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Traditional seawater power generation generally uses tides, waves or sea temperature differences
.
However, a research team at Osaka University in Japan has developed a new photocatalytic method that can use sunlight to turn seawater into hydrogen peroxide, which is then used to generate electricity in fuel cells, with an overall photoelectric conversion efficiency of 0.
28%, comparable
to biomass energy switchgrass.
In a recent paper published in the journal Nature Communications, the researchers pointed out that solar energy fluctuates greatly from day to night, and in order to harness solar energy at night, it needs to be converted into chemical energy for storage
.
Hydrogen peroxide in water is a promising solar fuel that can be used to generate electricity in fuel cells, with only oxygen and water
as by-products.
In this study, the team developed a new photoelectrochemical cell that can produce hydrogen peroxide, which uses tungsten trioxide as a photocatalyst to absorb photon energy and undergo chemical reactions when exposed to sunlight, eventually producing hydrogen
peroxide.
After 24 hours of light, the concentration of seawater hydrogen peroxide in the battery can reach 48 mmol/L, far exceeding the concentration of 2 mmol/L previously obtained in pure water, which is enough to support the operation
of hydrogen peroxide fuel cells.
The main reason for the increase in concentration is that chloride ions in seawater increase the activity
of the photocatalyst.
According to the test, the overall photoelectric conversion efficiency of the system reaches 0.
28%, the efficiency of hydrogen peroxide from seawater through photocatalytic reaction is 0.
55%, and the efficiency of fuel cell is 50%.
The researchers point out that the overall efficiency of this form of power generation, although not inferior to other photovoltaic energy sources, such as switchgrass (0.
2%), is still far lower than traditional solar cells
.
It is hoped that better photoelectrochemical cell materials can be found in the future to further improve efficiency and reduce costs
.
Shunichi Fukusumi of Osaka University's Department of Materials and Life Sciences said seawater is the most abundant resource
on earth that can produce hydrogen peroxide.
Most fuel cells currently use liquid hydrogen peroxide rather than hydrogen, because liquid hydrogen peroxide is easier to store in a high-density form and safer
.
"In the future, we intend to develop new methods for producing hydrogen peroxide from seawater on a large scale and at low cost, replacing existing high-cost production methods
.
"
Traditional seawater power generation generally uses tides, waves or sea temperature differences
.
However, a research team at Osaka University in Japan has developed a new photocatalytic method that can use sunlight to turn seawater into hydrogen peroxide, which is then used to generate electricity in fuel cells, with an overall photoelectric conversion efficiency of 0.
28%, comparable
to biomass energy switchgrass.
In a recent paper published in the journal Nature Communications, the researchers pointed out that solar energy fluctuates greatly from day to night, and in order to harness solar energy at night, it needs to be converted into chemical energy for storage
.
Hydrogen peroxide in water is a promising solar fuel that can be used to generate electricity in fuel cells, with only oxygen and water
as by-products.
In this study, the team developed a new photoelectrochemical cell that can produce hydrogen peroxide, which uses tungsten trioxide as a photocatalyst to absorb photon energy and undergo chemical reactions when exposed to sunlight, eventually producing hydrogen
peroxide.
After 24 hours of light, the concentration of seawater hydrogen peroxide in the battery can reach 48 mmol/L, far exceeding the concentration of 2 mmol/L previously obtained in pure water, which is enough to support the operation
of hydrogen peroxide fuel cells.
The main reason for the increase in concentration is that chloride ions in seawater increase the activity
of the photocatalyst.
According to the test, the overall photoelectric conversion efficiency of the system reaches 0.
28%, the efficiency of hydrogen peroxide from seawater through photocatalytic reaction is 0.
55%, and the efficiency of fuel cell is 50%.
The researchers point out that the overall efficiency of this form of power generation, although not inferior to other photovoltaic energy sources, such as switchgrass (0.
2%), is still far lower than traditional solar cells
.
It is hoped that better photoelectrochemical cell materials can be found in the future to further improve efficiency and reduce costs
.
Shunichi Fukusumi of Osaka University's Department of Materials and Life Sciences said seawater is the most abundant resource
on earth that can produce hydrogen peroxide.
Most fuel cells currently use liquid hydrogen peroxide rather than hydrogen, because liquid hydrogen peroxide is easier to store in a high-density form and safer
.
"In the future, we intend to develop new methods for producing hydrogen peroxide from seawater on a large scale and at low cost, replacing existing high-cost production methods
.
"
