ACS Applied Materials & Interfaces
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2024
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IF 8.3
Chun Sun,Yiwei Zhao,Yelin Ding,Fuhao Zhang,Zhihui Deng,Kai Lian,Zhengtong Wang,Jiazhi Cui,Wengang Bi
A novel TiO2–CsPbBr3(Q) photocatalyst is proposed and rationally constructed, where CsPbBr3 perovskite quantum dots (QDs) of various sizes inside mesopore TiO2 (M-TiO2) are integrated. These perovskite QDs, generated in situ within M-TiO2, establish a type-II homojunction. Interestingly, a Z-scheme heterojunction is simultaneously formed at the interface between CsPbBr3 and TiO2. Due to the coexistence of the type-II homojunction and the Z-scheme heterojunction, photogenerated electrons are effectively transferred from TiO2 to CsPbBr3, thereby suppressing carrier recombination and thus enhancing the degradation of rhodamine B (RhB). Compared with pure CsPbBr3 and TiO2, TiO2–CsPbBr3(Q) shows significantly enhanced photocatalytic performance for RhB degradation. The degradation efficiency of RhB in the presence of the TiO2–CsPbBr3(Q) attains 97.7% in 5 min under light illumination, representing the highest efficiency observed among photocatalysts based on TiO2. This study will facilitate the development of superior semiconductor catalysts for photocatalytic applications.
研究领域:
材料科学
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光催化
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纳米技术
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环境科学
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产品关联
DOI
PubMed
高影响因子
Coatings
·
2020
·Vol. 10
·期 4
·399
·
IF 2.436
Qiannan Ye,Xu Zhang,Dong Guo,Wei Xu,Honglong Ning,Tian Qiu,Jinxiong Li,Danqing Hou,Rihui Yao,Junbiao Peng
High-quality SnO2:Si films and SnO2:10 at.% Ga films were prepared by the solution method. The roughness of films is below 1.08 nm, and possess exceptional transparency (>75%) and decent semiconductor properties. Based on this, the SnO2:Si/SnO2: Ga homojunctions with different Si doping concentrations were prepared. It is found that the conductivity of the SnO2:Si thin film gradually increases, and the rectification characteristics of the homojunction are optimized with increasing Si doping content. The SnO2:15 at.% Si/SnO2:10 at.% Ga homogeneous junction has the best performance, the turn-on voltage is as low as 5.6 V, and it also exhibits good unidirectional conductivity. The photoresponse of the SnO2:15 at.% Si/SnO2:10 at.% Ga homojunction under the lights of red, yellow, and purple was explored respectively. The result shows that the device responds strongly to purple light. Compared with the test results in the dark environment, the device current increases by two orders, which is expected to be applied in the field of near-ultraviolet detection.Keywords:solution method;SnO2;homojunction;highly transparent;photoresponse
研究领域:
材料科学
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光电学
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半导体物理
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Junhao Cai,Yaru Peng,Po Hu,Yuan Zhou,Qiaoge Yao,Hao Lyu,Youtang Gao
The light absorption, active sites, and charge carriers separation of photocatalysts are extremely important factors in the field of photocatalysis. Near-perfect lattice-matched homojunction constructed using disorder engineering and doping strategies is an effective strategy to improve photocatalytic activity. Herein, we developed crystalline TiO 2 nanoparticles (NPs) and Ti 3 C 2 T x MXene-derived C-doped amorphous TiO x homojunction (TCT) at room temperature. In this homojunction, TiO 2 NPs are evenly distributed on the surface of the C-TiO x nanosheet to form a type-II structure, which promotes the separation of photogenerated carriers. The light absorption range of TCT extends to 550 nm due to the presence of intermediate energy levels in C-TiO x , which increases its photon absorption capacity. Moreover, TCT possesses a large number of oxygen vacancies, which are beneficial for improving the adsorption and degradation of pollutants. These characteristics of TCT could significantly improve its photodegradation performance for tetracycline. Interestingly, the precursor mass ratio of TCT with the best degradation efficiency is different under different illumination conditions, which is attributed to the different band gaps of C-TiO x and TiO 2 NPs resulting in different light absorption ranges. This work provides a new approach to rationally designing crystalline and amorphous homojunction for photocatalytic applications.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
PHYSICA SCRIPTA
·
2025
·Vol. 100
·期 3
·035954
·
IF 2.6
Lairong Yan,Penghui Ren,Jianping Yang,Zhenxuan Ding,Hao Hu,Guoqiang Zhang,Yanbin Zhang,Ping Lin,Lingbo Xu,Peng Wang,Can Cui
Perovskite-based semiconductor photodetectors have attracted wide attention in the photoelectric fields. By local MoO3 induction, MoO3:CsPbBr3−CsPbBr3 homojunction photodetector was constructed by chemical vapor deposition, exhibiting not only excellent response speed in the scale of microsecond, but also high responsivity of 247.1 A W−1 and detectivity (8.7 × 1012 Jones), roughly an order of magnitude higher than that of CsPbBr3 devices. Ultraviolet photoelectron spectroscopy measurements show that the Fermi level moves closer to the top of the valence band due to the local MoO3 induction, leading to the conversion of weak p-type CsPbBr3 to a strong p-type semiconductor, which is consistent with the calculation result based on density functional theory (DFT). The band alignment in the homojunction accelerates the photo-generated carrier separation and transfer, thus improving the photoelectric performance of MoO3:CsPbBr3−CsPbBr3 homojunction. Our results provide a new strategy to design photodetectors with excellent performance by constructing homojunctions with perovskite on different substrates.
