ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Dongxu Zhang,Weixuan Dong,Yanhong Liu,Xiaoqing Gu,Tianyu Yang,Qiang Hong,Di Li,Dongqi Zhang,Hongbo Zhou,Hui Huang,Baodong Mao,Zhenhui Kang,Weidong Shi
Photoassisted electrocatalysis (P-EC) emerges as a rising star for hydrogen production by embedding photoactive species in electrocatalysts, for which the interfacial structure design and charge transfer kinetics of the multifunctional catalysts remain a great challenge. Herein, Zn-AgIn5S8 quantum dots (ZAIS QDs) were embedded into 2D NiFe layered double hydroxide nanosheets through a simple hydrothermal treatment to form 0D/2D composite catalysts for P-EC. With evidence from transient photovoltage spectroscopy, we acquired a clear and fundamental understanding on the kinetics of charge extraction time and extraction amount in the 0D/2D heterojunctions that was proved to play a key role in P-EC. Upon light illumination, for HER, the optimized NiFe-ZAIS exhibits obviously reduced overpotentials of 129 and 242 mV at current densities of 10 and 50 mA cm–2, which are 22 and 33 mV lower than those of dark electrocatalysis, respectively. For OER, the NiFe-ZAIS electrode also shows low overpotentials of 220 and 268 mV at current densities of 10 and 50 mA cm–2, respectively, under light illumination, which were able to almost double the intrinsic activity. Finally, with NF@NiFe-ZAIS as both the cathode and the anode, the assembled electrolyzer only requires 1.62 V to reach the overall water splitting current density of 10 mA cm–2 under P-EC. This work provides a useful example for the profound understanding of the design and the kinetics study of multifunctional P-EC catalysts.
研究领域:
材料科学
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电化学
·
能源转换与存储
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Yali Song,Shanshan Gao,Jiayu Tian,Hongzhong Zhang
To ensure efficient removal of SIX, Ag/g-C 3 N 4 with uniform-sized Ag nanoparticles was synthesized. With the employment of poly vinylpyrrolidone in synthesis process, Ag sizes were controlled and the photoabsorption ability of Ag/g-C 3 N 4 for visible-light was improved. In comparison with g-C 3 N 4, the degradation kinetic constant of SIX was increased by 1.75 times when Ag content was optimized (5 wt.% in this work, i.e. Ag/g-C 3 N 4 -5). The primary species for SIX degradation by Ag/g-C 3 N 4 -5 were holes and ·O 2 − in the presence of visible radiation. Besides, the intermediate products generated in reaction processes were identified and the transformed pathways were proposed in photocatalytic process of SIX by Ag/g-C 3 N 4 -5, including the rupture of the chemical bond between S and benzene ring, the rupture of S N bond, the hydroxylation and nitration of benzene ring. Finally, the photocatalytic degradation of SIX in two authentic water bodies revealed the efficient removal of SIX can still be realized by Ag/g-C 3 N 4 -5.
研究领域:
环境科学
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材料科学
·
光催化技术
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 42
·期 1
·265-271
·
IF 3.269
Xiao-Bo Xiang,Yang Yu,Wei Wen,Jin-Ming Wu
Noble metal loading and semiconductor compositing are two effective techniques to improve the photocatalytic activity of semiconductor photocatalysts. These two tactics are combined herein to achieve hierarchical Ag@TiO2@ZnO nanowires, which consist of ZnO nanorods growing radially from Ag nanowires with the help of a compact TiO2 intermediate layer. The Ag@TiO2@ZnO nanowires consisted of 4.3 wt% Ag, 16.7 wt% TiO2 and 79.0 wt% ZnO. When utilized to assist photodegradation of phenol in water under UV light illumination, the nanowires exhibited a reaction rate constant 1.8 times that of commercial Degussa P25 TiO2 nanoparticles and 3.8 times that of commercial ZnO nanoparticles. The excellent photocatalytic activity can be contributed to the enhanced light adsorption and charge separations arising from both Ag/TiO2 Schottky barriers and TiO2/ZnO heterojunctions.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 2
·878-883
·
IF 3.049
Fangke Zhan,Ran Wang,Juanjuan Yin,Zengsheng Han,Lun Zhang,Tifeng Jiao,Jingxin Zhou,Lexin Zhang,Qiuming Peng
Functional nanocomposites demonstrate excellent comprehensive properties and outstanding characteristics for numerous applications. Magnetic nanocomposites are an important type of composite materials, due to their applications in optics, medicine and catalysis. In this report, a new Fe3O4-loaded silver (Fe3O4–Ag) nanocomposite has been successfully synthesized via a simple solvothermal method and in situ growth of silver nanowires. The silver nanowires were prepared via the reduction of silver vanadate with the addition of uniformly dispersed Fe3O4 nanoparticles. Structural and morphological characterizations of the obtained Fe3O4–Ag nanocomposite were carried out using many characterization methods. As a new composite catalyst, the synthesized magnetic Fe3O4–Ag nanocomposite displayed a high utilization rate of catalytically active sites in catalytic reaction medium and showed good separation and recovery using an external magnetic field. The facile preparation and good catalytic performance of this Fe3O4–Ag nanocomposite material demonstrate its potential applications in catalytic treatment and composite materials.
