It's pretty expensive, but it claims 1000 times the surface area of equally sized plates, and 7 times the gas output.
http://www.greencarcongress.com/2007/03 ... ere_t.html
[quote]
Nano NiFe Cathode Electrodes for Water Electrolysis QSI-Nano® NiFe alkaline water electrolysis electrodes are
manufactured using a process in which a blend of highly catalytic QSI-Nano® nickel and iron particles are functionalized
by dispersing into a proprietary formulation, spray coated, and sintered onto a stainless steel (SS) substrate. The resulting
electrodes have an increased surface area of approximately 1000 times vs. standard SS metal plates and may be used as a
drop-in solution for existing alkaline electrolyzers to achieve the following results:
• Increased Gas Output
• Decreased Energy Consumption
• Decreased Size While Maintaining Efficiency
Prices (Includes Two 16 Gauge 316 SS Electrodes, Nano
NiFe Coating on One Side Only)*
2â€