JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Bo Lv,Xuefan Feng,Xiaoping Xi,Xinyan Feng,Zhenyu Yuan,Yu Yang,Fuqin Zhang
Heterogeneously structured materials with supported precious metals , such as Pd, Pt, and Ru, as co-catalysts are important catalysts for efficient photocatalytic water splitting. However, the high costs and low reserves of precious metals have been an obstacle to their application in hydrogen production . In this work, the noble-metal-free Cd 0.3 Zn 0.7 S solid solution was designed and synthesized with an optimized molar ratio of Cd/Zn for the best visible light photocatalytic performance. In addition, a heterojunction hybrid material formed between the Cd 0.3 Zn 0.7 S and Ni(OH) 2 nanosheet was engineered to improve the utilization of light and to inhibit the recombination of holes and electrons. Ni(OH) 2 nanosheets assisted the transfer of the photoexcited electrons to participate in the reduction reactions which is critical for efficient and rapid catalytic hydrogen production. The photoelectrochemical property of the hybrid material was investigated with UV–vis absorption, photoluminance (PL) and electrochemical impedance spectroscopy measurements. The mechanism of the high-efficiency and low-cost photocatalytic hydrogen production was established by analyzing the hydrogen evolution kinetics. With the success of replacing precious metal with nickel-based surface heterostructure, this work is expected to provide a new type of photocatalyst for the application of photocatalytic hydrogen production.
研究领域:
材料科学
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能源化学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Fang Chen,Mingkun Wu,Yuzhi Xu,Jianjun Zhang,Jun Luo,Mengkui Tian
The purposeful modulation of interfacial charge transfer pathways in heterogeneous structures is an innovative and feasible strategy to improve photocatalysis efficiency. However, it is often characterized by difficulties in charge separation and transport and the high charge recombination limits its applications. Herein, a Cd 0.3 Zn 0.7 S-based heterostructure of Cd 0.3 Zn 0.7 S@Ti 3 C 2 /Ag/CeO 2 was fabricated in which the efficient electron transfer route was designed by synergistic action of Z-scheme and Schottky junction. Serial characterizations and Density-Functional Theory calculations identify the Schottky junction promoted the electrons in Cd 0.3 Zn 0.7 S to transfer to Ti 3 C 2 , whereas the Z-scheme heterojunction accelerated the electrons transfer from CeO 2 to Cd 0.3 Zn 0.7 S@Ti 3 C 2 with Ag acting as the electronic intermediary. Significantly, the optimized Cd 0.3 Zn 0.7 S@Ti 3 C 2 /Ag/CeO 2 exhibited stronger photocatalytic H 2 evolution of 16.3 mmol·g −1 ·h −1 with an apparent quantum efficiency of 29.8 % at 420 nm, which was 4.2 times higher than the pristine Cd 0.3 Zn 0.7 S material. This work offers valuable insights into realizing the desired charge transfer route through artificial heterointerface and a new possibility for applying Cd 1-x Zn x S materials in photocatalytic hydrogen production.
