2499 results about "N dimethylformamide" patented technology

The invention discloses a method for preparing a proton-exchange membrane fuel cell oxygen reduction catalyst based on PtNi (111) octahedral single crystal nanoparticles, which mainly solves the problem in the prior art that a conventional single-Pt catalyst or a Pt-based catalyst based on bimetallic spherical core-shell-structured nanoparticles is low in activity and poor in Pt atomic efficiency. Meanwhile, the influence factor and the synthesis optimization condition for morphology-controlled PtNi (111) octahedral single crystal nanoparticles are obtained. According to the technical scheme of the invention, platinum acetylacetonate and nickel acetylacetonate are adopted as metal salt precursors, and N, N-dimethylformamide (DMF) is adopted as a crystal face growth control agent. Through the heating reduction process, morphology-controlled PtNi (111) octahedral single crystal nanoparticles are obtained. The morphology-controlled PtNi (111) octahedral single crystal nanoparticles are subjected to ultrasonic dispersion in n-hexane, and then the well dispersed sol is slowly added onto the conductive carbon black of high specific surface area drop by drop through the residual titration process. Therefore, the electro-catalysis specific activity of the obtained oxygen reduction catalyst is high up to 1.5 A / mg Pt, and is improved by 9-10 times compared with that of conventional commercial Pt / C catalysts.