In response to the lack of a unified accounting method for quantifying the carbon footprint of green hydrogen in China

this paper compares and analyzes the domestic and international standards for accounting the carbon footprint of green hydrogen. A carbon footprint quantification model covering the full life cycle

including green power production and output

electrolytic water hydrogen production

hydrogen storage

and hydrogen transportation

is established

and carbon footprint accounting is carried out on actual cases. The research results show that hydrogen production through electrolysis of water using wind power has a lower carbon emission than that of using photovoltaic power. Suggestions are also put forward

such as improving the energy efficiency of electrolyzers

optimizing the hydrogen storage and transportation processes

and increasing research and development efforts on new electrolysis technologies.