CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Yingying Qin,Hong Li,Jian Lu,Fanying Meng,Changchang Ma,Yongsheng Yan,Minjia Meng
In the practical photocatalytic hydrogen evolution process, the light absorption, charge carrier separation and optimizing the activation ability of reactive molecules are the pivotal factors that restrict photocatalytic performance. Hence, we rationally engineer novel CdS/Ti 3+ /N-TiO 2 (TNTC) composite photocatalyst via integrating the evaporation induced self-assembly (EISA) and in-situ hydrothermal method. In the TNTC system, Ti 3+ /O V and doped N respectively locate at below the conduction band (CB) and above the valence band (VB) of TiO 2 to shorten the band gap from two inverse directions, thereby improving light utilization efficiency. The type II heterojunction TNTC with interfacial coupling effect can foster the spatial charge separation and the Ti 3+ can form hydrogenation layer to reduce the activation barrier of H 2 , which all can improve H 2 evolution capacity. Integrating with the above advantageous qualities, the 10%CdS/Ti 3+ /N-TiO 2 (TNTC10) has the best photocatalytic H 2 evolution activity (1118.5 μmol), which is about 15 and 40 times higher than that of CdS (71.6 μmol) and Ti 3+ /N-TiO 2 (TNT, 27.7 μmol), respectively. Furthermore, we also test the photocatalytic activity of 10%CdS/N-TiO 2 (NTC10) to facilitate comparison with TNTC10. Expectedly, the photocatalytic activity of TNTC10 is 6 times higher than that of NTC10 (178.3 μmol), uncovering that the Ti 3+ hydrogenated layer plays a pivotal role in boosting the efficiency of H 2 evolution. It is hoped that this work will provide a new cognitive perspective and understanding for building new-fashioned hydrogen evolution photocatalysts.
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
MATERIALS LETTERS
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2019
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IF 3.019
Zhiyi Zhang,Donglin Guo,Xiaojiong Yang,Jiazheng Zhang
Ytterbium oxide wet gels are synthesized with the dual assistant effects of propylene oxide and citric acid and processed to ytterbium oxide aerogels by supercritical drying. The nanoporous cubic Yb 2 O 3 networks with about 10 nm crystallite size is obtained by heat treatment of ytterbium oxide aerogels in air at 600 °C. The band gap and magnetic property of the nanoporous cubic Yb 2 O 3 networks are analyzed based on the band structure and density of states using first-principles calculation.
研究领域:
材料科学
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物理学
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2014
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IF 2.2
Zhenlong Zhang,Jichun Zhu,Shengjun Li,Yanli Mao
SrTiO 3 /Bi 2 O 3 heterojunction semiconductor was prepared and characterized by X-ray diffraction, UV–vis absorption spectrum , and scanning electron microscope, surface photovoltage spectroscopy, and photoluminescence spectroscopy. The surface photovoltage spectra indicate that the separation efficiency of photoinduced charges for SrTiO 3 /Bi 2 O 3 was enhanced compared with that of SrTiO 3 or Bi 2 O 3 . The energy band diagram of SrTiO 3 /Bi 2 O 3 heterojunction was directly determined with X-ray photoelectron spectroscopy, and the conduction band offset between SrTiO 3 and Bi 2 O 3 was quantified to be 0.28±0.03 eV. The photoluminescence spectra display that the recombination rate of photoinduced carriers for SrTiO 3 /Bi 2 O 3 decreases compared with that of SrTiO 3 or Bi 2 O 3 , which is mainly due to the energy levels matching between them. Therefore the enhanced separation efficiency of photoinduced charges is resulting from the energy difference between the conduction band edges of SrTiO 3 and Bi 2 O 3 .
