文摘
Hematite (伪-Fe2O3) is one of the most promising candidates for photoelectrodes in photoelectrochemical water splitting system. However, the low visible light absorption coefficient and short hole diffusion length of pure 伪-Fe2O3 limits the performance of 伪-Fe2O3 photoelectrodes in water splitting. Herein, to overcome these drawbacks, single-crystalline tin-doped indium oxide (ITO) nanowire core and 伪-Fe2O3 nanocrystal shell (ITO@伪-Fe2O3) electrodes were fabricated by covering the chemical vapor deposited ITO nanowire array with compact thin 伪-Fe2O3 nanocrystal film using chemical bath deposition (CBD) method. The J鈥?i>V curves and IPCE of ITO@伪-Fe2O3 core鈥搒hell nanowire array electrode showed nearly twice as high performance as those of the 伪-Fe2O3 on planar Pt-coated silicon wafers (Pt/Si) and on planar ITO substrates, which was considered to be attributed to more efficient hole collection and more loading of 伪-Fe2O3 nanocrystals in the core鈥搒hell structure than planar structure. Electrochemical impedance spectra (EIS) characterization demonstrated a low interface resistance between 伪-Fe2O3 and ITO nanowire arrays, which benefits from the well contact between the core and shell. The stability test indicated that the prepared ITO@伪-Fe2O3 core鈥搒hell nanowire array electrode was stable under AM1.5 illumination during the test period of 40鈥?00 s.