INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
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IF 3.582
Wen Shen,Bin Wu,Fan Liao,Binbin Jiang,Mingwang Shao
In recent years, platinum-based catalysts are the most promising candidates for hydrogen evolution reaction (HER). Decrease of the Pt usage is an effective way to obtain low-cost hydrogen production. In order to achieve this goal, we synthesized Pt-Ag/SiNW composites with different dosages of Pt, using inexpensive Ag as a co-catalyst and SiNWs as carriers, and tested their catalytic performance in HER. The results showed that the optimal composition of Pt: Ag: Si = 4.1: 21.5: 74.4 in mass ratio. With such a low amount of Pt, the Pt-Ag/SiNW catalyst exhibited exciting HER performance, whose turnover frequency is 6.3H 2 Pt −1 s −1 at −0.2 V vs. RHE, 2.7 times as large as that of 40 wt% Pt/C. This design greatly increased the utilization ratio of Pt, which may open a new way for preparation of other Pt-based catalysts.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
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IF 2.567
Xiang Lv,Fengquan Gao,Yong Yang,Tianhe Wang
We report a simple but novel technique to prepare chemically durable TiO2/Ag films on FTO substrates via coating of P25 TiO2 with colloidal silica as a high temperature binder and subsequent electrochemical deposition of silver nanoparticles (AgNPs). The porous nanostructure facilitated implantation of AgNPs by electrochemical deposition. Extensive measurements on photocatalytic activities of the films prepared under varied conditions showed that TiO2/Ag enhanced MB degradation. Possible mechanisms of such enhancement were discussed in terms of delayed recombination of photogenerated electrons/holes via Schottky barriers and beneficial effects of Surface Plasmon. Experimental results of both electrochemical impedance spectra and transient photocurrent responses on the films supported the observed photocatalytic enhancement by TiO2/Ag heterostructures. The study offers an effective technique to implant uniformly dispersed AgNPs around 3 nm in size within a porous structure and may also provide a strategy for preparations of other functional films on FTO substrates.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2018
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IF 5.123
Yuting Zhang,Dongmei Deng,Xiaoli Zhu,Shuai Liu,Yan Zhu,Long Han,Liqiang Luo
Bimetallic Au-Ag/Co 3 O 4 nanofibers (Au-Ag/Co 3 O 4 NFs) were synthesized by an electrospinning method and calcination treatment. Due to the admirable synergic effect of electrocatalytic ability of Au and Ag, and the large surface-to-volume ratio of Co 3 O 4 nanofibers caused by their rough surface, the synthesized Au-Ag/Co 3 O 4 NFs were applied to a sensing platform for hydrogen peroxide oxidation . Using electrochemical techniques, the novel sensing platform based on Au-Ag/Co 3 O 4 NFs shows a wide linear concentration range with high detection sensitivity of 1241.1 μA mM −1 cm −2 . This sensitive sensor was also applied to determine H 2 O 2 from human breast cancer cells, indicating its great potential application in physiology and pathology.
研究领域:
生物传感器
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材料科学
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医学诊断
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Xiaomeng Dou,Weiming Hao,Xiangqing Li,Lixia Qin,Shi-Zhao Kang
In the present work, Ti mesh loaded with Ag “nanobosk” was prepared through electro-deposition and characterized with X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. Then, the surface enhanced Raman scattering of norfloxacin on the Ti mesh loaded with Ag “nanobosk” was directly explored in norfloxacin aqueous solution. In addition, for practical purposes, the surface enhanced Raman scattering of norfloxacin was studied as a function of content of Ag, pH of solution, ions in water, and salinity, respectively. At last, the surface enhanced mechanisms were discussed preliminarily. The results indicate that the Ti mesh loaded with Ag “nanobosk” is an ultrasensitive surface enhanced Raman scattering substrate for trace norfloxacin in water. When the concentration of norfloxacin is 1 × 10 −5 mol L −1 , the enhancement factor is approximately 5.1 × 10 3 at 1389 cm −1 . And the detection limit is up to 1 × 10 -10 mol L −1 for norfloxacin under optimal conditions. Our work provides a new strategy for designing a sensing platform which is sensitive to trace norfloxacin in water and can be applied in the routine detection.
