A thermochemical energy storage system and method of storing thermal energy are disclosed. The energy storing system described herein comprises a reactor comprising a CO.sub.2 sorbent comprising i) CaO and mayenite or ii) Li.sub.4SiO.sub.4, or a combination thereof, and b) a CO.sub.2 source, wherein the CO.sub.2 source is in fluid communication with the reactor to allow flow of CO.sub.2 between the CO.sub.2 source and the reactor. Further, methods are disclosed for storing thermal energy through a wide temperature range.

A thermochemical energy storage system and method of storing thermal energy are disclosed. The energy storing system described herein comprises a reactor comprising a CO.sub.2 sorbent comprising i) CaO and mayenite or ii) Li.sub.4SiO.sub.4, or a combination thereof, and b) a CO.sub.2 source, wherein the CO.sub.2 source is in fluid communication with the reactor to allow flow of CO.sub.2 between the CO.sub.2 source and the reactor. Further, methods are disclosed for storing thermal energy through a wide temperature range.

A method for capturing and sequestering carbon dioxide (CO.sub.2) includes receiving and performing an electrochemical process on the input liquid including water and a salt to produce at least one hydroxide-rich stream, and then capturing CO.sub.2 from air using the hydroxide-rich stream and a passive air capture system, thereby producing a liquid carbonate solution containing air-captured CO.sub.2. Optional steps include disposing of the liquid carbonate solution, precipitating air-captured CO.sub.2 from the liquid carbonate solution as solid carbonate and/or a slurry of carbonate, and mixing the liquid carbonate solution with a hydrogen-rich stream produced by the electrochemical process to generate gaseous CO.sub.2. Various integrations and synergies among CO.sub.2 capture, renewable energy, water desalination, and metal and mineral extraction are provided.

A method for capturing and sequestering carbon dioxide (CO.sub.2) includes receiving and performing an electrochemical process on the input liquid including water and a salt to produce at least one hydroxide-rich stream, and then capturing CO.sub.2 from air using the hydroxide-rich stream and a passive air capture system, thereby producing a liquid carbonate solution containing air-captured CO.sub.2. Optional steps include disposing of the liquid carbonate solution, precipitating air-captured CO.sub.2 from the liquid carbonate solution as solid carbonate and/or a slurry of carbonate, and mixing the liquid carbonate solution with a hydrogen-rich stream produced by the electrochemical process to generate gaseous CO.sub.2. Various integrations and synergies among CO.sub.2 capture, renewable energy, water desalination, and metal and mineral extraction are provided.

To provide a non-aqueous electrolyte electricity-storage element including a positive electrode including a positive-electrode active material capable of inserting and releasing anions, a negative electrode including a negative-electrode active material capable of inserting and releasing cations, and a non-aqueous electrolyte, wherein the positive-electrode active material is porous carbon having pores having a three-dimensional network structure, and wherein a changing rate of a cross-sectional thickness of a positive electrode film including the positive-electrode active material defined by Formula (1) below is less than 45%.

The present invention relates to the use of solid metal materials for catalyzing the hydration of carbon dioxide. It also relates to methods of and apparatus for hydrating carbon dioxide and capturing carbon. The solid metal materials may be nickel nanoparticles. The invention finds particular application in the sequestration of carbon dioxide either at the point of release or from the atmosphere.

Carbonate pigment compositions are provided. In some instances, the pigment compositions are CO2 sequestering pigment compositions. Also provided are methods of making and using the pigment compositions, e.g., in paints and coatings, as well as other applications.

The present disclosure discloses a method for preparing a labelled plant and a method for preparing a labelled biochar. The method for preparing a labelled plant includes the following steps: preparing a box; placing a plant that is capable of photosynthesis in the box; preparing a labelled gas in the box, the labelled gas being an isotope-labelled carbon dioxide gas; and leaving the box standing for a preset period of time, during which the plant absorbs the labelled gas to obtain a labelled plant. In the present disclosure, the carbon element in the plant is labelled during the growth of the plant, and the concentration of .sup.13CO.sub.2 in the box is controlled by controlling the concentration of Na.sub.2.sup.13CO.sub.3, where .sup.13CO.sub.2 is prepared by chemical methods, which could improve the utilization rate of .sup.13C.

The present disclosure discloses a method for preparing a labelled plant and a method for preparing a labelled biochar. The method for preparing a labelled plant includes the following steps: preparing a box; placing a plant that is capable of photosynthesis in the box; preparing a labelled gas in the box, the labelled gas being an isotope-labelled carbon dioxide gas; and leaving the box standing for a preset period of time, during which the plant absorbs the labelled gas to obtain a labelled plant. In the present disclosure, the carbon element in the plant is labelled during the growth of the plant, and the concentration of .sup.13CO.sub.2 in the box is controlled by controlling the concentration of Na.sub.2.sup.13CO.sub.3, where .sup.13CO.sub.2 is prepared by chemical methods, which could improve the utilization rate of .sup.13C.

A method for producing metal carbonate is disclosed. The method includes the following steps of providing a first mixture of metal and a catalyst containing iron, NO groups, and N-containing ligands first; then introducing carbon dioxide to the first mixture to form a second mixture and obtaining a product. The method described here can improve the yield and decrease the cost of metal carbonate production.