Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 3
·1678-1691
·
IF 11.301
Fang F. Wang,Chang D. Chen,Wei Wang,Ming L. Kang,Ying Gao,Xue B. Chen,Jing Zhang
Different from transition metals, Na ions cannot be incorporated in the WO3 lattice, but exist in the open framework formed by corner-sharing WO6 octahedra. Based on this channel-inserted Na-doping mechanism, herein, an in situ ion migration-based internal electric field (IEF) engineering strategy is developed. Firstly, Na channel-doped WO3 (Na/WO3) was prepared via a hydrothermal method. Driven by an increase in temperature, Na ions directionally migrated through channels towards the surface region of WO3, leading to an uneven charge distribution between the inner and outer side of the WO3 structure, together with the formation of a core–shell m-WO3/h-WO3 phase junction, and then the IEF from h-WO3 (+) to m-WO3 (−) was built. With a further increase in temperature, Na ions formed chemical bonds with O atoms belonging to the WO6 octahedra, forming a series of core/shell heterojunctions with consecutive –O–W–O– at the interface, including m-WO3/T-Na2W4O13 and m-WO3/T-Na5W14O44, which provide a pathway for the electron transfer. The distinct O 1s oxidation states between the two sides of the atomic junction interface were suggested to be the driving force for the formation of IEF in two heterojunctions. Electrons transfer to one side with a higher O 1s oxidation state along –O–W–O– bands at the interface to build IEF. Transient photocurrent measurement, photoluminescence spectroscopy, steady-state surface photovoltage spectroscopy (SS-SPV) and Mott–Schottky curves were used to investigate separation efficiencies of Na/WO3-T and the relationship with their relative IEF strength and activities. Results indicate that the synergistic effect of IEF and junctions is the main reason for the efficient carrier separation, finally resulting in improved photocatalytic oxygen evolution.
研究领域:
材料科学
·
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Chunxue Li,Yidong Zhao,Xiaoteng Liu,Pengwei Huo,Yongsheng Yan,Lili Wang,Guangfu Liao,Chunbo Liu
The design and development of high-performance photocatalysts from three aspects of simultaneous enhancement of light harvest, carrier migration rate, and redox reaction rate is still a great challenge. Herein, a novel Co 9 S 8 /CdIn 2 S 4 ohmic junction with a robust internal electric field (IEF) is successfully prepared via hydrothermal and in situ synthesis methods and is used for effective photocatalytic H 2 evolution (PHE). Under simulated visible light irradiation, the PHE rate of 5% Co 9 S 8 /CdIn 2 S 4 can reach 1083.6 μmol h −1 g −1 , which is 6.4 times higher than that of CdIn 2 S 4 (170.5 μmol h −1 g −1 ). The enhanced PHE performance is mainly ascribed to the improved light harvest and carrier separation efficiency and fast surface H 2 evolution kinetics. Moreover, Co 9 S 8 nanotubes serve as promising Co-based cocatalysts that can evidently enhance PHE activity. Additionally, Co 9 S 8 /CdIn 2 S 4 shows superior stability because the photogenerated carrier transfer path restrains the photocorrosion behavior. The photocatalytic mechanism is proposed based on experimental results and DFT calculations. This work offers new insights for the design and development of highly active photocatalysts from interface engineering.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Zhijie Zhang,Xuesheng Wang,Huiling Tang,Deben Li,Jiayue Xu
Modulating the internal electric field (IEF) represents a potential strategy to stimulate the photocatalytic activity of heterojunctions, especially S-scheme photocatalysts. Herein, a Cs 3 Bi 2 Br 9 @V O -In 2 O 3 (CBB@V O -In 2 O 3 ) S-scheme heterojunction, of which Cs 3 Bi 2 Br 9 perovskite quantum dots (PQDs) are embedded into mesoporous V O -In 2 O 3 hosts, is rationally designed as a cornerstone for further IEF manipulation. Briefly, by introducing oxygen vacancies (V O ) into the composed reduction semiconductor (mesoporous In 2 O 3 ), an enlarged Fermi level ( E F ) gap between CBB and V O -In 2 O 3 is achieved, yielding an intensified IEF over the CBB@V O -In 2 O 3 heterojunction. Such an enhanced IEF affords a much more robust driving force for directional carrier delivery, leading to accelerated carrier transfer of CBB@V O -In 2 O 3 heterojunction. Consequently, the optimized CBB@V O -In 2 O 3 heterojunction features desirable CO 2 -to-CO conversion efficiency, and its CO production rate reaches 130.96 μmol g −1 h −1 . The reaction intermediates and CO 2 photoconversion pathway were unraveled by in-situ diffuse reflectance infrared Fourier transform spectroscopy. Combining with the DFT calculation, it was revealed that oxygen vacancies in V O -In 2 O 3 act as reactive centers, which optimize the coordination modes of the intermediates, thus reducing the activation energy for photocatalytic CO 2 reduction. Our work demonstrates that the IEF modulation of S-scheme-based heterojunction could significantly boost the charge separation and then to drive efficient catalytic reaction , achieving high-efficiency solar fuel production.