Recycling of waste tires by synthesizing N-doped carbon-based catalysts for oxygen reduction reaction

Upcycling waste tires to affordable catalysts for the oxygen reduction reaction

“…In our previous work, we recycled WTs for preparing ORR catalysts by acid stabilization using sulfuric acid, and similar samples were also fabricated using the pyrolysis method in an Ar/NH 3 atmosphere (N-CSWT). 33 As shown in Figure 3A, N-CHWT showed the onset potential of $0.902 V and the half-wave potential of $0.796 V, which are comparable activities for those of a commercial Pt/C catalyst (the onset potential of $0.922 V and the half-wave potential of $0.797 V). The LSV curves of two WT-derived catalysts and a commercial Pt/C catalyst indicate that N- CHWT has better activity than N-CSWT, and its activity is even comparable to that of a Pt/C catalyst.…”

“…It is known that ammonia gas provides nitrogen functional groups to N-CHWT that could play a role to enhance ORR. 32,33 Hence, an Ar/NH 3 flowed in the furnace during the heat treatment. Furthermore, WTs and HWTs were carbonized in Ar or Ar/NH 3 atmospheres (denoted as CWT, N-CWT, and CHWT) for use as control samples.…”

“…Our previous study showed that approximately 3 wt% Fe was removed from WTs after sulfuric acid stabilization. 33 However, N-CHWT still contained $0.33 wt% Fe, which could be sufficient to act as active sites for the ORR. HAADF-STEM and EDX mapping were carried out to identify the metal active sites (Figure 4A-F).…”

Upcycling Plastic Waste into High Value‐Added Carbonaceous Materials

“…[101] Therefore, mankind has steadily attempted to resolve this environmental issue. Carbon capture and storage (CCS), [76,78,[102][103][104] decarbonization using H 2 fuel, [86,[104][105][106] and the development of good catalysts [106] have been used to resolve environmental issues. In this regard, we describe the applications of waste-plastic-derived carbon materials to address the aforementioned environmental issues.…”

Utilização de EPS reciclado e elastômeros de pneus inservíveis para a obtenção de polímeros tenacificados

“…A preocupação com o destino destes pneus motiva estudos com alternativas para seu reaproveitamento. Kang et al (2021) utilizaram resíduos de pneus para sintetizar catalisadores dopados com nitrogênio para reação redução de oxigênio. A sulfonação em ácido sulfúrico com o tratamento térmico em atmosfera inerte de NH3 promoveu grupos funcionais de nitrogênio nos carbonos.…”