ENERGY & FUELS
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2025
·
IF 5.3
Fanghui Wang,Yitong Dou,Hong Zhu
To enhance the oxygen reduction reaction (ORR) performance of silver-based catalysts in anion-exchange membrane fuel cells (AEMFCs), a novel Co@Ag–AgCl core–shell-structured needle-like nanowire catalyst was synthesized via a polyol-solvothermal method using cetyltrimethylammonium chloride (CTAC) as a surfactant. The results showed that when the CTAC concentration was 5 times the critical micelle concentration, the needle-like nanowires had the best dispersibility, and the synergistic interaction between the Ag–AgCl composite shell and cobalt core significantly enhanced the catalytic performance. The Co@Ag–AgCl3/C catalyst demonstrated exceptional ORR activity with a half-wave potential of 0.753 V, a limiting current density of 4.580 mA cm–2, and an electron transfer number close to 4 (3.88). Remarkably, during 10,000 cycles of durability testing (0.3–1.0 V vs RHE), the half-wave potential of the catalyst only shifted negatively by 17 mV, demonstrating better stability than commercial Pt/C (with a negative shift of 18 mV). This work provides critical insights for developing cost-effective non-platinum catalysts in AEMFCs.
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DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 18
·期 1
·1-9
·
IF 4.5
Sun Likun,Xiong Kesi,Zhang Baoning,Fang Jinghong,He Yingchao,Wang Min,Gan Zhixing,Du Fanglin,Sun Qiong,Yu Liyan,Dong Lifeng
In a dual-chamber photocatalytic fuel cell device, polyvinyl alcohol degradation and H 2 evolution were concurrently achieved. The setup involved commercial P25 as the photoanode and Ag@Fe 2 O 3 nanoparticles as the cathode. Additionally, the feasibility of a Fenton-like reaction in the cathode, utilizing Fe 2+ ions and pumped O 2 , was demonstrated. Different cathode materials, polyvinyl alcohol types, and pH values’ effects were assessed on device performance. Quenching tests highlighted photoinduced holes (h + ) and OH· radicals as pivotal contributions to polyvinyl alcohol degradation. Long-term stability of the device was established through cycling experiments.
研究领域:
环境科学
·
材料科学
·
能源科学
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COLLOID AND POLYMER SCIENCE
·
2025
·
IF 2.3
Li Hui,Qu Jianbo
Graphene oxide was functionalized by dopamine to synthesize polydopamine-reduced graphene oxide (PDRGO). PDRGO was further applied as a template and reductant to reduce silver ion to form silver nanoparticles (PDRGO-Ag). Then, the PDRGO-Ag was incorporated into waterborne polyurethane (WPU) by in situ emulsification to fabricate the PDRGO-Ag embedded WPU nanocomposite films (WPU/PDRGO-Ag). Herein, the PDRGO-Ag was regarded as a photothermal agent that offers effective and controllable photothermal converters for bactericidal applications. Meanwhile, silver nanoparticles acted as an antibacterial agent that endow synergistically enhanced antibacterial properties to the PDRGO-Ag. The resulting film exhibited exceptional antibacterial performance against both E. coli and S. aureus . Moreover, the WPU/PDRGO-Ag films showed improved mechanical properties. The development of this light-induced functional WPU-based film opens a new pathway to antibacterial composite coatings. Graphical
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Catalysis Science & Technology
·
2025
·Vol. 15
·期 15
·4515-4527
·
IF 4.2
Huawei Xie,Bei-Bei Zhang,Fang-Xing Xiao
Antimony sulfide (Sb2S3) has been deemed a promising semiconductor for solar energy conversion owing to its suitable energy level position. However, so far, Sb2S3-based photocatalytic systems have been poorly reported, making Sb2S3-dominated photocatalytic mechanisms elusive. Herein, an efficient electrostatic self-assembly strategy was developed to fabricate metal nanocrystal (NC)-functionalized Sb2S3 nanorod (Sb2S3 NRs-M, M = Au, Ag, Pd) heterostructures. The tartaric acid (TA) molecules grafted on the Sb2S3 NR surface served as coordination sites, which enabled the self-assembly of the metal precursor on the Sb2S3 NR surface via electrostatic and coordinate interactions. The as-prepared Sb2S3 NRs-M (M = Au, Ag, Pd) heterostructures demonstrated significantly enhanced photoactivities toward the mineralization of organic pollutants under visible light irradiation, surpassing those of the pristine Sb2S3 NR counterpart. The contributing role of metal NCs as “electron reservoirs” in boosting the charge separation was determined. Furthermore, active species participating in the photocatalytic reaction were determined, and the photocatalytic mechanism was unveiled. This study offers an efficacious strategy for the rational construction of metal NC-functionalized Sb2S3 NRs for widespread photocatalytic applications.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Ting-Ting Li,Jinlong Zhou,Shiqi Wang,Xiaomeng Wang,Jia-Horng Lin,Yexiong Qi,Ching-Wen Lou
