کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7707292 1497315 2018 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dual-tuning the thermodynamics and kinetics: Magnesium-naphthalocyanine nanocomposite for low temperature hydrogen cycling
ترجمه فارسی عنوان
ترمودینامیک و سینتیک دوتایی: نانوکامپوزیت منیزیم - نفتالایکانیین برای دوچرخه سواری با دمای پایین کم
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی
2,11,20,29-Tetra-tert-butyl-2,3-naphthalocyanine (TTBNc) was used as an alternative host to support magnesium (Mg) nanoparticles. After deposition and decomposition of dibutylmagnesium on TTBNc, Mg nanoparticles of around 4 nm supported on TTBNc were observed by TEM. These TTBNc stabilized Mg nanoparticles were found to absorb hydrogen at 100 °C and release hydrogen from 75 °C. The Mg-TTBNc material showed good hydrogen cycling properties and structural stability. Kinetic measurements showed fast hydrogen absorption within 2 min at 150 °C. The hydrogen desorption kinetics were slower at the same temperature but faster at 250 °C with 80% of the hydrogen desorbed within 1 h. Enthalpy and entropy for hydrogen uptake and release in Mg-TTBNc determined from PCT measurements were found to be of 52.7 ± 4.9 kJ mol−1 H2 and 107.8 ± 9.4 J K−1 mol−1 H2, respectively. These values are much lower than those of bulk Mg.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 43, Issue 10, 8 March 2018, Pages 5089-5097
نویسندگان
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