研究领域:
材料科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Wenhui Wang,Ting He,Xuehua Liu,Weina He,Hengjiang Cong,Yangbin Shen,Liuming Yan,Xuetong Zhang,Jinping Zhang,Xiaochun Zhou
Hydrogen is regarded as a future sustainable and clean energy carrier. Formic acid is a safe and sustainable hydrogen storage medium with many advantages, including high hydrogen content, nontoxicity, and low cost. In this work, a series of highly active catalysts for hydrogen production from formic acid are successfully synthesized by controllably depositing Pd onto Ag nanoplates with different Ag nanofacets, such as Ag{111}, Ag{100}, and the nanofacet on hexagonal close packing Ag crystal (Ag{hcp}). Then, the Pd–Ag nanoplate catalysts are supported on Vulcan XC-72 carbon black to prevent the aggregation of the catalysts. The research reveals that the high activity is attributed to the formation of Pd–Ag alloy nanofacets, such as Pd–Ag{111}, Pd–Ag{100}, and Pd–Ag{hcp}. The activity order of these Pd-decorated Ag nanofacets is Pd–Ag{hcp} > Pd–Ag{111} > Pd–Ag{100}. Particularly, the activity of Pd–Ag{hcp} is up to an extremely high value, i.e., TOF{hcp} = 19 000 ± 1630 h–1 at 90 °C (lower limit value), which is more than 800 times higher than our previous quasi-spherical Pd–Ag alloy nanocatalyst. The initial activity of Pd–Ag{hcp} even reaches (3.13 ± 0.19) × 106 h–1 at 90 °C. This research not only presents highly active catalysts for hydrogen generation but also shows that the facet on the hcp Ag crystal can act as a potentially highly active catalyst.
研究领域:
催化化学
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材料科学
·
能源化学
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DOI
高影响因子
Materials Research Express
·
2017
·Vol. 4
·期 1
·015603
·
IF 1.068
Bo Yu,Yongkun Liu,Guohua Jiang,Depeng Liu,Weijiang Yu,Hua Chen,Lei Li,Qin Huang
In this paper, the electrospun Ag nanoparticles and g-C3N4 (Ag/g-C3N4) loaded composite carbon nanofibers were successfully prepared combing the electrospinning technology and carbonization treatment. The composition and microstructure of the resultant composite nanofibers were characterized by x-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive spectrometer (EDS), transmission electron microscopy (TEM) and x-ray photoelectron spectrometry (XPS). Due to the synergistic effect between catalytic activity of Ag nanoparticles (NPs) and g-C3N4 and excellent adsorption capacity of carbon nanofibers, the resultant electrospun Ag/g-C3N4 loaded composite carbon nanofibers exhibited excellent conversion of 4-nitrophenol to 4-aminophenol and benzylamine to N-benzylbenzaldimine. The resultant hybrid carbon composite nanofibers offer the significant advantages, such as low dosage, high catalytic activity, easy recycling and excellent stability.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-13
·
IF 5.3
Bi Leyao,Fu Boyan,Lin Jiahui,Wen Junsheng,Fu Jiaxing,Zou Binglin,Su Ningning,Wang Chunjie,Wang Yue
Ag-modified ZnO coral-like nanosheets were synthesized for the first time using a simple hydrothermal method. Compared to other Ag-modified ZnO sensors, the sensor with 2 wt% Ag content demonstrates excellent ethanol-sensing performance. The maximum response value of 67.42 can be achieved at the optimal operating temperature of 260 °C for 100 ppm ethanol gas, with corresponding response/recovery time of 6/75 s, respectively. This sensor also exhibits superior selectivity, reproducibility, and long-term stability. Techniques such as XRD, XPS, SEM, and TEM were employed to characterize the physicochemical properties of the gas-sensitive materials. Further research indicates that the enhanced gas-sensing properties of the composite materials can be mainly attributed to the unique coral-like nanosheet structure, the relatively high-specific surface area (9.8706 m 2 /g), and the combined effects of the Ag-ZnO heterostructure, as well as the synergistic interplay of electronic sensitization and spillover effects. This research offers valuable insights into the modification of ZnO-based gas-sensing materials with noble metals. Graphical