研究领域:
材料科学
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光催化
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Huihui Zhang,Huajun Gu,Xiaohao Wang,Lingfeng Li,Juhua Zhang,Shengyuan Chang,Wei-Lin Dai
Enhancing the interfacial charge carriers transfer efficiency is important for designing photocatalysts with excellent hydrogen evolution performance. In this work, we have successfully constructed a In 2 O 3 @InN/ZnIn 2 S 4 ternary heterostructure by embedding InN at the interface of thin-layered ZnIn 2 S 4 and tubular In 2 O 3 derived from metal-organic frameworks (MOFs) nanorods for the first time. The InN can not only adjust the energy band structure of In 2 O 3 , but also boost the photogenerated charge carriers transfer at the interface of In 2 O 3 and ZnIn 2 S 4 . The optimum photocatalytic hydrogen evolution rate of In 2 O 3 @InN/ZnIn 2 S 4 composite reaches 275 µmol/h (50 mg of catalyst) under simulated sunlight irradiation, which is obviously higher than pure In 2 O 3 (12.5 times), ZnIn 2 S 4 (2.5 times) and binary In 2 O 3 /ZnIn 2 S 4 (1.8 times) photocatalysts. This work can offer a meaningful strategy to promote the interfacial charge separation in the heterostructure for excellent photocatalytic hydrogen evolution activity.
研究领域:
材料科学
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能源化学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Gaimei Gao,Guang Yang,Mingyu Dou,Shirong Kang,Xingliang Yin,Hua Yang,Wenning Yang,Dacheng Li,Jianmin Dou
The development of excellent photocatalysts for hydrogen evolution is of great significance to solving the global energy crisis. In this work, a novel 3D hierarchical CdS/NiAl-LDH photocatalyst was fabricated by a facile electrostatic assembly strategy, which was composed of 1D CdS nanorods and 3D flower-like NiAl-LDH microspheres . Under the visible irradiation, the CNA-20 hierarchical photocatalyst presents the optimum hydrogen evolution rate achieved to 3.24 mmol g −1 h −1 , which is improved 6.23-fold in comparison with the pure CdS. Through the analysis of energy band structures and first-principles calculation, the type-Ⅱ charge transfer mechanism was proposed. Driven by the built-in electric field, as well as the effect of intimate interface contact of CdS and NiAl-LDH, the photogenerated charge could be achieved rapidly separate and migrate, which effectively promotes the H 2 evolution. This well-designed synergistic 1D/3D interface interaction and provides an economic approach to rationally developing metal-free photocatalysts for hydrogen production .
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
POLYMER
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2023
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IF 4.6
Mengyu Xiao,Baoquan Wan,Xinmo Wang,Ming-Sheng Zheng,Yuchao Li,Yiyi Zhang,Jun-Wei Zha
Polyetherimide (PEI) for high-temperature energy storage still face the critical problem of low discharged energy density . The dramatic increase in leakage current is the basic reason for the deterioration of energy storage characteristics under elevated temperatures. Herein, a molecular engineering strategy is presented to suppress electrical conduction by introducing a high electron-affinity dianhydride structure into the main chain of PEI. The energy band structure of PEI is markedly affected by the dianhydride, which is illustrated by experimental research and density functional theory (DFT) calculations. Structures with high electron-affinity act as trap centers to capture carriers, significantly inhibiting conduction at elevated temperatures. Consequently, the PEI hybrid film exhibits a discharged energy density of 4.01 J/cm 3 and a charge-discharge efficiency of 91% at 150 °C. The high throughput and easy processing of the PEI hybrid film makes it a potential choice for energy storage under harsh conditions. This work represents a route for preparing polymer dielectrics with outstanding energy storage characteristics capable of operating in high temperature environments.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
npj Quantum Materials
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2023
·Vol. 8
·期 1
·1-7
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IF 5.7
Xu R. Z.,Du X.,Zhou J. S.,Gu X.,Zhang Q. Q.,Li Y. D.,Zhao W. X.,Zheng F. W.,Arita M.,Shimada K.,Kim T. K.,Cacho C.,Guo Y. F.,Liu Z. K.,Chen Y. L.,Yang L. X.
