Synthesis of Amorphous Hydrous Ruthenium Dioxide for Electrochemical Capacitors

摘要:

采用改性的中和反应及热处理工艺合成了电化学电容器用无定形水合二氧化钌材料（RuO2·xH2O），并以高导电性石墨板作集流体，研究了合成材料的电化学性能。实验中，以自制的喷雾装置和十二烷基磺酸钠（SDS）分别作为反应辅助分散技术和表面分散剂。结果表明，合成材料的前驱体经175 ℃处理后，可获得大比表面积（218 m2/g）、蓬松状、深黑色无定形的高性能电极材料。循环伏安实验（CV）结果表明，该合成材料具有较好的比电容（995 F/g at 1mV/s）和倍率特性；电化学交流阻抗（EIS）实验进一步证明了该材料具有较低的等效串联内阻（～25 mΩ），同时验证了材料的倍率特性良好。合成材料有望在国防及民用领域电化学电容器中得到潜在应用

Abstract:

Amorphous hydrous ruthenium dioxide RuO2·xH2O was synthesized by a modified neutralization reaction and heat treatment process, and electrochemical performances of the synthesized product were investigated using the graphite plate with high conductivity as current collector. In the experiment a home-made sprayer and sodium dodecyle sulfate (SDS) were used as an assistant technique and dispersive agent, respectively. Results indicate that amorphous and high performance electrode materials with great specific area of 218 m2/g and fluffy and heavy black color morphology can be obtained after the precursor of the synthesized product is annealed at 175 oC. Cyclic voltammetry (CV) results show the prepared product is featured with good average specific capacitance (995 F/g at 1 mV/s) and excellent electrochemical rate. It is further proved by electrochemical impedance spectra (EIS) test that the prepared product has lower equivalent serial resistance of ~25 mΩ and good electrochemical rate performance