Abstract: The present disclosure discloses a gradient single-crystal positive electrode material, which has a chemical formula of LiNixCoyA1-x-yO2@mLiaZbOc, wherein 0<x<1, 0<y<1, 0<x+y<1, 0<m<0.05, 0.3<a?10, 1?b<4, and 1?c<15, A is at least one of Mn, Zr, Sr, Ba, W, Ti, Al, Mg, Y, and Nb, and Z is at least one of B, Al, Co, W, Ti, Zr, and Si. The atomic ratio of the content of Co on the surface of the single-crystal positive electrode material particle to the content of Ni+Co+A on the surface is greater than 0.4 and less than 0.8, and the atomic ratio of Co at a depth 10% of the radius from the surface of the single crystal positive electrode material particle is not less than 0.3; and the single-crystal positive electrode material particle has a roundness of greater than 0.4, and is free from sharp corners.

Abstract: Given developing resistance of tumor cells to current chemotherapeutic and targeted therapeutic agents, novel cancer therapies with enhanced potency and specificity are substantially required. Applicant has provided herein extracellular nanoparticle vesicles that redirect immune effector cells towards cancer cells for killing. Relative to conventional immunotherapeutic antibodies with defined orientation and geometry for their distinct antigen-binding arms, antibodies displayed on spherical exosomes can promote formation of immunological synapses as well as enhanced efficacy to activate immune cells.

Abstract: A membrane electrode with ultra-low oxygen mass transfer resistance includes an anode catalyst layer, a proton exchange membrane (PEM), and a cathode catalyst layer. A catalyst in the cathode catalyst layer is negatively charged, and the cathode catalyst layer is further doped with a negatively charged carbon carrier. A carbon carrier of the cathode catalyst layer in the membrane electrode is negatively charged, thereby optimizing the distribution of ionomers to achieve the purpose of reducing an oxygen mass transfer resistance in the cathode catalyst layer. In addition, an appropriate amount of the negatively charged carbon carrier is doped to increase a local oxygen concentration near active sites. In conclusion, the two methods of modifying with a negative charge and doping a negatively charged carbon carrier are used to optimize the local mass transfer resistance in an electrode and thus improve the cell performance.

Abstract: A fuel cell cathode catalyst layer structure for enhancing the durability of a catalyst is provided. The cathode catalyst layer structure includes a first catalyst portion, a second catalyst portion, and a third catalyst portion that are arranged in sequence from an area close to a diffusion layer to an area close to a proton exchange membrane (PEM); a pure platinum catalyst is placed inside the first catalyst portion, the second catalyst portion, and the third catalyst portion; platinum loads of the pure platinum catalysts inside the first catalyst portion, the second catalyst portion, and the third catalyst portion decrease progressively; and average particle sizes of pure platinum catalyst particles inside the first catalyst portion, the second catalyst portion, and the third catalyst portion increase progressively. The pure platinum catalyst with a large or small particle size is more resistant to corrosion, and improves the initial performance of fuel cell.

Abstract: The present invention provides a catalyst component for ethylene polymerization, a process for preparing the same, a catalyst comprising the same, and a process for polymerizing ethylene using the catalyst. The catalyst component comprises a reaction product, supported on an inorganic oxide support, of a magnesium complex, a titanium compound, an alcohol compound, and an organoaluminum compound, wherein said magnesium complex is formed by dissolving a magnesium halide in a solvent system comprising an organic epoxy compound and an organo phosphorus compound. The catalyst according to the invention is especially suitable for slurry phase polymerization of ethylene. The catalyst according to the present invention has high catalytic activity, and a good hydrogen response, with the resultant polymer having a more uniform particle size diameter and a narrow particle size distribution.

Abstract: The present invention provides a catalyst component for ethylene polymerization, a process for preparing the same, a catalyst comprising the same, and a process for polymerizing ethylene using the catalyst. The catalyst component comprises a reaction product, supported on an inorganic oxide support, of a magnesium complex, a titanium compound, an alcohol compound, and an organoaluminum compound, wherein said magnesium complex is formed by dissolving a magnesium halide in a solvent system comprising an organic epoxy compound and an organo phosphorus compound. The catalyst according to the invention is especially suitable for slurry phase polymerization of ethylene. The catalyst according to the present invention has high catalytic activity, and a good hydrogen response, with the resultant polymer having a more uniform particle size diameter and a narrow particle size distribution.