Ti-doped hematite films coupled with ultrathin nickel-borate layer as photoanode for enhanced photoelectrochemical water oxidation

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作者
Changhai Liu
Tingting Zhang
Dengxiaojiang Zhao
Chao Zhang
Guofu Ou
Haozhe Jin
Zhidong Chen
机构
[1] Changzhou University,School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering
[2] Changzhou University,School of Petrochemical Engineering
[3] Changzhou University,Institute of Flow
[4] Zhejiang Sci-Tech University,Induced Corrosion and Intelligent Prevention
来源
Journal of Materials Science: Materials in Electronics | 2021年 / 32卷
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摘要
Hematite (α-Fe2O3) is a very attractive photoanode material for photoelectrochemical (PEC) water oxidation application due to its remarkable chemical stability and appropriate bandgap. However, the low charge separation efficiency, poor conductivity, and sluggish water oxidation kinetics still severely limit its expected performance. In this study, we constructed a photo-electrodeposited amorphous nickel-borate (Ni-Bi) thin layer on Ti-doped α-Fe2O3 photoanode. The fabricated heterostructure photoanode developed a built-in electric field, which will accelerate charge transport and improve the water oxidation kinetics significantly, resulting in the greatly enhanced photocurrent density of about 348% at 1.23 V vs. reversible hydrogen electrode (RHE) and the improvement of onset potential advance of ~ 80 mV. The surface morphology of samples was characterized with field-emission scanning electron microscope (FE-SEM) and high-resolution transmission electron microscope (HRTEM). The Mott–Schottky (M-S) and electrochemical impedance spectroscopy (EIS) results confirmed the donor density and the conductivity of photoanodes with Ti-doping and Ni-Bi coated. This work provides a novel strategy to develop various heterojunction photoanodes for practical PEC application of α-Fe2O3.
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页码:7061 / 7072
页数:11
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