Inorganic Chemistry Frontiers
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2021
·Vol. 8
·期 7
·1686-1694
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IF 6.569
Jianlin Ren,Zhenglong Xia,Bifu Luo,Di Li,Weidong Shi
Accelerating light-induced carrier transfer and improving charge utilization are essential for enhancing the efficiency of solar hydrogen production. In this work, for the first time, 2D/2D covalent organic-framework (COF)/SnNb2O6 nanosheets were fabricated by a hydrothermal process. By adjusting the content of TpPa-2-COF, it was used to optimize the performance of solar hydrogen production. The optimal TpPa-2-COF/SnNb2O6 nanosheets show a hydrogen production rate of 7.66 μmol·h−1, which is 5.8-fold and 3.5-fold that of pristine SnNb2O6 and TpPa-2-COF, respectively. The significant improvement in the photocatalytic performance can be attributed to the formation of a 2D/2D heterojunction nanosheet with a good energy band position between TpPa-2-COF and SnNb2O6, which can efficaciously inhibit the restructuring of charge carriers. Through photoelectrochemical analysis, it is further proved that the interface interaction between TpPa-2-COF and SnNb2O6 can lead to effective charge separation. Moreover, the cycling experiments reveal that the as-prepared photocatalyst has excellent stability and recycling performance. This study shows that the smart integration of organic (COF) and inorganic materials into a heterojunction with a 2D/2D structure is an available tactic for the fabrication of efficient photocatalysts.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Taiping Hu,Kai Dai,Jinfeng Zhang,Shifu Chen
Step-scheme (S-scheme) photocatalytic system has been considered as an effective method for solar energy conversion by utilizing broadband solar energy, realizing easy separation of photoexcited carriers and strong redox ability. Herein, the novel ternary Ni 2 P cocatalysted two-dimensional (2D)/2D SnNb 2 O 6 /CdS-diethylenetriamine (SNO/CdS-D) system was designed and fabricated. The S-scheme SNO/CdS-D heterostructure gives photocatalytic hydrogen production of 7808 μmol g −1 h −1 , which is about 130.13 and 2.35 times stronger than that of SNO and CdS-D. Further, noble-metal-free Ni 2 P cocatalyst is decorated into SNO/CdS-D heterostructure, the photocatalytic hydrogen evolution performance could be enhanced to 11,992 μmol g −1 h −1 . Additionally, XPS analysis and DFT calculation revealed the carriers moves from CdS-D to SNO and then to Ni 2 P in the Ni 2 P-SNO/CdS-D nanocomposite. This work will give a reliable and clear insight into the interface and surface design of the 2D catalysts and offer a broadband photocatalytic hydrogen evolution process without noble metal cocatalysts.
研究领域:
材料科学
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能源化学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Runren Jiang,Guanghua Lu,Zhenhua Yan,Donghai Wu,Ranran Zhou,Xuhui Bao
The development of a novel Z-scheme system with a high separation efficiency of the charge carriers for remarkably enhanced photocatalytic activity is highly desirable. Herein, a carbon quantum dot-modified SnNb 2 O 6 /BiOCl (CQD-SNO/BOC) Z-scheme system, in which the CQDs acted as a bridge for the charge carriers, was successfully synthesized. As expected, the CQDs acted as a bridge for the charge carriers that could separate and accumulate electrons from SnNb 2 O 6 and holes from BiOCl by promoting the transfer of the photoinduced charge carriers, which enabled the BiOCl holes to maintain their high oxidation capability. Additionally, the CQDs not only endowed the SNO/BOC Z-scheme system with a large specific surface area that provided a greater number of active sites but also noticeably improved its visible light absorption capacity. Therefore, the CQD-SNO/BOC Z-scheme system showed an improved photocatalytic performance for the degradation of benzocaine (BC), which was over 20 times, 10 times and 2 times greater than those of BiOCl, SnNb 2 O 6 and SNO/BOC Z-scheme systems, respectively. In addition, the effects of catalyst concentration, pH value, different anions, and humic acid (HA) concentration on the photodegradation of BC were investigated in depth. Simultaneously, a four-stage pathway for the degradation of BC was proposed based on the degradation products that were identified, and the accuracy of this pathway was further verified based on biotoxicity assessments and toxicity predictions of the products. According to the ESR spectra and active species trapping experiments, a mechanism for the CQD-SNO/BOC Z-scheme system was proposed, in which the CQD bridge accelerated charge transfer. Based on these results, the CQD-modified Z-scheme system could be an efficient and promising photocatalyst for the degradation of PPCPs in water.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Runren Jiang,Guanghua Lu,Zhenhua Yan,Donghai Wu,Jianchao Liu,Xiadong Zhang
