This is an interesting artcile....perhaps some of the breakthorugh may relates to the electrolyzers / electorolysis process referenced below....or perhaps nano silicon from Hpq is being used or some combination of the same....

https://phys.org/news/2019-09-electrolysis-breakthrough-hydrogen-conundrum.html

The first water electrolyzers used alkaline water, and this remains the traditional approach, Dr. Simonov says. But more advanced and efficient technology uses an acidic environment, using solid-state electrolytes—unfortunately, the catalysts can't withstand this environment for long.

Dr. Simonov and members of his research team, including Dr. Manjunath Chatti and James Gardiner, have made a discovery with enormous potential to solve the instability problem, making hydrogen generation by water electrolysis more economically viable.

"We're replacing iridium with elements that are abundant, cheap, and operate in a more stable manner," Dr. Simonov says. "We've demonstrated their stability in very strongly acidic conditions and up to 80°C, which is an industrially relevant temperature. We achieved absolutely no degradation."

Dr. Simonov describes the system he's developing with his team as "self-healing." Because all metals—even iridium—dissolve during electrolysis, the researchers wondered if the dissolved material could be redeposited on the electrode during operation.

"It turned out that it can," he says. "We've produced a highly active electrode surface based on abundant metals that is sustaining industrially relevant rates of water splitting." The high temperature and the strongly acidic environment "makes our most recent work different from pretty much everyone in the scientific world, and brings us closer to industry application," he says.

The Australian Renewable Energy Agency (ARENA) is funding further research, with the goal of producing greater efficiencies and developing a scalable electrode fabrication process, suitable for industry. Dr. Simonov and his team are working to achieve this goal with Monash chemistry Professor Douglas MacFarlane and collaborators from Australian National University, Professor Antonio Tricoli and Professor Yun Liu.