Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 288, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2020.121421
Keywords
Metal-organic frameworks; Dual-doping; Bimetallic; Nanotube; Oxygen evolution reaction; Electrocatalysis
Funding
- Zhejiang Provincial Natural Science Foundation of China [LY20E020001]
- National Natural Science Foundation of China [51602301, 51672251]
- Fundamental Research Funds of Zhejiang Sci-Tech University [2019Q007]
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Metal-organic frameworks (MOFs) are attracting more and more attention in the field of electrocatalysis because of their porosity, ease of adjustment and functionalization. Herein, we report the preparation of sulfur-nitrogen dual-doped Co-Fe bimetallic carbon nanotubes (CoFe@SNCN) using MOFs as precursors. The optimized CoFe@SNCN achieves a current density of 10 mA cm(-2) at a low overpotential of 306.4 mV with a very small Tafel slope of 76.0 mV dec(-1) in 1 M KOH, which is 64 mV smaller than that of Co@SNCN (370.4 mV) and 48 mV smaller than that of Fe@SNCN (354.4 mV). Moreover, the catalytic performance remains almost unchanged after 12 h. The excellent electrocatalytic performance can be attributed to the synergies between the bimetals and heteroatoms doping, which can greatly improve the electrical conductivity between the metals, promote the transfer of electrons and the exchange of substances, thereby greatly reducing the reaction kinetics and enhancing OER properties. This work may provide a very good solution for the research of a new type of highly efficient stable electrocatalytic oxygen evolution catalyst.
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