Synthesis and characterization of Z-scheme α-Fe2O3 NTs/ruptured tubular g-C3N4 for enhanced photoelectrochemical water oxidation

Bakr, Ahmed Esmail A.; Rouby, Waleed M. A. El; Khan, Malik Dilshad; Farghali, Ahmed A.; Xulu, Bheki; Revaprasadu, Neerish

doi:10.1016/j.solener.2019.09.052

Cited by 62 publications

(23 citation statements)

References 75 publications

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“…S10,† the work functions of Cu 2 O and α-Fe 2 O 3 are 4.6 eV and 5.79 eV, respectively. 62 Hence, α-Fe 2 O 3 could be the oxidation photocatalyst (OP), with Cu 2 O as the reduction photocatalyst (RP), supporting our aforementioned assumption. When Cu 2 O contacts α-Fe 2 O 3 , electrons from Cu 2 O with a higher WF function would transfer to α-Fe 2 O 3 , with an internal electric field (IEF) constructed.…”

Section: Resultssupporting

confidence: 66%

An S-scheme α-Fe₂O₃/Cu₂O photocatalyst for an enhanced primary amine oxidative coupling reaction under visible light

Qiu

et al. 2022

Dalton Trans.

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Section: Resultssupporting

confidence: 66%

An S-scheme α-Fe₂O₃/Cu₂O photocatalyst for an enhanced primary amine oxidative coupling reaction under visible light

Qiu

et al. 2022

Dalton Trans.

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“…Electron spin resonance (ESR) measurement is conducted to elucidate whether the interfacial charge transfer in ZnIn 2 S 4 /CdS complies with the type II heterojunction or direct Z‐scheme pathway via determining the superoxide anion radicals (•O 2 − ) and hydroxyl radicals (•OH) signals. [ 32 ] Details can be found in the Experimental Section in Supporting Information. As shown in Figure 3c, the •OH is generated under visible‐light irradiation for ZnIn 2 S 4 /CdS, while no significant signal can be detected for pristine ZnIn 2 S 4 .…”

Section: Resultsmentioning

confidence: 99%

Interfacial Chemical Bond‐Modulated Z‐Scheme Charge Transfer for Efficient Photoelectrochemical Water Splitting

Tian

Meng

et al. 2021

Advanced Energy Materials

168

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The Z‐scheme heterojunction has great potential in photoelectrochemical (PEC) water splitting due to its unique charge‐carrier migration pathway, superior carrier separation efficiency, and high redox capacity, but how to regulate the Z‐scheme charge transfer at the nanometric interface of heterostructures still remains a big challenge. Herein, InOCd bond is rationally introduced at the interface between ZnIn2S4 nanosheets and CdS nanoparticles through a facile cation exchange reaction, which successfully converts the previously reported type II band structure to a direct Z‐scheme heterojunction (ZnIn2S4/CdS) as confirmed by various characterizations. Density functional theory calculation reveals that the InOCd interfacial chemical bond significantly uplifts the Fermi level of ZnIn2S4 and CdS, inverts the interfacial band bending direction, thus resulting in the formation of Z‐scheme heterojunction. Moreover, an amorphous ZnO overlayer is deposited to eliminate the surface defects and accelerate the surface reaction kinetics. Benefiting from the superior charge separation efficiency and high redox ability originating from the Z‐scheme structure, the optimum ZnIn2S4/CdS/ZnO photoanode exhibits a dramatically enhanced PEC performance with low onset potential (−0.03 V vs reversible hydrogen electrode, VRHE) and large photocurrent of 3.48 mA cm−2 at 1.23 VRHE, which is about 21.75 times that of pristine ZnIn2S4.

