For what seems like forever, hydrogen fuel-cell technology has been a shimmering mirage dancing on the distant horizon of the auto-tech desert. No matter how long we keep trudging, how many reams of press-releases we wade through, nothing definite ever seems to happen to bring it any closer. Until now?
Honda Motor Co. has announced the development of it’s latest (fourth generation), compact, solar-powered, home refueling station for the hydrogen fuel FCX Clarity (200 of which are being leased in a California pilot project). With a compact 6-kilowatt solar panel array for power, the station contains a revolutionary high-pressure electrolyzer that can deliver 0.5 KG of extremely pure, pressurized hydrogen gas to the car for every 8 hours of sunlight. Why is this significant?
Although every major automaker has a fuel-cell research program, with GM in particular proclaiming that hydrogen (rather than advances in batteries) is the basis of it’s long term energy strategy, there are several obvious barriers to the success of the technology:
* Hydrogen is actually an energy storage medium rather than a fuel in the petroleum sense (i.e. all usable hydrogen fuel must be produced by electrolysis or reformation, which consume electricity).
* an entire hydrogen refueling infrastructure would need to be built, across the U.S. and around the world.
* vehicle fuel cells remain incredibly expensive to produce.
Since before 2000, billions of dollars have been pouring into vehicle fuel-cell research, but if any practical developments in these three areas have occurred they’ve been kept remarkably quiet. Critics like Doug Korthoff of LiveOilFree accuse automakers (and oil companies) of having used fuel-cell technology as a red-herring to distract lawmakers from requiring battery electric vehicles. Even among those critics who don’t suspect bad faith, many point out that the first barrier is not so much a challenge we can hope to overcome as it is inescapable physics. In other words, the whole proposition may simply not make much sense, particularly if we see competing improvements in battery technology.
But here is where the potential significance of the home refueling station becomes apparent. With one relatively small solar panel and some plumbing that could easily fit on a garage wall, the Honda home station provides enough purified, high-pressure hydrogen from a single day’s sunlight (0.5 KG) to power the car for one standard commute for most drivers.
Voila! Both the first and second obstacles appear to have been dealt a serious blow! It would seem that with this equipment, both the “problem” of where to get the energy to create hydrogen, and the crushing economics of building all the refueling infrastructure necessary to get the system on the road, have been significantly reduced. Of course hydrogen filling stations would still be required, but early-adopters should be a lot more willing to buy a vehicle without waiting for a filling-station network that blankets the earth, if they know that at least they can fill their cars at home. And conceptually, this system works even better if it’s paired with a EREV such as the GM-Volt, with the fuel-cell taking the place of the existing range extender. Days might pass before the vehicle actually consumes any hydrogen, days in which the home system is gradually topping off the tank. Filling station construction could, initially at least, be concentrated on the highways.
Of course, all this may not be quite as wonderful as it sounds (what ever is?). Omitted in the Honda press release and in many of the press accounts is the fact that the electrolyzer requires natural gas as a raw material to generate hydrogen. So the solar panels are not simply providing 30 miles/day of travel directly from the sun, they are in effect converting one fuel to another, albeit a tremendously abundant, environmentally friendly fuel. How much energy is coming from each source, and at what efficiency is of course proprietary information that is not available. We can hope that the technology will ultimately be adapted to water electrolysis, but who knows? And none of this speaks to the third barrier, the current exorbitantly high cost of vehicle fuel cells.
Nevertheless, those of us who until now have been skeptical of the coming “hydrogen economy” can look at this development and say that if it’s not exactly the light at the end of the tunnel, at least it’s starting to look like there really is a tunnel, and not just a black arch painted on the side of a mountain by a lunatic coyote.
Sources: (Cartech, New York Times, HondaNews)






