JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Hassanien Gomaa,Cuihua An,Penggang Jiao,Wenliu Wu,Hassan A.H. Alzahrani,Mohamed A. Shenashen,Qibo Deng,Ning Hu
Owing to the high cost of precious metal catalysts for the oxygen evolution reaction (OER), the production of highly efficient and affordable electrocatalysts is important for generating pollution-free and renewable energy via electrochemical processes. A facile hydrothermal approach was employed to synthesize hybrid mesoporous iron-nickel bimetallic sulfides @ P, N -doped carbon for the OER. The prepared Fe 0.5 NiS 2 @C exhibited an overpotential (η) of 250 mV at 10 mA/cm 2 . This exceeded the overpotentials recently reported for surface-modified P, N -doped carbon-based catalysts for the OER in a 1 M KOH medium. Moreover, the Fe 0.5 NiS 2 @C catalyst showed a notable Tafel slope of 90.5 mV/dec with long-dated stability even after 24 h at 10 mA/cm 2 . The superior OER performance of the Fe 0.5 NiS 2 @C catalysts may be due to their large surface area , sheet-like morphology with abundant active sites, fast transfer of mass and electrons, control of the electronic structure by co-treatment with heteroatoms (e.g., P and N), and the synergistic effect of bimetallic sulfides, making them favorable catalysts for the oxygen evolution reaction. Density functional theory (DFT) calculations showed that the Fe 0.5 NiS 2 @C catalyst exhibited strong H 2 O-adsorption energy. The enhanced OER activity of Fe 0.5 NiS 2 @C was attributed to its higher surface area, favorable H 2 O adsorption energy , improved electron transfer efficiency, and lower Gibbs free energy compared to those of the other proposed catalysts.
研究领域:
材料科学
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电化学
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能源科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Zhijia Xiao,Jinlong Wang,Xinyi Ke,Zihan Lu,Zhe Zhao,Yongfeng Mei,Gaoshan Huang
The incorporation of metal–organic frameworks onto conductive substrates demonstrates considerable potential in applications related to the hydrogen evolution reaction. In this work, we present a streamlined synthesis approach involving atomic layer deposition pretreatment to facilitate the controlled growth of Cu-BDC particles on a conductive Nafion film. This methodology preserves a substantial loading of Cu-BDC with a hierarchically porous structure, accompanied by a notable surface area of 547 m2 g–1. The composite is subsequently utilized as an electrocatalyst for hydrogen generation in an alkane electrolyte. The structural advances in the composite result in a superior electrochemical hydrogen production efficiency with a low overpotential of 84 mV and a low Tafel slope of 58 mV dec–1 in 1.0 M NaOH. Notably, the composite showed good cycling performance during the 18 h test with 2000 cycles. This research introduces a design of a catalyst electrode with promising implications for the hydrogen production industry.
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
CRYSTAL GROWTH & DESIGN
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2022
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IF 4.01
Yunping Zhoujin,Yuping Li,Peng-Yu Liang,Pan-Pan Zhou,Sean Parkin,Tonglei Li,Faquan Yu,Sihui Long
A series of homologues (1–4) of fenamic acid have been synthesized by varying the length of the linker between the two aromatic rings, and their polymorphism has been investigated. Under the same crystallization conditions, each of the newly synthesized compounds leads to two forms, except for compound 1, which indicates that additional flexibility due to homologation does not necessarily lead to more polymorphs. The molecules in each polymorphic system show different conformations due to the rotation about specific sigma bonds. Phase transitions are observed between the polymorphs of each system. Conformational analysis and Hirshfeld surface analysis were applied to investigate the effect of conformational flexibility on the polymorphism of these compounds.
