A support wafer made of silicon wafer comprising, on a first surface a porous silicon layer having protrusions, porous silicon pillars extending from the porous silicon layer to the second surface of the wafer, in front of each protrusion. Layers constituting a fuel cell can be formed on the support wafer.

 
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< Catalysts, activating agents, support media, and related methodologies useful for making catalyst systems especially when the catalyst is deposited onto the support media using physical vapor deposition

< Control device of vehicle

> Fuel cell

> Process for treating a sulfur-containing spent caustic refinery stream using a membrane electrolyzer powered by a fuel cell

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