2D/2D materials have attracted extensive attention in the field of photocatalysis due to their large contact surfaces and short charge transfer distances. However, 2D/2D heterojunction materials, especially those that connect different materials together using strong chemical bonds, are still challenging to prepare. Herein, a novel hydrogen bond-assisted 2D/2D Z-scheme SnNb 2 O 6 /Bi 2 WO 6 system was successfully prepared using a facile hydrothermal method . The 2D/2D Z-scheme system increases the accessible area for charges and constructs interfacial electric fields, thereby reducing the barriers for electron transport and enhancing the photocatalytic activity . In addition, the electronic coupling of the surface hydrogen bonds can further enhance the interfacial electric fields, which offers a new route for lowering the interfacial potential barrier of the system. As expected, the hydrogen bond-assisted 2D/2D Z-scheme SnNb 2 O 6 /Bi 2 WO 6 system results in an outstanding improvement of the norfloxacin (NOR) photodegradation efficiency, and the degradation rate constant (4.06 × 10 −2 min −1 ) is 9 and 2 times higher than those of SnNb 2 O 6 (4.33 × 10 −3 min −1 ), and Bi 2 WO 6 (1.70 × 10 −2 min −1 ), respectively. Simultaneously, three differently degradation pathways for the degradation of NOR were proposed based on the degradation products that were identified. Finally, a fast charge transfer mechanism of the hydrogen bonds that are connected to the 2D/2D Z-scheme SnNb 2 O 6 /Bi 2 WO 6 system is proposed, which is based on the ESR analysis and the DFT calculations.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2022
·
IF 12.92
Hui Yang,Jin feng Zhang,Kai Dai
Achieving a strong redox ability and high visible-light absorption ability in a single semiconductor material is difficult. Designing a heterojunction between two semiconductor materials is a feasible method. The new step (S-scheme) heterojunction can effectively promote the separation and transfer of photogenerated electron-hole pairs and retain strong redox ability. We designed and prepared a CdSe 0.8 S 0.2 -diethylenetriamine (DETA)/SnNb 2 O 6 heterostructure material via the solvothermal method. When CdSe 0.8 S 0.2 -DETA and SnNb2O6 form an S-scheme heterojunction, 30%CdSe 0.8 S 0.2 -DETA/SnNb2O6 exhibits the highest CO production rate (17.31 μmol·g –1 ·h –1 ), which is factors of 2.8 and 4.8 higher than that of traditional solvothermal SnNb 2 O 6 (6.2 μmol·g –1 ·h –1 ) and CdSe 0.8 S 0.2 -DETA (3.6 μmol·g –1 ·h –1 ), respectively. X-ray photoelectron spectroscopy characterization data provided evidence that the transfer pathway of space charge in the CO 2 reduction process was in accordance with the S-scheme. This research provides a simple strategy through which one can optimize the band structure to promote the separation of photogenerated carriers and achieve a high efficiency of CO 2 reduction.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Shenghang Peng,Rong Li,Jing Li,Jian-Ping Zou,Alex Aziz,Xuxing Chen
Effective removal of ethylene (C 2 H 4 ) during fruit and vegetables storage and transport remains a critical challenge for post-harvest preservation. Although S-scheme heterojunctions can improve charge separation and redox capacity for ethylene degradation, their efficiency is still restricted by limited carrier transfer and sluggish oxygen activation. Here, we rationally designed a novel 2D/2D SnNb 2 O 6 /Bi 2 MoO 6 monolayer S-scheme heterojunction integrated with Pt co-catalyst to address these limitations. Density Functional Theory (DFT) calculations revealed the S-scheme charge transfer pathway, which was experimentally realized via electrostatic self-assembly followed by annealing-induced atomic interface bonding. Photodeposited Pt nanoparticles further promoted O 2 activation at reduction sites. The optimized Pt-50-SNOBMO achieved an outstanding visible-light-driven degradation rate (139.2 × 10 −3 min −1 ), 248.6 and 143.5 times higher than pristine SnNb 2 O 6 and Bi 2 MoO 6 , representing the best performance reported to date for ethylene removal. Extensive spectroscopic and microscopic analyses confirmed the robust interface interactions and S-scheme mechanism. This study provides new insights into heterojunction engineering and offers a promising strategy for advanced photocatalytic preservation technologies.