研究领域:
化学
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材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Guoxiao Xu,Shiji Xue,Zenglv Wei,Jing Li,Konggang Qu,Ying Li,Weiwei Cai
With PWA as proton transfer and silica as water retainer, stable phosphotungstic acid/silica/Nafion (PWA/Si–N) composite membrane is non-destructively fabricated and exhibits excellent stability and high temperature proton conductivity . Compared with pristine Nafion , high temperature proton conductivity is significantly enhanced due to the collaboration between –SO 3 H ionic clusters and the in -situ filled silica embedded PWA nanoparticles . PWA is stabilized in the ionic clusters via in-situ catalyzing the hydrolysis silica precursor targeted filled into the –SO 3 H ionic clusters. Stable proton conductivity of the PWA/Si–N membrane at 110 °C and 60% RH is high to 0.058 S/cm, which is 2.4 folds of that of Nafion. At the same time, the composite membrane still maintains good mechanical and thermal stability. As a result, high temperature fuel cell performance of the composite membrane is improved by 41% compared with the pristine Nafion membrane . The in -situ coating method proved to be an effective method to solve the stability of PWA in Nafion membrane, especially the inorganic oxide with good hygroscopicity as the modifier.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
ANALYST
·
2012
·Vol. 138
·期 3
·887-893
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IF 4.23
Lu Zhang,Kao Zhu,Tao Ding,Xianyun Hu,Qingjiang Sun,Chunxiang Xu
We have developed a new fluorescent probe based on direct conjugation between 1,10-phenanthroline (Phen) and water-soluble thioglycolic acid (TGA) capped CdTe quantum dots (QDs) for the detection of double-stranded DNA (dsDNA). Phen could directly adsorb onto the QDs surface by metal-affinity driven coordination, quenching the photoluminescence (PL) of QDs via the photoinduced hole transfer process; addition of dsDNA would bring the restoration of QDs PL, as Phen could intercalate into dsDNA followed by its dissociation from the QDs surface. The dependence of QDs PL on the dsDNA amount as well as temperature was utilized to investigate the Phen–dsDNA interaction. The obtained binding constant of the QD–Phen dyad was 2–3 orders of magnitude higher than that of Phen-based metal complexes. Both the binding constant and the binding site of dsDNA with Phen increased with the elevated temperature, owing to an endothermic process. At 37 °C, sensitive detection of dsDNA with a detection limit of ∼3 nmol L−1 was achieved. Therefore, the QD-molecule direct conjugation based fluorescent probe could provide an effective alternative to those based on QD-bioconjugation and QD-ionic conjugation.
研究领域:
生物化学
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分子生物学
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纳米生物学
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产品关联
DOI
PubMed
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
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2013
·
IF 2.404
Wanyun Liu,Junchao Wei,Ping Huo,Yunhua Lu,Yiwang Chen,Yen Wei
In this work, PEG–PLLA electrospun fibers were developed as a new controlled release system for macrolide antibiotic drug brefeldin A (BFA). SEM and XRD analyses of the BFA-loaded PEG–PLLA fibers revealed that the average diameter of fibers was below 950 nm with smooth surfaces, and the drug was well incorporated into the fibers in amorphous form. The release profiles of BFA in PBS were measured by HPLC, demonstrating that the controlled release of BFA could be gained for long time. The in vitro antitumor activity against human liver carcinoma HepG2 cells of the fibers containing 3%, 6%, 9%, 12% and 15% BFA were examined by MTT method, and the results showed that cell growth inhibition rates at 72 h were 64%, 77%, 80%, 81% and 85%, respectively. These results strongly suggested that the BFA/PEG–PLLA fibers had an effect of controlled release of BFA and were suitable for postoperative chemotherapy of cancers.
