Interfacial engineering of Ti3C2 MXene/CdIn2S4 Schottky heterojunctions for boosting visible-light H2 evolution and Cr(VI) reduction

Liu, Chao; Xiao, Wen; Yu, Guiyun; Wang, Qiang; Hu, Jiawei; Xu, Chang; Du, Xinyi; Xu, Jianguang; Zhang, Qinfang; Zou, Zhigang

doi:10.1016/j.jcis.2023.02.137

Cited by 45 publications

(6 citation statements)

References 76 publications

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“…Moreover, the high‐resolution Zn 2 p , In 3 d , and S 2 p spectra of ZIS confirm the existence of Zn 2+ , In 3+ , and S 2− valence states, respectively (Figure S6, Supporting Information). [ 33–35 ] Additionally, the corresponding Zn 2 p , In 3 d , and S 2 p peaks clearly shift to higher binding energies, implying the strong interaction between different components. Figure 1E shows two strong symmetrical characteristic peaks at 405.2 and 411.9 eV, corresponding to spin‐orbit splitting of Cd 2+ 3 d 3/2 and Cd 2+ 3 d 5/2 .…”

Section: Resultsmentioning

confidence: 99%

Multiobjective‐Optimization MoS₂/Cd‐ZnIn₂S₄/CdS Composites Prepared by In Situ Structure‐Tailored Technique for High‐Efficiency Hydrogen Generation

Zhao,

Yan,

et al. 2024

Small Structures

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Photocatalytic water splitting into hydrogen production provides a new avenue to produce clean chemical fuels. However, developing high‐efficiency photocatalytic materials still remains a challenge till now. Herein, multiobjective‐optimization MoS2/Cd‐ZnIn2S4/CdS (MS/CZIS/CS) composites are successfully constructed by an in situ structure‐tailored technique. Benefiting from the synergistic feature integrating sulfur vacancy, II‐type CZIS/CS heterojunction and Schottky‐type MS/CS heterojunction, such composites not only effectively steer photogenerated carrier transfer but also markedly expedite surface reaction kinetics for hydrogen reduction reaction. As a result, an optimal hydrogen evolution rate of 11.49 mmol g−1 h−1 is achieved over the MS/CZIS/CS catalysts, which is approximately 4.79 times higher than that of pristine ZIS (2.40 mmol g−1 h−1). This work provides some new inspirations for the steering of carrier transfer and the design of multiobjective‐optimization photocatalysts with high efficiency.

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Section: Resultsmentioning

confidence: 99%

Multiobjective‐Optimization MoS₂/Cd‐ZnIn₂S₄/CdS Composites Prepared by In Situ Structure‐Tailored Technique for High‐Efficiency Hydrogen Generation

Zhao,

Yan,

et al. 2024

Small Structures

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“…Under basic conditions CrO 4 2 − + 4 normalH 2 normalO + 3 normale − → Cr false( OH false) 3 + 5 OH − The increase in pH results in a decrease in the removal of Cr(VI). Moreover, at a pH value above 5, the deposition of Cr(OH) 3 produced during the photoreduction of Cr(VI) accumulates on the surface of the photocatalyst and thereby decreases the availability of the surface active sites of the photocatalyst for adsorption and restricts the degradation process. − …”

Section: Resultsmentioning

confidence: 99%

Efficient Photocatalytic Reduction of Hexavalent Chromium by BiVO₄-Decorated MXene Photocatalysts and Their Charge Carrier Dynamics

Razafintsalama,

Mishra,

Sahoo

et al. 2023

Langmuir

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The synergistically MXene (Ti 3 C 2 T x ) co-catalystdecorated BiVO 4 -based heterostructured photocatalysts have been synthesized by a hydrothermal approach with varied loading concentrations of MXene (Ti 3 C 2 T x ) to drive the hexavalent chromium reduction efficiently. The formation of the heterostructured photocatalyst was confirmed by the appearance of X-ray diffraction (XRD) peaks corresponding to the monoclinic BiVO 4 phase and MXene (Ti 3 C 2 T x ) and also the antisymmetric (834 cm −1 ) and symmetric stretching (715 cm −1 ) of tetrahedral VO 4 and D (1330 cm −1 ) and G (1570 cm −1 ) bands corresponding to MXene (Ti 3 C 2 T x ) in the Raman spectrum. The worm-like structures of BiVO 4 nanocrystals grew onto the lamellar sheets of MXene (Ti 3 C 2 T x ), as shown by field emission scanning electron microscopy (FESEM), and has an increased surface area of 15.62 m 2 g -1 in the case of BVO-20-TC. X-ray photoelectron spectroscopy (XPS) analysis confirms the presence of V 5+ and Ti 3+ states, and the uniform distribution of BiVO 4 nanocrystals over lamellar sheets of MXene (Ti 3 C 2 T x ) is evident from energy-dispersive X-ray (EDX) analysis. The ultraviolet-diffuse reflectance spectroscopy (UV-DRS) spectra suggest a decrease in the band gap energy of BVO-20-TC to 2.335 eV, promoting a higher degree of visible light harvesting. Upon optimization, by varying the pH, the amount of the photocatalyst, and the concentration of Cr(IV), BVO-20-TC exhibits the highest photocatalytic efficiency (96.39%) while using a Cr(VI) concentration of 10 ppm at pH 2 and 15 mg of the photocatalyst, and the photoreduction of Cr(VI) to Cr(III) follows the pseudo-first-order reaction. The decrease in the PL intensity in BVO-20-TC reveals a faster transfer of electrons from MXene (Ti 3 C 2 T x ) to BiVO 4 . Further, the higher degree of band bending at the BiVO 4 /MXene (Ti 3 C 2 T x ) heterojunction, revealed from the Mott−Schottky analysis, facilitates efficient charge transfer and eventually faster and efficient photoreduction of Cr(VI) to Cr(III). The reusability and stability test undertaken for BVO-20-TC reveals that even after five cycles, the Cr (VI) photoreduction efficacy is retained. This work provides insights into photoreduction of Cr (VI) by using such heterostructures.

