Surfaces and Interfaces
·
2024
·
IF 5.7
Zhonghui Han,Xiaobin Yang,Xinnan Shi,Leyao Wu,Peng Hu,Haibo Fan,Feng Teng
The band structure of heterojunction plays an important role in the performance of actual application and can be adjusted by the change of preparation condition. Herein, Cu 2 O nanofilms with different band structures were prepared via electrodeposition method by modifying the solution environment. With the value of pH increased from 7 to 12, the conductivity of the Cu₂O nanofilms shifted from n-type to p-type. Combined the obtained Cu 2 O film with TiO 2 nanoarray, the Cu 2 O/TiO 2 heterojunction were prepared. The photoelectrochemical performance of the Cu 2 O/TiO 2 heterojunction was affected by the interfacial band structure. The T7 sample has higher photocurrent (450 μA) caused by the unique S-scheme band structure, the T11 sample with a p-n junction structure takes second place (225 μA). The n-n type II heterojunction has the lowest photocurrent (20 μA). The Fermi level of Cu 2 O nanofilm was affected by the type of defects, such as oxygen and copper vacancies, leading to changes of band structure at the interface between Cu 2 O and TiO 2 . The obtained result further illustrates the importance of energy band engineering, and provides route and sight for the development and application of Cu 2 O/TiO 2 heterojunction.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Aizhu Chen,Xuhui Yang,Lijuan Shen,Ying Zheng,Min-Quan Yang
Loading cocatalysts onto semiconductors is one of the most popular strategies to inhibit charge recombination, but the efficiency is generally hindered by the localized built-in electric field and the weakly connected interface. Here, this work designs and synthesizes a 1D P-doped CdS nanowire/Ni 2 P heterojunction with gradient doped P to address the challenges. In the composite, the gradient P doping not only creates a funneled bandgap structure with a built-in electric field oriented from the bulk of P-CdS to the surface, but also facilitates the formation of a tightly connected interface using the co-shared P element. Consequently, the photogenerated charge carriers are enabled to be pumped from inside to surface of the P-CdS and then smoothly across the interface to the Ni 2 P. The as-obtained P-CdS/Ni 2 P displays high visible-light-driven H 2 evolution rate of ≈8265 µmol g −1 h −1 , which is 336 times and 120 times as that of CdS and P-CdS, respectively. This work is anticipated to inspire more research attention for designing new gradient-doped semiconductor/cocatalyst heterojunction photocatalysts with bridged interface for efficient solar energy conversion.
研究领域:
材料科学
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能源转换
·
光催化技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Tao Yu,Tao Xie,Wei Zhou,Yizhong Zhang,Yiliang Chen,Boyu Shao,Wan-Qian Guo,Xin Tan
Tuning the structural defects of graphite carbon nitride (g-C3N4) is an effective strategy to modify its band structure and promote charge separation, but it is still limited by complex and harsh preparation processes. Herein, g-C3N4 with nitrogen defects were fabricated by one-pot thermal polymerization of urea and fumaric acid. The N–(C)3 site, being the active site for photocatalytic hydrogen evolution, reached at a rate of 94.1 μmol·h–1, which was approximately 2.64 times that of the original g-C3N4. Nitrogen defective g-C3N4 had more electrons and stronger H2O molecule adsorption capacity, identified by systematic experiments and DFT calculations. The carboxyl group of fumaric acid reacted with amino group of urea to prevent self-polymerization process of urea and induce nitrogen defects. The changed band structures promoted the absorption of visible light, effective separation of charge, and increased hydrogen evolution driving force. This work will provide a simple and green approach to prepare nitrogen defective g-C3N4 with tunable band structures.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 11
·2940
·
IF 5.076
Bingke Zhang,Shengwen Fu,Dongbo Wang,Shujie Jiao,Zhi Zeng,Xiangyu Zhang,Zhikun Xu,Yaxin Liu,Chenchen Zhao,Jingwen Pan,Donghao Liu,Jinzhong Wang
The photocatalysis technique has been proven to be a promising method to solve environmental pollution in situations of energy shortage, and has been intensively investigated in the field of pollutant degradation. In this work, a band structure-controlled solid solution of BiOBrXI1−X(x = 0.00, 0.05, 0.10, 0.15, 0.20, 1.00) with highly efficient light-driven photocatalytic activities was successfully synthesized via simple solvothermal methods. The phase composition, crystal structure, morphology, internal molecular vibration, optical properties, and energy band structure were characterized and analyzed by XRD, SEM, HRTEM, XPS, Raman, and UV Vis DRS. To evaluate the photocatalytic activity of BiOBrXI1−X, rhodamine B was selected as an organic pollutant. In particular, BiOBr0.15I0.85displayed significantly enhanced photocatalytic activity by virtue of modulating the energy band position, optimizing redox potentials, and accelerating carrier separation. Moreover, the enhancement mechanism was elucidated on the basis of band structure engineering, which provides ideas for the design of highly active photocatalysts for practical application in the fields of environmental issues and energy conservation.Keywords:BiOBrXI1−X;solid solution;photocatalytic degradation;band structure engineering
研究领域:
环境科学
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材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
