02094nam a2200265Ia 4500003001000000005001700010040000900027245014200036490005700178520120500235650003001440650002001470650002601490650001201516650001901528700001101547700001201558700001201570700001201582700001101594700001401605700001201619856015601631008004101787MX-MdCICY20260521091701.0  cCICY10aBiomass coffee grounds derived nitrogen-doped ultrafine carbon nanoparticles as an efficient electrocatalyst to oxygen reduction reaction0 vJournal of Alloys and Compounds, 920, p.165895, 20223 aA nitrogen-doped carbon-based catalyst (Fe-C-CG)to oxygen reduction reaction (ORR)is synthesized by pyrolyzing a precursor from coffee grounds, iron chloride and commercial carbon black in ammonia atmosphere. The coffee grounds are pyrolyzed to carbon particles with diameters about 20 nm with the facilitation of carbon black. The carbon nanoparticles show higher reactive activity with ammonia to achieve the doping of nitrogen atoms to carbon with 3.33 at percent of content in Fe-C-CG, which is greater than 0.47 at percent in the product from commercial carbon black (Fe-C). Resultantly, the Fe-C-CG exhibits high ORR activity with 0.87 V of half wave potential and 5.48 mA cm?² of limited diffusion current, which highly surpass the 0.71 V, 4.19 mA cm?² for Fe-C, and are comparable with 0.86 V and 4.52 mA cm?² for Pt/C catalyst, respectively. The Zn-air battery assembled with Fe-C-CG delivers 142 mW cm?² of maximum power density and 774 mAh g?¹Zn of specific capacity, and can stably work at 1.212~1.257 V of discharge voltage at 10 mA cm?². This work provides a strategy to prepare a nonprecious metal and nitrogen doped carbon catalyst to ORR by using biomass as the basic material.14aOXYGEN REDUCTION REACTION14aELECTROCATALYST14aNITROGEN-DOPED CARBON14aBIOMASS14aCOFFEE GROUNDS12aLi, G.12aSha, J.12aSun, L.12aJin, R.12aFu, T.12aXiang, Y.12aGuo, C.40uhttps://drive.google.com/file/d/1ASYqp9lL9KU3v7EmE00OhFzngwpV_ktB/view?usp=drivesdkzPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx250602s9999    xx |||||s2   |||| ||und|d