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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Preparation of nanoporous carbon particles and their cryogenic hydrogen storage capacities
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Preparation of nanoporous carbon particles and their cryogenic hydrogen storage capacities

机译：纳米多孔碳颗粒的制备及其低温储氢能力

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Spherical nanoporous carbon particles were synthesized from carbon precursor solutions of sucrose with either silica sols or colloidal silica particles, or both, in a direct one-step aerosol-assisted process followed by carbonization and then removal of the silica template. The resulting carbon particles show very high porosity with narrow pore size distributions, surface areas up to 2000 m(2)/g, and pore volumes up to 4.0 cm(3)/g. Three different kinds of spherical nanoporous carbon particles were prepared: (1) unimodal nanoporous particles using tetraethyl orthosilicate (TEOS) as the only silica source for the template, (2) bimodal nanoporous particles using both TEOS and colloidal silica nanoparticles as a composite template, and (3) foamlike highly porous particles using only colloidal silica for the template. The porosity and pore sizes for these carbon particles depend on the type and amount of silica template precursor added to the sucrose precursor solutions. These carbon particles were characterized by transmission electron microscopy, field emission scanning electron microscopy, and nitrogen sorption surface area measurements, and we measured hydrogen adsorption at various temperatures and pressures. Hydrogen sorption of > 4.0 wt % at 77 K and > 20 bar was found for the unimodal nanoporous carbon particles.
机译：球形纳米多孔碳颗粒是由蔗糖的碳前驱体溶液，硅溶胶或胶态二氧化硅颗粒或两者兼而有之，以直接的一步式气溶胶辅助工艺合成的，随后进行碳化，然后去除二氧化硅模板。所得的碳颗粒显示出非常高的孔隙度，具有狭窄的孔径分布，高达2000 m（2）/ g的表面积和高达4.0 cm（3）/ g的孔体积。制备了三种不同类型的球形纳米多孔碳颗粒：（1）使用正硅酸四乙酯（TEOS）作为模板的唯一二氧化硅来源的单峰纳米多孔颗粒;（2）使用TEOS和胶态二氧化硅纳米颗粒作为复合模板的双峰纳米多孔颗粒， （3）仅使用胶体二氧化硅作为模板的泡沫状高度多孔颗粒。这些碳颗粒的孔隙率和孔径取决于添加到蔗糖前体溶液中的二氧化硅模板前体的类型和数量。这些碳颗粒通过透射电子显微镜，场发射扫描电子显微镜和氮吸附表面积测量进行了表征，并且我们在各种温度和压力下测量了氢吸附。对于单峰纳米多孔碳颗粒，发现在77 K和> 20 bar下的氢吸附> 4.0 wt％。

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