Stabilization of Iron(VI) Ferrate Cathode Materials Using Nanoporous Silica Coatings
Stabilization of Iron(VI) Ferrate Cathode Materials Using Nanoporous Silica Coatings
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DOI：
10.1149/1.2191359
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发表时间：
2006-06
影响因子：
3.9
通讯作者：
Kenneth A. Walz;J. Szczech;Amy N. Suyama;Wendy E. Suyama;Lucas C. Stoiber;W. Zeltner;M. E. Armacanqui;M. Anderson
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文献类型：
--
作者：
Kenneth A. Walz;J. Szczech;Amy N. Suyama;Wendy E. Suyama;Lucas C. Stoiber;W. Zeltner;M. E. Armacanqui;M. Anderson
含有Fe（VI）的高铁酸盐近年来作为阴极材料受到关注，这是由于它们在还原为Fe（III）时理论上能够接受三个电子。不幸的是，高铁酸盐也有些不稳定，特别是当在高温下或在碱性电解质存在下储存时。在本文中，我们文件的稳定性，固体钡和钾的铁酸盐在各种环境条件下，并报告使用SiO2薄膜涂层，以稳定阴极组成的固体钡高铁酸盐。使用溶胶-凝胶技术从胶体二氧化硅悬浮液沉积纳米多孔涂层。涂层的高铁酸盐的增强的稳定性证明，其放电性能的特点是相对于未涂覆的材料。所采用的涂层技术可以适用于其他纳米颗粒金属氧化物化学，从而提出了一种可能的方法来修改高铁酸盐，并可能克服其稳定性的限制。
Ferrate salts containing Fe(VI) have received attention as cathode materials in recent years due to their theoretical ability to accept three electrons while being reduced to Fe(III). Unfortunately, ferrate salts are also somewhat unstable, particularly when stored at elevated temperatures or in the presence of an alkaline electrolyte. In this paper, we document the stability of solid barium and potassium ferrate salts under various environmental conditions and report on the use of SiO 2 thin-film coatings to stabilize cathodes composed of solid barium ferrate. The nanoporous coatings are deposited from colloidal silica suspensions using sol-gel techniques. The enhanced stability of coated ferrates is demonstrated, and their discharge performance is characterized relative to uncoated materials. The coating technique employed may be applicable to other nanoparticulate metal oxide chemistries, thus presenting a possible method to modify ferrates and perhaps overcome their stability limitations.