研究领域:
材料科学
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光电子学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Chenxuan Wang,Xinyi Ma,Zhongyuan Fu,Xiaoyun Hu,Jun Fan,Enzhou Liu
A twinned Mn 0.5 Cd 0.5 S ( T -MCS) homojunction, consisting of wurtzite and zinc-blende Mn 0.5 Cd 0.5 S with different energy band structures, was fabricated using a facile hydrothermal method, resulting in the formation of a type-II bulk phase twinned homojunction. Furthermore, NiCo 2 S 4 nanoparticles were deposited on the surface of T -MCS to form a surface heterojunction. The activities of T -MCS and NiCo 2 S 4 / T -MCS were tested in the photocatalytic H 2 evolution reaction. T -MCS exhibits a superior H 2 evolution rate of 61.4 mmol∙g −1 ∙h −1 under visible light (λ > 420 nm) irradiation owing to faster bulk phase charge separation, which is 8.2 and 1.9 times higher than those of wurtzite and zinc-blende Mn 0.5 Cd 0.5 S, respectively. Moreover, NiCo 2 S 4 can facilitate interfacial electron transfer and can lower the H 2 evolution overpotential; the H 2 evolution rate is boosted to 127.3 mmol∙ g −1 ∙h −1 with an apparent quantum yield (AQY) of 23.4% with irradiation of 2 wt%-NiCo 2 S 4 / T -MCS under 400 ± 7.5 nm light. This work demonstrates that bulk phase twinned homojunctions and a surface heterojunction can combine to promote bulk and interfacial charge transfer and separation, simultaneously improving the kinetics of photocatalytic H 2 evolution.
研究领域:
材料科学
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能源科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
·
IF 10.9
Tao Zhang,Bo Li,Chaofeng Wang,Shuilin Wu,Shengli Zhu,Hui Jiang,Yufeng Zheng,Zhaoyang Li,Zhenduo Cui,Yu Zhang,Paul K Chu,Xiangmei Liu
Photocatalysis has been a research hotspot in recent years, and the design and modification of photocatalysts have been the key points. Common methods for designing photocatalysts, including constructing heterojunctions and homojunctions, have been developed on the basis of heterojunctions. In this study, two homojunctions of manganese dioxide (MnO 2 ), including a high-index crystal plane homojunction and a general homojunction, are prepared using a stepwise hydrothermal method. Using a capping agent, the high-index crystal surface of the MnO 2 is exposed. It is found that the electron transport efficiency between the two components of the homojunction with high-index planes is higher and the adsorption capacity of the oxygen is stronger, which leads to higher photocatalytic efficiency. In addition, the newly designed high-index homojunction is used for the treatment of bacterial infections, and it kills Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ) at rates of 99.95% ± 0.04% and 99.31% ± 0.25%, respectively. It also has excellent therapeutic effects on mouse wounds, which implies superb practical application value. This work provides a new strategy for the improved design of homojunctions and the application of photocatalytic materials.
