| Title: |
Fe-doped CoS2 nanoparticles supported CoS2 microspheres@N-doped carbon electrocatalyst for enhanced oxygen evolution reaction. |
| Authors: |
Yang, Chen1 (AUTHOR), Chang, Yu-Xin1 (AUTHOR), Kang, Huiying1 (AUTHOR), Li, Yaru1 (AUTHOR), Yan, Mengmeng1 (AUTHOR), Xu, Sailong1 (AUTHOR) xusl@mail.buct.edu.cn |
| Source: |
Applied Physics A: Materials Science & Processing. Jun2021, Vol. 127 Issue 6, p1-9. 9p. |
| Subject Terms: |
*OXYGEN evolution reactions, *HYDROGEN evolution reactions, *METAL sulfides, *NANOPARTICLES, *TRANSITION metals, *CLEAN energy |
| Abstract: |
Non-noble electrocatalysts (such as transition metal sulfides) have been attractive to substitute noble-metal catalysts for oxygen evolution reaction (OER) to advance the practical application of clean energy. Herein, a Fe-doped CoS2 nanoparticles supported CoS2 microspheres@N-doped carbon (Fe-CoS2/CoS2@NC) is prepared as an efficient OER electrocatalyst. The Fe-CoS2/CoS2@NC composite is derived by sulfurizing the metanilic-intercalated Co(OH)2 microspheres decorated with binary active CoFe-Prussian blue analogue (CoFe-PBA) nanoparticles. The obtained composite combines the advantageous characteristics for enhancing electrocatalytic performances: binary active Fe-CoS2 derived from CoFe-PBA, active CoS2, N-doped carbon scaffold to improve electronic conductivity, the appropriate specific surface area and meso/macroporous size distribution to afford rich active sites. The Fe-CoS2/CoS2@NC requires an overpotential of 300 mV to reach a current density of 10 mA cm−2 with a Tafel slope of 72 mV dec−1 in 1.0 M KOH, outperforming those of NC/CoS2, NC/Fe-CoS2 and CoS2. Furthermore, the enhancement is experimentally supported by the low charge-transfer resistance and the large electrochemical active surface area during the OER. The synthesis approach could be extended to provide a tunable hydroxide/PBAs precursor-based approach for designing and preparing hierarchical structures as electrocatalysts. [ABSTRACT FROM AUTHOR] |
|
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