Abstract
A methodology for quantitative chemical analysis of the complex “borohydride-borate-hydroxide-carbonate-water” mixtures used as fuel in the borohydride fuel cell was developed and optimized. The methodology includes the combined usage of the acid-base and iodometric titration methods. The acid-base titration method, which simultaneously uses the technique of differentiation and computer simulation of titration curves, allows one to determine the contents of hydroxide (alkali), carbonate, and total “borate + borohydride” content. The iodometric titration method allows one to selectively determine borohydride, so the content of each of OH-, BH4-, BO2-, and CO32- anions in the fuel becomes estimated. The average determination error depends on the number and ratio of compounds in a mixture. Specific details of the analysis of various fuel mixtures are discussed.
Highlights
The intense progress of electric vehicles, portable electronics, mobile communication tools, and other systems, which require independent power supply, stimulates the design of new chemical power sources [1, 2]
Direct borohydride fuel cells (DBFCs) are intensively evolved in which alkaline aqueous solutions of such salts as LiBH4, NaBH4, and KBH4 are used as fuel [3,4,5,6,7,8,9]
We have developed a methodology for quantitative analysis of complex “borohydride-borate-alkali-carbonate-water” mixtures based on the methods of acid-base and iodometric titration
Summary
The intense progress of electric vehicles, portable electronics, mobile communication tools, and other systems, which require independent power supply, stimulates the design of new chemical power sources [1, 2] These sources have to possess high-energy specific characteristics and they must be safe and comfortable in use. Direct borohydride fuel cells (DBFCs) are intensively evolved in which alkaline aqueous solutions of such salts as LiBH4, NaBH4, and KBH4 are used as fuel [3,4,5,6,7,8,9] In these systems, electrical energy is generated by means of hydrolysis and electrochemical oxidation of borohydrides into borates. The difficulty of the design of effective and sustainable anode electrocatalysts for the anodic oxidation of borohydride limits the efficiency and power density attainable in these devices [16,17,18]
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