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High CO2 hydration activity carbonic anhydrase'

This technology is about chimeric carbonic anhydrase derived from Dunaliella salina.

When trying to apply protein as a biocatalyst for removal and conversion of existing carbon dioxide, the low yield of Dsp-CA-c became a problem. To solve this problem, we propose carbonic anhydrase [Dsp-nCA-c] containing the amino acid sequence shown in SEQ ID NO: 4. The chimeric proteins Dsp-nCA-c and Dsp-nCA-c (G263S) of the invention show higher water-soluble expression and CO2 hydration activity than the existing Dsp-CA-c. The two proteins of this technology show increased soluble expression and CO2 hydration activity in Dsp-CA and CO2 mineralization, so they can be used in the CO2 removal process using CA catalysts and the production of various industrial raw materials using CO2 mineralization. They can also be used as catalysts in the synthesis of useful metabolites to increase synthesis yield.

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Key Features:

• Carbonic anhydrase containing the amino acid sequence shown in SEQ ID NO: 4 [Dsp-nCA-c]
• Carbonic anhydrase containing the amino acid sequence shown in SEQ ID NO: 5 [Dsp-nCA-c(G263S)]
• Capture of carbon dioxide containing carbonic anhydrase or Fixation
• Increase the amount of soluble expression by fusing part of the amino terminus to a protein with low soluble expression, such as Dsp-CA-c.

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This technology was developed through research support from the Korea Institute for Ocean Science and Technology Promotion for the development of marine silica biomineral-based synthetic bone graft materials.

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Carbon precursor cathode electrode with improved electrical conductivity

This technology is related to a method of manufacturing a cathode electrode including a carbon structure with a three-dimensional network structure.

The goal to solve is to provide a cathode electrode with improved electrical conductivity during charging and discharging. To this end, we propose a carbon precursor cathode with a three-dimensional network structure in which main fibers randomly cross each other.

The lithium secondary battery into which the cathode electrode according to this technology is inserted performs a long charge and discharge cycle. Meanwhile, it shows excellent characteristics of improved CE (coulombic efficiency) and stability due to the pores and chalcogen functional groups provided on the surface and inside of the main fiber of the cathode electrode.

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Key Features:

• The core principle is a three-dimensional network structure in which the main fibers of the carbon structure randomly intersect each other.
• Provides secondary pores and chalcogen functional groups larger than the size of the primary pores on the surface and inside the main fibers.
• Chalcogen functional groups contain chalcogen elements (S, Te, Se), carbon, or oxygen.
• During charge-discharge cycles, the generation of byproducts containing Li2CO3 is reduced due to the chalcogen functional groups within the cathode electrode.

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This technology was developed through research support from the National Research Foundation of Korea to identify the formation mechanism and redox characteristics of highly functional pyropolymers rich in pi electrons.

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Dentrite-suppressed mesoporous structure cathode electrode

This technology is related to metal cathode electrodes and secondary batteries using them.

The problem that this technology aims to solve is a metal cathode electrode with suppressed dendrite growth. To this end, we propose a mesoporous structure in which the surface area is increased by nanopores on the inner surface of the concave part.

This technology not only inhibits the growth of lithium ions into lithium metal dendrites by nanopores and oxygen functional groups, but also suppresses the generation of by-products within the cathode electrode, and the effect of this is to prevent long-term charge and discharge cycles. It has outstanding advantages of high efficiency and stability.

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Key Features:

• Among the concave and convex portions of the metal substrate structure, selectively form nanopores and oxygen functional groups within the concave portion
• Make the inner surface of the concave portion lithiophilic and provide an oxidizing solution to the metal substrate structure
• Provide a mask on the convex portion of the metal substrate structure
• The inner surface of the concave portion has a mesoporous structure by nanopores have

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This technology was developed through the support of the National Research Foundation of Korea's research project to identify the formation mechanism and redox characteristics of highly functional pyropolymers rich in pi electrons.

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Shuttle effect suppressing telulium nanotube electrode active material

This technology relates to an electrode active material containing tellurium nanotubes with a conductive polymer layer and a method of manufacturing electrodes for secondary batteries.

