JOURNAL OF SOLID STATE CHEMISTRY
·
2014
·
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
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Li Zou,Jiale Xie,Shuxiang Wang,Yixing Yu,Jing Huang,Liuliu Wang,Pingping Yang,Wenyan Tao
Low charge separation efficiency ( η sep ) of TiO 2 impedes its applications of photoelectrochemical (PEC) water splitting. A positive potential pretreatment approach has been developed to construct a surface polarization with −OH groups at a potential of 1.48 V RHE . When the pretreatment time of 6 h is used, the η sep and photocurrent density ( J ph ) reach up to 54% (vs. 24%, TiO 2 ) and 0.92 mA cm −2 (vs. 0.32 mA cm −2 , TiO 2 ) under AM 1.5 G illumination, respectively. The photovoltage can be increased from 0.17 V to 0.52 V. When the pretreatment time is extended to 22 h, a higher J ph of 1.57 mA cm −2 and η sep of 87% can be obtained. Furthermore, the positive potential pretreated TiO 2 possesses excellent PEC stability. The PEC improvements can be attributed to the surface polarization with the −OH groups and favorable surface states of Ti-OH, but not to the formation of Ti 3+ or oxygen vacancies.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Liao Yijun,Yulan Zhou,Side Fu,Huang Jiaxun,Wu Leyi,Xuejun Xu,Manfang Mai,Xinzhou Ma
BiVO 4 is one of the most promising photoanodes for photoelectrochemical water splitting but their performance is still limited by charge recombination and sluggish surface kinetics. To deal with these limitations, various Co:BiVO 4 /CoO x photoanodes were prepared in this work. Photocurrent density was increased by a factor of 2-3 by optimizing Co-doping. To find out the enhance mechanism, photoinduced absorption spectroscopy (PIAS) was employed to establish the relationship between photocurrent density and concentration of the photogenerated holes on surface. Meanwhile, intensity-modulated photocurrent spectroscopy (IMPS) was applied to measure the rate constant of charge transfer and surface recombination. The improved PEC performance was attributed to the synergy effect of Co-doping that increased the bulk charge separation efficiency and significantly suppressed surface recombination by two orders of magnitude at high potentials. More importantly, our investigation reveals that not all the surface holes could participate in water oxidation reaction and the utilization proportion of them was strongly dependent on Co-doping and potential. Not more than 12 % of the photogenerated holes were used for water oxidation on the pristine BiVO 4 surface over a wide potential range. In contrast, as high as 80 % of the photogenerated holes participated in water oxidation with the assistance of the CoO x nano-catalysts. It is the critical enhancement mechanism of the Co:BiVO 4 /CoO x photoanodes for photoelectrochemical water oxidation.
研究领域:
材料科学
·
能源科学
·
光催化
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Mao-Jin Ran,Meng Wang,Zhi-Yi Hu,Yi-Fu Huang,Lin-Dong Wang,Lu Wu,Man-Man Yuan,Jian Zhang,Bei Li,Gustaaf Van Tendeloo,Yu Li,Bao-Lian Su
Constructing heterojunctions have received significant attention in photocatalysis because of their efficient separation of photogenerated carriers and improving light utilization efficiency. Bimetallic sulfides (e.g. NiCo 2 S 4 ) are applied in electrocatalysis and supercapacitors that can be coupled with TiO 2 to form a heterojunction . Owing to the staggered energy band arrangement between TiO 2 and NiCo 2 S 4 , the establishing of a Z-scheme heterojunction between them is expected to enhance the carrier separation efficiency and reduce the sulfide photo-corrosion. However, the application of NiCo 2 S 4 in photocatalysis and studies on the mechanism of the TiO 2 /NiCo 2 S 4 Z-scheme heterojunction have seldom been reported. In this work, we obtained a hollow core-shell TiO 2 /NiCo 2 S 4 Z-scheme photocatalyst through a solvothermal method for photocatalytic hydrogen evolution (PHE). The PHE rate of the optimized TiO 2 /NiCo 2 S 4 -0.3 is 8.55 mmol g − 1 h − 1 , approximately 34 times higher than pure TiO 2 , 94 times higher than pure NiCo 2 S 4 . The remarkable photocatalytic activity can be ascribed to the hollow structure and the in-situ constructed Z-scheme heterojunction. The photogenerated charge transfer mechanism is revealed by hydroxyl radical trapping experiments and electron paramagnetic resonance (EPR) characterization. The in-situ construction of the Z-scheme heterojunction not only enhances the efficiency of separating the photogenerated carriers but also reduces the photo-corrosion of NiCo 2 S 4 . This study proposes an effective strategy for the design of TiO 2 -based Z-scheme heterojunctions and the application of NiCo 2 S 4 in photocatalysis .
