کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7732167 1497946 2015 31 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Proton conducting sulfonated poly (imide-benzimidazole) with tunable density of covalent/ionic cross-linking for fuel cell membranes
ترجمه فارسی عنوان
پروتئون پلی اتیلن بنزیمیدازول سولفونیک با تراکم اتصال متقابل کووالان / یونی برای غشاء سلول سوختی
کلمات کلیدی
پلی اورتان سولفون شده (امید بنزیمیدازول)، متقابل غشای تبادل پروتون،
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی
Ionic cross-linked sulfonated polyimides containing bis-benzimidazole rings have been prepared from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA), 6,6′-bis[2-(4-aminophenyl)benzimidazole] (BAPBI) and 3,3′-bis(4-sulfophenoxy)- benzidine (BSPOB). A new cross-linker, 4,4′-bibromomethenyl diphenyl ether, is used to induce covalent cross-linking between halogen and imidazole groups in SPIBI chains via a facile thermally activated reaction. The resulted covalent and ionic cross-linked membranes show an improved resistance to hydrolytic attack in deionized water at 80 °C (more than two months) and free radical attack in Fenton's solution (more than 690 min) as compared to non-cross-linked SPIBIs (less than two days and 270 min, respectively). Cross-linking also results in a reduction in proton conductivity due to the blockage of a hydrophilic channel. However, all the prepared CBr-ySPIBI-x membranes show a proton conductivity higher than 10−2 S cm−1 under hydrous condition. This could be attributed to the fact that more cross-linking sites are contained in each repeating unit, which ensures enough cross-linking degree at high sulfonation level. All these results suggest that CBr-ySPIBI-x membranes have a great potential for applications in the proton exchange membrane fuel cells.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 286, 15 July 2015, Pages 571-579
نویسندگان
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