Construction of MXene/Bi<sub>2</sub>WO<sub>6</sub> Schottky Junction for Highly Efficient Piezocatalytic Hydrogen Evolution and Unraveling Mechanism

Ning, Xueer; Hao, Aize; Cao, Yali; Chen, Ruqi; Xie, Jing; Lu, Zhenjiang; Hu, Jindou; Jia, Dianzeng

doi:10.1021/acs.nanolett.3c04959

Cited by 13 publications

(1 citation statement)

References 49 publications

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“…Heading toward a carbon-neutral society, hydrogen has become a notable clean energy source owing to its high energy density and eco-friendly byproducts postcombustion. − However, a drawback exists in the current production method, where a substantial amount of hydrogen is generated through methane catalytic steam reforming, a process notorious for emitting a significant proportion of CO 2 , one of the primary contributors to the greenhouse effect . To combat this environmental challenge, researchers are exploring photocatalytic water splitting, which can enable the storage of renewable solar energy in chemical bonds, as a potential method for green hydrogen production. , Despite numerous studies following the research by Fujishima et al in 1972, the hydrogen production efficiency from this method remains relatively low, falling short of practical requirements . The primary hurdle lies in the limitations of current semiconductor photocatalysts, struggling to meet essential efficiency criteria. − These criteria encompass responsiveness to visible light, rapid separation of photogenerated charge carriers, and the presence of abundant surface-active sites .…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional High-Entropy Selenides for Boosting Visible-Light-Driven Photocatalytic Performance

Wang,

Zhang

et al. 2024

ACS Nano

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High-entropy materials (HEMs) have garnered extensive attention owing to their diverse and captivating physicochemical properties. Yet, fine-tuning morphological properties of HEMs remains a formidable challenge, constraining their potential applications. To address this, we present a rapid, low-energy consumption diethylenetriamine (DETA)-assisted microwave hydrothermal method for synthesizing a series of two-dimensional high-entropy selenides (HESes). Subsequently, the obtained HESes are harnessed for photocatalytic w a t e r s p l i t t i n g . N o t e w o r t h y i s t h e o p t i m i z e d H E S e s , Cd 0.9 Zn 1.2 Mn 0.4 Cu 1.8 Cr 1.2 Se 4.5 , showcasing an output rate of hydrogen of 16.08 mmol h −1 g −1 and a quantum efficiency of ca. 30% under 420 nm monochromatic LED irradiation. It is revealed that the photocatalytic performance of these HESes stems not only from the enlarged specific surface area and enhanced photogenerated charge carrier utilization efficiency but also from the promoted formation of the Cd−H ads bond, influenced by multiple principal elements on the Cd. These findings provide a guide for the design of HEMs tailored for various applications.

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Section: Introductionmentioning

confidence: 99%

Two-Dimensional High-Entropy Selenides for Boosting Visible-Light-Driven Photocatalytic Performance

Wang,

Zhang

et al. 2024

ACS Nano

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Remarkably Boosting Piezocatalytic Performance of Sr_0.5Ba_0.5Nb₂O₆ Piezoceramics via Size Optimization and Oxygen Vacancy Engineering

Dai,

Fan,

Long

et al. 2024

Adv Funct Materials

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Piezocatalysis is capable of harnessing mechanical energy for environmental remediation, which is regarded as a green and promising technology to be exploited. Piezoceramics are struggling to be used as highly efficient piezocatalysts due to their grain size reaching tens of micrometers usually. Herein, a feasible and straightforward method is proposed to turn piezoceramic powders into highly efficient piezocatalysts by integrating size optimization and oxygen vacancy modulation. This strategy is validated by treating lead‐free Sr0.5Ba0.5Nb2O6 (SBN) piezoceramic powders with high‐energy ball‐milling (hBM). The rate constant k value of 46.95 × 10−3 min−1 for rhodamine B (RhB) piezocatalytic degradation of SBN‐hBM‐12h is almost 18 times higher than that of pristine SBN. Besides, the SBN‐hBM‐12 h catalyst performed superior antibacterial properties against Escherichia coli. The enhanced piezocatalytic efficiency is attributed to the introduced abundant oxygen vacancies absorbing and activating O2 into reactive oxygen species. Well‐modulated oxygen vacancy concentration can effectively accelerate the generation and separation of free carriers. However, the excess oxygen vacancies in SBN render the weakened piezoresponse thus suppressing the piezocatalytic activity. This study elucidates the critical role of oxygen vacancies in piezocatalysis and provides insights into the development of efficient piezocatalysts.

