Nanoconfinement of NaAlH₄ inside a nanoporous carbon material and its effect on the reversible hydrogen storage has been studied. NaAlH₄ has been deposited into/onto a highly microporous carbon material by solution impregnation method. The structure of the deposited NaAlH₄ and H₂ release from NaAlH₄ after deposition and after 10 dehydrogenation/hydrogenation cycles has been investigated. Materials with smaller NaAlH₄ particles and a higher ratio of amorphous NaAlH₄ phase start releasing hydrogen at ambient temperatures (>23 °C). Hydrogen release takes place from nanostructured NaAlH₄ with a more even rate over a larger temperature interval. During repetitive cycling, the crystalline NaAlH₄ had been converted into amorphous nanoconfined phase or irreversibly decomposed into bulk phases, crystalline Al and Na₃AlH₆, which have been detected by X-ray diffraction method. Hydrogen release from nanoconfined amorphous NaAlH₄ started already at ambient temperatures. Improved reversibility of H₂ storage has been demonstrated. The data for nanoconfined material has been compared to bulk NaAlH₄.

研究了NaAlH ₄在纳米多孔碳材料中的纳米约束及其对可逆储氢的影响。NaAlH ₄已通过溶液浸渍法沉积到高微孔碳材料中/上。已经研究了在沉积之后以及10个脱氢/氢化循环之后从NaAlH ₄释放的沉积NaAlH ₄和H ₂的结构。具有较小NaAlH ₄颗粒和较高比例的无定形NaAlH ₄相的材料在环境温度（> 23°C）下开始释放氢。氢从纳米结构的NaAlH ₄释放在较大的温度间隔内具有更均匀的速率。在重复循环过程中，结晶NaAlH ₄已转化为非晶纳米限制相或不可逆地分解为本体相，结晶Al和Na ₃ AlH ₆已通过X射线衍射法检测到。纳米约束非晶态NaAlH _4的氢释放已经在环境温度下开始。已经证明了H ₂储存的改善的可逆性。纳米受限材料的数据已与大量NaAlH ₄进行了比较。