研究领域:
药学
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肿瘤学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Wanqing Zhang,Guangri Xu,Runqiang Liu,Jun Chen,Xiaobo Li,Yadong Zhang,Yuping Zhang
A sensitive and selective sensor was fabricated to determine melamine (Mel), based on MIL-53@XC-72 nanohybrid modified glassy carbon electrode (GCE). The MIL-53@XC-72 nanohybrid was synthesized from MIL-53 via hydrothermal method, followed by adulterating with XC-72. The prepared sensor possessed high sensitivity and selectivity due to the synergistic effect of the large surface of MIL-53, the bonding interaction between Mel and MIL-53 as well as the high conductivity of XC-72. Under the optimal conditions, the sensor exhibited rapid electrochemical response to Mel at the potential of 0.7 V in 0.1 M HCl solution. A linear concentration range of Mel was obtained from 0.04 to 10 μM with a linear correlation coefficient of 0.998 and detection limit of 0.005 μM (S/N = 3). In addition, the sensor presented excellent reproducibility, high stability and selectivity, and was successfully applied for the determination of Mel in liquid milk with a good recoveries. Hence, the MOFs@XC-72-Nafion-GCE sensor could be considered as promising applicability for the determination of other electrochemically inactive analytes.
研究领域:
分析化学
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食品科学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2013
·
IF 2.672
Mei-Jin Li,Yun-Qin Shi,Tao-Yu Lan,Huang-Hao Yang,Guo-Nan Chen
The electrogenerated chemiluminescence (ECL) of two water-insoluble iridium(III) complexes (pq) 2 Ir(acac)(pq = 2-phenyl quinolone anion, acac = acetyl acetonate) and (ppy) 2 Ir(acac)(ppy = 2-phenylpyridine anion) in carbon nanotube (CNT)/Nafion composite films was investigated at a glassy carbon (GC) electrode. CNT and Nafion play significant roles in the iridium(III) complexes immobilization. The excellent chemical stability and electrical conductivity of CNT promote electron transfer. The experimental conditions, such as potential, pH, concentrations of CNT and various coreactants were investigated. The iridium(III) complexes modified electrode had good stability and reproducibility. In our work, the (pq) 2 Ir(acac)/DBAE (2-(dibutylamino)ethanol) system was used to detect the codeine, one of the many narcotics, and the detection limit was 0.05 μM ( S / N = 3). This method enabled the two water-insoluble iridium(III) complexes to be used for the determination of the analyte in aqueous solution.
研究领域:
分析化学
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电化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Chaomeng Dai,Wang Kai Tong,Jia Jie Zou,Min-tian Gao,Yalei Zhang,Shuguang Liu,Tingzhu Li,Jixiang Li,Jiajun Hu
Micro-nanobubbles (MNBs) with their negatively charged surface and cationic surfactant with a positively charged hydrophilic head were designed to synergistically solubilize polycyclic aromatic hydrocarbons (PAHs). Through response surface method experimentation, the results showed that MNBs had no obvious solubilizing effect for the PAH, phenanthrene . However, MNBs and the cationic surfactant didodecyldimethylammonium bromide (DDAB) had a synergistic solubilization effect on phenanthrene. Through the analysis of physical and chemical factors, it could be inferred that the synergy was caused by a conversion in the structure of the vesicles formed by DDAB after the combination of DDAB and MNBs. This structure conversion improved the phenanthrene solubility. In addition to being amplified, this synergy was verified to be universal and could be strengthened. The synergy, which increased with increasing DDAB and MNB concentrations, could achieve up to about 3 times the solubilizing as that without MNBs. In addition to DDAB, MNBs could also synergistically solubilize phenanthrene with other cationic surfactants. Changing the gas source of MNBs from air to nitrogen or oxygen could increase the negative surface charge, which enhanced the synergistic effect between MNBs and cationic surfactants. These results demonstrate a novel method for synergistic solubilization of PAHs by surfactant and MNBs while it can decrease the excessive use of surfactants causing the pollution issues. The synergistic effect between cationic surfactants and MNBs has the potential to be widely used in environmental and medical fields.