TaTe 4 , a metallic charge-density wave (CDW) material discovered decades ago, has attracted renewed attention due to its rich interesting properties, such as pressure-induced superconductivity and candidate nontrivial topological phase. Here, using high-resolution angle-resolved photoemission spectroscopy and ab initio calculation, we systematically investigate the electronic structure of TaTe 4 . At 26 K, we observe a CDW gap as large as 290 meV, which persists up to 500 K. The CDW-modulated band structure shows a complex reconstruction that closely correlates with the lattice distortion. Inside the CDW gap, there exist highly dispersive energy bands contributing to the remnant Fermi surface and metallic behavior in the CDW state. Interestingly, our ab initio calculation reveals that the large CDW gap mainly opens in the electronic states with out-of-plane orbital components, while the in-gap metallic states originate from in-plane orbitals, suggesting an orbital texture that couples with the CDW order. Our results shed light on the interplay between electron, lattice, and orbital in quasi-one-dimensional CDW materials.
研究领域:
凝聚态物理
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材料科学
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产品关联
DOI
高影响因子
Industrial Chemistry & Materials
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2025
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IF 11.9
Longlong Wang,Ruirui Wang,Shuang Wei,Kexin Li,Hasnain Nawaz,bin He,Mengyue Li,Ruixia Liu
Photothermal synergistic catalysis significantly enhances the efficiency of photocatalytic CO2 reduction, offering a promising strategy for accelerated CO2 resource utilization. Herein, a series of CuxInyS photocatalysts were synthesized, exhibiting tunable band gap energy by varying the Cu/In/S atomic ratios for photothermocatalytic CO2 conversion to C2H4. The typical CuInS2 demonstrates a more negative conduction band, significantly enhancing electron reduction ability and facilitating the multi-electron reduction of CO2 to C2H4. Additionally, the high sulfur vacancy in CuInS2 generates additional active sites, enhances charge separation efficiency, and consequently improves catalytic activity. The generation rate of ethylene reaches 45.7 μmol·g-1·h-1 with the selectivity of 79.7%. This study provides a new avenue for producing ethylene in photothermal catalysis, as well as highlights the superiorities of CuInS2 catalyst.
研究领域:
材料科学
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环境科学
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能源化学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Xin Xiao,Shunheng Tu,Mingli Lu,Huan Zhong,Chunxia Zheng,Xiaoxi Zuo,Junmin Nan
Up to now, the well-known mechanism on the photocatalytic degradation of contaminants is mainly based on the reactions derived from the photogenerated electron-hole pairs and their subsequent oxidizing species, and the degradation of organic dyes are especially focused. Whereas, it is rarely concerned the relationship of the oxidation ability of photocatalysts with the oxidative behaviors of contaminants. In this paper, a semiconductor photo-induced electrocatalysis model is proposed to clarify the photocatalytic mechanism by correlating the band structures of BiOI, Bi 4 O 5 I 2 , and Bi 4 O 5 Br 2 with their visible-light photocatalytic reactivity to phenol, bisphenol A, methylparaben, and propylparaben. It is revealed that the essential condition for degrading a certain contaminant is the valence band potential of photocatalyst is positive than the oxidation potential of contaminant. The valence band position of a photocatalyst can be determined by its optical absorption and electrochemical flat band potential measurement, and the oxidation potential of a contaminant can be measured by cyclic voltammetry technique. In particular, it is indicated that the oxidation potential of contaminants are generally correlated with their molecular orbital energy, which can be predicted by density functional theory (DFT) calculation. And the band positions of photocatalysts evaluated by an empirical equation based on the element electronegativity is in accordance with the actual band potentials. In addition, the bands composition calculated using DFT not only matches the experimental results but also provides the related information on the band structure with the chemical composition of catalysts. Thus, from the viewpoint of photo-induced electrocatalysis and with the help of experimental and theoretical analysis, the most photocatalytic reactions can be predicted and designed, which is universal for the environmental photocatalysis.