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
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Linjuan Wang,Siva Krishna Karuturi,Ling Zan
We present one-pot hydrothemal syntheis of SnS 2 -In 2 S 3 p-n heterostructures for photocatalytic reduction of Cr 6+ to Cr 3+ . The conduction bands of In 2 S 3 and SnS 2 serve as the photogenerated electron donors and acceptors, respectively, forming a p-n junction band alignment improving the photogenerated charge separation efficiency. Through a detailed investigation of photocurrent spectra, photoluminescence spectra and electrochemical impedance, the heterojunction formation is shown to enhance the photogenerated charge separation and transport properties. In addition, the analysis of 5,5-Dimethyl-1-pyrroline N-oxide (DMPO) spin trapping electron spin resonance (ESR) spectra and band structure further testify the p-n junction of the composite catalyst that could accelerate the electron transport and change the pathway of photocatalytic process toward Cr 6+ reduction. Furthermore, SnS 2 -In 2 S 3 heterojunction photocatalyst achieved 3 times and 67 times higher efficiency than pure In 2 S 3 and SnS 2 photocatalysts under visible light toward Cr 6+ reduction. Moreover, the SnS 2 -In 2 S 3 p-n heterojunction photocatalyst demonstrates Cr 6+ removal in a weak alkaline solution, breaking through the challenge of Cr 6+ reduction in an alkaline environment.
研究领域:
材料科学
·
环境科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2019
·
IF 5.04
Meng-Jie Chang,Wen-Na Cui,Jun Liu,Kang Wang,Hui-Ling Du,Lei Qiu,Si-Meng Fan,Zhen-Min Luo
TiO 2 /Bi 4 Ti 3 O 12 hybrids have been widely prepared as promising photocatalysts for decomposing organic contaminations. However, the insufficient visible light absorption and low charge separation efficiency lead to their poor photocatalytic activity. Herein, a robust methodology to construct novel TiO 2 /Bi 4 Ti 3 O 12 /MoS 2 core/shell structures as visible light photocatalysts is presented. Homogeneous bismuth oxyiodide (BiOI) nanoplates were immobilized on electrospun TiO 2 nanofiber surface by successive ionic layer adsorption and reaction (SILAR) method. TiO 2 /Bi 4 Ti 3 O 12 core/shell nanofibers were conveniently prepared by partial conversion of TiO 2 to high crystallized Bi 4 Ti 3 O 12 shells through a solid-state reaction with BiOI nanoplates, which is accompanied with certain transition of TiO 2 from anatase to rutile phase. Afterwards, MoS 2 nanosheets with several layers thick were uniform decorated on the TiO 2 /Bi 4 Ti 3 O 12 fiber surface resulting in TiO 2 /Bi 4 Ti 3 O 12 /MoS 2 structures. Significant enhancement of visible light absorption and photo-generated charge separation of TiO 2 /Bi 4 Ti 3 O 12 were achieved by introduction of MoS 2 . As a result, the optimized TiO 2 /Bi 4 Ti 3 O 12 /MoS 2 -2 presents 60% improvement for photodegrading RhB after 120 min irradiation under visible light and 3 times higher of apparent reaction rate constant in compared with the TiO 2 /Bi 4 Ti 3 O 12 . This synthetic method can also be used to establish other photocatalysts simply at low cost, therefore, is suitable for practical applications.
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
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Haibo Li,Zujin Yang,Jingnan Zhang,Yongchao Huang,Hongbing Ji,Yexiang Tong
Semiconductor photocatalysis is a promising method to remove the harmful compounds into harmless molecules. Herein, In-doped BiOI (In-BiOI) photocatalysts with highly exposed dominant {001} facets were synthesized through a facile hydrothermal method. The XRD, SEM and TEM determinations revealed the high crystallinity structure of the samples, and the XPS results confirmed the doping of In. The In-BiOI nanosheets exhibited a higher activity in the photodegradation of p -chloroaniline (PCA) than that of pristine BiOI, among which the In-2 BiOI sample (feed mole ratio of In:Bi = 2%) possessed the best performance. Doping with In didn’t alter the structure, morphology, specific surface area or light absorption capacity of BiOI, but significantly improved its charge separation efficiency and transport capability, which were verified by the results of the lower PL emission, larger photocurrent intensity and smaller arc radius of EIS plots. More importantly, the mechanism of photocatalytic degradation is studied systematically, revealing that O 2− and h + were the major reactive species during the photodegradation process. Finally, the possible role of In-doping in enhancing the photocatalytic performance of BiOI is proposed.
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
RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·
IF 2.8
Yu Qingbo,Li Xianhua
The dicyandiamide/phthalic acid (DCDA/PA) precursor with molecular assembly strategy was prepared by hydrothermal treatment the mixture of dicyandiamine and phthalic acid, in which some of the amines were bound by phthalic acid through hydrogen bonding interactions, and the carbon nitride (CN) photocatalyst was further prepared by thermal polymerization. The results showed that the new chemical structure formed by the interaction of melamine cyanurate and phthalic acid through hydrogen bonding could hinder the intermolecular collision chances during the calcination process of DCDA/PA precursor, which made the polymerization reaction difficult to be carried out, and the CN photocatalysts with irregular layered stacking structure were formed. In addition, the presence of more amino groups in the CN-0.3 structure can effectively improve the separation efficiency of its photogenerated charge carriers, and after simulated visible light irradiation for 60 min, the photocatalytic activity presented by CN-0.3 for MB was 2.72 times higher than that of pristine g-C 3 N 4 .
