧化钛在铝箔表面的沉积量。经过热处理与阳极氧化后, 在铝箔表面形成了高介电常数Al₂O₃/TiO₂复合膜。相对未涂覆TiO₂的阳极铝箔, 采用表面自组装法制备的复合膜表面的钛含量增加了30倍, 其比容量在400 V耐压下提高了44.26%。本方法制备的大比容量阳极氧化铝箔在铝电解电容器行业有巨大的应用潜力。

关键词: 表面自组装, 表面电荷, Al₂O₃/TiO₂复合膜, 铝电解电容器

Abstract:

For anodized aluminum, the enhancement of the specific capacitance foils by increasing dielectric constant is one of the most common methods to meet the requirements of miniaturization and lightweight of aluminum electrolytic capacitors. In this study, surface self-assembly method was used to introduce sulfonic acid group to graft the surface of aluminum foil for changing its electrical properties. Electrostatic repulsion between surface of aluminum foil and colloidal particles of titanium dioxide was changed to electrostatic forces due to the existence of sulfonic acid group, which dramatically enhanced the deposition of titanium dioxide on the surface of the aluminum foil. After heat treatment and anodic oxidation of aluminum foil, the Al₂O₃/TiO₂compounds with high dielectric constant on the surface of aluminum foil were prepared successfully. Comparing with those without TiO₂coating, the content of Ti on the surface of anodized aluminum foil prepared by surface self-assembly method increased by 30 times while the specific capacitance of anodized aluminum foil was enhanced by 44.26% at the withstanding voltage of 400 V. Therefore, anodized aluminum foil with a high specific capacitance prepared by above method exhibits great potential in commercial application of aluminum electrolytic capacitor in the future.

Key words: surface self-assembly method, surface charge, Al₂O₃/TiO₂ composite film, aluminum electrolytic capacitor

中图分类号:

TQ174

王景平, 成方媛, 杜显锋, 徐友龙. 表面自组装法制备高比容Al₂O₃/TiO₂复合膜[J]. 无机材料学报, 2018, 33(6): 617-622.

WANG Jing-Ping, CHENG Fang-Yuan, DU Xian-Feng, XU You-Long. Preparation of Al₂O₃/TiO₂ Composite film with High Specific Capacitance by Surface Self-assembly Method[J]. Journal of Inorganic Materials, 2018, 33(6): 617-622.

图/表 7

图1 样品的制备过程示意图

Fig. 1 Schematic diagram of preparation process of samples

图2 不同处理阶段的铝箔表面和断面SEM照片

Fig. 2 Surface and cross section SEM images of aluminum foil in different processing stages

表1 不同处理阶段的铝箔接触角照片

Table 1 Contact angle photos of different processing stages of aluminum foil

Specimen	S1	S2	S3	S4	S5
Contact angle	9.33°	125.53°	5.65°	42.92°	21.92°

表2 不同处理阶段铝箔表面Zeta电位

Table 2 Zeta potentials of aluminum foil surfaces on different processing stages

Specimen	S1	S2	S3	S4	S5
Zeta potential/mV	+75.25	+97.97	-55.91	+37.24	+2.68

图3 不同处理条件下的铝箔EDAX图谱

Fig. 3 EDAX patterns of different processing stages of aluminum foilS1, S2, S3, S4, S5, and S5-a are the surface EDAX results while S5-b is S5 cross section results

图4 样品S0和S5的XRD图谱

Fig. 4 XRD patterns of sample S0 and S5

表3 铝箔的电容器特征参数

Table 3 Capacitor characteristic parameters of anodic aluminum foils coated with or without TiO2

Specimens	C/ (nF•cm^-2)	V/V	CV/ (nF•V•cm^-2)	ΔC/%	ΔCV/%
S0	29.46	408	12019.68	-	-
S6	32.85	402	13205.70	11.51	9.87
S5	42.50	405	17212.50	44.26	43.20

参考文献 15

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表面自组装法制备高比容Al₂O₃/TiO₂复合膜

Preparation of Al₂O₃/TiO₂ Composite film with High Specific Capacitance by Surface Self-assembly Method

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