COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Ruifeng Zhou,Jiaqi Zhao,Liang Chen,Jingyang Zhang,Zehui Fan,Chong Peng,Yun Li,Shuyi Yang,E Tao
ABSTRACT The intrinsic correlation between photo-induced extraction of hole and free radical reactions can facilitate the mineralization of contaminants via promoting the transfer of electrons from the semiconductor to the solution. TiO 2 /C/g-C 3 N 4 composite photocatalysts are prepared using thermal polycondensation and sol-gel methods in this paper. The introduction of carbon at the interface between the two phases creates charge migration channels that facilitate electron transfer at the interface of semiconductor catalyst as well as collisions of dissolved oxygen to the catalytic sites, which are able to promote catalytic oxidation reactions. Considering Rh-B as target, the removal rate is 97.2±0.2% within 90 min. The involvement of hydroxyl radicals and superoxide radicals is confirmed by carrying out radical quenching experiments and ESR characterization, suggesting that effective electron transfer synergistically promotes the production of hydroxyl radicals. Therefore, it emphasizes the importance of the indeterminate carbon bridged 2D/3D interface for constructing charge migration channels as well as promoting the efficiency of carrier separation in the process of photocatalytic efficient degradation of dyes.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Houde She,Ziwei Zhao,Wencai Bai,Jingwei Huang,Lei Wang,Qizhao Wang
Photocatalytic CO 2 reduction is considered as a feasible approach for solving greenhouse effect and energy shortage. Promoting electron migration and inhibiting electron-hole recombination are key challenges for efficient photocatalytic CO 2 reduction. Here, we successfully synthesized Cu:TiO 2 -CS composite as photocatalyst by a facile solvothermal method to improve the high-catalytic effect on CO 2 reduction. The as-prepared composite exhibits excellent photocatalytic CO 2 reduction performance under 300 W xenon lamp irradiation, with the yields of CO and CH 4 up to 4.48 μmol/g and 5.34 μmol/g, which is 10 times higher than that of TiO 2 . This impressive amelioration can be attributed to the synergy of organic polymer (chitosan) and inorganic material (Cu:TiO 2 ). This work may provide a constructing guidance in designing the composite photocatalyst concerning CO 2 photocatalytic reduction.
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
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Jiaojiao Fang,Jiaqi Li,Yukai Chen,Jiale Cheng,Chengyang Zhu,Junjie Mao
CO2-selective photoreduction to value-added products is ideal, but its practical application suffers from weak photogenerated carrier separation and insufficient multielectron transport. Herein, we constructed the tricomponent AuNPs@SnO2–AuNCs hybrid by decorating Au nanoclusters (AuNCs) on the Au nanoparticle (AuNPs)@SnO2 core–shell structure. AuNC–NP dual coupling endowed AuNPs@SnO2–AuNCs with an excellent CO yield of 64.8 μmol g–1 h–1 during CO2 photoreduction, which was higher than the role of separate application of AuNCs (25.3 μmol g–1 h–1) and AuNPs (16.0 μmol g–1 h–1). It was mainly attributed that the coaction of AuNPs and AuNCs not only enhanced the visible light absorption capacity but also improved the photogenerated carrier separation/migration. As a result, the electron-rich AuNCs induced from plasmonic AuNPs and photoexcited SnO2 promoted the photocatalytic CO2-to-CO performance. This work provides a new perspective to design multicomponent photocatalysts for highly efficient CO2 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
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Peng Wang,Enmin Hu,Linzhen Wu,Junhui He,Yihao Wang,Zhenhong Ou,Fan Yang,Tao Chen,Wenkun Zhu
Photo-assisted uranium extraction from seawater is regarded as a potential technique for uranium resource recovery. Here, we report a polymeric carbon nitride (SCN-C 3 N 4 ) synthesized via a one-step calcination method, which combines cyano groups (-C≡N) modification and S atoms doping for efficient uranium extraction. By DFT calculations, we confirm that the integration of -C≡N modification and S atoms doping effectively reconstructed the charge distribution on the inside of the heptazine rings, forming a strong driving force for the migration of photogenerated electrons to the reactive sites. Accordingly, the reaction rate constant of SCN-C 3 N 4 ( k = 0.00843 min −1 ) is 20.07 times higher than that of g-C 3 N 4 ( k = 0.00042 min −1 ). Finally, the SCN-C 3 N 4 exhibits a remarkable uranium extraction capacity of 6.05 mg g −1 in natural seawater. Relying on various spectroscopic techniques, we identify the reaction process of uranium, which is captured by -C≡N, forming UO 2.34 crystallization under the joint action of electrons and free radicals. Furthermore, SCN-C 3 N 4 demonstrates excellent antibacterial and corrosion resistance, breaking the bottleneck of uranium extraction from marine biofouling. This work provides an example of designing novel polymeric carbon nitride materials for uranium extraction.
