4 results about "Mass activity" patented technology

This paper discloses a 3d transition metal M-rare earth metal R bicomponent carbon-supported Pt catalyst, its preparation method, and its application. It relates to the catalyst supported on carbon doped with Pt, its preparation method, and its application. This catalyst aims to address the poor catalytic activity and stability of existing Pt / C catalysts. The catalyst consists of Pt nanoparticles supported on an M-R bicomponent carbon support, where M is Fe, Co, Ni, or Zn, and R is Ce, Nd, or Gd. Preparation method: M and R ions are complexed with a nitrogen source ligand on a carbon surface and then carbonized at high temperature to obtain the M-R bicomponent carbon support. Then, Pt is loaded using a microwave reduction method to obtain the M-R bicomponent carbon-supported Pt catalyst. The mass activities of Pt / Fe-Ce-NC and Pt / Co-Ce-NC are 0.27 and 0.22 A / mg, respectively. Pt It is 2.8 and 2.3 times that of Pt / C, and can be used in the field of proton exchange membrane fuel cells.

This invention discloses an anode catalyst for high-concentration formic acid fuel cells, and for the first time synthesizes a three-dimensional Pt / Bi₂Te₃ nanocomposite material with a width of 600–900 nm and a thickness of 55–80 nm. Its performance at 0.1 mol / L... ‑1 Perchloric acid and 3.0 mol L ‑1 The mass activity of formic acid oxidation in a mixed formic acid solution is 8.2 A mg. ‑1 The surface activity is 11.8 mA cm⁻¹. ‑2 These figures are 15.7 and 13.1 times higher than those of commercially available carbon-supported platinum, respectively. In stability testing, the three-dimensional Pt / Bi₂Te₃ nanocomposite exhibited a residual activity of 1.33 A mg after a 3600 s iterative test. ‑1 It is 221.6 times that of commercial Pt / C. At 15.0 mol L⁻¹ ‑1 In a practical direct formic acid fuel cell using formic acid as fuel, the peak power density of the three-dimensional Pt / Bi₂Te₃ nanocomposite material is 156.1 mW / cm². ‑2 The peak power density of commercially available carbon-supported platinum is only 77.0 mW / cm². ‑2 .

This invention discloses a gold-based gas diffusion electrode and its preparation method for the electrochemical synthesis of hydrogen peroxide, belonging to the field of electrochemical catalysis and synthesis technology. The gold-based gas diffusion electrode comprises a polyethylene film substrate and a gold catalyst layer supported on the substrate surface. The gold catalyst layer is formed in situ by magnetron sputtering and has a crystal structure with gold {200} crystal planes as the main exposed or predominantly oriented crystal planes. By controlling the sputtering deposition conditions, gold layer thickness, and interface structure, a gas diffusion electrode with low gold loading, high oxygen transport efficiency, and high two-electron oxygen reduction selectivity can be obtained. When used for the oxygen reduction electrosynthesis of hydrogen peroxide, this electrode can achieve high hydrogen peroxide selectivity, mass activity, and operational stability with relatively low amounts of noble metals. The preparation method of this invention is simple, requires no complex post-processing or additional binders, and is suitable for the electrochemical synthesis of hydrogen peroxide in acidic, neutral, or alkaline electrolyte systems.

This invention discloses a method for preparing and applying phosphorus-doped palladium-molybdenum alloy ultrathin two-dimensional nanomaterials. The nanomaterials are prepared via a wet chemical method, exhibiting good dispersibility and a thin, curved two-dimensional structure with a lateral dimension of several hundred nanometers and a thickness of approximately 1.2 nanometers. Catalysts prepared by combining phosphorus-doped palladium-molybdenum alloy ultrathin two-dimensional nanomaterials with carbon are applied to the electrocatalytic oxidation of alcohols, demonstrating excellent activity and stability for various alcohols. The mass activities for the electrocatalytic oxidation of methanol, ethanol, ethylene glycol, and glycerol reach as high as 2.32 Å mg, respectively. ‑1 Pd 4.95A mg ‑1 Pd 4.06 mg ‑1 Pd 4.98A mg ‑1 Pd The phosphorus-doped palladium-molybdenum alloy ultrathin two-dimensional nanomaterial catalyst disclosed in this invention can greatly reduce catalyst costs and improve electrocatalytic alcohol oxidation performance, showing promising application prospects in the field of alkaline direct alcohol fuel cells.