Behaviors of Si, B, Al, and Na during Electrochemical Reduction of Borosilicate Glass in Molten CaCl2
Behaviors of Si, B, Al, and Na during Electrochemical Reduction of Borosilicate Glass in Molten CaCl2
复制标题
硼硅酸盐玻璃在熔融 CaCl2 中电化学还原过程中 Si、B、Al 和 Na 的行为
DOI：
10.1149/2.1201707jes
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发表时间：
2017
影响因子：
3.9
通讯作者：
Nohira Toshiyuki
中科院分区：
文献类型：
--
作者：
Katasho Yumi;Yasuda Kouji;Nohira Toshiyuki
研究了硼硅酸盐玻璃在1123 K 熔融CaCl 2 中的电化学还原。使用根据该物质的热力学数据构建的势-pO 2− 图来估计组成元素（即Si、B、Al、Na 和K）的行为。该图表明循环伏安图中的第一个阴极波是由B 2 O 3 组分的还原产生的。从图中预测的Na 2 O和K 2 O组分的溶解通过在浸入熔融CaCl 2 而不电解的情况下对硼硅酸盐玻璃板进行能量色散X射线分析来证实。相对于 Ca 2+/Ca 在 0.9 V 还原的硼硅酸盐玻璃的扫描电子显微镜/波长色散 X 射线图和拉曼光谱表明 SiO 2 和 B 2 O 3 被还原为 Si 和 B-Si 化合物。表明由于 O 2− 离子的增加而形成 Ca-Al-O 化合物。 0.9 V 电解期间的 pO 2− 范围为 2.95–3.46。
The electrochemical reduction of borosilicate glass in molten CaCl 2 at 1123 K was investigated. The behaviors of the constituent elements, ie, Si, B, Al, Na, and K, were estimated using potential–pO 2− diagrams constructed from the thermodynamic data for the species. The diagrams suggested that the first cathodic wave in the cyclic voltammogram results from the reduction of the B 2 O 3 component. The dissolution of the Na 2 O and K 2 O components, which was predicted from the diagrams, was confirmed by energy dispersive X-ray analysis of a borosilicate glass plate after immersion into molten CaCl 2 without electrolysis. The scanning electron microscopy/wavelength dispersive X-ray mappings and Raman spectrum for borosilicate glass reduced at 0.9 V vs. Ca 2+/Ca indicated that SiO 2 and B 2 O 3 are reduced to Si and B–Si compound. The formation of Ca–Al–O compounds owing to the increase of O 2− ions is suggested. The pO 2− range during electrolysis at 0.9 V was indicated to be 2.95–3.46.