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Increased Active Sites on Irregular Morphological ?-Fe2O3 Nanorods for Enhanced Photoelectrochemical Performance.

ABSTRACT: Uniform rectangular ?-Fe2O3 nanorods (R-Fe2O3) and irregular ?-Fe2O3 nanorods (D-Fe2O3) with a random size vertically aligned on fluorine-doped tin oxide were prepared with a facile one-step hydrothermal procedure. X-ray diffraction (XRD) measurements and Raman spectra confirm that the obtained samples are ?-Fe2O3, and XRD patterns show that D-Fe2O3 has two extra (012) and (104) planes of hematite in addition to the identical peaks to R-Fe2O3. The carrier density of the D-Fe2O3 sample is four times larger than that of R-Fe2O3. Finally, the D-Fe2O3 photoelectrode exhibited a better photoelectrochemical (PEC) performance under visible illumination than that of R-Fe2O3, achieving the photocurrent density of 0.15 mA cm-2 at 1.23 V versus reversible hydrogen electrode. In addition, incident photo-to-current conversion efficiency of D-Fe2O3 is nearly three times larger than that of R-Fe2O3. Hence, the improved PEC performance of D-Fe2O3 can be ascribed to higher carrier density resulting from the amount of oxygen vacancies and more activated exposed surface facets.

SUBMITTER: Sun J 

PROVIDER: S-EPMC7271369 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature

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Increased Active Sites on Irregular Morphological α-Fe<sub>2</sub>O<sub>3</sub> Nanorods for Enhanced Photoelectrochemical Performance.

Sun Jiawei J   Xia Weiwei W   Zheng Qian Q   Zeng Xianghua X   Liu Wei W   Liu Gang G   Wang Pengdi P  

ACS omega 20200518 21

Uniform rectangular α-Fe<sub>2</sub>O<sub>3</sub> nanorods (R-Fe<sub>2</sub>O<sub>3</sub>) and irregular α-Fe<sub>2</sub>O<sub>3</sub> nanorods (D-Fe<sub>2</sub>O<sub>3</sub>) with a random size vertically aligned on fluorine-doped tin oxide were prepared with a facile one-step hydrothermal procedure. X-ray diffraction (XRD) measurements and Raman spectra confirm that the obtained samples are α-Fe<sub>2</sub>O<sub>3</sub>, and XRD patterns show that D-Fe<sub>2</sub>O<sub>3</sub> has two extra (0  ...[more]

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