期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 9, 页码 3926-3932出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta11140a
关键词
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资金
- National Science Fund for Distinguished Young Scholars [21625601]
- Major Project of NSF of China [91334203]
- Outstanding Talent Fund from BUCT
Non-precious metal and nitrogen codoped carbon catalysts have emerged as promising candidates to replace noble platinum (Pt)-based catalysts in the processes of the oxygen reduction reaction (ORR) and the hydrogen evolution reaction (HER). Herein, we use a 1D/2D hybrid strategy to synthesize a Co, Ncodoped carbon nanotube (CNT)/graphene heterostructure bifunctional catalyst (Co/NCNT/NG). The Co/NCNT/NG heterostructure catalyst shows not only a positive half-wave potential of 0.85 V (versus RHE) and long-term stability for the ORR, but also a low overpotential of 123 mV at a current density of 10 mA cm(-2) and ultrahigh stability in 0.5 M H2SO4 for the HER. The superior performance of the Co/NCNT/NG catalyst is attributed to the inimitable 1D/2D CNT/graphene heterostructure, in which 1D and 2D structures provide different catalytically active sites (including metallic Co, CoN2 and N-C) for the HER and ORR, respectively. Moreover, the catalyst also exhibits similar discharge performance and robust durability as an air electrode in Zn-air batteries to the Pt-based one. This work provides a new approach for the in situ synthesis of bifunctional and multifunctional catalysts by integrating 1D/2D/3D materials with different catalytically active sites into one heterostructure.
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