期刊
APPLIED SURFACE SCIENCE
卷 548, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2021.149027
关键词
Watse tire recycling; Sulfonation; Carbonization; N-doping; ORR catalyst
类别
资金
- Korea Institute of Science and Technology (KIST) Institutional program [10083586]
- Carbon Cluster Development Program [10083586]
- Civil-Military Technology Cooperation Program - Ministry of Trade, Industry and Energy, Republic of Korea
This study proposes a method to recycle rubbers and carbon black together from waste tires, by carbonizing rubbers in the tires with the assistance of sulfonation. The N-doped catalyst with carbonized rubbers and carbon black showed superior ORR activity, comparable to a Pt/C catalyst. The results indicate that the proposed approach is an effective solution for dealing with waste tires.
Currently, there are 1.5 billion waste tires (WTs) produced yearly, which has become a vital issue worldwide. In this study, we suggest to recycle rubbers and carbon black (CB) together by carbonizing rubbers in WTs. Sulfonation of WT rendered stable structure to carbonize rubbers, which are innately non-carbonizable. The following heat-treatment in Ar/NH3 atmosphere provided abundant nitrogen functional groups on resulting carbons including CB and carbonized rubbers, confirmed by X-ray photoelectric (XPS) spectroscopy and TEM micrographs. To validate them as oxygen reduction reaction (ORR) catalysts, a half-cell test in alkaline media was carried out. The N-doped catalyst with carbonized rubbers and CB exhibited a superior ORR activity to that with carbonized WTs without sulfonation and further those performance was comparable to a Pt/C catalyst. It is evident that carbonized rubbers induced higher nitrogen contents and larger electrochemical surface areas of the catalyst, which offered more active sites higher ORR activity. Therefore, we believed that the proposed approach introduced in this paper shows an effective solution to deal with WTs by envisioning alternative recycling pathway.
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