Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 11, Pages 12783-12792Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b21927
Keywords
FeP/Fe3O4; hollow hybrid nanoparticles; CNTs; electrocatalyst; Tafel slope
Funding
- National Science Fund for Distinguished Young Scholars [51825103]
- Natural Science Foundation of China [51771188, 51571189]
- Major Program of Development Foundation of Hefei Center for Physical Science and Technology [2017FXZY002]
- Anhui Provincial Natural Science Foundation [1708085QE92]
- Open Project of State Key Laboratory of Environment-friendly Energy Materials [19kfhg08]
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We develop a method to prepare hollow FeP/Fe3O4 hybrid nanoparticles supported on carbon nanotubes (CNTs), which could be used as highly active and efficient electrocatalysts. The Fe@Fe3O4/CNT hybrids were first synthesized by annealing the CNTs adsorbed with Fe(NO3)(3), followed by controlled phosphorization treatment. They exhibit an outstanding catalytic activity for oxygen evolution reaction (OER) with a low overpotential of 229 mV at a current density of 10 mA cm(-2), a high turnover frequency value of 0.35 at an overpotential of 300 mV, and an ultralow Tafel slope of 27.6 mV dec(-1), which is much better than that of FeP/Fe3O4, FeP/CNTs, Fe3O4/CNTs, and the commercial RuO2 electrocatalyst. More importantly, the Tafel slope is much lower than most non-noble metal-based OER electrocatalysts reported in the previous literature studies as far as we know. The excellent OER performance benefits from the electron transfer from Fe3O4 to FeP confirmed by X-ray photoelectron spectroscopy, together with good conductivity of CNTs. This hybrid structure supported on conductive CNTs may offer an efficient method to design earth-abundant and low-cost electrocatalysts for OER in practical applications.
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