This achievement was one of the key milestones in Proton's contract administered by the Naval Research Laboratory and funded by the Defense Advanced Research Projects Agency, or DARPA.

The HIPRESS cell stacks passed the 1,000-hour mark of system operation at 2,000 pounds per square inch, or psi. The success of these tests is an important indication of the durability of the technology, which has the potential to be a critical component to a number of aerospace platforms being developed for military and homeland security purposes. Proton also demonstrated this same design at 3,000 psi over shorter time periods.

The HIPRESS electrolysis cell stacks were tested in both the HOGEN 40 hydrogen generators and UNIGEN regenerative fuel cell units. During these tests, the HOGEN 40 hydrogen generators efficiently produced high-pressure gaseous hydrogen and oxygen from water without the use of mechanical compression.

Proton's UNIGEN regenerative fuel cell efficiently produced hydrogen gas and oxygen and stored the gases until needed. The two gases then were reacted in the fuel cell to generate electrical power with the only emission being water.

Storing hydrogen efficiently at high pressures is a key feature in space- limited applications requiring higher energy densities such as automotive fuel cells, telecom backup power and aerospace applications. For some defense applications, the hydrogen and oxygen gases may be burned for high thrust propulsion or ionized for very high specific impulse electric propulsion.

Proton's team on this contract includes Aerojet (formerly General Dynamics) and ATK Thiokol Propulsion, who provide expertise on space and satellite technology implementation. The team also includes Schafer Corporation, KB Sciences Inc., Kare Technical Consulting and Myers Manufacturing Company, who provide additional aerospace expertise.

Proton's Chief Operating Officer, Dr. Larry Sweet commented, "We are pleased to be working with our partners, DARPA and the Naval Research Laboratory on this important technology. We believe our high-pressure technology will allow our customers to compress hydrogen more efficiently than traditional mechanical compression under certain conditions.

"This solid state advancement also offers cost reduction potential and system simplification that can be applied to our current commercial industrial gas equipment as well as future automotive and backup power products."

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