Deep surface reconstruction of Co-based cocatalyst on Ti-doped α-Fe2O3 photoanode for highly efficient water oxidation

Liu, Kailong; Zhang, Long; Jiang, Qi; Huang, Mengyan; Liu, Peng; Zuo, Shiyu; Ma, Peiyan; Fu, Zhengyi

doi:10.1016/j.ijhydene.2022.11.221

Cited by 8 publications

(8 citation statements)

References 61 publications

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“…The peaks located at 529.6, 531.1, and 532.4 eV are the characteristic peaks of the O 2– lattice (O β ), surface-adsorbed hydroxyl oxygen (OH – ), and adsorbed molecular water (O γ ), respectively. , Figure c shows the Ti 2p XPS spectra of Ti(0.25%):Fe 2 O 3 and Ti:Fe 2 O 3 /NiFe-LDH(0.04C). The Ti 2p 3/2 and Ti 2p 1/2 peaks appear at 458.2 and 464.1 eV, which demonstrates the presence of Ti 4+ ions . The binding energy of Ti 2p 3/2 (458.2 eV) was observed between the peaks for metallic Ti (454.2 eV) and TiO 2 (458.5 eV), indicating that Ti 4+ has been doped into the crystal lattice of hematite.…”

Section: Resultsmentioning

confidence: 95%

“…The Ti 2p 3/2 and Ti 2p 1/2 peaks appear at 458.2 and 464.1 eV, which demonstrates the presence of Ti 4+ ions. 39 The binding energy of Ti 2p 3/2 (458.2 eV) was observed between the peaks for metallic Ti (454.2 eV) and TiO 2 (458.5 eV), indicating that Ti 4+ has been doped into the crystal lattice of hematite. Figure 4d ) and E g (250, 295, 415, 605 cm −1 ) can be observed in Figure 5.…”

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confidence: 96%

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NiFe-LDH-Decorated Ti-Doped Hematite Photoanode for Enhancing Solar Water-Splitting Efficiency

Bai,

Jia,

Zhao

et al. 2023

Inorg. Chem.

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Ti-doped α-Fe2O3 nanorods were prepared by a facile hydrothermal method, followed by a NiFe-LDH catalyst that was electrodeposited on the doped α-Fe2O3 nanorods to structure an integrating photoanode Ti:Fe2O3/NiFe-LDH for improving solar PEC water-splitting efficiency. The structure and properties of electrode materials were characterized and the PEC properties of photoanodes were measured. The results show that the photocurrent density of the photoanode enhances 11.25 times at 1.23 V (vs RHE) and the IPCE value enhances 4.10 times at 420 nm compared with pristine α-Fe2O3. The enhancement is attributed to the separating of photogenerated electron–hole, the increase of carrier density, and the acceleration of the carrier transfer rate due to the dual action of doping and catalysis.

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Section: Resultsmentioning

confidence: 95%

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confidence: 96%

NiFe-LDH-Decorated Ti-Doped Hematite Photoanode for Enhancing Solar Water-Splitting Efficiency

Bai,

Jia,

Zhao

et al. 2023

Inorg. Chem.

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“…Figure S12 (Supporting Information) shows Co 2p XPS spectra of TFC and TFIC, which exhibited two spin–orbit doublets at around 780.5 and 795.8 eV, with satellite peaks at 786.8 and 803 eV, corresponding to the characteristics of Co 2p 1/2 and Co 2p 3/2 , respectively. No additional shakeup peaks can be observed, indicating that the surface Co species mainly exist in the form of Co(III) ions rather than the Co(II) oxidation state, which can ameliorate the low kinetics during the PEC water splitting process.…”

Section: Resultsmentioning

confidence: 99%

“…where J Na 2 SO 3 and J H 2 O are the photocurrent densities measured with and without 0.5 M Na 2 SO 3 , respectively. J abs is the theoretical maximum photocurrent density of the photoelectrode material …”

Section: Methodsmentioning

confidence: 99%

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Boosted Photoelectrochemical Seawater Splitting by CoOOH-Modified Ti-Fe₂O₃/In₂O₃ by Synergy of Electronic Modulation and Heterojunction Construction

Wang,

et al. 2023

ACS Appl. Nano Mater.

