Effects of In Situ Co or Ni Doping on the Photoelectrochemical Performance of Hematite Nanorod Arrays
Abstract
:Featured Application
Abstract
1. Introduction
2. Materials and Methods
2.1. Materials Preparation
2.2. Materials Characterization
2.3. Photoelectrochemical Measurements
3. Results and Discussion
3.1. Effects on Crystalline Phase
3.2. Effects on Morphology
3.3. Effects on Ultraviolet (UV)–Visible Absorption
- Eg: energy gap in eV between a conduction band and a valence band
- λ: wavelength in nm
- α: absorption coefficient
- hν: the energy of a photon
- B: a constant
- n: a constant 0.5 for direct transition and 2.0 for indirect transition
- A: absorbance
- b: the thickness of light-absorbing substance
- c: the concentration of light-absorbing substance
3.4. Effects on Photoelectrochemical Performance
3.4.1. Current-voltage (I-V) Plots
3.4.2. Mott–Schottky Plots
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Samples | Photocurrent (mA/cm2) | Potential (V vs. RHE) | Reference No. |
---|---|---|---|
undoped | 0.00498 | 0.85 | 16 |
Cr-doped | 0.00903 | 0.85 | 16 |
undoped | 0.72 | 1.23 | 4 |
S-doped | 1.42 | 1.23 | 5 |
undoped | 0.58 | 1.23 | 5 |
Sn-doped | 1.54 | 1.23 | 6 |
Y-doped | 0.0022 | 0.442 | 30 |
P-doped | 3 | 1.23 | 44 |
Sn-doped | 1.86 | 1.23 | 39 |
undoped | 0.523 | 0 | 17 |
Undoped | 0.61 | 1.27 | Present work |
Ni-doped | 0.79 | 1.27 | Present work |
Co-doped | 1.28 | 1.27 | Present work |
Samples | Slope | Charge Carrier Density (m−3) | Flat-Band Potential Efb (V) |
---|---|---|---|
undoped | 6.04 × 103 | 1.65 × 1025 | −0.226 |
Co-doped | 2.66 × 103 | 3.74 × 1025 | −0.220 |
Ni-doped | 3.98 × 103 | 2.50 × 1025 | −0.218 |
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Cheng, F.; Li, X. Effects of In Situ Co or Ni Doping on the Photoelectrochemical Performance of Hematite Nanorod Arrays. Appl. Sci. 2020, 10, 3567. https://doi.org/10.3390/app10103567
Cheng F, Li X. Effects of In Situ Co or Ni Doping on the Photoelectrochemical Performance of Hematite Nanorod Arrays. Applied Sciences. 2020; 10(10):3567. https://doi.org/10.3390/app10103567
Chicago/Turabian StyleCheng, Feng, and Xiuwei Li. 2020. "Effects of In Situ Co or Ni Doping on the Photoelectrochemical Performance of Hematite Nanorod Arrays" Applied Sciences 10, no. 10: 3567. https://doi.org/10.3390/app10103567