کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1284858 973099 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of hydroxide and carbonate alkaline media on anion exchange membranes
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Effect of hydroxide and carbonate alkaline media on anion exchange membranes
چکیده انگلیسی

The effect of hydroxide and carbonate alkaline environments on the chemical stability and ionic conductivity of five commercially available anion exchange membranes was investigated. Exposure of the membranes to concentrated hydroxide environments (1 M) had a detrimental effect on ionic conductivity with time. Over a 30-day period, decreases in conductivity ranged from 27% to 6%, depending on the membrane. The decrease in ionic conductivity is attributed to the loss of stationary cationic sites due to the Hofmann elimination and nucleophilic displacement mechanisms. Exposure of the membranes to low concentration hydroxide (10−4 M) or carbonate/bicarbonate (0.5 M Na2CO3/0.5 M NaHCO3) environments had no measurable effect on the ionic conductivity over a 30-day period. ATR-FTIR spectroscopy confirmed degradation of membranes soaked in 1 M KOH. Apparition of a doublet peak in the region between 1600 cm−1 and 1675 cm−1 confirms formation of carbon–carbon double bonds due to Hofmann elimination. Membranes soaked in mild alkaline environments did not show formation of carbon–carbon double bonds.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 195, Issue 21, 1 November 2010, Pages 7176–7180
نویسندگان
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