Hydrogen generation from hydrides in millimeter scale reactors for micro proton exchange membrane fuel cell applications

Integrated micro-power source based on a micro-silicon fuel cell and a micro electromechanical system hydrogen generator

“…Both the micro-silicon fuel cell and the MEMS hydrogen generator are fabricated from silicon wafers using standard MEMS fabrication processes, which enable the miniaturization of the micro-system down to a sub-millimeter power source. In this work, calcium hydride (CaH 2 ) is used as the fuel due to its high energy density, fast and complete reaction, and low volume expansion [34]. CaH 2 is not typically used for large scale mobile hydrogen generators due to its higher weight per hydrogen stored, but for the device described here, small volumes are more important than low weight.…”

Liquid‐Phase Chemical Hydrogen Storage: Catalytic Hydrogen Generation under Ambient Conditions

“…[42] It was reported that the hydrolysis reaction of LiBH 4 barely produced more than 50 % of the theoretical yield because the products and the unreacted LiBH 4 formed a solid mass that clogged the reaction vessel, thus limiting the full utilization of this hydride. [43] Based on investigations to date, hydrogen generation from the hydrolysis of NaBH 4 at room temperature appears an excellent candidate for portable application. The first apparatus for the supply of hydrogen by experimental bench tests on the basis of sodium borohydride has been reported.…”

Hydrogen generation from LiBH 4 solution catalyzed by multiwalled carbon nanotubes supported Co–B nanocatalysts for a portable micro proton exchange membrane fuel cell application

“…And the maximum hydrogen yield was only 50.0 wt%. Zhu et al [8] also found the similar results and they believed the insufficiency was attributed to LiBH 4 and its products forming a single solid and impermeable mass clogged the reaction vessel, thus limiting the full utilization of LiBH 4 . In addition, their results revealed that LiBH 4 hydrolysis could release 30.0% of stoichiometric amount of hydrogen within 3 h (corresponding to 6.8 mL min À1 g À1 ) at slow water injection rate of 10 mL h À1 .…”