Feaver Aaron, Sepehri Saghar, Shamberger Patrick, Stowe Ashley, Autrey Tom, Cao Guozhong
Materials Science & Engineering, University of Washington, Seattle, WA 98195, USA.
J Phys Chem B. 2007 Jul 5;111(26):7469-72. doi: 10.1021/jp072448t. Epub 2007 Jun 14.
Coherent carbon cryogel-ammonia borane (C-AB) nanocomposites were synthesized, and improved H2 storage properties are reported. Porous carbon cryogels were impregnated with AB in tetrahydrofuran solution at 25 degrees C under argon; 30% of the carbon cryogel pore volume was filled to produce a 24 wt % C-AB nanocomposite. Nitrogen sorption isotherms, X-ray diffraction, differential scanning calorimetry, differential thermal/thermal gravimetric analyses, mass spectrometry, and 11B NMR were used to characterize the coherent C-AB nanocomposites. Findings include a merged two-step hydrogen release reaction with an appreciable reduction in the dehydrogenation temperature to <90 degrees C as well as the suppression of borazine release. The possible nanosize effects on the H2 storage properties are discussed.
合成了相干碳气凝胶-氨硼烷（C-AB）纳米复合材料，并报道了其改善的储氢性能。在氩气气氛下，于25℃将多孔碳气凝胶在四氢呋喃溶液中用氨硼烷浸渍；填充30%的碳气凝胶孔体积以制备24 wt%的C-AB纳米复合材料。使用氮气吸附等温线、X射线衍射、差示扫描量热法、差热/热重分析、质谱和11B核磁共振对相干C-AB纳米复合材料进行表征。研究结果包括合并的两步氢释放反应，脱氢温度显著降低至<90℃，以及硼嗪释放受到抑制。讨论了纳米尺寸效应可能对储氢性能产生的影响。
