An innovative hydrogen production system that mimics the process of photosynthesis
An innovative hydrogen production system that mimics the process of photosynthesis
The world faces an increasing demand for clean and sustainable energy sources, including, for example, the production ofGreen hydrogen, and between the scientific community and the industrial community’s efforts to develop solar and wind energy technologies, scientists at the University of Rochester have resorted to the power of photosynthesis; To be inspired by an innovative way to generate energy.
In a research paper published in the journal “PNAS,” Rochester chemistry professors Kara Breen and Todd Krause explained that bacteria of the type “Shewanella oneidensis” offer a free and efficient way to provide the electrons needed by the artificial photosynthesis system.
Hydrogen is an ideal fuel
Hydrogen is an ideal fuel, an alternative to fossil fuels, especially if it is produced in a sustainable way. Because burning hydrogen fuel does not produce the same results as fossil fuels, which are characterized by the release of huge amounts of Greenhouse Gases (GHGs).
Hydrogen is the most abundant element in the universe, and can be extracted from a variety of sources, including water, natural gas, and biomass. Unlike fossil fuels, which produce Greenhouse Gases (GHGs) and other pollutants; When hydrogen is burned, it produces only one byproduct, which is water vapor.
Hydrogen fuel also has a high energy density, which means it contains a lot of energy per kilogram, compared to fossil fuels. It can also be used in a variety of applications, including fuel cells, opening doors for increased hydrogen production as a sustainable fuel.
Challenges in hydrogen use and production
Historically, scientists have extracted hydrogen either from fossil fuels or from water, but to achieve the latter more efficiently, an artificial photosynthesis system can help greatly.
During the process of natural photosynthesis, plants absorb sunlight, which they use to convert carbon dioxide and water into glucose and oxygen. In other words: light energy is converted into chemical energy for nutrition.
Similarly, artificial photosynthesis is the process of converting abundant raw materials and sunlight into chemical fuels. Systems that mimic photosynthesis require three components: a light absorber, a fuel-making catalyst, and an electron source. These systems are usually immersed in water, with a light source provided. This energy allows the catalyst to fuse the resulting electrons into the protons of the water (H+); Ultimately, hydrogen is produced in its pure form.
Rochester’s unique hydrogen production system
The Krauss and Brain groups have been working for about a decade to develop an efficient system that uses artificial photosynthesis in combination with semiconductor nanocatalysts. To absorb light.
One of the challenges researchers faced in producing hydrogen was discovering a source of electrons, as well as efficiently transferring these electrons to nanocrystals. Some other systems used ascorbic acid to generate the electrons needed for the system, and while this acid may seem inexpensive, the new system needs a free source of electrons, otherwise it will become very expensive.
Fortunately! In their paper, Krauss and Breen uncovered a potential – and unexpected – donor of electrons: bacteria. The researchers discovered that bacteria of the species Shewanella oneidensis could generate electrons for their system.
When bacteria grow under anaerobic conditions, they respire cellular materials as fuel, releasing electrons in the process. They then take the electrons generated from their internal metabolism and donate them to the external catalyst.
This research opens the door to many ambitious scenarios. For example, underground home tanks could use bacteria and solar radiation to produce small amounts of hydrogen. This allows people to run their homes and cars on inexpensive, clean fuel.