研究领域:
材料科学
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环境科学
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分析化学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2014
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IF 6.007
Fredrik Gunnarsson,Moa Z. Granlund,Mattias Englund,Jazaer Dawody,Lars J. Pettersson,Hanna Härelind
We report on a high NO x reduction activity over Ag/Al 2 O 3 catalysts, using hydrogen produced in a fuel reformer. The focus of the study is to evaluate the performance of a hydrocarbon selective catalytic reduction (HC-SCR) catalyst in real conditions. Initially, the catalytic materials for the fuel reformer (Rh/CeO 2 -ZrO 2 ) and the HC-SCR (Ag/Al 2 O 3 ) were evaluated in separate bench-scale reactor setups. These two setups were subsequently joined into an integrated bench-scale reactor setup with the aim to evaluate the influence of the reformate on the HC-SCR activity in a controlled environment. In the final phase of the study a 4 wt.% Ag/Al 2 O 3 catalyst doped with 100 ppm(w) Pt was scaled up and tested in a pilot-scale reactor setup. The pilot-scale reactor setup enabled evaluation of the HC-SCR activity in real exhaust gases generated by a single cylinder engine (genset) together with a hydrogen-rich gas supplied from a fuel reformer. Commercial biodiesel (NExBTL) was used as reducing agent for the HC-SCR as well as fuel in the fuel reformer for both the bench-scale and pilot-scale experiments. This study gives an excellent link between evaluations of the catalytic materials, controlled bench-scale experiments and applied engine experiments, proving a viable concept for lean NO x reduction together with onboard hydrogen production. A NO x conversion of above 70% was reached at temperatures below 250 °C, in bench-scale experiments when hydrogen produced in the fuel reformer is added.
研究领域:
环境科学
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催化化学
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能源工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Chunkai Wang,Ting Wang,Yue Liu,Mengge Li,Ding Ma,Zhanhui Ding,Yan Zhu,Yuting Sun,Xiaofei Sun,Liyuan Shi,Ning Ding,Yongfeng Li,Bin Yao
To improve the performance of Cu2ZnSn(S,Se)4 solar cells, a strategy is proposed to improve the quality of absorber and back interface simultaneously by substituting V-doped Mo (Mo:V) for a conventional Mo back electrode and incorporating Ag into the Cu2ZnSn(S,Se)4 (ACZTSSe) absorber in this work. Since p+-type V-doped MoSe2 (MoSe2:V) is formed in the site between the absorber and Mo:V during selenization, the conventional Mo/n-MoSe2 back contact is modified to Mo:V/p+-MoSe2:V, a back surface passivation field (BSPF) is established at the back interface, the band bending of MoSe2:V is downward and that of bottom of the absorber is upward. Further investigation reveals that the back contact modification and Ag doping have a synergistic effect on inhibiting carrier recombination, decreasing series resistance and increasing shunt resistance, thereby leading to the PCE of device without antireflection coating increased from 8.61 to 10.98%, which is larger than the sum of increase in PCE induced by Ag doping alone (8.61 to 9.66%) and back contact modification alone (8.61 to 9.63%). It is demonstrated that the synergistic effect stems mainly from the strengthened BSPF and the further reduced back contact barrier height. The former is due to the increased difference in work function (WF) between MoSe2:V and absorber induced by the reduced WF of the absorber after Ag doping and the raised WF of MoSe2:V after V doping. The latter is due to the downshifted valence band maximum of absorber after Ag doping. This work highlights the synergistic effect of back contact modification and Ag doping on improving the performance of CZTSSe solar cells and also provides an effective way to suppress carrier recombination.