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“…Moreover, the C/Fe 2 O 3 composites had peaks at 27.5, 34.8, 35.6, 43.2, 56.2, 59.6, and 63.4°on the (104), ( 110), ( 202), (116), ( 122), (214), and (300) planes of Fe 2 O 3 , respectively (Figure S2). 31,32 Nearly all of the characteristic peaks of both g-C 3 N 4 and C/Fe 2 O 3 were also observed in the g-C 3 N 4 /C/Fe 2 O 3 photocatalysts, demonstrating that C/Fe 2 O 3 was inserted into the g-C 3 N 4 nanosheets.…”

Section: Introductionmentioning

confidence: 96%

Novel g-C₃N₄/C/Fe₂O₃ Composite for Efficient Photocatalytic Reduction of Aqueous Cr(VI) under Light Irradiation

Zhao

Guo

Tang

et al. 2021

Ind. Eng. Chem. Res.

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Research on the rational design of photocatalysts for efficient hexavalent chromium (Cr(VI)) reduction from Cr(VI)containing wastewater has attracted widespread attention. In this paper, a novel g-C 3 N 4 /C/Fe 2 O 3 photocatalyst was successfully synthesized by anchoring g-C 3 N 4 nanosheets onto C/Fe 2 O 3 that was prepared using collagen fiber as the biochar resource following the Fe tanning mechanism to reduce Cr(VI) under artificial solar irradiation. Under the same conditions, the as-prepared g-C 3 N 4 /C/ Fe 2 O 3 photocatalyst exhibited higher Cr(VI) reduction efficiency than g-C 3 N 4 , and the Cr(VI) reduction efficiency increased as Fe content in the g-C 3 N 4 /C/Fe 2 O 3 photocatalyst increased. The enhanced photocatalytic performance was primarily ascribed to the formation of an indirect Z-scheme heterojunction between C/Fe 2 O 3 and g-C 3 N 4 , which improved the separation efficiency of the photogenerated charge carrier. Furthermore, radical trapping indicated that photoinduced electrons (e − ) were the main factor for Cr(VI) reduction. This work provides guidance for high value-added utilization of collagen fiber in constructing efficient light-driven photocatalysts and practical Cr(VI) removal from wastewater.

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Synthesis and characterization of Z-scheme α-Fe2O3 NTs/ruptured tubular g-C3N4 for enhanced photoelectrochemical water oxidation

Cited by 62 publications

References 75 publications

An S-scheme α-Fe₂O₃/Cu₂O photocatalyst for an enhanced primary amine oxidative coupling reaction under visible light

An S-scheme α-Fe₂O₃/Cu₂O photocatalyst for an enhanced primary amine oxidative coupling reaction under visible light

Interfacial Chemical Bond‐Modulated Z‐Scheme Charge Transfer for Efficient Photoelectrochemical Water Splitting

Novel g-C₃N₄/C/Fe₂O₃ Composite for Efficient Photocatalytic Reduction of Aqueous Cr(VI) under Light Irradiation

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Synthesis and characterization of Z-scheme α-Fe2O3 NTs/ruptured tubular g-C3N4 for enhanced photoelectrochemical water oxidation

Cited by 62 publications

References 75 publications

An S-scheme α-Fe2O3/Cu2O photocatalyst for an enhanced primary amine oxidative coupling reaction under visible light

An S-scheme α-Fe2O3/Cu2O photocatalyst for an enhanced primary amine oxidative coupling reaction under visible light

Interfacial Chemical Bond‐Modulated Z‐Scheme Charge Transfer for Efficient Photoelectrochemical Water Splitting

Novel g-C3N4/C/Fe2O3 Composite for Efficient Photocatalytic Reduction of Aqueous Cr(VI) under Light Irradiation

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An S-scheme α-Fe₂O₃/Cu₂O photocatalyst for an enhanced primary amine oxidative coupling reaction under visible light

An S-scheme α-Fe₂O₃/Cu₂O photocatalyst for an enhanced primary amine oxidative coupling reaction under visible light

Novel g-C₃N₄/C/Fe₂O₃ Composite for Efficient Photocatalytic Reduction of Aqueous Cr(VI) under Light Irradiation