3 results about "Formic acid oxidation" patented technology

The application belongs to the technical field of catalysts, and provides a one-dimensional platinum-based catalyst, a preparation method and application thereof. The one-dimensional platinum-based catalyst has a nanorod structure and is a platinum-tellurium-bismuth catalyst or a bismuth-doped platinum-tellurium catalyst. The preparation method comprises the following steps: (1) in the presence of a dispersing agent, performing a hydrothermal reaction on a platinum precursor, a tellurium precursor, a bismuth precursor and ascorbic acid in an aqueous solvent to form a platinum-tellurium-bismuth ternary heterogeneous phase alloy; (2) loading the platinum-tellurium-bismuth ternary heterogeneous phase alloy on a carbon material to obtain a platinum-tellurium-bismuth catalyst; optionally, the method further comprises the following step: (3) performing acid treatment on the platinum-tellurium-bismuth catalyst obtained in step (2) to dealloy, thereby obtaining a bismuth-doped platinum-tellurium catalyst. The catalyst exhibits excellent electrocatalytic activity and stability in a formic acid oxidation reaction.

This invention discloses a palladium-based alloy catalyst, its preparation method, and its application in formic acid fuel cells, belonging to the field of palladium catalyst electrocatalysis technology. The catalyst prepared by this invention is a ruthenium-doped two-dimensional palladium-based alloy catalyst, which has an ordered mesoporous two-dimensional nanosheet structure. In the preparation process, dodecyltriruthenium is selected as the ruthenium source. Under heating conditions, it decomposes to form CO, which acts as a structure directing agent, inducing the formation of two-dimensional nanosheets and effectively inhibiting the aggregation of metal atoms. During this process, the interaction between palladium and ruthenium metal atoms leads to the formation of ordered mesopores in the catalyst. The surface morphology of the catalyst can be flexibly controlled by controlling the amount of ruthenium metal atoms incorporated. The obtained catalyst exhibits excellent formic acid oxidation performance.

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 .