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In order to address the current energy and environmental challenges, photoelectrochemical (PEC) water splitting has been widely studied, and the key point about the efficient PEC process is how to develop highly active photoanode catalysts. In this article, we report a two-step hydrothermal and electrodeposition approach to prepare a cobalt (oxy)hydroxide (CoOOH)-modified Ti-Fe 2 O 3 -In 2 O 3 electrode by synergy of electron modulation and a heterojunction structure for promoting PEC water splitting. Under a bias of 1.23 V vs RHE, the optimized Ti-Fe 2 O 3 -In 2 O 3 /CoOOH photoanode demonstrated remarkable photocurrent density and hydrogen evolution rate as high as 1.33 mA cm −2 and 22.8 μmol cm −2 h −1 , which was 5.11-fold and 5.14fold that of bare α-Fe 2 O 3 , respectively. Characterization results indicate that Ti-doping will alter the electronic structure and improve the charge carrier density, whereas the construction of a heterojunction can realize the spatial separation of charge carriers. Meanwhile, the outer CoOOH ultrathin layer can provide a large amount of oxygen evolution reaction sites and promote the surface reaction. This work suggests that the PEC performance of Fe 2 O 3based photoanodes can be improved effectively by the synergy of electronic modulation and heterojunction construction.

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Fabrication of Hematite Photoanode Consisting of (110)‐Oriented Single Crystals

Zhang,

He,

Bao

et al. 2023

ChemSusChem

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In this work, α‐Fe2O3 photoanode consisted of (110)‐oriented α‐Fe2O3 single crystals were synthesized by a facile hydrothermal method. By using particular additive (C4MimBF4) and regulation of hydrothermal reaction time, the Fe‐25 consisted of a single‐layer of highly crystalline (110)‐oriented crystals with fewer grain boundaries, which was vertically grown on the substrate. As a result, the charge separation efficiency and photoelectrochemical (PEC) performance of Fe‐25A (Fe‐25 after dehydration treatment) have been greatly improved. Fe‐25A yields a photocurrent of 1.34 mA cm−2 (1.23 V vs RHE) and an incident photon‐to‐current conversion efficiency (IPCE) of 31.95 % (380 nm). With the assistance of cobalt–phosphate water oxidation catalyst (Co−Pi), the PEC performance could be further improved by enhancing the holes transfer at electrode/electrolyte interface and inhibiting surface recombination. Fe‐25A/Co−Pi yields a photocurrent of 2.67 mA cm−2 (1.23 V vs RHE) and IPCE value of 50.8 % (380 nm), which is 3.67 times and 2.39 times as that of Fe‐2A/Co−Pi. Our work provides a simple method to fabricate highly efficient Fe2O3 photoanodes consist of characteristic (110)‐oriented single crystals with high crystallinity and high quality interface contact to enhance charge separation efficiencies.

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Deep surface reconstruction of Co-based cocatalyst on Ti-doped α-Fe2O3 photoanode for highly efficient water oxidation

Cited by 8 publications

References 61 publications

NiFe-LDH-Decorated Ti-Doped Hematite Photoanode for Enhancing Solar Water-Splitting Efficiency

NiFe-LDH-Decorated Ti-Doped Hematite Photoanode for Enhancing Solar Water-Splitting Efficiency

Boosted Photoelectrochemical Seawater Splitting by CoOOH-Modified Ti-Fe₂O₃/In₂O₃ by Synergy of Electronic Modulation and Heterojunction Construction

Fabrication of Hematite Photoanode Consisting of (110)‐Oriented Single Crystals

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Deep surface reconstruction of Co-based cocatalyst on Ti-doped α-Fe2O3 photoanode for highly efficient water oxidation

Cited by 8 publications

References 61 publications

NiFe-LDH-Decorated Ti-Doped Hematite Photoanode for Enhancing Solar Water-Splitting Efficiency

NiFe-LDH-Decorated Ti-Doped Hematite Photoanode for Enhancing Solar Water-Splitting Efficiency

Boosted Photoelectrochemical Seawater Splitting by CoOOH-Modified Ti-Fe2O3/In2O3 by Synergy of Electronic Modulation and Heterojunction Construction

Fabrication of Hematite Photoanode Consisting of (110)‐Oriented Single Crystals

Contact Info

Product

Resources

About

Boosted Photoelectrochemical Seawater Splitting by CoOOH-Modified Ti-Fe₂O₃/In₂O₃ by Synergy of Electronic Modulation and Heterojunction Construction