研究领域:
材料科学
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光催化
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能源转换
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Hongbin He,Xuan Jian,Tianxu Zen,Bingbing Feng,Yanan Hu,Zhongqiang Yuan,Zizhen Zhao,Xiaoming Gao,Lei Lv,Zhenheng Cao
The rapid recombination of interfacial charges is considered to be the main obstacle limiting the photocatalytic CO 2 reduction. Thus, it is a challenge to research an accurate and stable charge transfer control strategy. MIL-53 (Al)-S/Cd 0.3 Zn 0.7 S (MAS/CZS-0.3) photocatalysts with chemically bonded interfaces were constructed by in-situ electrostatic assembly of sulfur defect Cd 0.3 Zn 0.7 S (CZS-0.3) on the surface of MIL-53 (Al) (MAW), which enhanced interfacial coupling and accelerated electron transfer efficiency. An adjustable proportion of syngas (H 2 /CO) was prepared by photothermal catalytic CO 2 reduction at micro-interface. and the optimal yield of CO (66.10 μmol∙g −1 ∙h −1 ) and H 2 (71.0 μmol∙g −1 ∙h −1 ) was realized by the MAS/CZS-0.3 photocatalyst. The improved activity was due to the photogenerated electrons migrated from CZS-0.3 to the adsorption active sites of MAS , which strengthened the adsorption and activation of CO 2 on MAS. The photothermal catalytic CO 2 reduction to CO follows the pathway of CO 2 →*COOH → CO and CO 2 →*HCO 3 – →CO. This work provided a reference for the research, characterization, and application of in-situ anchoring of metal organic frameworks in photothermal catalytic CO 2 reduction, and provided a green path for the supply of Syngas in industry.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2026
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IF 5.9
Fang Chen,Xiao Xiao,Mingkun Wu,SiYu Cai,Jie Lou,Mengkui Tian,Yi Wang
Hydrogen production via photocatalytic water splitting is an essential technology for renewable energy conversion, but its real-world application is restricted by insufficient carrier separation efficiency and compromised stability of semiconductor-based catalytic materials. In this study, we address these challenges by designing a sandwich-like Cd 0.3 Zn 0.7 S@Ti 3 C 2 MXene Schottky junction catalyst. First, we precisely tuned the molar ratio of Zn/Cd precursors to synthesize Cd x Zn 1-x S solid solutions, and found that Cd 0.3 Zn 0.7 S nanosheets exhibited the optimal photocatalytic hydrogen evolution rate, due to its harmonious absorption of visible light and optimized band structure. Next, multilayer Ti 3 C 2 MXene nanosheets were prepared via hydrofluoric acid (HF)-assisted etching of Ti 3 AlC 2 MAX phase, and then composited with Cd x Zn 1-x S precursor to form the Cd 0.3 Zn 0.7 S@Ti 3 C 2 heterojunction. When the loading capacity of Ti 3 C 2 MXene is optimized, the composite exhibits a maximum hydrogen production rate of 9.4 mmol·h −1 ·g −1 , representing a 2.5-fold enhancement compared to pristine Cd 0.3 Zn 0.7 S and a 7.5-fold enhancement compared to pristine Ti 3 C 2 MXene. The Cd 0.3 Zn 0.7 S@Ti 3 C 2 exhibits excellent photocatalytic performance, primarily attributed to its unique sandwich structure and the Schottky junction. Which significantly enhances charge separation efficiency, and effectively suppresses the photocorrosion of Cd 0.3 Zn 0.7 S and ensures superior photochemical stability.This study provides a novel approach for the development of high-performance photocatalysts for water splitting.
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DOI
高影响因子
MATERIALS SCIENCE & ENGINEERING R-REPORTS
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2024
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IF 31.6
Jie Chen,Zhenzi Li,Haitao Yu,Xiuwen Wang,Ying Xie,Wei Zhou
Interface engineering is vital for promoting charge separation in photocatalysis. Herein, a twin crystal interface in Cd 0.3 Zn 0.7 S is engineered, which leads to a variation of the electric polarization along the interface and the formation of a periodic quantum well along z axis. The periodic quantum well could effectively facilitate the oriented charge separation and significantly reduce the diffusion distance simultaneously. Density functional theory (DFT) calculations confirm that Cd 0.3 Zn 0.7 S twin crystal possesses a relative low work function and an appropriate hydrogen adsorption Gibbs free energy (ΔG H* ), making each step of the cascaded hydrogen evolution reactions optimized. As a result, the resultant twin crystal exhibits an excellent visible light photocatalytic hydrogen evolution rate (13148.98 μmol·g −1 ·h −1 ), which is almost 10 and 30 times higher than those of CdS and ZnS. Importantly, it also shows a good stability because of the formation of twin crystal interface. In addition, the introduction of S vacancy defect results in narrowing the band gap and extending the photo-response to long wavelength region. Such a twin crystal interface engineering strategy provides a basic guideline for designing high-efficient photocatalysts with tunable electric polarization.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
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