Hydrogen economy cycle

Schematic representation of the hydrogen economy cycle. Hydrogen is used as an energy carrier of solar energy to end-users. 

AECL is developing a supercritical heavy water moderated nuclear reactor (SCWR) [2] based on its successful CANDU reactor system currently deployed around the world. Since the Mark 2 [2] version of the heavy water moderated SCWR can satisfy the temperature requirements of the hybrid Cu-Cl cycle, AECL is collaborating with ANL in the development of this cycle. Also, AECL is particularly interested in this process since some of its hydrogen-economy related technologies are a good match for the developmental needs of this process, in particular for the development of the electrochemical step involved. 

The hydrogen cycle in an ammonia-mediated hydrogen economy (adapted from Sprensen eta ., 2007). 

A conceivable intermediate step for the transition to a comprehensive hydrogen economy is the concentration on a low-energy economy with minimum CO2 emissions into the atmosphere using local excess potentials of electricity, e.g., renewables such as hydro, and wind or cheap off-peak electricity in the day/night, working day/weekend, or winter/summer cycles. 

Doctor, R.D, Matonis, D.T, Wade, DC. (2003), Hydrogen Generation Using a Calcium Bromine Thermochemical Water Splitting Cycle, Symposium on Nuclear Energy and the Hydrogen Economy, MIT, Cambridge, MA. 

FIGURE 21.27 Hydrogen crossover current density under the long-term RH cycling comparison between Nafion cast membrane and reinforced membrane. (From Choudhury, B., Material challenges in proton exchange membrane fuel cells. International Symposium on Material Issues in a Hydrogen Economy, November 12-15, Richmond, VA, 2007.)... 

John Stringer Electricity is a wonderful thing but is difficult to store. I would like to see the whole business of where you store things in the overall cycle addressed. As we move toward a hydrogen economy, this is going to become particularly important. Hydrogen is extremely difficult to store, electrons are very difficult to store, and some further work in these areas would transform the economies of some of the things that we can t do yet. 

Compressed-air energy storage Corporate average fuel economy California Air Resources Board Coal-bed methane Combined cycle gas turbine Carbon/carbon dioxide capture and storage Clean development mechanism Chlorofluorocarbon Computable general equilibrium Compressed gaseous hydrogen Combined heat and power... 

Our Future Economy May Be Based on Hydrogen Electricity-producing hydroelectric dams depend on the water cycle, which is driven by solar radiation. Windmills harness wind to produce electricity and also to pump water, and... 

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