Applied Materials Today
·
2022
·
IF 8.663
Wei Jiao,Lili Zhang,Ruiquan Yang,Jing Ning,Lei Xiao,Yifan Liu,Jianyi Ma,Nasir Mahmood,Xian Jian
Increasing visible light absorption and constructing an active surface for TiO 2 have long been pursued to obtain high photocatalytic activities. Modifying TiO 2 at an atomic scale is desirable to optimize its surface state and band structure but remains a huge challenge. Herein, we developed an ultrasmall (∼5 nm) visible-light-responsive TiO 2 photocatalyst with a novel hybrid structure (TiO 2 /C) through a chemical vapor deposition process on large scale. Environmental in-situ transmission electron microscope studies confirmed the anatase TiO 2 with a monolayer carbon shell in a hybrid structure. The resulted structure possesses narrowed bandgap 2.83 eV, favoring the enhanced visible-light-responsive photocatalytic activity. Density functional theory (DFT) simulations confirm the tunable mechanism of carbon-induced localized energy band within the bandgap of TiO 2 . As a physical barrier without turning TiO 2 black, the monolayer carbon shell stabilizes Ti 3+ inside TiO 2, facilitates the separation of photo-induced carriers and enriches abundant absorbing sites of target pollutants. Consequently, the TiO 2 /C exhibits outstanding photocatalytic performance in both photoelectrochemical water oxidation and dye degradation under visible light besides superior activity for hydrogen evolution under simulated sunlight irradiation. This design proved a meaningful strategy in obtaining visible-light-responsive photocatalysts with a stable active surface for industrial application.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Yaru Ni,Wei Wang,Wenjuan Huang,Chunhua Lu,Zhongzi Xu
A new idea was employed to simultaneously reduce graphene oxide (GO) and wrap it on the surface of high-reactive anatase TiO 2 for fabricating novel TiO 2 -graphene (GP) hybrid materials. The process was based on the surface negatively charged property of GO. With the introduction of strong chemical interaction between TiO 2 and GP, the GP wrapped TiO 2 gives a strong red-shift of the light absorption edge and a further narrowed bandgap compared to that of GP randomly supported TiO 2 . This structure can also significantly enhance the separation efficiency of photogenerated electrons and holes. Furthermore, in contrast to the normal anatase TiO 2 , as-prepared TiO 2 is dominated with the high-reactive {0 0 1} facet. The superiority of the formed “core–shell” structure is confirmed by photocatalytic degradation of methylene blue (MB) under the xenon lamp and visible light irradiation. New photocatalytic mechanisms are also proposed based on the obtained results. This work may open a new doorway for new significant application of GP to prepare more GP-based high-reactive photocatalysts for environmental protection.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Peijie Ma,Xu Zhang,Cong Wang,Zhiwei Wang,Kaiwen Wang,Yibo Feng,Jiaxing Wang,Yadi Zhai,Jiguang Deng,Lihua Wang,Kun Zheng
Polymeric carbon nitride (C 3 N 4 ) is a very attractive candidate to produce photocatalytic hydrogen peroxide (H 2 O 2 ) due to its low-cost, metal-free characteristics. However, the low efficiency would limit its development to higher yields because of insufficient light absorption and electron-hole separation. Here, we developed a simple method to anchor CN quantum dots (QDs) onto g-C 3 N 4 nanosheets to form a homojunction structure (HJ-C 3 N 4 ), which could improve photocatalytic performance largely without introducing metal elements. Its superior efficiency is a result of the band alignment by the homojunction structure providing excellent electron-hole separation and QDs providing suppressed recombination. Simultaneously, the light responsiveness of QDs endows a wide spectrum-responsive adsorption and enhances the adsorption intensity. The H 2 O 2 yield of the HJ-C 3 N 4 reached 115 μmol L −1 h −1 in pure water by visible light, which has an 8.6x higher production than g-C 3 N 4 nanosheets . The material design of 0D/2D homojunction could be extended to other materials with specific band alignment.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Zhengjie Su,Xinru Wu,Dong-Hau Kuo,Baoqian Yang,Binghong Wu,Longyan Chen,Pengkun Zhang,Jinguo Lin,Dongfang Lu,Xiaoyun Chen
Herein, an Ag/S co-doped Bi2O3-based sulfur oxide catalyst was prepared via a facile green method. The Ag/S–Bi2O3 catalyst with suitable Ag/S doping demonstrated super visible light photocatalytic hydrogen evolution (PHE) at 7.52 mmol g−1 h−1, with an apparent quantum efficiency (AQE) of 8.67% at 420 nm. Ag/S co-doping can adjust the energy band structure of an oxidation type Bi2O3 catalyst, converting it into a visible light hydrogen production catalyst suitable for hydrogen production. Sulfur doping adjusts the content of oxygen vacancies to enhance the surface active sites, and the introduction of noble metal silver endows the catalyst with more excellent electrical conductivity and electron trapping ability. Thus, Bi2O3 with Ag/S co-doping produced a suitable energy band structure, enhanced the content of oxygen vacancies and the number of surface active sites, and endowed the catalyst with excellent electrical conductivity and electron trapping ability, significantly producing catalysts with excellent visible light PHE activity. Furthermore, Ag/S–Bi2O3-3 exhibited super visible light PHE activity and excellent stability and persistence and is expected to play a potential role in the field of PHE reactions (PHERs).