研究领域:
环境科学
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医学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 35
·19466-19475
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IF 4.22
Ding Jinjin,Zhang Mengke,Wei Xiaoqing,Song Wenwu,Wang Jin,Sun Tongming,Zhu Jinli,Wang Minmin
A rational structural strategy to design rambutan-like NiFe-LDH nanocluster arrays electrode via a buffer-salt-assisted hydrothermal method was reported. For our developed electrode, large stable current density of 100 and 200 mA cm −2 at overpotential of only 283 and 300 mV in oxygen evolution reaction in alkaline electrolyte was obtained, which is dramatically lower than many previous reported overpotentials. It also exhibits low Tafel slope at current range from 10 to 25 mA cm −2 (56.47 mV dec −1 ). Further analysis demonstrates the key role of higher carriers of the rambutan-like NiFe-LDH nanocluster arrays electrode in boosting the water-splitting performance of the resulting system. Benefiting from the fine geometry shape of the self-supported nanocluster nanoarrays electrode, the transfer process of the reactants and oxygen/hydrogen bubbles is accelerated. In addition, a 19-time enhancement of carrier concentration for our developed rambutan-like NiFe-LDH nanoclusters (2.9 × 10 29 m −3 ) is obtained. Notably, the resultant rambutan-like NiFe-LDH nanocluster arrays electrode exhibits enhanced stability (in high and low current density) for the full water splitting in 1 M KOH, remaining nearly 100% of the original current density after continued testing for 20 h. This finding may provide new insight on rational structural design LDH nanostructures with high performance for electrocatalysis. Graphic abstract A highly hydrophilic NiFe-LDH nanocluster arrays electrode is developed for efficient full water splitting. Large and stable current density of 200 mA cm −2 is obtained at overpotential of 300 mV. Besides, the faraday efficiency is nearly 100%.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 33
·期 1
·96-103
·
IF 3.665
Meng Wang,Lin Mu,Hao Zhang,Suqian Ma,Yunhong Liang,Lei Ren
The flexible stretchable sensors have great potential for implementation in various applications, such as intelligent soft robots, health monitoring, and motion detection. However, most of the flexible stretchable sensors with microstructures and high sensitivities are fabricated by expensive templates and complex processes. In consideration of large-scale fabrication, a low cost and efficient way is in great demand. Herein, electroless plating on Nafion films with decent swelling ratios are proposed to fabricate stretchable sensors with wrinkle-structured electrodes. By adding isopropanol (IPA) to the electroless plating process, the H 2 O-IPA sensor with larger swelling ratio shows deeper surface wrinkles, higher surface roughness, and better sensitivity to strain. At the same time, the H 2 O-IPA sensor exhibit good durability (500 cycles). By mounting the sensor on the joint of human finger, the motion of the finger bending and even the bending degree can be accurately detected, indicating the potential use in the field of wearable devices and soft electronic skins.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2022
·
IF 6.978
Fei Fu,Minggui Shen,Dan Wang,He Liu,Shibin Shang,Fei-Long Hu,Zhanqian Song,Jie Song
Low-k dielectrics are urgently needed in modern integrated circuits. The introduction of free volume instead of porous structures has become a powerful strategy to reduce the k value. According to this strategy, the biomass resource rosin-containing hydrogenated phenanthrene ring was introduced into benzocyclobutene (BCB) resin to reduce the k value; then a rosin-based BCB monomer was successfully synthesized. Meanwhile, the BCB monomer without a rosin skeleton was prepared. After converting the monomers into thermo-crosslinked materials, notably that the rosin skeleton has a great influence on the free volume and k value of the material. The fractional free volume and k value of the former are 26% and 2.44, respectively, and those of the latter are 14% and 2.84, respectively. In addition, the distances between molecular chains and the density of the former are 0.60 nm and 1.06 g cm–3, respectively; those of the latter are 0.56 nm and 1.28 g cm–3, respectively. These data show that introducing hydrogenated phenanthrene rings occupies part of the space and hinders the packing of molecular chains, which increases the distance between molecular chains and reduces the density of the polymer, resulting in an increasing free volume and a reducing k value. Notably that introducing hydrogenated phenanthrene rings cannot affect other properties of the material. Therefore, this research indicates that introducing rosin skeletons can prepare high-performance materials, which provide some promising low-k materials for the development of electronics and microelectronics.
研究领域:
材料科学
·
电子工程
✓ 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）