Energy is central to achieve the interrelated economic, social, and environmental aims of sustainable human development. But if we are to realize this important goal, the kinds of energy we produce and the ways we use them will have to change. Otherwise, environmental damage will accelerate, inequities will increase, and global economic growth will be jeopardized. The need for renewable energy sources has been emphasized by the global environmental issues widely recognized recently. Hydrogen is very attractive for the future because it is renewable as an energy resource and it's also flexible as an energy carrier (Midilli et al., 2008). One of remarkable methods for large scale hydrogen production is water-splitting through thermochemical cycles. The iodine-sulfur process (IS process) is very promising and expected
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