EDTA-assisted synthesis of amorphous BiSx nanodots for improving photocatalytic hydrogen-evolution rate of TiO2
TL;DR: In this article, the amorphous BiSx nanodots with the size of 0.5-2.nm were successfully and homogeneously loaded on TiO2 surface to extremely facilitate the photocatalytic H2-production performance.
About: This article is published in Journal of Alloys and Compounds.The article was published on 2021-12-20. It has received 19 citations till now. The article focuses on the topics: Amorphous solid & Nanodot.
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TL;DR: In this paper , the state-of-the-art strategies for enhancing H2 generation efficiencies over the pristine, heterostructured and co-catalayzed metal-sulfide photocatalysts were explored.
Abstract: Metal-sulfide nanostructures have piqued the interest of researchers for decades due to their intriguing optoelectronic properties. Indeed, significant advances and improvements have been made in various fundamental aspects for cutting-edge applications, such as water splitting and hydrogen production. Furthermore, rising demand for low-dimensional materials due to lower material consumption and improved performance due to quantum size effects has spurred research on semiconducting metal sulfides. Consequently, size-controllable nanostructures with diverse morphologies have been fabricated and studied for potential applications. However, the photocatalytic hydrogen evolution rate is still limited mainly by fast recombination rate, poor solar energy utilization and lack of surface-active sites for H2 reduction. This review will highlight particularly recent findings in metal-sulfide-based photocatalysts for hydrogen evolution reactions, considering the swift development and excellent research in this field. Following a brief overview of fundamental properties, we will explore state-of-the-art strategies for enhancing H2 generation efficiencies over the pristine, heterostructured and co-catalayzed metal-sulfide photocatalysts.
27 citations
23 citations
TL;DR: In this article , the photodegradation capability of MXene-based photocatalysts was investigated and the physicochemical characteristics of the active functional groups present on the surface of the material were discussed.
19 citations
TL;DR: In this paper , a large-scale preparation of graphdiyne (GDY) for photocatalytic water splitting for hydrogen evolution is presented, and the hydrogen evolution activity of GDY/CdSe-20, a type of composite material, reached 6470 μmol g−1 h−1 , which is 461 and 40 times higher than that of GDy and CdSe, respectively.
18 citations
01 Jan 2022-Journal of Materials Chemistry C. Materials for Optical, Magnetic and Electronic Devices
TL;DR: In this article , a hexagonal molybdenum carbide (Mo2C) with a similar structure to Pt as a cocatalyst has been extensively researched in the field of photocatalytic hydrogen evolution.
Abstract: Hexagonal molybdenum carbide (Mo2C) with a similar structure to Pt as a cocatalyst has been extensively researched in the field of photocatalytic hydrogen evolution. However, owing to its limited hydrogen-evolution...
14 citations
References
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TL;DR: TiO2/perovskite (CsPbBr3) S-scheme heterojunctions synthesized by a facile electrostatic-driven self-assembling approach are developed which greatly promotes the separation of electron-hole pairs to foster efficient CO2 photoreduction.
Abstract: Exploring photocatalysts to promote CO2 photoreduction into solar fuels is of great significance. We develop TiO2/perovskite (CsPbBr3) S-scheme heterojunctions synthesized by a facile electrostatic-driven self-assembling approach. Density functional theory calculation combined with experimental studies proves the electron transfer from CsPbBr3 quantum dots (QDs) to TiO2, resulting in the construction of internal electric field (IEF) directing from CsPbBr3 to TiO2 upon hybridization. The IEF drives the photoexcited electrons in TiO2 to CsPbBr3 upon light irradiation as revealed by in-situ X-ray photoelectron spectroscopy analysis, suggesting the formation of an S-scheme heterojunction in the TiO2/CsPbBr3 nanohybrids which greatly promotes the separation of electron-hole pairs to foster efficient CO2 photoreduction. The hybrid nanofibers unveil a higher CO2-reduction rate (9.02 μmol g–1 h–1) comparing with pristine TiO2 nanofibers (4.68 μmol g–1 h–1). Isotope (13CO2) tracer results confirm that the reduction products originate from CO2 source. Rational design and fabrication of high-performance photocatalyst is of great importance for CO2 reduction into solar fuel. Here, the authors demonstrate that S-scheme heterojunction TiO2/CsPbBr3 photocatalyst exhibits enhanced CO2 photoreduction activity.