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S‐Scheme Heterojunction Engineering of CdS/Bi₂WO₆ in Breakthrough Piezocatalytic Nitrogen Reduction and Hydrogen Evolution: Performance, Mechanism, and DFT Calculations

Ning,

Hao,

Qiu

2024

Adv Funct Materials

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Herein, a novel bismuth tungstate and cadmium sulfide (CdS/Bi2WO6）step‐scheme (S‐scheme) heterojunction piezocatalyst for the first time is developed. The exceptional piezocatalytic nitrogen reduction reaction activity (1.37 mmol L−1 g−1 h−1) is delivered, which is significantly higher compared to pure CdS (0.06 mmol L−1 g−1 h−1) and bare Bi2WO6 (0.45 mmol L−1 g−1 h−1), showing an almost 23‐fold and 3‐fold increase, respectively. This performance greatly exceeds previously reported piezocatalysts and piezo‐photocatalysts. Meanwhile, this catalyst also holds outstanding piezocatalytic hydrogen evolution reaction rate of 1.02 mmol g−1 h−1. Relevant experimental and density functional theory (DFT) calculations results demonstrate that the excellent catalytic capacity of CdS/Bi2WO6 is mainly ascribed to the construction of S‐scheme heterojunction, which greatly promotes piezoelectric performance, enhances the segregating efficiency of charge carriers and redox capacity, regulates electronic structure, optimizes the reaction dynamics processes and reduces the reactions barrier, and induces more active sites. Furthermore, a new piezocatalytic mechanism for the CdS/Bi2WO6 S‐scheme heterojunction is proposed. This research extends the applications of S‐scheme heterojunctions in sustainable energy piezocatalysis and offers insights for designing efficient piezocatalytic systems.

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Construction of MXene/Bi₂WO₆ Schottky Junction for Highly Efficient Piezocatalytic Hydrogen Evolution and Unraveling Mechanism

Cited by 13 publications

References 49 publications

Two-Dimensional High-Entropy Selenides for Boosting Visible-Light-Driven Photocatalytic Performance

Two-Dimensional High-Entropy Selenides for Boosting Visible-Light-Driven Photocatalytic Performance

Remarkably Boosting Piezocatalytic Performance of Sr_0.5Ba_0.5Nb₂O₆ Piezoceramics via Size Optimization and Oxygen Vacancy Engineering

S‐Scheme Heterojunction Engineering of CdS/Bi₂WO₆ in Breakthrough Piezocatalytic Nitrogen Reduction and Hydrogen Evolution: Performance, Mechanism, and DFT Calculations

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Construction of MXene/Bi2WO6 Schottky Junction for Highly Efficient Piezocatalytic Hydrogen Evolution and Unraveling Mechanism

Cited by 13 publications

References 49 publications

Two-Dimensional High-Entropy Selenides for Boosting Visible-Light-Driven Photocatalytic Performance

Two-Dimensional High-Entropy Selenides for Boosting Visible-Light-Driven Photocatalytic Performance

Remarkably Boosting Piezocatalytic Performance of Sr0.5Ba0.5Nb2O6 Piezoceramics via Size Optimization and Oxygen Vacancy Engineering

S‐Scheme Heterojunction Engineering of CdS/Bi2WO6 in Breakthrough Piezocatalytic Nitrogen Reduction and Hydrogen Evolution: Performance, Mechanism, and DFT Calculations

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Product

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Construction of MXene/Bi₂WO₆ Schottky Junction for Highly Efficient Piezocatalytic Hydrogen Evolution and Unraveling Mechanism

Remarkably Boosting Piezocatalytic Performance of Sr_0.5Ba_0.5Nb₂O₆ Piezoceramics via Size Optimization and Oxygen Vacancy Engineering

S‐Scheme Heterojunction Engineering of CdS/Bi₂WO₆ in Breakthrough Piezocatalytic Nitrogen Reduction and Hydrogen Evolution: Performance, Mechanism, and DFT Calculations