Heteroatom doped carbon nanosheets from waste tires as electrode materials for electrocatalytic oxygen reduction reaction : effect of synthesis techniques on properties and activity
| Autor: | Andrei Veksha, Wenqian Chen, Jun Eng Ng, Grzegorz Lisak, Naziah Mohamad Latiff |
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| Přispěvatelé: | School of Civil and Environmental Engineering, Nanyang Environment and Water Research Institute |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Waste tires Doped carbon Non-blocking I/O Heteroatom chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Environmental engineering [Engineering] Chemical engineering chemistry Heteroatom Doping Yield (chemistry) General Materials Science Carbon Nanosheets 0210 nano-technology Carbon Pyrolysis |
| Popis: | The effective method for synthesis of heteroatom doped carbon nanosheets (CNS) from waste tires was developed. The process employed NiO loaded CaCO₃ catalyst for catalytic chemical vapor deposition (CCVD) of the CNS from the non-condensable pyrolysis gas. The promotion of CaCO₃ with NiO had beneficial effect on carbon growth compared to pure CaCO₃, increasing the carbon yield by 2.8 and 8.0 times for the CCVD at 700 and 750 °C, respectively. On the contrary, the morphology and structure of synthesized S,O-doped CNS as well as oxygen reduction reaction (ORR) electrocatalytic activity were not influenced by the NiO addition. Based on the carbon yields and ORR electrocatalytic activities, the preferred CCVD temperature was 700–750 °C, resulting in the CNS with the ORR peak reduction potentials of −0.217 V to −0.220 V (versus −0.167 V for Pt electrode). The improvement of CCVD process was proposed decreasing the ORR peak reduction potential to −0.191 V. A mixture of NH₃ and H₂O was added to pyrolysis gas, promoting the development of mesoporosity and incorporation of N into the material structure. The developed technique is a viable solution for the conversion of non-condensable gases from tire pyrolysis into S,N,O-doped CNS for ORR. Economic Development Board (EDB) Nanyang Technological University The authors would like to acknowledge the Nanyang Environment and Water Research Institute, Nanyang Technological University (Singapore), and Economic Development Board (Singapore) for the financial support of this research. |
| Databáze: | OpenAIRE |
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