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 INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Jing Xu,Zezhong Li,Zhenlu Liu,Shengming Xu,Xinyu Liu
A novel composite is constructed by loading ZIF-8 on Cu 2 O by in situ growth. By visible light driven semiconductor and π-π* conjugation effect of the metal–organic framework, the migration ability of photogenerated carriers is improved, and electrons are accumulated to participate in hydrogen ion reduction. The superior hydrogen evolution performance (981.8 μmol·g −1 ·h −1 ) and stability test indicate that the coupling of ZIF-8 and semiconductor Cu 2 O successfully improves the catalytic capacity of the material. Cu 2 O provides a place to stimulate activity for ZIF-8 with high specific surface area. The electron transfer mechanism in composites is studied by electrochemical and spectroscopy methods. This work also provides a new opportunity for the in-situ growth of metal–organic frame materials onto single-metal oxides.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Ruiting Li,Tengyang Gao,Yao Wang,Yan Chen,Wen Luo,Yang Wu,Yu Xie,Yong Wang,Yifan Zhang
The application of metal catalysis has gained prominence as a study area in recent years. In this work, we use adsorptive reduction and calcination to create Au–Pd alloy catalysts on COCN-2 with varying metal loadings. The plasma resonance effect of the alloys increases the photoresponse of the catalysts, and the engineering of nitrogen defects strengthens the strong bonds between Au–Pd alloy particles and carbon nitride graphite, optimizing the electronic structure, encouraging electron-directed migration, and increasing the efficiency of the reduction reaction. As a result, the efficiency of hydrogen generation by the Au–Pd 0.6 /COCN-2 catalyst is 5.089 mmol g −1 h −1 , which is 2367 times higher than that of the g-C 3 N 4 catalyst. Our findings highlight the crucial part that flaws play in strengthening the strong bonds that exist between the metal and the support, which enhances photocatalytic hydrogen generation. This work offers insightful information about creating effective photocatalysts.
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
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
·
2022
·Vol. 30
·期 1
·230-237
·
IF 2.509
Bin Du,Yuxiang Mai,Nanqing Chen,Yushun Zhao
The interfacial effect of nanoparticles can effectively regulate electron migration in epoxy composites. In this article, hydroxylated C60 [C60(OH)] was prepared and added to epoxy resin (EP). The inhibition of electron motion in epoxy composites was realized, and the dielectric strength of the epoxy composites was improved. The results of dynamic mechanical analysis (DMA) showed that C60(OH) regulated the structure of the crosslinked EP network and increased the crosslink density by 16.5%. The results of a density functional theory (DFT) simulation showed that the doping of C60(OH) formed a potential energy barrier at the C60(OH)-EP interface, which was conducive to the directional migration and capture of electrons driven to C60(OH). Electrostatic force microscopy (EFM) and pulsed electroacoustic (PEA) experiments showed that C60(OH) had a strong ability to capture charge, and the charge migration rate of C60(OH)/EP was 43% lower than that of pure EP in the presence of 10 kV/mm when the EP was doped with 0.1wt% C60(OH). The breakdown strength and volume resistivity increased by 17.87% and 222%, respectively. Thus, this article provides a new method to improve the dielectric strength of epoxy composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 7
·5954-5960
·
IF 2.324
Wang Yan,Wang Yishu,Han Jing,Tan Shihai,Guo Fu
Sn grain orientation in solder matrix has recently been considered as one of the principal failure contributions in lead-free solder joints. Since β -Sn exhibits high anisotropy, the differences of electromigration behavior of solder joints with various grain orientations are dramatic. With different angle ( θ ) between the c -axis of Sn grain and the direction of electron flow, the solder joints often demonstrate varying degrees of electromigration-induced damage. The present investigation illustrated significant differences in microstructural features on the surface of Cu reinforced composite solder joints, even with similar angle θ . Two Cu particles reinforced Sn 3.5 Ag composite solder joints with the similar angle θ of 35° and 40° were selected to investigate the effects of Sn grain c -axis on electromigration under high current stressing for 528 h. A large number of Cu 6 Sn 5 compounds were observed and occupied nearly the whole surface with clear polarization effect in one sample. In contrast, very few Cu 6 Sn 5 were found on the surface of the solder matrix in the other sample after current stressing, and the Cu 6 Sn 5 which was formed after reflow disappeared with subsequent current stressing. Even though polarization effect was not obvious, and the cathode interfacial dissolution was observed on such sample. Systematic study revealed that the angle θ alone was not a sole factor to determine the electromigration damage. It has to be considered along with the coordinate system containing the orientation of the c -axis of the Sn grain, a more dominative factor for the diffusing species.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Jie Xu,Xiaowei Liu,Rui Li,Boxiong Shen,Zijian Zhou,Lidan Deng,Lei Liu,Xinbo Zhu