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Ernan Pang,Shijia Li,Jie Wu,Qing Chang,Ning Li,Shengliang Hu
Synchronously creating oxygen vacancies (OVs) and an internal electric field (IEF) in photocatalysts could be an ideal strategy to facilitate photogenerated charge separation and surface reactions but remain unexplored for this use. In this work, we report that low-cost and multifunctional CDs can involve in the nucleation reaction of copper vanadates (CuVs) to create OVs and proper IEF at the interface by modulating the valence states of coppers under hydrothermal conditions. Thus, CDs synergistically serve as oxygen vacancy inducer and charge separator in CuVs to extract photogenerated carriers to trigger persulfate (PS) activation for the degradation of tetracycline hydrochloride (TC). It turns out that CDs-modulated CuVs exhibit the expected photocatalytic capacity to activate PS in water and enable TC decomposition efficiency approximately 8 times higher than CDs-free CuVs under visible light irradiation. Our investigations elucidate that the oxidative breakdown of TC is dominated by the active species cooperation of 1 O 2 with h + and OH formed in photocatalytic reaction system.
研究领域:
环境科学
·
材料科学
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Horizons
·
2024
·
IF 12.2
Jianwei Yuan,Su Li,Zhaofei Dang,Sixia Liu,Fu Yang,Dongguang Wang,Hengcong Tao,Shuying Gao,Edison Huixiang Ang
Homojunction engineering holds promise for creating high-performance photocatalysts, yet significant challenges persist in establishing and modulating an effective junction interface. To tackle this, we designed and constructed a novel Janus homojunction photocatalyst by integrating two different forms of triazole-based carbon nitride (C3N5). In this design, super-sized, ultrathin nanosheets of carbon-rich C3N5 grow epitaxially on a nitrogen-rich honeycomb network of C3N5, creating a tightly bound and extensive interfacial contact area. This arrangement enhances the built-in internal electric field (IEF) between the two forms of C3N5, facilitating faster directional transfer of photogenerated electrons and improved visible-light harvesting. Consequently, Janus-C3N5 achieves a remarkable H2 evolution rate of 1712.4 μmol h−1 g−1 under simulated sunlight, which is approximately 5.58 times higher than that of bulk C3N5 (306.8 μmol h−1 g−1) and 14.1 times higher than another form of bulk C3N5 (121.2 μmol h−1 g−1). This work offers a new approach to design efficient homojunction-based photocatalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Haiping Li,Tingxia Hu,Renjie Zhang,Jianqiang Liu,Wanguo Hou
Up to now, studies on solid-state Z-scheme two-component heterojunctions have hardly referred to roles of interfacial internal electric fields (IEFs). Herein, solid-state Z-scheme Bi 2 MoO 6 /MO (M = Cu, Co 3/4 , or Ni) heterojunction photocatalysts were simply synthesized, for the first time, with enhanced photocatalytic performance toward organic degradation. Electron microscopy images reveal that the MO homogeneously distributes on surfaces of the Bi 2 MoO 6 hierarchical microspheres, and they close contact with distinct heterojunction interfaces. X-ray photoelectron spectra (XPS) suggest that the electron transfer occurs between the Bi 2 MoO 6 and MO after they contact, resulting in formation of IEFs at their interfaces. Based on band gap values and valance-band XPS and ultraviolet photoelectron spectra, energy band levels of the Bi 2 MoO 6 and MO are defined, and directions of the interfacial IEFs are determined. The IEFs play key roles for the formation of the Z-scheme Bi 2 MoO 6 /MO heterojunctions and for the photoactivity enhancement. This work provides a better insight into the formation mechanism of solid-state two-component Z-scheme heterojunctions and a significant experimental guidance for studying other similar systems.