研究领域:
环境科学
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材料科学
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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
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IF 8.128
Lin Liu,Jiaqing Liu,Weijie Yang,Jun Wan,Feng Fu,Danjun Wang
Energy band structures greatly determine the charge separation and transfer properties in heterojunction photocatalysts and consequently their photocatalytic activities. Herein, a well-designed Z-scheme ZnIn 2 S 4 -S/CNTs/RP (ZIS-S/CNTs/RP) nanocomposite was fabricated according to an energy band alignment steering strategy to realize superior photocatalytic H 2 evolution performance. The ZIS-S/CNTs/RP nanocomposite shows an efficient photocatalytic H 2 evolution rate of 1639.9 μmol g -1 h −1 , which is noticeably higher than that of pristine red phosphorus (RP) and CNTs/RP and ZIS-S/RP composites, as well as those of the compared heterojunctions using bulk RP or ZnIn 2 S 4 . Owing to the modification of nanosized RP and the introduction of sulfur vacancies in ZnIn 2 S 4 , a tailored energy band alignment of the heterojunction with a higher reduction potential and larger Fermi level potential difference was achieved, which resulted in significantly increased photogenerated electron-hole separation efficiency and a more efficient Z-scheme charge transfer mechanism, thus promoting the photocatalytic activity of ZIS-S/CNTs/RP. This work aims to provide a novel effective strategy for the construction of high-performance heterojunction photocatalysts by energy band engineering.
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
APPLIED CATALYSIS A-GENERAL
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2023
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IF 5.5
Baiwei Ma,Fujia Hu,Xin Yang,Yongyu Huang,Xiubei Yang,Huijie Qiao,Zhuo Wang,Dehong Yang,Wenying Ai,Liwei Mi
Crystalline covalent organic frameworks (COFs) materials have good performance in photocatalytic conversions due to their excellent photoelectric properties in recent years. here, two new conjugated pyrene-based covalent organic frameworks (COFs), namely PyDF-COF and PyBMT-COF, were prepared through condensation polymerization of 4,4',4'',4'''-(pyrene-1,3,6,8-tetrayl)tetraaniline and 2,5-difluoroterephthalaldehyde or 2,5-bis(methylthio)terephthalaldehyde, respectively. Highly selective aerobic hydroxylation of arylboronic acids can occur smoothly with high yields and a wide range of substrate universality. Compared with PyDF-COF, PyBMT-COF demonstrates a more efficient ability for this aerobic hydroxylation, indicating electron-donating thiomethyl groups of PyBMT-COF are more favorable to enhance distribution of electron cloud than electron-withdrawing fluorine groups of PyDF-COF, which make the PyBMT-COF more easily afford holes and electrons (h + -e - ) separation, more effectively absorb visible light, and own narrower bandgap energy, higher photocurrent response, longer fluorescent lifetime and lower electrochemical impedance.
研究领域:
材料科学
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化学工程
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光电催化
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Mengjiao Yu,Weifan Shao,Guoyu Tai,Jiangang Han,Guangyu Wu,Weinan Xing
Despite challenges still remain, simultaneous regulation of light absorption, carrier separation and efficient exposed active sites of carbon nitride for the photocatalytic production of hydrogen (H 2 ) are essential to help alleviate the energy crisis and achieve carbon neutrality. Using in-plane phenyl groups doping and interlayer sulfate groups modification, we demonstrated an eco-friendly and facile method for excogitating porous tubular graphitic carbon nitride (PhSO-TCN2.5). The PhSO-TCN2.5 has hollow tubular morphology with ultrathin pore walls, which offers more exposed active sites, shortened charge diffusion path and readily available diffusion channels. More importantly, the in-plane phenyl groups doping and interlayer sulfate groups modification enabled significant intense the visible light absorption, accelerated carrier transfer due to the electron transport channel between the interlayers. Meanwhile, PhSO-TCN2.5 possesses exceptionally adjusted band gap structure and more negative conduction band potential. Accordingly, the above synergistic effects contribute to the efficient photocatalytic efficiency in H 2 evolution to 8709.29 μmol g −1 h −1 . In addition to the apparent quantum yield of 12.0% at 420 nm, that far exceeds the reported tubular and functional group-modified carbon nitride photocatalysts. This document offers guidance on designing and producing photocatalysts with high efficiency.
研究领域:
材料科学
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能源化学
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环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）