The application of piezoelectric bioscaffolds in bone tissue repair and regeneration has emerged as a research field. Barium titanate exhibits excellent piezoelectric properties and good biocompatibility, making it an ideal material for bone scaffolds. However, defects such as incomplete polarization and unstable piezoelectric properties significantly limit its application in this field. In this study, Ag+-modified barium titanate was mixed with hydroxyapatite in a sodium alginate solution, cross-linked to form a composite gel, and then injected into two-dimensional woven tubes. Through freeze-drying, woven bone scaffolds with a specific structure were successfully prepared. Ag+ significantly improved the piezoelectric stability of barium titanate. After polarization, the bone scaffold can generate a maximum output voltage of approximately 800 mV and an output current of 4.6 μA. Additionally, in vitro cell viability experiments indicate that the survival rate of osteoblasts on the polarized scaffold increased to 205.98%. This study expands the variety of bone regeneration materials and provides theoretical foundations and technical support for the development of bone tissue engineering.
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RSC Advances
·
2018
·Vol. 8
·期 66
·37729-37734
·
IF 2.936
Xiaofeng Lin,Wensheng Lin,Meijia Yang,Jiayao Chen,Dingshan Yu,Wei Hong,Xudong Chen
The chain reaction amplification mechanism (CRAM) has been extensively studied, but it has not been effectively developed at the molecular scale and still needs to consume amounts of monomers to show the macroscopic phenomenon needed for detection. Herein, rationally-designed silica-coated silver nanoparticles with acrylic acid-functionalization were used as a plasmonic nanosensor to realize highly sensitive and fast colorimetric glucose detection with less monomer consumption, which effectively integrated CRAM with the localized surface plasmon resonance effect, developing CRAM at the molecular scale. The glucose detection mechanism of the proposed sensor was based on free-radical polymerization by biocatalytic initiation, which would induce the aggregation of Ag NPs, leading to a decrease in the plasmon resonance intensity. As a result, the detection limit could reach 2.06 × 10−5 M, 10 times lower than that of a commercial glucose assay kit with a limit of 1.1 × 10−4 M. Moreover, FDTD simulation further confirmed that the intensity of the extinction gradually decreased with an increase in the degree of aggregation of Ag NPs. The approach could be used for high selectivity toward glucose detection and would be suitable for other practical applications of the detection of low concentrations of glucose.
研究领域:
生物化学
·
纳米医学
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Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Xiaoyu Huang,Lin Chang,Youguang Lu,Zhanhai Li,Zewen Kang,Xiaohui Zhang,Minghuan Liu,Da-Peng Yang
Advances in nanotechnology provide plenty of exciting solutions to environmental issues affecting air, soil as well as water. To solve the water pollution problem caused by organics and microorganisms, development of a simple, environment-friendly, and cheap method for the synthesis of nanomaterials is of paramount importance. Herein, we prepared a novel nanocomposite (named Eggshell/Ag) using waste eggshell as a support and Cacumen platycladi extract as reducing and stabilizing agents in aqueous solutions at room temperature. Biogenic-stabilized Ag nanoparticles (Ag NPs) with an average diameter of 60 nm were well-dispersed on the surface of eggshells, exhibiting dual-functional properties of organics catalytic degradation and bacterial growth inhibition. Through five repeated assays, it was established that the reduction efficiency of the nanocomposite for 4-nitrophenol (4-NP) was high. The reduction could be completed rapidly at room temperature. Moreover, significant inhibition zones were observed for Staphylococcus aureus ( S. aureus ) agar plates and Escherichia coli ( E. coli ). Meanwhile, the minimum inhibition concentrations (MIC) were determined to be 0.08 and 0.04 mg mL −1 , respectively, while the minimum bactericidal concentration (MBC) was measured as 0.64 mg mL −1 . The biogenic Eggshell/Ag nanocomposites are promising candidates for a series of applications in the fields of biomedicine, environment as well as energy.