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 ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Shikai Wang,Dong Zhang,Dafeng Zhang,Xipeng Pu,Junchang Liu,Hengshuai Li,Peiqing Cai
Reasonable design of high-performance catalysts with heterojunction to suppress the combination of electron-hole pairs has become an appealing challenge in photocatalytic field. Herein, a novel hydrangea-like ZnIn 2 S 4 /FePO 4 with S-scheme heterojunction was constructed via an ultrasound-annealing process for photocatalytic H 2 evolution. The composites showed remarkable photocatalytic H 2 production performance (3.337 mmol h −1 g −1 ), which was approximately 7.5 times higher than that of blank ZnIn 2 S 4 (0.446 mmol h −1 g −1 ). The improved photocatalytic H 2 evolution was mainly ascribed to the accelerated electron-hole separation through the construction of S-scheme heterojunction in interface. Moreover, the hydrangea-like structure provided abundant active sites and huge specific surface area, which was conducive to the exceptional photocatalytic activity. Simultaneously, both experimental and Density Functional Theoretical calculation results provided strong evidence for the transfer path of photogenerated carriers following the S-scheme heterojunction, and the unique mechanism of photocatalytic H 2 production was proposed. In addition, the hydrangea-like ZnIn 2 S 4 /FePO 4 heterojunction photocatalyst showed a commendable stability with no distinct decrease after three cycle tests, demonstrating its potential as a recoverable photocatalyst. This work offered insights into the design and preparation of highly efficient photocatalysts with S-scheme heterojunction.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Solar RRL
·
2023
·Vol. 7
·期 14
·2300259
·
IF 7.9
Lianqing Yu,Xiang Li,Lijie Duan,Yaping Zhang,Haifeng Zhu
Owing to great efficient routes for charge carrier separation and transfer, heterostructure photocatalysts play significant roles in many photocatalytic reactions. Based on the bionic structure, an interesting composite photocatalyst of cadmium sulfide dewdrops on ultrathin strontium titanate branches with oxygen vacancies is successfully constructed by a simple chemical bath deposition method. The oxygen vacancies act as electron traps in the dendritic perovskite SrTiO 3 nanostructure. Meanwhile, the CdS can provide abundant active sites for the hydrogen evolution reaction. The results demonstrate that SrTiO 3 /CdS-5% nanocomposite with oxygen vacancies achieves the highest hydrogen production rate of 4537.9 μmol g −1 h −1 under visible light, which is over 50 times more than that of the single SrTiO 3 with oxygen vacancies (79.36 μmol g −1 h −1 ), pure CdS (81.79 μmol g −1 h −1 ), and more than 750 times that of pure SrTiO 3 (6.132 μmol g −1 h −1 ). Density generalized function theory calculations show that the bandgap values of SrTiO 3 /CdS nanocomposite with oxygen vacancies are narrower than that of the original SrTiO 3 and CdS, in which the electrons flow from CdS to SrTiO 3 , and form an internal electric field at the interface, prolonging the carrier lifetime. Importantly, this work provides a reasonable reference for the preparation of efficient structure-based biomimetic composite photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Haomiao Cao,Zhaoyi Yin,Xiaoyi Dong,Yongjin Li,Yong Yang,Jianbei Qiu,Zhengwen Yang,Zhiguo Song
Exploring strategies to improve the near-infrared response of photocatalysts is an urgent challenge that can be overcome by utilizing upconversion (UC) luminescence to enhance photocatalysis. This paper reports the fabrication of a ZnO/Bi 3 Ti 2 O 8 F:Yb 3+ , Er 3+ (ZnO/BTOFYE) Z-scheme heterojunction based on a Bi 3 Ti 2 O 8 F:Yb 3+ , Er 3+ (BTOFYE) UC photocatalyst via electrostatic self-assembly. Fermi energy difference at the interface of BTOFYE and ZnO generates a strong internal electric field (IEF) in the Z-scheme heterojunction, offering a novel charge transfer mode that promotes carrier transfer and separation while retaining the strong redox capability. These results are confirmed through in situ X-ray photoelectron spectroscopy, in situ Kelvin probe force microscopy, electron spin resonance, and density functional theory calculations. In addition, the effect of the IEF on the UC luminescence process of Er 3+ enhances the luminescence intensity, considerably improving the UC utilization efficiency. The optimal ZnO/BTOFYE degrades 64 % of ciprofloxacin in 120 min, which is 2.3 times more than that degraded by BTOFYE. Overall, the results of this study offer a reference for the rational development of high efficiency UC photocatalysts by generating IEF in Z-scheme heterojunctions.
