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The potential of using hydrogen as a sustainable energy carrier is attributedto its high energy density and its utilization without CO$_2$ emissions.Existing technologies mainly produce hydrogen thermochemically via natural gasreforming or electrochemically through water splitting. Organic solidfeedstocks rich in hydrogen, such as biomass and plastic waste, areunder-utilized for this purpose. Approaches based on low-temperatureatmospheric pressure plasma powered by renewable electricity could lead to theproduction of green hydrogen more viably than current approaches, leading tosustainable alternatives for upcycling plastic and biomass waste. This doctoralresearch dissertation focuses on the production of hydrogen from solids viaatmospheric nonthermal plasma. First, two low-temperature atmospheric pressureplasma reactors, based on transferred arc (transarc) and gliding arc (glidarc)discharges and depicting complementary operational characteristics, aredesigned, built, and characterized to produce hydrogen from low-densitypolyethylene (LDPE) as a model plastic waste. Experimental results show thathydrogen production rate and efficiency increase monotonically with increasingvoltage level in both reactors. Despite the reactors' markedly different modesof operation, their hydrogen production performance metrics are comparable.

Hydrogen production from polymeric organic solids via atmospheric pressure nonthermal Plasma