707 citations
TL;DR: Opportune lateral epitaxy of UZNs on the surface of MNs simultaneously improves specific surface area, pore diameter and hydrophilicity of the resulted materials, all of which could be beneficial to the photocatalytic activity.
Abstract: Photocatalysts derived from semiconductor heterojunctions that harvest solar energy and catalyze reactions still suffer from low solar-to-hydrogen conversion efficiency. Now, MXene (Ti3 C2 TX ) nanosheets (MNs) are used to support the in situ growth of ultrathin ZnIn2 S4 nanosheets (UZNs), producing sandwich-like hierarchical heterostructures (UZNs-MNs-UZNs) for efficient photocatalytic H2 evolution. Opportune lateral epitaxy of UZNs on the surface of MNs improves specific surface area, pore diameter, and hydrophilicity of the resulting materials, all of which could be beneficial to the photocatalytic activity. Owing to the Schottky junction and ultrathin 2D structures of UZNs and MNs, the heterostructures could effectively suppress photoexcited electron-hole recombination and boost photoexcited charge transfer and separation. The heterostructure photocatalyst exhibits improved photocatalytic H2 evolution performance (6.6 times higher than pristine ZnIn2 S4 ) and excellent stability.
351 citations
TL;DR: In this article, a ternary Ni2P cocatalysted two-dimensional (2D)/2D SnNb2O6/CdS-diethylenetriamine (SNO/S-D) system was designed and fabricated.
Abstract: Step-scheme (S-scheme) photocatalytic system has been considered as an effective method for solar energy conversion by utilizing broadband solar energy, realizing easy separation of photoexcited carriers and strong redox ability. Herein, the novel ternary Ni2P cocatalysted two-dimensional (2D)/2D SnNb2O6/CdS-diethylenetriamine (SNO/CdS-D) system was designed and fabricated. The S-scheme SNO/CdS-D heterostructure gives photocatalytic hydrogen production of 7808 μmol g−1 h−1, which is about 130.13 and 2.35 times stronger than that of SNO and CdS-D. Further, noble-metal-free Ni2P cocatalyst is decorated into SNO/CdS-D heterostructure, the photocatalytic hydrogen evolution performance could be enhanced to 11,992 μmol g−1 h−1. Additionally, XPS analysis and DFT calculation revealed the carriers moves from CdS-D to SNO and then to Ni2P in the Ni2P-SNO/CdS-D nanocomposite. This work will give a reliable and clear insight into the interface and surface design of the 2D catalysts and offer a broadband photocatalytic hydrogen evolution process without noble metal cocatalysts.
307 citations
TL;DR: In this paper, a graphitic carbon nitride/rGO/perylene diimide polymer (g-C3 N4 / rGO/PDIP) Z-scheme heterojunction is successfully constructed to realize high-flux charge transfer and efficient photocatalytic overall water splitting.
Abstract: A graphitic carbon nitride/rGO/perylene diimide polymer (g-C3 N4 /rGO/PDIP) Z-scheme heterojunction is successfully constructed to realize high-flux charge transfer and efficient photocatalytic overall water splitting. A giant internal electric field in the Z-scheme junction is built, enabling the charge separation efficiency to be enhanced dramatically by 8.5 times. Thus, g-C3 N4 /rGO/PDIP presents an efficient and stable photocatalytic overall water splitting activity with H2 and O2 evolution rate of 15.80 and 7.80 µmol h-1 , respectively, ≈12.1 times higher than g-C3 N4 nanosheets. Meanwhile, a notable quantum efficiency of 4.94% at 420 nm and solar-to-hydrogen energy-conversion efficiency of 0.30% are achieved, prominently surpassing many reported g-C3 N4 -based photocatalysts. Briefly, this work throws light on enhancing the internal electric field by interface control to dramatically improve the photocatalytic performance.
273 citations
TL;DR: In this paper, the fundamental aspects of 2D MoS2 cocatalysts have been elaborated, including structural design principles, synthesis strategies, strengths and challenges, and the modification strategies of two-dimensional MoS 2 H2-evolution cocatalyst including doping heteroatoms.
250 citations