Well-to-Wheels Fossil Energy Consumption and CO2 Emissions of Hydrogen Fuel Cell Vehicles in China

Abstract

Hydrogen fuel cell vehicles (FCVs) have the advantage of high energy efficiency and zero tailpipe emissions. They have been progressively commercialized in recent years. Hydrogen production has diversified technological pathways, which vary greatly in terms of energy and environmental impacts. In this study, the life cycle assessment (LCA) method was applied to evaluate well-to-wheels (WTW) fossil energy consumption and carbon dioxide (CO2) emissions of FCVs using various hydrogen production pathways. The greenhouse gases, regulated emissions, and energy use in transportation (GREET) model, developed by the Argonne National Laboratory, was applied as the assessment tool, and a China-specific database was investigated and developed to evaluate typical hydrogen production pathways. Then, we compared the WTW fossil energy consumption and CO2 emissions of FCVs with those of gasoline vehicles (GVs), hybrid electric vehicles (HEVs), and battery electric vehicles (BEVs). The results indicated that renewable-energy-based electrolysis of water and biomass gasification are two prospective hydrogen production pathways with significant WTW energy and climate benefits which can help FCVs reduce fossil energy consumption and CO2 emissions by approximately 90% more than GVs. Among the current pathways with mass adoption, hydrogen production from coke oven gas (COG) has substantial energy and CO2 mitigation benefits, which enables FCVs to achieve a lower WTW fossil energy consumption than HEVs and lower WTW CO2 emissions than HEVs and BEVs. Considering the resource reserves and technological maturity in China, hydrogen production from COG and other industrial by-products is recommended for hydrogen energy and FCV development in the short term. In the medium and long terms, utilization of renewable energy to produce hydrogen should be promoted.