Lysenko Vladimir, Bidault Fabrice, Alekseev Sergei, Zaitsev Vladimir, Barbier Daniel, Turpin Christophe, Geobaldo Francesco, Rivolo Paola, Garrone Edoardo
Materials Physics Laboratory, LPM, CNRS UMR-5511, INSA de Lyon, 7 avenue Jean Capelle, Bat. Blaise Pascal, 69621 Villeurbanne Cedex, France.
J Phys Chem B. 2005 Oct 27;109(42):19711-8. doi: 10.1021/jp053007h.
The amount of hydrogen present in porous silicon (PS) nanostructures is analyzed in detail. Concentration of atomic hydrogen chemically bound to the specific surface of PS is quantitatively evaluated by means of attenuated total reflection infrared (ATR-IR) spectroscopy and temperature-programmed desorption (TPD) spectroscopy. The concentration values are correlated to the PS nanoscale morphology. In particular, the influence of porosity, silicon nanocrystallite dimension, and shape on hydrogen concentration values is described. Hydrogen concentrations in fresh, aged, as well as in chemically and thermally treated PS layers are measured. Maximal hydrogen concentration of 66 mmol/g is detected in nanoporous layers with high (>95%) porosity consisting of nanocrystallites with dimensions of about 2 nm. Mass energy density that can be potentially obtained from this amount of hydrogen through a low-temperature fuel cell is estimated to be about 2176 W-h/kg and is found to be comparable with other substances containing hydrogen, such as hydride materials and methanol, which are usually used as hydrogen reservoirs.
详细分析了多孔硅（PS）纳米结构中氢的含量。通过衰减全反射红外（ATR-IR）光谱和程序升温脱附（TPD）光谱定量评估化学结合在PS特定表面的原子氢浓度。浓度值与PS纳米级形态相关。特别描述了孔隙率、硅纳米微晶尺寸和形状对氢浓度值的影响。测量了新鲜、老化以及经过化学和热处理的PS层中的氢浓度。在由尺寸约为2 nm的纳米微晶组成的高孔隙率（>95%）的纳米多孔层中检测到最大氢浓度为66 mmol/g。通过低温燃料电池从该量的氢中潜在获得的质量能量密度估计约为2176 W-h/kg，并且发现与其他含氢物质相当，例如通常用作储氢材料的氢化物材料和甲醇。
