G-7

 

Depiction of the most promising sulfur thermochemical cycles for water splitting,

 

214

G-8

 

Estimated thermal-to-hydrogen efficiency (ηH) of the sulfur-iodine (SI) process and thermal energy required to produce a kilogram of hydrogen from the modular high-temperature reactor-SI technology,

 

215

G-9

 

Electrolysis cell stack energy consumption as a function of cell stack current density,

 

220

G-10

 

Sensitivity of the cost of hydrogen from distributed electrolysis to the price of input electricity,

 

223

G-11

 

Wind generating capacity, 1981–2002, world and U.S. totals,

 

225

G-12

 

Hydrogen from wind power availability,

 

226

G-13

 

Efficiency of biological conversion of solar energy,

 

230

G-14

 

Geographic distribution of projected bioenergy crop plantings on all acres in 2008 in the production management scenario,

 

231

G-15

 

Best research cell efficiencies for multijunction concentrator, thin-film, crystalline silicon, and emerging photovoltaic technologies,

 

236



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