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Dissertação Mengfei Li (3.318Mb)

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TOWARDS NICKEL SINGLE ATOM CATALYST SUPPORTED BY CARBON PAPERS FOR UREA OXIDATION
Mengfei Li | Posted on: 2022
Abstract
In this work nickel nanoparticles supported by carbon paper (NiNP/CP) were prepared by pulsed laser deposition with deposition time of 10s, 30s and 60s in argon atmosphere. In addition, Ni single atoms based on carbon paper (NiSA/CP) with deposition time of 2s, 5s, 10s and 20s were prepared in vacuum. All the samples were tested as catalysts for urea oxidation. The surface and morphology of the nickel catalysts were characterized using scanning electron microscopy and transmission electron microscopy. The urea oxidation reaction of NiNP/CP in KOH solution was investigated by cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy. The results showed that the electrodes were catalytically active for urea oxidation, and the ones with less Ni nanoparticles had higher peak current densities. All samples had good stability. The same characterization method was applied to NiSA/CP and it was found that the longer the deposition time, the less ESA of the electrode, but the higher the peak current density, the faster the electron transfer rate, the higher the electrocatalytic activity and the better stability. The results obtained in this work indicate that pulsed laser deposition can be an alternative method for catalyst preparation by depositing metallic nanoparticles or single atoms. As such, they have great potential for practical application as catalysts for the electro-oxidation of urea in the treatment of urea-rich wastewater, and the hydrogen produced in this process can be used for clean power generation
[Texto sem Formatação]
Document type
Dissertação
Source
MENGFEI LI. Towards nickel single atom catalyst supported by carbon papers for urea oxidation. 2022. 82 f. Dissertação (Mestrado em Engenharia Química) - Universidade Federal Fluminense, Niterói, 2022.
Subject(s)
Urea oxidation
Nickel nanoparticles
Nickel single atom
Carbon paper
Catalyst
Engenharia química
Uréia
Catalisador
Nanopartícula
 
URI
http://app.uff.br/riuff/handle/1/25738
License Term
CC-BY-SA
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