Researchers develop approach to identify best organic solar cell mixtures
Finding the most efficient mixture of materials for organic solar cells is presently limited to a rather trial and error approach, as chemists analyze how the donor and acceptor molecules within the solar cell mix and interact on an already manufactured cell.
Looking for a shortcut towards achieving the right cell mixtures, researchers at the North Carolina State University and the Hong Kong University of Science and Technology have developed a new quantitative relation that can identify the most promising material combinations in organic solar cells, determining at what temperature two separate materials turn into one homogenous mixture.
Aware that attraction and repulsion at the molecular level depends on temperature, the researchers were utilizing secondary ion mass spectrometry and X-ray microscopy to look at molecular interactions at different temperatures, and to see when the phase change occurred.
X-ray scattering allowed them to examine the purity of the domains. The end result was a parameter and quantitative model that describes domain mixing as a function of temperature, and that can be used to evaluate different mixtures.
“This parameter gives chemists the solubility limit of the system, which will allow them to determine which processing temperature will give optimum performance with the largest processing window,” says Harald Ade, professor at NC State and corresponding author of the paper.
In addition to material pairs, the research, titled Quantitative relations between interaction parameter, miscibility and function in organic solar cells, published in scientific journal Nature Materials, offers an insight into optimal processing conditions.
“In principle, our method can do this for a given organic mixture at any temperature during the manufacturing process,” says first author, Long Ye from NC State.
The researcher says that the ultimate goal is to form a framework and experimental basis on which chemical structural variation might be evaluated by simulations on the computer, before laborious synthesis is attempted.
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[…] North Carolina State University (NCSU) has developed a continuous-flow reactor applying reusable photocatalyst and sunlight to extract hydrogen gas from its liquid organic carrier (LOHC) using less rhodium (Rh). The researchers achieved a 99% yield in three hours, reportedly eight times faster than conventional batch reactors. The room-temperature reactor resembles a thin, clear tube packed with micron-scale grains of titanium oxide (TiO2). The hydrogen-carrying liquid is pumped into one end of the tube. Only the outer grains of titanium oxide, the ones exposed to the sun at the other end of the tube, are coated with rhodium. These photoreactive catalysts react with the liquid carrier to release hydrogen molecules as a gas. “In a conventional batch reactor, 99% of the photocatalyst is titanium oxide, and 1% is rhodium. In our continuous flow reactor, we only need to use 0.025% rhodium, which makes a big difference in the final cost. A single gram of rhodium costs more than $500,” said Milad Abolhasani, corresponding author of the paper recently published in ChemSusChem. According to the researchers, the system should be easy to scale up or scale out to allow for catalyst reuse on a commercial scale. “You can simply make the tube longer or merge multiple tubes running in parallel.” The flow system can run continuously for up to 72 hours before losing efficiency. The catalyst can be “regenerated” without removing it from the reactor in about six hours. The system can then be restarted and run at full efficiency. […]
[…] North Carolina State College (NCSU) has developed a continuous-flow reactor making use of reusable photocatalyst and daylight to extract hydrogen fuel from its liquid natural provider (LOHC) utilizing much less rhodium (Rh). The researchers achieved a 99% yield in three hours, reportedly eight instances quicker than typical batch reactors. The room-temperature reactor resembles a skinny, clear tube full of micron-scale grains of titanium oxide (TiO2). The hydrogen-carrying liquid is pumped into one finish of the tube. Solely the outer grains of titanium oxide, those uncovered to the solar on the different finish of the tube, are coated with rhodium. These photoreactive catalysts react with the liquid provider to launch hydrogen molecules as a fuel. “In a traditional batch reactor, 99% of the photocatalyst is titanium oxide, and 1% is rhodium. In our steady move reactor, we solely want to make use of 0.025% rhodium, which makes an enormous distinction within the last price. A single gram of rhodium prices greater than US $ 500, “mentioned Milad Abolhasani, corresponding creator of the paper not too long ago printed in ChemSusChem. In line with the researchers, the system needs to be simple to scale up or scale out to permit for catalyst reuse on a business scale. “You’ll be able to merely make the tube longer or merge a number of tubes operating in parallel.” The move system can run constantly for as much as 72 hours earlier than dropping effectivity. The catalyst may be “regenerated” with out eradicating it from the reactor in about six hours. The system can then be restarted and run at full effectivity. […]