研究领域:
材料科学
·
光催化领域
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 5
·504
·
IF 4
Xiyuan Gao,Pengnian Shan,Weilong Shi,Feng Guo
The development of photothermal-assisted photocatalytic systems with broad-spectrum solar utilization and high charge separation efficiency remains a critical challenge for antibiotic degradation. Herein, we report novel black g-C3N4(BCN) materials synthesized via a one-step thermal copolymerization strategy using C/N precursors and tetrachlorofluorescein. After the introduction of tetrachlorofluorescein, the color of the sample changes, which gives BCN enhanced light absorption and a significant photothermal effect for poorly heating-assisted photocatalysis. The synergistic coupling of photothermal and photocatalytic processes enabled the optimal BCN-U sample to achieve exceptional degradation efficiency (89% within 120 min) for a typical antibiotic (e.g., tetracycline) under an LED lamp as the visible light source, outperforming conventional yellow g-C3N4(YCN-U) by a factor of 1.37. Mechanistic studies revealed that the photothermal effect facilitates carrier separation via thermal-driven electron excitation while accelerating reactive oxygen species (•OH and •O2−) generation. The synergistic interplay between photocatalysis and photothermal effects, which improved mass transfer, ensures robust stability, which provides new insights into designing dual-functional carbon nitride-based materials for sustainable environmental remediation.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 19
·9444-9456
·
IF 6.97
Xinyi Lian,Zhou Chen,Xiang Yu,Tingting Fan,Yunyun Dong,Hesheng Zhai,Weiping Fang,Xiaodong Yi
To solve the intrinsic deficiency inherited from the large band gap of ZnSn(OH)6 (ZSH), a gradual sulfur doping strategy is first proposed here to expand the optical absorption range, improve the separation efficiency of photogenerated electron–hole pairs, and thus enhance the photocatalytic activity. It is demonstrated that the distribution of sulfur in the flower-like ZSH (the sulfur doped sample is denoted as S-ZSH) tends to be largest on the outer most surface and becomes smaller towards the interior. The S-ZSH therefore has a gradual bandgap structure that is beneficial for transferring photogenerated charge carriers from the interior to the surface, which will greatly enhance the utilization of photoelectrons. As a result, the visible light photocurrent density of S-ZSH and the photocatalytic degradation rate of rhodamine (RhB) are about 5 and 10 times higher than with pristine ZSH, respectively.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 36
·12694-12701
·
IF 4.099
Zhenchao Song,Qing Chang,Adrian Trinchi,Ning Li,Huiqi Wang,Jinlong Yang,Shengliang Hu
Hybrid nanostructures comprising disparate materials and having intricate shapes and facets are highly desired in photocatalytic applications requiring high selectivity. However, to produce such structures requires precise morphological control, and this is largely dictated by the stringent requirements of the reaction conditions, in addition to intricate, expensive, or tedious preparation steps. We present a simple, inexpensive, and scalable method for the preparation of hybrid nanostructures that combines carbon dots with hexagonal nanoplates of nickel-based compounds. The resultant heterostructure not only improves visible light absorption, but also exhibits enhanced photocatalytic activity for the reduction of 4-nitrophenol to 4-aminophenol when compared to carbon dots or hexagonal nanoplates of nickel-based compounds alone. The enhanced photocatalytic activity is due to the higher separation and transfer efficiency of photoexcited charge carriers at the interface between the carbon dot and hexagonal nanoplate of nickel-based compounds. This work opens up a straightforward and effective route to yield inexpensive and efficient photocatalysts for improved solar energy capture and conversion.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 27
·13412-13418
·
IF 9.931
Feng Li,Jing Li,Fengwang Li,Lili Gao,Xuefeng Long,Yiping Hu,Chenglong Wang,Shenqi Wei,Jun Jin,Jiantai Ma
The photoelectrochemical (PEC) water splitting performance of hematite-based photoanodes is still far from their theoretical value due to the ultrafast charge recombination in bulk and on the surface. In response, we developed a regrowth strategy to fabricate a photoanode with metallic Mg-doped α-Fe2O3 coating on nonmetallic P-doped α-Fe2O3 nanorods (Mg-Fe2O3/P-Fe2O3 NRs). This homojunction structure fulfils the requirements of both high charge separation efficiency and favorable band alignment, showing a high photocurrent density (4.7-fold higher than pristine Fe2O3) and low onset potential of 0.68 VRHE. Experimental and density functional theory (DFT) results reveal that the origin of such superior PEC performance is P-doping and Mg-Fe2O3 coating, which efficiently eliminate lattice mismatching, improve the conductivity of hematite, and simultaneously promote the photogenic carriers separation by the built-in electric field. This promising design may open an avenue to fabricating various efficient homojunction photoanodes for practical PEC water splitting.
研究领域:
材料科学
·
能源科学
·
化学
✓ 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）