研究领域:
环境科学
·
纳米生物学
·
生物医学
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APPLIED ENERGY
·
2019
·
IF 8.426
Heping Xie,Shuo Zhai,Bin Chen,Tao Liu,Yuan Zhang,Meng Ni,Zongping Shao
Hybrid direct coal fuel cells (HDCFCs) have the potential to convert coal into electrical power in a clean and efficient manner. However, the related coal pretreatment method and the anode activity should both be improved, before the HDCFCs could match the performance of other direct coal fuel cells such as those based on solid oxide. In this study, we pyrolysed bituminous coal at 800 °C followed by modification with acetic acid, in order to remove organic volatiles and reintroduce surface functional groups, respectively. The result was a modified char that was highly pure and with high oxidation activity. Further, the Ni-(Y 2 O 3 ) 0.08 (ZrO 2 ) 0.92 anode was infiltrated with Ag nanoparticles as an effective catalyst to promote the electro-oxidation of carbon. Under optimised conditions, the HDCFC with Ag-infiltrated anode and modified char as fuel demonstrated a maximum power density (403 mW cm −2 at 750 °C) that exceeds previous results for coal-based fuels. The cell also showed stable operation for 14 h, with a fuel conversion of 97.22% and Faradic efficiency of 61.06% using 0.4 g modified char.
研究领域:
能源科学
·
材料科学
·
化学工程
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Small
·
2024
·
IF 13
Han Xu,Rutao Meng,Xuejun Xu,Yue Liu,Yali Sun,Yi Zhang
Alkali metal is the requirement for highly efficient Cu 2 ZnSn(S, Se) 4 (CZTSSe) solar cells, thus it is crucial to additionally incorporate alkali metal into the absorber layer for flexible solar cells. However, the efficiency of flexible CZTSSe devices reported to date, based on the conventional alkali incorporation strategies, still lags behind those made on rigid substrates. One of the main issues is the inability to control the alkali content and distribution in the absorber layer. Here, a facile alkaline incorporation approach is proposed, effectively regulating the content and distribution of alkali metals in the film. Such a method can spontaneously tailor the alkali metal content to a proper level, thus leading to the suppression of non-radiative recombination and a better carrier transport through the enhanced film quality and the optimized band binding structure. Finally, a champion flexible CZTSSe solar cell with an efficiency of 11.88% is achieved, the highest reported efficiency for a CZTSSe solar cell without noble Ag doping. This study affords an innovative spontaneous alkali-doping design for the preparation of high-performance flexible CZTSSe solar cells and provides a deeper insight into the extent of alkali metal doping.
研究领域:
材料科学
·
可再生能源
·
光伏技术
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Energy Storage Materials
·
2020
·
IF 16.28
Mohsin Ali Marwat,Weigang Ma,Pengyuan Fan,Hassan Elahi,Chanatip Samart,Bo Nan,Hua Tan,David Salamon,Baohua Ye,Haibo Zhang
The progress in advanced dielectrics by tremendously enhancing the discharge energy densities is of great importance for the current electronic power systems . Herein, we report heterogeneous sandwich-structured nanocomposites with low nanofillers content, which offered the ultrahigh discharge energy density ( U e ) of 21.03 J/cm 3 at 592.1 MV/m. This energy density is the highest reported until now, with similar nanoparticle content and equivalent electric field. We used linear-type polyetherimide as the outer two layers, which offered insulation of charge injection from electrodes, reduced polymer free-volume, improved breakdown strength , and enhanced the overall thermo-mechanical stability. Besides, dopamine@Ag@BaTiO 3 nanoparticles (DA@Ag@BT NPs)-modified ferroelectric-type polyvinylidene fluoride is employed as the middle layer for rendering higher polarizability and additionally increased breakdown strength due to well-known Coulomb blockade effect. Finite element simulations showed reduced local electric field in the outer, as well as middle layer matrixes, indicating higher breakdown strength and consequently higher energy storage prospects of heterogeneous sandwich-structured nanocomposites. The energy storage results at high temperatures demonstrated its significant thermal stability until 170 °C. Overall, this contribution not only paves the new way for developing industrially viable low nanofillers-concentrated flexible dielectric films but also provides the insight of polarization mechanism and electric breakdown in heterogeneous sandwich-structured dielectric materials.
