Year: 2024
Type: editorial
Abstract: Green hydrogen, produced through water electrolysis powered by renewable energy, is an essential component of future global energy systems.Green hydrogen is produced through water electrolysis powered by renewable energy sources, such as wind, solar, or hydropower, or possibly nuclear energy, resulting in low carbon emissions.1 While the CO₂ equivalent per kilogram of hydrogen produced (kgCO₂e/kgH₂) depends on many factors and requires a lifecycle analysis to assess.The U.S. Department of Energy's Section 45V tax credit targets green hydrogen at below 0.45 kgCO₂e/kgH₂.2 This requires minimizing emissions throughout the entire production process, including electricity use and upstream activities.These emissions are much lower than "gray" hydrogen from reforming natural gas (CH 4 + 2H 2 O → CO 2 + 4H 2 ) with ~10 kgCO₂e/kgH₂ and "blue" hydrogen using natural gas with carbon capture and ~4 kgCO₂e/kgH₂.3
Source: Chemical Reviews
Author: Shannon W. Boettcher
Language: English
Subfield: Energy Engineering and Power Technology
Field: Energy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4405287784