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Hydrogen vehicles aren't too eco-friendly in terms of carbon emissions, according to an in-depth new study.  (Source: Web Wombat)
Study indicates plug-ins feature a lower emissions life than gas vehicles, but hydrogen vehicles feature greater emissions

The hydrogen vehicle movement appears stalled.  The push to use the diatomic gas as auto fuel never exactly made it off the ground due to a lack of infrastructure -- production, distribution, and storage facilities.  However, for a time automakers like Toyota and Honda were pushing ahead with testing of hydrogen fuel cell vehicles. 

Even this year, news leaked that GM was considering launching a commercial fuel cell vehicle in 2015, despite lack of support for the hydrogen movement from U.S. President Barack Obama.  However, of late, the big automakers like Toyota and Honda have backed off the effort to push hydrogen vehicles onto the market.

A new study might put another road block in front of the prospect of a near term commercial hydrogen vehicle release, while giving the plug-in vehicle movement a nice boost.  The study was authored by Ryan McCarthy at the University of California, Davis and published in the Journal of Power Sources. The ground-breaking study, entitled "Determining marginal electricity for near-term plug-in and fuel cell vehicle demands in California: Impacts on vehicle greenhouse gas emissions", examines the emissions impact of hydrogen and plug-in vehicles versus their gas counterparts.

Lowering carbon emissions to fight warming, along with high fuel prices and global-political instability, has been a key driving factor for the adoption of hybrids and alternative fuels.  The new study, though, judged hydrogen vehicles to be an utter failure at that objective, in their current state.  The study concluded, "All of the pathways except for [fuel cell vehicles] using hydrogen from electrolysis reduce [greenhouse gas] emissions compared to ICEs and [hybrid electric vehicles]."

It doesn't dissuade further research into hydrogen vehicles; it simply indicates they are unlikely to be ready for showtime anytime soon.  It points out that steam methane reforming is a promising emerging method of hydrogen production that may one day allow hydrogen driven vehicles to actually live up to their emissions promises.

In the near term, the study finds that plug-in electric vehicles are the best option in terms of lowering carbon emissions.  Despite using electricity mostly generated by "relatively inefficient steam- and combustion-turbine plants" the well-to-wheel carbon impact of EVs is still significantly lower than hybrids.

While by no means the definitive study on the topic, the new work does much to fill in the gap in knowledge about what exactly the true impact of green vehicles are.  While the topic of on-the-road emissions has been well researched, there's been much less progress in examining the full lifetime impact of vehicles.  Now, that lifecycle has been examined in depth and EV advocates can put another feather in their caps, while hydrogen advocates are once again handed another setback.

The study may play a crucial role in forming the policy of California's Low Carbon Fuel Standard, an effort to reduce the carbon impact of transportation.  And given that President Barack Obama's Environmental Protection Agency has embraced California's emissions policy, the new study could have a profound impact on the course of regulations and the auto market nationally, as well.



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Doesn't surprise me...
By ninjit on 12/31/2009 2:50:32 PM , Rating: 3
The whole idea of Hydrogen has always seemed odd to me.
It was pushed by the oil companies, because it's a product that needs to be produced (i.e. they can replace oil with it as their cash cow).

But since hydrogen gas rarely occurs naturally (does it?), it has to be manufactured by electrolysis (from the power grid and all it's issues) or by fracturing of hydrocarbons (which begs the question, why not just burn the stuff directly)




RE: Doesn't surprise me...
By TSS on 12/31/2009 3:28:32 PM , Rating: 2
Both electricity and hydrogen don't solve the REAL problem: Where all that power is supposed to come from. Even nuclear won't cut it.

I guess where betting on fusion or bust here.


RE: Doesn't surprise me...
By rudolphna on 12/31/2009 3:41:22 PM , Rating: 2
Hydrogen actually occours naturally in unimaginable quantities. It is the most common element in the universe. But not on earth. If we could mine other planets, we could mine Jupiter for it's hydrogen. But it is very rare in unbonded form on earth.


RE: Doesn't surprise me...
By Solandri on 1/1/2010 1:31:19 AM , Rating: 2
quote:
(which begs the question, why not just burn the stuff directly)

Fuel cells extract energy from the chemical reaction electrically. This bypasses the ambient temperature-dependent efficiency limits imposed by thermodynamics upon straight chemical reactions. So a fuel cell can produce more usable energy than burning from the same amount of fuel.

Anyhow, hydrogen isn't a competitor as an energy source, since it consumes more energy to make it than it releases when converted back into water. It's a competitor with batteries and gasoline as an energy storage medium. Gasoline is very dense and lightweight, but chemical reactions with it give off all sorts of nasty byproducts. Batteries are clean, but store very little energy for their weight. The hope is (was) that hydrogen would allow denser energy storage than batteries without the byproducts of gasoline/diesel.


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