应用于氧化还原电池正极的Fe^(2+)/Fe^(3+)胶体电解质研究

Study of Fe^(2+)/Fe^(3+) gelled-electrolyte for redox battery application

设计了一种新的Zn-Fe氧化还原胶体电池。研究了胶凝剂气相SiO2含量对胶体电解质特性的影响。SiO2含量愈高,电解质愈粘稠,电导率愈低。采用循环伏安法研究了Fe3+/Fe2+电对在胶体电解质中的电化学行为。结果表明,该体系中Fe3+/Fe2+在Pt电极上的电极反应属于准可逆过程。计算得到Fe3+的扩散系数为2.29×10-6 cm2/s。组装的Zn/Fe胶体电池具有较好的循环性能,其平均库仑效率达94.83%,平均能量效率为44.61%。

A novel Zn-Fe gel battery was reported. The effects of SiO2 concentration to the characteristics of the gelled-electrolyte were revealed. The viscosity of the electrolyte increases and the conductivity de- creases with an increase in SiO2 concentration. The electrochemical behavior of Fe3＋/Fe2＋ couple in col- loidal electrolyte was investigated using cyclic voltammetry. The results showed that Fe3＋/Fe2＋ redox re- action in this system on Pt electrode is quasi-reversible. The diffusion coefficient for Fez＋ was calculated as 2.29 × 10-6 cm2/s. The constructed Zn/Fe cell has impressive cycle performance and its coulombie and energy efficiencies were determined to be 94.83% and 44.61%.