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Rapid growth of world population and economic activities continue to cause the increase of anthropogenic greenhouse gases (GHG) emissions. To mitigate GHG emissions and limit global warming, researchers and practitioners around the globe search for clean energy solutions. Many researchers believe that hydrogen (H2), with its high energy density, has a promising potential. Yet, practical implementation of H2-based energy generation faces technical and economic challenges. So far, over 95% of global hydrogen product...