研究领域:
材料科学
·
传感器技术
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DOI
PubMed
高影响因子
IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Jingxuan Wu,Yu Wan,Zhenxing Wang,Yimu Wang,Qingsong Luo,Changhao Feng,Tatsuo Yoshinobu
The efficient and reliable monitoring of acetic acid (CH3COOH) is significant to environmental protection and human healthcare. LaFeO3 is a potential sensing material for CH3COOH with its good sensitivity and high plasticity. To further improve the sensing properties of LaFeO3 to meet the requirements of applications, we successfully utilized the facile electrospinning technique to fabricate a series of CH3COOH-sensitive Ag-doped (0–5 mol%) LaFeO3 nanotubes. The systematic characterization shows that the appropriate content (4 mol%) of Ag doping can effectively ameliorate the material morphology to realize loose porous structures. Meanwhile, the sensitization effect of Ag and ameliorated morphology significantly enhance the gas-sensing properties of LaFeO3 to CH3COOH vapor. The optimal Ag-doped LaFeO3 (4 mol%) loose nanotubes-based gas sensor results in a detection limit of 0.5 ppm and 3.6-fold enhancement of the response to 100-ppm CH3COOH compared with the pure LaFeO3 compact nanotubes at a low operating temperature (150 °C). It also exhibits excellent selectivity to CH3COOH and good long-term stability. Therefore, Ag-doped LaFeO3 can be regarded as a promising material for sensing CH3COOH in practical applications. Finally, the mechanism of enhanced gas-sensing properties is discussed.
研究领域:
材料科学
·
环境科学
·
传感器技术
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·Vol. 51
·期 4
·2071-2088
·
IF 3.5
Wu Yilin,Li Yiping,Zhang Kai,Hu Jinhai,Yan Hong
Photocatalytic CO 2 reduction technology can use sunlight to convert CO 2 into fuel or chemical raw materials, slowdown the greenhouse effect and achieve sustainable development. Therefore, we have developed a series of high-quality carbon quantum dots using alkaline lignin (AL) as the core raw material and using high efficiency hydrothermal method. Ag-BiVO 4 composite was prepared by hydrothermal method. Then, the Ag-BiVO 4 -CQDs photocatalytic composite was prepared by constant temperature water bath method. The structure and morphology of the composites were characterized by X-ray diffraction, transmission electron microscope and X-ray photoelectron spectroscopy. Through optical and electrochemical tests, it can be seen that the composite has better interfacial charge transfer and electron transport ability. In the visible light catalytic CO 2 reduction reaction, Ag-BiVO 4 can selectively reduce CO 2 to CH 4 , and the CH 4 yield is greatly improved after Ag-BiVO 4 combines with CQDs. The 3 h CH 4 yield increased from 17.64 μmol/g to 97.82 μmol/g after reduction by adding 40 mL CQDs to Ag-BiVO 4 composite, which is 5.54 times that of Ag-BiVO 4 . The results showed that the introduced CQDs were uniformly attached to Ag-BiVO 4 . As an electron transport medium, CQDs can efficiently facilitate the transfer of photogenerated carriers, suppress the recombination of electron–hole pairs, and enhance the photocatalytic performance of Ag-BiVO 4 -CQDs for CO 2 reduction.