研究领域:
材料科学
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Kexin Wang,Zhongge Luo,Bin Xiao,Tong Zhou,Jianhong Zhao,Congcong Shen,Dequan Li,Zhishi Qiu,Jin Zhang,Tianwei He,Qingju Liu
TiO 2 photocatalysts are of great interest in the fields of environmental purification, new energy and so on, because of their non-toxicity, high stability, high redox ability and low cost. However, the photogenerated carriers are severely recombined, which limits the application of TiO 2 photocatalysts. Herein, S-scheme Cu 3 P/TiO 2 heterojunction composites were successfully synthesized by a simple and efficient microwave hydrothermal method, and the results show that the hydrogen production rate of Cu 3 P/TiO 2 is 5.83 mmol∙g −1 ∙h −1 under simulated sunlight irradiation, which is 7.3 and 83.3 times higher than that of pure TiO 2 and Cu 3 P, respectively. This excellent performance is derived from the internal electric field (IEF) and energy band bending generated by the S-scheme heterojunction formed between Cu 3 P and TiO 2 . The density functional theory (DFT) calculation indicates that the Cu 3 P possess smaller work function and more negative conduction band (CB) position than that of TiO 2 , which is very conducive to greatly improve the H + reduction ability and hydrogen production performance. This work provides a new idea for the reveal of electron transfer paths and active sites in S-scheme heterojunctions and deepens the mechanism understanding.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Hu Zhou,Miao Li,Liqin Chen,Huipeng Cheng,Dan Li,Changxin Tang,Jiren Yuan,Feigao Xu
In this work, Fe 3 O 4 /B 4 C (FeB) composites were successfully prepared by a facile co-precipitation process. FeB composites were characterized using XRD , FTIR, N 2 adsorption-desorption, XPS, etc techniques and then used as heterogeneous Fenton catalysts to activate green oxidant (H 2 O 2 ) for the degradation of TCH. The removal efficiency of TCH by FeB composites was explored including different parameters of Fe 3 O 4 loading on B 4 C, catalyst dosage, initial solution pH, H 2 O 2 dosage, and reaction temperature. The highest photo-Fenton catalytic efficiency was obtained for the composites with a mass ratio of Fe 3 O 4 to B 4 C of 1:0.75. At this time, the removal efficiency of Fe 3 O 4 /B 4 C was 2 times and 391 times that of the parent Fe 3 O 4 and B 4 C, respectively, and B 4 C can effectively improve the efficiency of the Fenton cycle. h + , e - , and ·OH were mainly responsible for the degradation of TCH by Fe 1 B 0.75 composites. After repeated use for five times, the removal efficiency of the catalyst was reduced by only 8.0%. The disparity in work functions by density functional theory calculations confirmed the formation of an internal electric field at the Fe 3 O 4 /B 4 C composites interface, which contributed the transfer of charge carriers between the Fe 3 O 4 and B 4 C. Moreover, the FeB composite showed a high stability, indicating that FeB composites may be a promising heterogeneous catalyst .
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yanli Sun,Xueliang Wang,Hooi Ling Lee
A simple and economical precipitation process was used to in situ synthesize a heterojunction of BiOBr(110)/BiOCl(110). Numerous techniques, such as SEM, XRD , HRTEM , BET, FTIR, and XPS , verified the successful creation of the heterostructure. In particular, the heterostructures exhibited significantly enhanced photocatalytic degradation efficiency towards ceftazidime (CFZ). The degradation kinetic constant of CFZ by BiOBr(110)/BiOCl(110) (5:5) was three times higher than those of BiOBr and BiOCl. Additionally, a type I heterojunction was reasonably suggested following UV–vis DRS and VB-XPS investigations. DFT calculations indicated that an internal electric field (IEF) was created when electrons (e - ) on the BiOBr surface were transferred to BiOCl in the dark. Upon visible light illuminated, photoinduced-e - was transferred from the conduction band (CB) of BiOCl to that of BiOBr under the action of IEF. In contrast, holes (h + ) moved in the opposite direction, realizing the separation of e - /h + pairs. Three degradation pathways were deduced based on intermediate products (IPs) detection by HPLC-MS. Importantly, the heterojunction catalyst exhibited efficient catalytic performance across solutions with different pH and maintained great reusability during four cycles of photodegradation . Overall, the work revealed distinctive insights concerning the mechanism of antibiotic degradation with BiOBr(110)/BiOCl(110) heterojunction structures .
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
危险品化学品经营许可证（带存储）