研究领域:
材料科学
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生物学
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医学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Zhengliang Zhao,Zhu Shu,Jun Zhou,Tiantian Li,Kai Wang,Jingyang Song
LiCl-based molten salts have been widely used to induce the polymerization of melamine-derived monomer or intermediate into triazine-based or heptazine-based crystalline carbon nitride . Nevertheless, the role of LiCl beyond lowering melting point has not been fully revealed, and pure LiCl was exclusively reported to induce the formation of triazine-based crystalline counterpart. Herein, we firstly found that single LiCl can promote the deep deamination of melon-based pristine carbon nitride (PCN) to heptazine-based crystalline counterpart. As a result, a heptazine-/triazine-based crystalline carbon nitride homojunction was in situ formed by single LiCl-induced deamination and phase transition of PCN. It exhibits a favorable photocatalytic H 2 evolution reaction rate 18.3 times higher than PCN, which benefits from the promoted charges separation between heptazine and triazine units in phase homojunction. This work emphasizes that single LiCl can realize diverse modulation of carbon nitride framework with advanced photocatalytic activity.
研究领域:
材料科学
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化学工程
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
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IF 10.9
Leini Wang,Gang He,Wenhao Wang,Xiaofen Xu,Shanshan Jiang,Elvira Fortunato,Rodrigo Martins
The homojunction based on Ti 3 C 2 T x MXene-doped In 2 O 3 and indium oxide as the channel layer is realized in high-performance metal oxide thin film transistors (TFTs). Doping of MXene into In 2 O 3 results in n-type semiconductor behavior, realizing tunable work function of In 2 O 3 from 5.11 to 4.79 eV as MXene content increases from 0 to 2 wt.%. MXene-doped In 2 O 3 -based homojunction TFT presents optimal performance with electron mobilities of greater than 27.10 cm 2 /(V s) at 240 °C, far exceeding the maximum mobility of 3.91 cm 2 /(V s) for single-layer In 2 O 3 TFTs. The improved performance originates from boosting of a two-dimensional electron gas (2DEG) formed at carefully engineered In 2 O 3 /MXene-doped In 2 O 3 oxide homojunction interface. Besides, the transformation in conduction mechanism leads to better stability of MXene-doped In 2 O 3 homojunction devices compared to undoped bilayer In 2 O 3 . Low-frequency noise further illustrates that doping MXene into In 2 O 3 helps to reduce the device trap density, demonstrating excellent electrical performance. A resistor-loaded unipolar inverter based on In 2 O 3 /0.5% MXene-In 2 O 3 TFT has demonstrated full swing characteristics and a high gain of 13. The effective doping of MXene into constructed homojunction TFTs not only contributes to improved stability, but also provides an effective strategy for designing novel homojunction TFTs for low-cost oxide-based electronics.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2020
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IF 6.146
Zhuwang Shao,Xiao Meng,Hong Lai,Dafeng Zhang,Xipeng Pu,Changhua Su,Hong Li,Xiaozhen Ren,Yanling Geng
In this study, Ni 2 P-Cd 0.9 Zn 0.1 S (NPCZS) composites were synthesized by coupling tetrapod bundle Cd 0.9 Zn 0.1 S (CZS) and coralline-like Ni 2 P (NP) via a simple calcination method. CZS shows outstanding activity in photocatalytic hydrogen evolution (1.31 mmol h −1 ), owing to its unique morphology and heterophase homojunctions (ZB/WZ), which accelerate the separation and transfer of photogenerated charges. After coupling with NP, the photoactivity of NPCZS was enhanced, and the maximum hydrogen evolution rate of 1.88 mmol h −1 was reached at a NP content of 12 wt%, which was 1.43 times higher than that of pure CZS. The experimental results of the photocatalytic activity, viz. photoluminescence spectra, surface photovoltage spectra, and electrochemical test showed that the enhanced photoactivity of NPCZS should be attributed to the synergistic effects of the novel tetrapod-bundle morphology, heterophase homojunctions, and decoration of the NP co-catalyst. Moreover, the as-prepared NPCZS composites exhibited excellent photostability and recyclability. Herein, we propose a possible mechanism for the enhanced photocatalytic activity.