研究领域:
环境科学
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材料科学
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化学工程
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纳米技术
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采后保鲜技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
He Wang,Jie Yu,Xiaohui Zhan,Lei Chen,Yanping Sun,Huixiang Shi
The development of high-efficiency heterostructure photocatalysts is an attractive strategy for aquatic pollutants degradation. Herein, a novel 2D/2D Z-scheme heterojunction between SnNb 2 O 6 nanosheets and flower-shaped ZnO nanosheets was designed and fabricated through a simple two-step hydrothermal method. As expected, the obtained composite photocatalyst exhibits outstanding photodegradation efficiencies for RhB and phenol. The optimal reaction rate constant over 20%-SnNb 2 O 6 /ZnO heterostructure in RhB degradation is almost 15.03 and 3.95 times higher than pristine SnNb 2 O 6 and ZnO, respectively. Such an improved photocatalytic activity is mainly ascribed to the broader optical absorption and facilitated charge separation, which can be proved by various analytical methods. This designed composite also displayed excellent stability in four-cycle experiments. Additionally, a possible direct Z-scheme electron migration mechanism under an internal electric field was proposed with the aid of reactive species trapping experiments. This work provides a feasible strategy to obtain high-performance photocatalysts and might inspire a new perspective in the design of other 2D/2D Z-scheme heterojunctions for environmental purification.
研究领域:
环境科学
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材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Bifu Luo,Yuanzhi Hong,Di Li,Zhenyuan Fang,Yaping Jian,Weidong Shi
Two-dimensional (2D) nanosheet photocatalysts with appropriate band structure have aroused a great deal of research interest owing to their unique structural and electronic properties. In this work, carbon nitride quantum dots (CNQDs) with up-conversion property were constructed on SnNb2O6 ultrathin nanosheets by a facial hydrothermal process. The as-prepared CNQDs/SnNb2O6 0D/2D nanocomposites exhibited an enhanced photocatalytic performance of H2 production under visible light irradiation (λ > 420 nm). The up-conversion behavior of CNQDs endow the CNQDs/SnNb2O6 nanocomposites with the ability of photocatalytic H2 production at wavelengths greater than 600 nm. Moreover, the introduced CNQDs could serve as effective electron collectors and promote the transfer of photogenerated charge carriers, which is elucidated by the transient photocurrent response and electrochemical impendence spectra. Finally, a plausible photocatalytic mechanism was proposed for CNQDs/SnNb2O6 nanocomposite toward the H2 production from water splitting.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2020
·Vol. 40
·期 2
·425-432
·
IF 2.161
Huang Min,Liu Ji-Xin,Huang Peng,Hu Hai,Lai Chao
A two-dimensional (2D) SnNb 2 O 6 /amino-functionalized graphene (En-RGO) nanocomposite with a representative 2D–2D architecture has been constructed by an easy self-assembly approach and firstly investigated as anode materials for secondary sodium-ion batteries. The SnNb 2 O 6 nanosheets are evenly anchored with the amino-functionalized graphene through electrostatic attractive interplay between the negatively charged SnNb 2 O 6 and positively charged En-RGO after modification. As a result, a remarkable reversible capacity of 300 mAh·g −1 was obtained at 50 mA·g −1 , and significantly, the En-RGO electrode could also deliver ultra-long calendar life up to 1900 cycles with a high reversible capacity of 200 mAh·g −1 at current of 500 mA·g −1 . Such excellent electrochemical characteristics can be mainly ascribed to its fast pseudo-capacitive energy storage mechanism, and the capacitive contribution can even reach up to 90% at 1.2 mV·s −1 . Graphic abstract
研究领域:
材料科学
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电化学
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纳米科技
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能源存储
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无机化学
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功能材料
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电化学储能
✓ 已验证
DOI
高影响因子
Chemistry-An Asian Journal
·
2022
·Vol. 17
·期 12
·e202200288
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IF 4.839
Tao Liu,Xuemin Yin,Xiuping Yin,Shuling Cheng,Xuan Wang,Yufeng Zhao
Niobium-based oxides have attracted a lot of attention as anode materials for sodium-ion batteries (SIBs) due to their high theoretical specific capacity, excellent rate capability and exceptional safety. However, their poor intrinsic electronic conductivity and sluggish sodium ions diffusion kinetics severely hinder their practical applicability. Here, SnNb 2 O 6 @C was successfully prepared by a simple solid-state reaction technique coupled with carbon coating. HRTEM images show that the SnNb 2 O 6 @C particles are covered with uniformly ultrathin amorphous carbon layer of about 1.8 nm, thus improving the electronic conductivity and diffusion coefficient of sodium ions. As anode for SIBs, the as-obtained SnNb 2 O 6 @C material exhibits excellent specific capacity (369 mAh g −1 at a current density of 50 mA g −1 ) and remarkable rate performance (177 mAh g −1 at 1000 mA g −1 ), which indicates its good prospect in practical application.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）