The technology of using sodium, aluminum, zinc, etc. in the negative electrode is attracting attention as it increases the stability of secondary batteries and is highly price competitive, but there is a problem in that intermediate materials dissolve in the electrolyte during the charging and discharging process, creating a shuttle effect that travels between both electrodes. In order to solve this problem, this technology proposes a technology to synthesize tellurium material in the form of nanotubes and coat it with a conductive polymer.

By using tellurium nanotubes formed with a conductive polymer layer through this technology as an electrode active material, it is more economical than the existing technology of manufacturing electrode active materials by supporting them in a host material to suppress the elution of intermediate materials, and can further contribute to commercialization. The advantage is that the specific gravity of the active material in the electrode does not decrease, increasing energy density. There is.

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Key Features:

• The core principle is a conductive polymer layer formed between tellurium nanotubes, which are formed by stacking tellurium atoms.
• Polypyrrole, polyaniline, polyacetylene, and polyphenylene vinylene (PPV) are used as conductive polymers.
• At the interface between the conductive polymer layer and the tellurium nanotubes, tellurium particles are encapsulated within the conductive polymer matrix.
• Tellurium nanotubes have a hexagonal prism structure formed by single-walls.

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Stability-enhanced material for lithium metal anode

This technology is about the manufacturing method of the electrode material for the negative electrode of lithium metal secondary battery.

The use of lithium metal as the negative electrode for high-performance next-generation secondary batteries is attracting attention, but it has stability problems such as ignition and explosion due to dendrite metal growth. To solve these problems, this technology proposes a method of synthesizing nitrogen-doped pseudo-capacitance nanocarbon through arc discharge.

This technology proposes a method of synthesizing nitrogen-doped pseudo-capacitance nanocarbon through arc discharge. It is expected to contribute to the development of the secondary battery industry as a groundbreaking lithium metal secondary battery anode electrode that can not only improve the performance of secondary batteries by reducing phase transition resistance and concentration resistance, but also secure high coulombic efficiency and stability even during repeated charge and discharge cycling through secondary battery electrodes with a solid electrolyte interface layer with high ion conductivity.

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Key Features:

• Synthesis of pseudo-capacitance nanocarbon doped with nitrogen through arc discharge on graphite material
• Performing pre-lithiation process based on lithium metal on nanocarbon
• Nanocarbon with doped three-dimensional nano-porous structure
• Formation of lithium-containing inorganic solid electrolyte interfacial layer (L I-SEI) on the surface of nanocarbon

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This technology was developed through the support of the National Research Foundation of Korea's research project to identify the formation mechanism and redox characteristics of highly functional pyropolymers rich in pi electrons.

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Manufacture of anti-deterioration lithium-air batteries

This technology relates to an oxidation-reduction catalyst for a metal-air battery, an air electrode, and a membrane-electrode assembly for a metal-air battery including the same.

Lithium-air batteries have an energy density that is more than 10 times higher than existing lithium batteries, making them promising as next-generation secondary batteries. However, there is a problem in that current density and lifespan characteristics deteriorate when lithium oxide (Li2O2) accumulates through repeated charging and discharging. To solve this problem, this technology proposes a method to reduce the permeation of redox mediator (RM) through the separation membrane.

This technology can not only improve the performance of metal-air batteries by reducing the permeation of redox mediators through the separator during charging and discharging, but also prevent the crossover phenomenon of redox mediators.

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Key Features:

• The oxidation-reduction catalyst for a metal-air battery is a binder and a redox mediator
• The first gel electrolyte is a fluorine-based polymer, a lithium precursor, and an ionic liquid
• The second gel electrolyte is a fluorine-based polymer, a lithium precursor, an ionic liquid, and an additive
• Hexagonal boron nitride, aluminum oxide (Al2O3), Carbon nanotubes (CNT) and silicon oxide (SiO2) are used as additives

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This technology was developed through support from the National Research Foundation of Korea's research project for a high current density water electrolysis system using a lithium ion exchange membrane.

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