Approximately 100 square meters This space-consuming reactor uses special photocatalytic panels to split water molecules into hydrogen and oxygen. The process consists of two stages: In the first step, oxygen is separated, and in the second step, hydrogen atoms are separated. The separated hydrogen can be stored as a clean fuel and used in vehicles, generators and other machines.
This system takes a different approach than existing “one-step” catalyst methods. In traditional methods, water is directly separated into hydrogen and oxygen, but this process is not sustainable due to both energy inefficiency and the use of natural gas.
Researchers state that the scale of the reactor should be enlarged and more efficient photocatalysts should be developed. Kazunari Domen, the lead author of the study, stated that reaching a practical level of efficiency of this technology will accelerate the infrastructure, laws and regulations regarding hydrogen fuel production. “The conversion efficiency of photocatalysts from solar energy to chemical energy is the most important point. Once this is improved, many researchers will seriously work on the development of mass production technology and gas separation processes, as well as large-scale plant construction.” says Domen.
Despite remaining technical hurdles, the concept shows great promise. If scientists can refine catalysts and scale up reactors, fuel could be produced cleanly and sustainably from two of the most abundant resources on Earth.
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