研究领域:
材料科学
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光伏技术
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DOI
高影响因子
ENERGY & FUELS
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2025
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IF 5.3
Yaqi Wang,Ying Zhang,Yuanfeng Wang,Yahe Zhang,Chunming Xu,Zhiming Xu,Quan Shi,Linzhou Zhang
The characterization of olefin compounds is crucial for elucidating the reaction network in thermal cracking processes. In this study, heavy olefins were selectively characterized by using Ag+ complexation electrospray ionization coupled with high-resolution Orbitrap mass spectrometry. Semiquantitative analysis of the olefin content was conducted using naphthalene-d8 as an internal standard. In thermal cracking products, heavy olefins with carbon numbers ranging from C10 to C50 were detected, with a concentration peak observed in the C20–C25 range. Linear monoalkenes were found to be the most abundant species. The molecular composition of olefins in cracking products under various reaction conditions was investigated, and based on these findings, the thermal cracking reaction network was analyzed. Furthermore, the correlation between the olefin content and the bulk properties of the thermal cracking products was well correlated. This study provides valuable insights into the complex reaction network involved in the residual thermal cracking process, thereby providing a theoretical foundation for process optimization.
研究领域:
石油化学
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分析化学
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产品关联
DOI
高影响因子
LANGMUIR
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2024
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IF 3.7
Yuyun Wang,Guoliang Zhang,Duo Yang,Yang Li,Wei Yin,Jingshui Xu
At present, Ni-based coatings are rarely used in the field of voltage control friction because of their poor antifriction, wear resistance, and conductive properties. Therefore, in this paper, Cu-BTC@Ag nanocrystals were used to enhance the nickel coatings, and the effect of voltage on their tribological properties was also investigated. It was found that the grains of coating were refined via the addition of Cu-BTC@Ag nanocrystals, leading to an improvement in the hardness and corrosion resistance of this composite coating. The tribological performance of nickel composite coating could be controlled under different electrical fields. With the comparison of the pure Ni-based coating, the average friction coefficient and wear volume of its composite coating with 5 wt % Cu-BTC@Ag were reduced by 7.0 and 91.8%, respectively, which showed excellent wear resistance without an applied voltage. Under the condition of 20 V, the 5 wt % Cu-BTC@Ag/Ni-based composite coating owned outstanding antifriction performance. Therefore, Cu-BTC@Ag played an intelligent role in regulating the friction of Ni-based coatings under an external voltage. It is due to the accumulation of Cu-BTC@Ag nanocrystals on the surface of the coating under the action of voltage, which played the role of supporting load and effectively reducing wear.
研究领域:
材料科学
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表面工程
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产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
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2024
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IF 5.3
Pan Zhang,Changmei Wu,Lan Xie,Bai Xue,Yi Jiang
Considering the current challenges associated with fossil fuel scarcity and ice accumulation on solid surfaces, we propose a sustainable strategy that utilizes solar energy for ice formation, using a superhydrophobic coating possessing photothermal capabilities to tackle the challenges of icing and de-icing. We have successfully integrated the Fe 3 O 4 @SiO 2 @FAS/Ag-rGO composites into an epoxy matrix to create a photothermal superhydrophobic coating. The innovative coating boasts outstanding super-hydrophobicity with a water contact angle of 153.8°, resulting in a 60 μL water droplet experiencing a freezing delay of 1498 s at −20 °C ambient conditions, which is longer than that of pure EP coating. Additionally, the coating exhibits an impressive photothermal effect, raising the surface temperature to 58.8 °C under 1 sun. The coating also demonstrates rapid de-icing capabilities, clearing ice in just 120 s under 40 mW/cm 2 . By leveraging the light-trapping effect, utilizing the plasma resonance of silver, and incorporating a high surface roughness micro-nano hierarchical structure, the coating achieves exceptional photothermal conversion efficiency and anti-icing performance. Moreover, the coating's chemical and mechanical durability enhance its practicality and potential utility across various applications. In conclusion, this innovative superhydrophobic coating with photothermal properties offers a promising solution for various practical applications such as anti-icing and de-icing.