研究领域:
材料科学
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能源化学
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光催化技术
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Chenrui Liu,He Xiao,Yun Liu,Dejian Li,Hao He,Xiaohan Huang,Wentao Shen,Zhiyan Yan,Zhi Dang,Runliang Zhu
Improving the separation efficiency and transfer ability of photoinduced electrons/holes in pyrite (FeS 2 )-based photocatalytic materials is significant for the photoreduction of hexavalent chromium (Cr(VI)) but still remains a challenge. Herein, a novel homojunction was prepared through in-situ growth of nickel (Ni) doped FeS 2 nanoparticles on FeS 2 nanobelts (denoted as Ni-FeS 2 /FeS 2 ). Systematical characterizations revealed that Ni doped FeS 2 nanoparticles have been successfully in situ grown along the lattice of FeS 2 nanobelts . Photoreduction experiments demonstrated that the Ni-FeS 2 /FeS 2 homojunction with 2 mmol Ni doping contents (denoted as 2Ni-FeS 2 /FeS 2 ) exhibited the optimum Cr(VI) reduction efficiency among the studied catalysts. Density Functional Theory (DFT) calculated results verified that Ni doping could not only be advantageous for the formation of sulfur vacancies but also modify the band gap and band structure of FeS 2 nanoparticles . Moreover, several doping energy levels caused by Ni doping have also appeared near the Fermi level of FeS 2 nanoparticles . The migration paths of electrons and the existence of internal electric field (IEF) in homojunction were further verified by the calculation of work function . To sum up, the doping energy levels and IEF that produced by homojunction played important roles in accelerating the separation efficiency of its photogenerated carriers.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
PubMed
高影响因子
Small
·
2022
·Vol. 18
·期 34
·2201556
·
IF 15.153
Yuxin Liu,Cailing Chen,Yiqiang He,Zhe Zhang,Mingbian Li,Chunguang Li,Xiao-Bo Chen,Yu Han,Zhan Shi
Design and development of highly efficient photocatalytic materials are key to employ photocatalytic technology as a sound solution to energy and environment related challenges. This work aims to significantly boost photocatalytic activity through rich indium vacancies (V In ) In 2 S 3 with atomic p–n homojunction through a one-pot preparation strategy. Positron annihilation spectroscopy and electron paramagnetic resonance reveal existence of V In in the prepared photocatalysts. Mott–Schottky plots and surface photovoltage spectra prove rich V In In 2 S 3 can form atomic p–n homojunction. It is validated that p–n homojunction can effectively separate carriers combined with photoelectrochemical tests. V In decreases carrier transport activation energy (CTAE) from 0.64 eV of V In -poor In 2 S 3 to 0.44 eV of V In -rich In 2 S 3 . The special structure endows defective In 2 S 3 with multifunctional photocatalysis properties, i.e., hydrogen production (872.7 µmol g −1 h −1 ), degradation of methyl orange (20 min, 97%), and reduction in heavy metal ions Cr(VI) (30 min, 98%) under simulated sunlight, which outperforms a variety of existing In 2 S 3 composite catalysts. Therefore, such a compositional strategy and mechanistic study are expected to offer new insights for designing highly efficient photocatalysts through defect engineering.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Guanzheng Wang,Wenjiang He,Zhentao Yuan,Lu Li,Xiao Wang,Wenshen Tang,Zhaolin Zhan
The slow diffusion rate of lithium ions limits commercial TiO 2 from being used at scale in LiBs. This paper presents the strategy used to synthesize a homojunction anatase/rutile-TiO 2 core-shell microsphere enriched with oxygen vacancies. Oxygen vacancies and interfacial shared storage accelerate electron mobility and improve lithium-ion diffusion kinetics. Electrochemical AC impedance measurements show that the Li + diffusion coefficient of A/R-TiO 2 -V o 2 samples with oxygen vacancies is (1.14 × 10 -12 cm 2 /s), which is higher than the diffusion coefficient of A/R-TiO 2 samples without oxygen vacancies (9.28 × 10 -14 cm 2 /s). The study of the effect of oxygen vacancy content on crystal structure and lithium-ion storage capabilities was quantitatively modulated. The specific capacity of an A/R-TiO 2 -V o 2 anode containing a moderate number of oxygen vacancies was 405 mAh/g after 450 cycles at 0.5 C, which is 121% of the theoretical maximum. This high-capacity behavior can be mainly attributed to the synergistic effect of core-shell hollow structures, interfacial shared storage, and oxygen vacancies generating additional active sites located at grain boundaries that are available for lithium storage. This strategy of oxygen defect engineering combined with heterojunctions can be extended to other materials with similar dilemmas.
研究领域:
材料科学
·
电化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）