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Tingting Li,Chengcheng Sun,Chang Xue,Yutao Jiang,Jian Zhang,Lijuan Zhao
Iron (Fe) doped ZnSe microspheres were fabricated by solvothermal method . X-ray diffraction (XRD), Raman analysis, Fourier transform infrared (FT-IR) spectra and X-ray photoelectron spectroscopy (XPS) results indicate that Fe 2+ cations were incorporated into the zinc blende ZnSe lattices successfully and uniformly distributed in sample. SEM images displayed that doping with Fe 2+ cations did not change the morphology of microspheres . The growth mechanism of Fe-doped ZnSe microspheres was proposed. The band gap increases and photoluminescence (PL) peaks in visible region show blue-shift as doping with Fe ions . In addition, a reduction in PL lifetimes in visible range was also observed, which may be due to the increase in non-radiative energy transfer between Fe 2+ doping in the ZnSe matrix. The 5 E↔ 5 T 2 transition of Fe 2+ in the 3.6–5.5 μm spectral range was observed in Fe-doped sample at low temperature.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Lijia Huang,Ge He,Yi Yuan,Tian Cheng Zhang,Yan Wang,Shaojun Yuan
Rationally regulating the photogenerated carrier transfer behavior and band structure of TiO2 through metal doping is an effective strategy for enhancing the photocatalytic activity in the removal of malodorous gas hydrogen sulfide (H2S). In this study, TiO2 modified with the doping of Group IIIA metal ions (Al3+, Ga3+, and In3+) was utilized as an efficient photocatalytic desulfurizer under ultraviolet irradiation. Among these samples, the 4% In-TiO2 exhibited the best photocatalytic H2S removal efficiency of 100% for a duration of 120 min, nearly 3 times higher than that of commercial P25 TiO2. The UV–vis DRS and PL spectra demonstrated that the incorporation of Group-IIIA metal ions into TiO2 resulted in the formation of a shallow acceptor level above the valence band in the energy band structure, which induced a slight redshift at the edge of the visible light absorption band and reduced the electron–hole recombination rate. In situ DRIFTS and DFT calculations revealed that the adsorption and activation of H2S occurred simultaneously on In-TiO2, facilitated by its strong oxygen vacancy formation and adsorption capability. The ln3+ doping into TiO2 promoted photothermal-catalytic oxidation reaction on the surfaces of In-TiO2, thereby significantly enhancing the desulfurization efficiency of H2S. This study not only offers a deeper understanding of the regulated band structure of TiO2 by doping of Group IIIA metal ions, but also provides a promising and green photocatalytic desulfurizer of In-TiO2 for efficient removal of H2S.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yaqiang Wang,Jiaman Wei,Yi Wu,Wei Yu,Xin Guo
Crystalline structures, as the basics of materials, are tightly associated with transport properties. Designing a structure through doping, alloying, and phase engineering to optimize thermoelectric transport properties has always been a crucial strategy in thermoelectrics. In this work, hybrid architectures containing an inherently long-range, nearly cubic framework as well as localized short-range noncubic lattice distortions, are designed in the pristine CuInTe2 chalcopyrites by a unique high-pressure technology. As a result, the long-range order structures motivate degeneracy in electronic bands, markedly improving the electrical transport properties. Meanwhile, suppressed lattice thermal conductivity due to strong phonon scattering is achieved by the short-range disorder structures composed of dense dislocations introduced by pressure. The above incorporation effects lead to a distinguished thermoelectric performance of zT = 1.13 at 773 K for pristine CuInTe2 prepared under 3 GPa. This study demonstrates the bright potential of high pressure as a significant approach in designing bespoke crystalline structures for tuning thermoelectric transport properties.
研究领域:
材料科学
·
热电材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yan Shang,Jing Xu,Yue Ma,Zezhong Li,Qian Li
Photocatalytic hydrogen production was a potential strategy to solve energy shortage and environmental pollution. One of the valuable research directions for improving photocatalytic efficiency was to prepare catalysts in an efficient and low-cost way. Lamellar Sm 2 WO 6 and dodecahedron Zeolitic Imidazolate Framework-67 (ZIF-67) have been prepared successfully based on morphology control. Sm 2 WO 6 /ZIF-67 was prepared by a novel in situ growth scheme, which was confirmed by crystal structure, morphology and elemental composition analysis . The close interaction between Sm 2 WO 6 and ZIF-67 was confirmed by photoelectrochemical measurements. Based on the design of band structure , the S-type heterojunction was constructed. The research results of this paper provided a reference for exploring non-noble metal composite materials and demonstrated great potential in photocatalytic.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 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）