نتایج جستجو برای: hydrogen desorption
تعداد نتایج: 165961 فیلتر نتایج به سال:
In this paper, we investigate the sliding friction and wear behavior of a hydrogenated diamond-like carbon (DLC) film in ultrahigh vacuum (UHV) and under partial pressures of water vapor, oxygen, nitrogen and hydrogen. The initial friction coefficient of the film in UHV was 0.15, but decreased steadily to values as low as 0.03 after about 30 sliding passes. During longer duration tests, the fri...
Designing safe, compact and high capacity hydrogen storage systems is the key step towards introducing a pollutant free hydrogen technology into a broad field of applications. Due to the chemical bonds of hydrogen-metal atoms, metal hydrides provide high energy density in safe hydrogen storage media. Reactive hydride composites (RHCs) are a promising class of high capacity solid state hydrogen ...
The kinetics of hydrogen absorption/desorption can be improved by decreasing particle size down to a few nanometres. However, the associated evolution of activation energy remains unclear. In an attempt to clarify such an evolution with respect to particle size, we electrochemically deposited Mg nanoparticles on a catalytic nickel and noncatalytic titanium substrate. At a short deposition time ...
Laser desorption/ionization from a single-crystal silicon surface was performed using a laser operating in the 3-microm region of the mid-infrared. Analyte molecules up to 6 kDa were ionized with no added matrix. As with ultraviolet desorption/ionization from porous silicon (DIOS), IR laser desorption from silicon does not produce matrix ions that can interfere with analysis of low-mass analyte...
The kinetics and thermodynamics for the reversible hydrogen desorption from NaH (and NaH derived from NaAlH4) are greatly improved by nanosizing and providing close contact to a porous carbon matrix.
7 ABSTRACT: NaBH4 has long been identified as a viable hydrogen-storage 8 material due to a theoretical gravimetric H2 capacity of 10.6 wt %. Because of 9 the high enthalpy of decomposition of 108 ± 3 kJ mol−1, thermal 10 decomposition of the pristine material does not occur until at least 500 °C, 11 and thus NaBH4 has yet to be utilized in hydrogen-storage processes. In this 12 study, NaBH4 ha...
Hydrogen is efficiently released during water dissociation on zirconium (Zr), while even very rapid temperature programmed heating of a hydrogen covered Zr surface predominantly leads to dissolution (approximately 99% dissolution). To help resolve these apparently contradictory observations, we have studied the dynamics of water (D2O) dissociation on a crystalline Zr surface by probing the rota...
The fundamental connection between electron stimulated desorption ~ESD! of hydrogen ~H!/ deuterium ~D! at silicon surfaces in ultrahigh vacuum and hot-carrier-stimulated desorption of H/D at the oxide/silicon interfaces in complementary metal–oxide–semiconductor ~CMOS! devices is presented. The dependences of device degradation on carrier energy and current density were studied on two generatio...
Hydrogen storage systems based on the combination reactor concept are promising for application of future complex hydride materials with high storage capacities and low reaction kinetics at moderate operating temperatures. In such a reactor, a fast reacting metal hydride is added to a complex hydride material in a separate compartment of the tank combining the advantages of the high storage cap...
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