研究领域:
材料科学
·
环境科学
·
化学
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产品关联
DOI
高影响因子
PHYSICA SCRIPTA
·
2024
·Vol. 99
·期 11
·115918
·
IF 2.6
Shengkai Liu,Cheng Chang,Boyu Chen,Han Song,Jiashen Fan,Yujie Fu,Zhiguo Liu
In this study, catechin-functionalized Fe3O4-Ag nanocomposites were synthesized by a hydrothermal method. The motivation for this study was to develop a novel antibacterial agent with enhanced stability and biocompatibility. The objective was to create a nanocomposite combining the antimicrobial properties of silver with the antioxidant and bioactive characteristics of catechin. We hypothesized that the synergistic effect of catechin and Fe3O4-Ag would yield a highly effective antibacterial material against common pathogens. The obtained nanocomposites were characterized by TEM, SEM, AFM, XPS, XRD, FTIR and physical property measurement system (PPMS). TEM images indicated that catechin-functionalized Fe3O4-Ag nanocomposites have a spherical morphology with an average size of 25.7 nm. The SEM and AFM imaging revealed that the nanocomposites appear as a number of large particles with average diameter of 581 nm. XPS and XRD and FTIR measurement confirmed the presence of catechin components, Fe3O4 and Ag in the nanocomposites. Taken together, we conclude that the catechin-Fe3O4-Ag nanocomposites in this study have a jujube cake structure in which the Fe3O4-Ag alloy nanoparticles serve as the jujube and the condensed catechin form into the cake substrate. The antimicrobial test indicated the catechin-functionalized Fe3O4-Ag nanocomposites have obvious inhibitory effects on E.coli, S.aureus, and C.albicans.
研究领域:
纳米生物学
·
材料科学
·
微生物学
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产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Zhang Siyang,Khan Iltaf,Qin Xiaohong,Qi Kezhen,Liu Ying,Bai Shuchong
In this work, the highly efficient and low-cost Ag-AgBr/AlOOH plasmonic photocatalyst is successfully prepared via a simple and mild wet-chemical process and used for degrading high concentration methylene blue (MB) and tetracycline hydrochloride (TCH). The optimized 6-Ag-AgBr/AlOOH sample showed a 79% decomposition of TCH in 2 h, which is almost two times higher than that of bare AgBr (37%). For degrading MB, the photocatalytic activity of 6-Ag-AgBr/AlOOH (decomposing 84% in 2 h) showed a large enhancement as compared to bare AgBr (only 57%). The TEM, HRTEM, XRD, DRS, and XPS characterization results confirm that Ag-AgBr is a composite catalyst formed by loading Ag nanoparticles onto AgBr surfaces and then loaded on to AlOOH. The possible mechanism proposed is that •O2- and •OH radicals produced under sun light are the main active species for degrading MB and TCH. It is hoped that this work will open a new gateway to the synthesis of highly efficient and low-cost Ag-AgBr/AlOOH plasmonic photocatalysts for degrading organic pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 49
·期 1
·101-119
·
IF 3.134
Chen Fenghua,Yang Maosen,Shi Xiangdong,Qin Xiaoyun,Chen Qingtao,Jiang Liying,Jia Chunxiao
In order to increase the photocatalytic performance of titanium dioxide mesocrystals (TMCs), in this study, Ag nanoparticles with different mass content were first photodeposited on the surface of as-prepared TMCs to form heterostructured Ag–TMCs catalysts, followed by loading them on g-C 3 N 4 via one step “bottom-to-up” calcination method. The results of photocatalytic degradation toward RhB experiments showed that the prepared ternary photocatalyst of g-C 3 N 4 /Ag–TMCs exhibited excellent photocatalytic activity not only compared with the bare TMCs and Ag–TMCs, but also with all of those reported TiO 2 /Ag/g-C 3 N 4 ternary photocatalysts. Such improved photocatalytic properties were attributed to the synergistic effect created by the LSPR effect and an important role as an electron-conduction bridge of Ag and the existence of heterojunction structure formed between Ag, TMCs and the further coupling g-C 3 N 4 , which added to the evidences that enabled the prepared g-C 3 N 4 /Ag–TMCs catalyst enhanced transfer efficiency of photogenerated carriers and suppressed recombination rate of electron-hole pairs. Moreover, the deposited Ag content had a positive effect on the photocatalytic degradation efficiency. On the basis of the results of this study, the specimen of g-C 3 N 4 /9% Ag–TMCs showed RhB degradation efficiency up to 100% under only 15 min visible-light irradiation. A possible degradation mechanism was also proposed based on several characterizations including photoluminescence spectrum and a serious of photoelectrochemical measurements. Overall, the prepared g-C 3 N 4 /Ag–TMCs ternary photocatalyst with good recyclability looked promising for future practical applications in the visible-light photodegradation of organic pollutants.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
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