Preparation and Photoelectrochemical Water Oxidation of Hematite Nanobelts Containing Highly Ordered Oxygen Vacancies

doi:10.15541/jim20210175

Journal of Inorganic Materials ›› 2021, Vol. 36 ›› Issue (12): 1290-1296.DOI: 10.15541/jim20210175

Special Issue: 【虚拟专辑】氢能材料(2020~2021)

• RESEARCH ARTICLE • Previous Articles Next Articles

Preparation and Photoelectrochemical Water Oxidation of Hematite Nanobelts Containing Highly Ordered Oxygen Vacancies

ZHANG Wenjin¹^,²(), SHEN Qianqian¹^,²(), XUE Jinbo¹^,², LI Qi³, LIU Xuguang¹^,², JIA Husheng¹^,²

1. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
2. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
3. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China

Received:2021-03-18 Revised:2021-04-24 Published:2021-12-20 Online:2021-05-25
Contact: SHEN Qianqian, lecturer. E-mail: shenqianqian@tyut.edu.cn
About author:ZHANG Wenjin(1996-), male, Master candidate. E-mail: zhang_wenjin1@163.com
Supported by:
National Natural Science Foundation of China(62004137);National Natural Science Foundation of China(21878257);National Natural Science Foundation of China(21978196);Natural Science Foundation of Shanxi Province(201701D221083);Key Research and Development Program of Shanxi Province(201803D421079);Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(2019L0156);Shanxi Provincial Key Innovative Research Team in Science and Technology(201605D131045-10);Research Project Supported by Shanxi Scholarship Council of China(2020-050)

Abstract

Abstract:

Aiming at the performance-limiting characteristics of short hole diffusion length (2-4 nm) and sluggish water oxidation kinetics in hematite (α-Fe₂O₃), we developed hematite nanobelts containing ordered oxygen vacancies by catalyzed oxidation of palladium nanocrystals for efficient photoelectrochemical (PEC) water splitting. Morphologies and structures of as-prepared films were characterized by different methods. Results show that ordered oxygen vacancies was observed in hematite nanobelts with a periodicity of 1.48 nm corresponding to ten times of (11¯2) interplanar spacing. The PEC performance of the hematite nanobelts exhibits stable photocurrent density of 3.3 mA·cm^-2, the corresponding hydrogen evolution rate of 29.46 μmol·cm^-2·h^-1, and an early onset potential of 0.587 V (vs. RHE) without additional oxygen evolution reaction cocatalysts. The enhanced performance can be attributed to the introduced ordered oxygen vacancies which can increase the carrier density, greatly accelerate the surface holes transfer, and act as surface active sites to significantly promote the surface water oxidation reaction.

Key words: α-Fe₂O₃, ordered oxygen vacancies, photoelectrochemical, water oxidation

CLC Number:

TQ174

ZHANG Wenjin, SHEN Qianqian, XUE Jinbo, LI Qi, LIU Xuguang, JIA Husheng. Preparation and Photoelectrochemical Water Oxidation of Hematite Nanobelts Containing Highly Ordered Oxygen Vacancies[J]. Journal of Inorganic Materials, 2021, 36(12): 1290-1296.

Figures/Tables 8

Fig. 1 (a) TEM images and (b) corresponding histogram of particle size distribution of Pd nanocrystals

Fig. 2 Surface SEM images of (a) Fe3O4 NFs, (b) α-Fe2O3 NBs and (c) α-Fe2O3 NFs, (d, f)cross-sectional SEM images and (e, g) EDS mapping images of (d, e) α-Fe2O3 NBs, (f, g) α-Fe2O3 NFs; (h) XRD patterns of 3 photoanodes

Fig. 3 (a) Bright field TEM image, (b) typical HRTEM image from rectangular region in (a) and (c) corresponding fast Fourier transform (FFT) pattern, (d) enlarged HRTEM image, (e) crystal plane spacing measurement of α-Fe2O3 NBs

Fig. 4 (a, c) TEM images and (b, d) corresponding SAED patterns of (a, b) Fe3O4 NFs and (c, d) α-Fe2O3 NFs

Fig. 5 (a) XPS survey spectrum and high-resolution (b) Fe2p, (c) O1s, (d) Pd3d spectra of Fe3O4 NFs, α-Fe2O3 NBs and α-Fe2O3 NFs

Fig. 6 (a) LSV curves, (b) first-order derivatives of the photocurrent densities with respect to potential, (c) I-t curves at 1.23 V (vs. RHE), (d) stability test at 1.6 V (vs. RHE), (e) PEC hydrogen production diagram and (f) the hydrogen evolution rate diagram of Fe3O4 NFs, α-Fe2O3 NBs and α-Fe2O3 NFs The orange dashed line in (b) highlights the onset potential at a slope of 0.2 mA·cm-2·V-1

Fig. 7 (a) Surface photovoltage diagram, (b) electrochemical impedance spectra, (c) Mott-Schottky plots, and (d) Tafel plots of Fe3O4 NFs, α-Fe2O3 NBs and α-Fe2O3 NFs

Fig. 8 Schematic of α-Fe2O3 NBs containing highly ordered oxygen vacancies for efficient photoelectronchemical water splitting

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Preparation and Photoelectrochemical Water Oxidation of Hematite Nanobelts Containing Highly Ordered Oxygen Vacancies

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