Enhanced photoelectrochemical performance of an α-Fe2O3 nanorods photoanode with embedded nanocavities formed by helium ions implantation |
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| Affiliation: | 1. School of Physics and Technology, Center for Ion Beam Application, Hubei Key Laboratory of Nuclear Solid Physics, Wuhan University, Wuhan, 430072, China;2. International Research Center for Renewable Energy and State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Shanxi, 710049, China;1. School of Physical Science and Technology, Guangxi University, Nanning 530004, China;2. School of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China;1. International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Xi''an, 710049, China;2. Northwest Agriculture and Forestry University, Yangling, 712100, China |
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| Abstract: | Hematite is a prospective semiconductor in photoelectrochemical (PEC) water oxidation field due to its suitable bandgap for the solar spectrum absorption. Nevertheless, the low transfer and separation efficiency of the charge carriers are restricted by its diffusion length of hole which is 2–4 nm and further reduce the PEC performance. Here, we report an innovative method, by introducing nanocavities into the α-Fe2O3 nanorod arrays photoanodes through helium ions implantation, to improve the charge carriers' transfer and separation efficiency and further to enhance water oxidation performance. The result indicates that, the photocurrent density of nanocavities embedded α-Fe2O3 photoanode (S2-A sample) reaches 1.270 mA/cm2 at 1.6 V vs. RHE which is 1-fold higher than that of the pristine α-Fe2O3 (0.688 mA/cm2) and the photocurrent density of S2-A sample reaches 0.652 mA/cm2 at 1.23 V vs. RHE. In this work, the ion implantation combined with post annealing method is found to be a valid method to improve the photoelectrochemical performance, and it also can be further used to modify the other semiconductor photoelectrodes materials. |
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| Keywords: | Nanocavities PEC water splitting Ion implantation |
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