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“…As a catalyst, MXenes remain unaltered during the reaction, providing surfaces for reactant adsorption and bringing them into proximity to enhance reaction possibility [62]. The final products of photocatalysis depend on the specific reactants, such as the reduction of Cr(VI) leading to Cr(III) species [63]. In addition, the surface properties, including defects and functional groups, are crucial for determining active sites, emphasizing the importance of understanding MXene surface chemistry to optimize the photocatalytic activity [64].…”

Section: Proposed Photocatalytic Mechanismmentioning

confidence: 99%

Ti3C2-MXene/NiO Nanocomposites-Decorated CsPbI3 Perovskite Active Materials under UV-Light Irradiation for the Enhancement of Crystal-Violet Dye Photodegradation

Alothman,

Khan,

Albaqami

et al. 2023

Nanomaterials

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Ti3C2-MXene material, known for its strong electronic conductivity and optical properties, has emerged as a promising alternative to noble metals as a cocatalyst for the development of efficient photocatalysts used in environmental cleanup. In this study, we investigated the photodegradation of crystal-violet (CV) dye when exposed to UV light using a newly developed photocatalyst known as Ti3C2-MXene/NiO nanocomposite-decorated CsPbI3 perovskite, which was synthesized through a hydrothermal method. Our research investigation into the structural, morphological, and optical characteristics of the Ti3C2-MXene/NiO/CsPbI3 composite using techniques such as FTIR, XRD, TEM, SEM–EDS mapping, XPS, UV–Vis, and PL spectroscopy. The photocatalytic efficacy of the Ti3C2-MXene/NiO/CsPbI3 composite was assessed by evaluating its ability to degrade CV dye in an aqueous solution under UV-light irradiation. Remarkably, the Ti3C2-MXene/NiO/CsPbI3 composite displayed a significant improvement in both the degradation rate and stability of CV dye when compared to the Ti3C2-MXene/NiO nanocomposite and CsPbI3 perovskite materials. Furthermore, the UV–visible absorption spectrum of the Ti3C2-MXene/NiO/CsPbI3 composite demonstrated a reduced band gap of 2.41 eV, which is lower than that of Ti3C2-MXene/NiO (3.10 eV) and Ti3C2-MXene (1.60 eV). In practical terms, the Ti3C2-MXene/NiO/CsPbI3 composite achieved an impressive 92.8% degradation of CV dye within 90 min of UV light exposure. We also confirmed the significant role of photogenerated holes and radicals in the CV dye removal process through radical scavenger trapping experiments. Based on our findings, we proposed a plausible photocatalytic mechanism for the Ti3C2-MXene/NiO/CsPbI3 composite. This research may open up new avenues for the development of cost-effective and high-performance MXene-based perovskite photocatalysts, utilizing abundant and sustainable materials for environmental remediation.

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Interfacial engineering of Ti3C2 MXene/CdIn2S4 Schottky heterojunctions for boosting visible-light H2 evolution and Cr(VI) reduction

Cited by 45 publications

References 76 publications

Multiobjective‐Optimization MoS₂/Cd‐ZnIn₂S₄/CdS Composites Prepared by In Situ Structure‐Tailored Technique for High‐Efficiency Hydrogen Generation

Multiobjective‐Optimization MoS₂/Cd‐ZnIn₂S₄/CdS Composites Prepared by In Situ Structure‐Tailored Technique for High‐Efficiency Hydrogen Generation

Efficient Photocatalytic Reduction of Hexavalent Chromium by BiVO₄-Decorated MXene Photocatalysts and Their Charge Carrier Dynamics

Ti3C2-MXene/NiO Nanocomposites-Decorated CsPbI3 Perovskite Active Materials under UV-Light Irradiation for the Enhancement of Crystal-Violet Dye Photodegradation

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Interfacial engineering of Ti3C2 MXene/CdIn2S4 Schottky heterojunctions for boosting visible-light H2 evolution and Cr(VI) reduction

Cited by 45 publications

References 76 publications

Multiobjective‐Optimization MoS2/Cd‐ZnIn2S4/CdS Composites Prepared by In Situ Structure‐Tailored Technique for High‐Efficiency Hydrogen Generation

Multiobjective‐Optimization MoS2/Cd‐ZnIn2S4/CdS Composites Prepared by In Situ Structure‐Tailored Technique for High‐Efficiency Hydrogen Generation

Efficient Photocatalytic Reduction of Hexavalent Chromium by BiVO4-Decorated MXene Photocatalysts and Their Charge Carrier Dynamics

Ti3C2-MXene/NiO Nanocomposites-Decorated CsPbI3 Perovskite Active Materials under UV-Light Irradiation for the Enhancement of Crystal-Violet Dye Photodegradation

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Multiobjective‐Optimization MoS₂/Cd‐ZnIn₂S₄/CdS Composites Prepared by In Situ Structure‐Tailored Technique for High‐Efficiency Hydrogen Generation

Multiobjective‐Optimization MoS₂/Cd‐ZnIn₂S₄/CdS Composites Prepared by In Situ Structure‐Tailored Technique for High‐Efficiency Hydrogen Generation

Efficient Photocatalytic Reduction of Hexavalent Chromium by BiVO₄-Decorated MXene Photocatalysts and Their Charge Carrier Dynamics