[…] North Carolina State College (NCSU) has developed a continuous-flow reactor making use of reusable photocatalyst and daylight to extract hydrogen fuel from its liquid natural provider (LOHC) utilizing much less rhodium (Rh). The researchers achieved a 99% yield in three hours, reportedly eight instances sooner than standard batch reactors. The room-temperature reactor resembles a skinny, clear tube full of micron-scale grains of titanium oxide (TiO2). The hydrogen-carrying liquid is pumped into one finish of the tube. Solely the outer grains of titanium oxide, those uncovered to the solar on the different finish of the tube, are coated with rhodium. These photoreactive catalysts react with the liquid provider to launch hydrogen molecules as a fuel. “In a traditional batch reactor, 99% of the photocatalyst is titanium oxide, and 1% is rhodium. In our steady movement reactor, we solely want to make use of 0.025% rhodium, which makes an enormous distinction within the remaining value. A single gram of rhodium prices greater than US $ 500, “stated Milad Abolhasani, corresponding creator of the paper not too long ago revealed in ChemSusChem. In line with the researchers, the system must be straightforward to scale up or scale out to permit for catalyst reuse on a business scale. “You may merely make the tube longer or merge a number of tubes working in parallel.” The movement system can run repeatedly for as much as 72 hours earlier than dropping effectivity. The catalyst might be “regenerated” with out eradicating it from the reactor in about six hours. The system can then be restarted and run at full effectivity. […]
[…] North Carolina State University (NCSU) has developed a continuous-flow reactor applying reusable photocatalyst and sunlight to extract hydrogen gas from its liquid organic carrier (LOHC) using less rhodium (Rh). The researchers achieved a 99% yield in three hours, reportedly eight times faster than conventional batch reactors. The room-temperature reactor resembles a thin, clear tube packed with micron-scale grains of titanium oxide (TiO2). The hydrogen-carrying liquid is pumped into one end of the tube. Only the outer grains of titanium oxide, the ones exposed to the sun at the other end of the tube, are coated with rhodium. These photoreactive catalysts react with the liquid carrier to release hydrogen molecules as a gas. “In a conventional batch reactor, 99% of the photocatalyst is titanium oxide, and 1% is rhodium. In our continuous flow reactor, we only need to use 0.025% rhodium, which makes a big difference in the final cost. A single gram of rhodium costs more than $500,” said Milad Abolhasani, corresponding author of the paper recently published in ChemSusChem. According to the researchers, the system should be easy to scale up or scale out to allow for catalyst reuse on a commercial scale. “You can simply make the tube longer or merge multiple tubes running in parallel.” The flow system can run continuously for up to 72 hours before losing efficiency. The catalyst can be “regenerated” without removing it from the reactor in about six hours. The system can then be restarted and run at full efficiency. […]
[…] North Carolina State University (NCSU) has developed a continuous-flow reactor applying reusable photocatalyst and sunlight to extract hydrogen gas from its liquid organic carrier (LOHC) using less rhodium (Rh). The researchers achieved a 99% yield in three hours, reportedly eight times faster than conventional batch reactors. The room-temperature reactor resembles a thin, clear tube packed with micron-scale grains of titanium oxide (TiO2). The hydrogen-carrying liquid is pumped into one end of the tube. Only the outer grains of titanium oxide, the ones exposed to the sun at the other end of the tube, are coated with rhodium. These photoreactive catalysts react with the liquid carrier to release hydrogen molecules as a gas. “In a conventional batch reactor, 99% of the photocatalyst is titanium oxide, and 1% is rhodium. In our continuous flow reactor, we only need to use 0.025% rhodium, which makes a big difference in the final cost. A single gram of rhodium costs more than $500,” said Milad Abolhasani, corresponding author of the paper recently published in ChemSusChem. According to the researchers, the system should be easy to scale up or scale out to allow for catalyst reuse on a commercial scale. “You can simply make the tube longer or merge multiple tubes running in parallel.” The flow system can run continuously for up to 72 hours before losing efficiency. The catalyst can be “regenerated” without removing it from the reactor in about six hours. The system can then be restarted and run at full efficiency. […]
[…] North Carolina State University (NCSU) has developed a continuous-flow reactor applying reusable photocatalyst and sunlight to extract hydrogen gas from its liquid organic carrier (LOHC) using less rhodium (Rh). The researchers achieved a 99% yield in three hours, reportedly eight times faster than conventional batch reactors. The room-temperature reactor resembles a thin, clear tube packed with micron-scale grains of titanium oxide (TiO2). The hydrogen-carrying liquid is pumped into one end of the tube. Only the outer grains of titanium oxide, the ones exposed to the sun at the other end of the tube, are coated with rhodium. These photoreactive catalysts react with the liquid carrier to release hydrogen molecules as a gas. “In a conventional batch reactor, 99% of the photocatalyst is titanium oxide, and 1% is rhodium. In our continuous flow reactor, we only need to use 0.025% rhodium, which makes a big difference in the final cost. A single gram of rhodium costs more than $500,” said Milad Abolhasani, corresponding author of the paper recently published in ChemSusChem. According to the researchers, the system should be easy to scale up or scale out to allow for catalyst reuse on a commercial scale. “You can simply make the tube longer or merge multiple tubes running in parallel.” The flow system can run continuously for up to 72 hours before losing efficiency. The catalyst can be “regenerated” without removing it from the reactor in about six hours. The system can then be restarted and run at full efficiency. […]
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