研究领域:
材料科学
·
电子工程
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高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Lin Xing,Xiaoyu Zheng,Yulian Tang,Xuemei Zhou,Junkai Hao,Lei Hu,Jinglin Shen,Zhengquan Yan
To strengthen the properties of nanozymes, a Ag-β-cyclodextrin-graphene oxide ternary nanocomposite (Ag-β-CD-GO) was developed first by a homogeneous redox-active self-assembly method. Taking advantage of the excellent environmental compatibility, high surface areas, and strong hydrogen-bonding ability of β-cyclodextrin and graphene oxide, the proposed Ag-β-CD-GO exhibited superior peroxidase-mimicking activity, high stability, and nontoxicity as well. It could accelerate the oxidation–reduction reaction of the common colorimetric substrate 3,3′,5,5′-tetramethylbenzidine (TMB) and the oxidant H2O2 with Michaelis constants (Km)/maximal reaction rates (Vmax) of 3.3 mmol·L–1/2.45 × 10–8 mol·L–1·s–1 and 0.13 mmol·L–1/2.52 × 10–8 mol·L–1·s–1, respectively. Interestingly, toxic Hg2+ could decrease the characteristic UV–vis absorbance at 653 nm of the Ag-β-CD-GO-TMB-H2O2 system exclusively with an obvious color change from blue to colorless, expressing a visual hypochromic effect. Under the optimal testing conditions (pH 4.0, 180 μL of 1.5 mmol·L–1 TMB, 180 μL of 1.0 mol·L–1 H2O2, incubation for 20 min at 25 °C), the target Ag-β-CD-GO-TMB-H2O2 was efficiently utilized for visual monitoring of toxic Hg2+ in natural water, drink, and fruit juice samples with quite a low detection limit, i.e., 8.3 × 10–10 mol·L–1 (S/N = 3), far below the 3.0 × 10–8 mol·L–1 permitted in drinking water by the World Health Organization (WHO). The synergetic enhancement peroxidase-mimicking activity of Ag-β-CD-GO and the exclusive recognition mechanism to Hg2+ were further investigated in detail.
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Small
·
2026
·
IF 11.8
Le Jing,Yexin Pan,Yangyi Huang,Nan Xu,Siyu Chen,Haosong Zhong,Yi Chen,Yee Him Timothy Chan,Mitch Guijun Li
Nicotinamide adenine dinucleotide ( NAD + ${\rm NAD}^+$ ) is a core redox cofactor, and its concentration reflects age and metabolic state, which has driven the development of NAD + ${\rm NAD}^+$ biochemical analytical techniques. Although electrochemical techniques can rapidly and directly detect NAD + ${\rm NAD}^+$ levels, the translation of laboratory sensors into deployable solutions is often limited by the complexity of electrode interface preparation and batch-to-batch variability. Especially among enzyme-assisted methods, the multi-step biochemical immobilization and activity preservation processes are required. Therefore, developing enzyme-free and scalable NAD + ${\rm NAD}^+$ electroanalytical manufacturing strategies remains important. Here, a rapid two-step laser-induced transfer strategy is proposed to fabricate flexible silver nanoparticle–decorated carbon cloth electrodes (AgNPs@CC) for enzyme-free NAD + ${\rm NAD}^+$ sensing. This strategy reduced interfacial impedance and established a robust cathodic window for enzyme-free NAD + ${\rm NAD}^+$ detection. The electrodes exhibit a linear operating range of 10–300 , an excellent sensitivity (S = −3.16 ) at the low concentration range(10–100 ), and outstanding tolerance to typical interferents (LA, UA, AA, glucose, and NADH) and robust storage stability. This method eliminates the wet-chemical nanoparticle synthesis step and simplifies the production workflow, offering potential for applications like integration into portable sensing platforms.
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高影响因子
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