Converting CO 2 into renewable fuel via photocatalysis is of significance to solving the energy crisis and climate change. However, the limited electron transfer in single catalysts always limits the reduction reaction. In this work, a p-n heterojunction was constructed between Cr doped MgAl–LDH (abbreviated as LDH) and Co 3 O 4 for visible-light-driven fuel production. Since LDH and Co 3 O 4 both have the sufficient potentials to drive CO 2 photoreduction, the constructed type-II heterojunction is more favorable for electron utilization efficiency. The optimal Co 3 O 4 /LDH heterojunction exhibited the highest CO evolution rate of 7.42 μmol•g −1 •h −1 and a CO selectivity of 90.5% with TEOA as sacrificial agent . The further characterizations highlight that the addition of Co 3 O 4 greatly improves the light absorption and the heterojunction effectively promotes the reverse migration of electrons and holes. This work investigates and verifies the designed type-II heterojunction based on MgAl–LDH, which has the guidance for the design of heterojunction catalysts and promotes the practical application of MgAl–LDH in photocatalytic region.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Qingjie Luan,Xiangdong Xue,Hongtai Feng,Lu Tao,Dongxue Zhou,Tengfei Chen,Mengxi Tan,Wenjun Dong
Molecular-type cocatalysts can achieve the maximum electron transfer and minimum light absorption loss by virtue of their size advantage. Herein, a novel hydrophilic molecule-semiconductor hybrid P 4 @Vs-ZnIn 2 S 4−x photocatalyst was successfully developed by in-situ P 4 molecular anchoring on S defect ZnIn 2 S 4−x (V S -ZnIn 2 S 4−x ). The electron-rich P 4 molecules are anchored on the Zn-S 4 surface through S vacancies, forming Zn-P and S-P bonds that can promote electron injection from the electron-rich P 4 molecular to Vs-ZnIn 2 S 4−x substrate and reduce the adsorption/desorption barrier of H intermediate on S atom of Zn-S 4 plane. Meanwhile, the electrostatic potential depression around P 4 promoted the directional migration of in-plane photogenerated electrons, and pooled electrons to the highly active P sites and S sites, thereby accelerating the kinetics of hydrogen evolution. As a result, P 4 @Vs-ZnIn 2 S 4−x achieves an optimal photocatalytic hydrogen evolution activity of 26.1 mmol g −1 h −1 under visible light, which is 6.2 times higher than 4.2 mmol g −1 h −1 for Vs-ZnIn 2 S 4−x .
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xinying Ding,Yuanbin Wen,Chen Qing,Yaru Wei,Pengcheng Wang,Jingyi Liu,Zhanhong Peng,Yihui Song,Houyang Chen,Qian Rong
δ-MnO 2 was proposed as a promising cathode material for aqueous Zn-ion batteries. Nonetheless, its potential application has been impeded by its unstable crystal structure and sluggish reaction kinetics with Zn ions. Herein, we utilized Cr to modify δ-MnO 2 by a simple hydrothermal method to develop cathode materials for aqueous Zn-ion batteries with better stability and electron transport properties. The introduction of Cr enhanced the specific capacity and cycling stability of δ-MnO 2 , in particular, the 3% Cr doped δ-MnO 2 electrode exhibited a large specific capacity of 229.2 mAh·g −1 at 0.1 A·g −1 and an excellent capacitance retention of 86.0% after performing 300 cycles. The density functional theory (DFT) calculations indicate that the introduction of Cr decreases the band gap of MnO 2 and enhances electron migration in the electrode material. Meanwhile, the introduction of Cr substantially improved the Zn ion adsorption and enhanced the binding energy of δ-MnO 2 , indicating that the addition of Cr promoted the interaction between the Cr doping δ-MnO 2 (Cr-MnO 2 ) electrode materials with Zn ions, while making the structure of the electrode materials more stable. As a result, this suppresses the Jahn-Teller distortion and reduces the solvation and phase transition of Mn.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xunhuai Huang,Guanyu Wu,Yanhua Song,Tianqi Wu,Peipei Sun,Xianglin Zhu,Jing Wang,Xuefeng Yin,Zhao Mo
The photocatalytic hydrogen (H 2 ) evolution reaction driven by solar energy is one of the most promising methods to alleviate energy and environmental problems. Regrettably, the rapid recombination of photogenerated electrons and hole pairs in semiconductor catalysts leads to low solar energy conversion efficiency. To address this problem, we chose the method of co-catalyst loading. This study uses an in-situ self-assembly growth strategy to load high-valent cobalt sulfide (CoS) onto bulk carbon nitride (BCN) for photocatalytic H 2 evolution. The results show that the photocatalytic H 2 evolution performance of the optimal ratio of CoS and BCN composite (CoS-BCN(15%)) is 156 times that of BCN. The main reason for the performance improvement is that CoS nanoparticles act as co-catalysts to increase the carrier migration rate. Moreover, CoS nanoparticles contain mixed-valence Co 3+ /Co 2+ . During the reaction, high-valence cobalt ions become electron transfer stations, reacting with additional electrons to generate low-valence ions, reducing the recombination of carriers. Additionally, combined experiments and theoretical calculations show that the CoS surface is more conducive to the precipitation of H 2 than BCN. This study provides a reference for further exploring the mechanism of action of co-catalysts.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）