研究领域:
材料科学
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能源科学
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表面工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
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2024
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IF 7.7
Junlong Zhang,Jie Wei,Jianting Li,Minchuan Xiahou,Zehao Sun,Ao Cao,Youxin Yuanfeng,Guogang Chen,Yanchun He
The indiscriminate discharge of micropollutants ( e.g. , dyes, antibiotics, industrial additives, etc .) represents a significant risk to human health, and the removal of these substances from water bodies has become a prominent area of research within the field of environmental remediation. A simple hydrothermal-precipitation-photoreduction method was employed to synthesize novel Z-scheme heterojunction photocatalysts of AgBr/CoWO 4 /Ag. The catalysts demonstrated remarkable degradation capabilities with regard to a range of micropollutants present in wastewater. Of the catalysts tested, 5AgBr/CoWO 4 /Ag exhibited the highest degradation rates, reaching 98.58% for Rhodamine B, 86.82% for tetracycline hydrochloride, and 95.60% for 2-mercaptobenzothiazole within 60 min. In particular, the reaction kinetic rate of 5AgBr/CoWO 4 /Ag towards Rhodamine B degradation ( k 2 = 0.26278 L mg −1 ·min −1 ) is 9 times that of AgBr ( k 2 = 0.02953 L mg −1 ·min −1 ) and 113 times that of CoWO 4 ( k 2 = 0.00233 L mg −1 ·min −1 ), which serves to highlight the exceptional photocatalytic activity of the material. The experimental data and subsequent analysis indicated that the enhanced photocatalytic performance can be attributed to two factors: firstly, the electron mediation by Ag nanoparticles leading to improved charge separation efficiency, and secondly, the formation of Z-scheme heterojunctions between AgBr and CoWO 4 . The cyclic tests provided confirmation of the excellent stability and recyclability of the AgBr/CoWO 4 /Ag photocatalysts. It is anticipated that this study will facilitate the development of novel methods for the degradation of refractory micropollutants and provide insights into environmental remediation, thereby contributing to the sustainable development of society.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
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IF 4.3
Heng Guo,Hongji Li,Mengyang Xu,Juan Zhou,Dan Zhang,Dandan Wang,Wei Sun
In this study, a core–shell structured bimetallic nano-cube, Au@Ag NCs, was prepared by seed-mediated growth procedure. The array structure of Au@Ag NCs was achieved at the interface through the autonomous assembly technique at the three-phase boundary. Employing polydimethylsiloxane (PDMS) as a flexible carrier, the array structure was effortlessly transferred to the PDMS membrane, bypassing the need for rigid substrates through a simple “pasting” method. This yielded a highly flexible and transparent SERS substrate with an array structure (Au@Ag NCs/PDMS membrane, AAP). In order to promote the selective detection property to the practical samples, molecularly imprinted polymers (MIPs) were coated on the surface of membrane to prepare the imprinted membrane (Au@Ag NCs/PDMS-MIMs, AAP-MIMs). It was demonstrated from the results that the AAP-MIMs exhibited high SERS sensitivity, stability, and uniformity. Furthermore, the flexible substrate possessed commendable mechanical strength, and facilitated the detection of analytes on irregular surfaces. In summary, this substrate held promising potential for practical on-site detection and analysis of specific target substances.
研究领域:
分析化学
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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
FOOD CHEMISTRY
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2025
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IF 9.8
Xishun Peng,Yiheng Yuan,Anjiang Lu,Cunwei Wang,Caizhen Zu,Haili Zhang,Zhongchen Bai
Glyphosate (Gly) residues in agricultural products have a serious health risk, so it is urgent to seek a sensitive and convenient method for recognizing Gly residues in food. In this study, we proposed an electrochemical surface-enhanced Raman spectroscopy (EC-SERS) sensor of polyaniline/reduced graphene oxide/Ag/Cu (PANI/RGO/Ag/Cu) film to detect Gly residues. The EC-SERS sensor of PANI/RGO/Ag/Cu film had a large specific surface area, which could increase the binding sites of cu 2+ /Gly clathrates for boosting specifically its SERS signal. Moreover, Ag/Cu nanoparticles on the surface of film could effectively increase the differential pulse voltammetry signal and SERS signal of Gly molecules. The limit of detection of EC-SERS sensor to Gly could reach 1.9 nM. In addition, the EC-SERS sensor we prepared could also sensitively identify Gly residues on fresh fruit peels. The PANI/RGO/Ag/Cu film we proposed in this paper has great potential for selective and accuracy detecting Gly residues in agricultural products.
研究领域:
食品科学
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分析化学
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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）