INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Kaiyu Dong,Yuehuan Zhang,Zhe Zheng,Xiaotong Yang,Qiang Yuan
Metallic aerogels (MAs) with self-supporting three-dimensional (3D) porous structures constitute a potential platform for the construction of robust catalysts. In this work, we successfully constructed 3D PdAu MAs with the optimized d-band electron of Pd and geometrical lattice expansion using a maneuverable in-situ seed-mediated strategy at room temperature . The introduction of Au accelerated the kinetics of Pd 4 Au 3 MAs toward oxygen reduction reaction (ORR), ethylene glycol oxidation reaction (EGOR), and ethanol oxidation reaction (EOR) in alkaline electrolyte , boosting the activity and stability of Pd 4 Au 3 MAs. The mass activities of Pd 4 Au 3 MAs/C in ORR, EGOR and EOR were 1.74, 8.57, and 9.54 A mg Pd −1 , respectively, which were remarkably better than those of referenced Pd MAs/C, commercial Pt/C and Pd/C. The rotating ring-disk electrode measurement illustrated that Pd 4 Au 3 MAs/C achieved a 4-electron transfer process in ORR from O 2 to OH − . In-situ Fourier transform infrared spectroscopy revealed that Pd 4 Au 3 MAs/C enabled the cleavage of the C–C bonds, thus accomplishing the C1-complete oxidation of 10-electron ethylene glycol and 12-electron ethanol. This study provides an efficient strategy to fabricate binary non-Pt alloy aerogels as high-performance multifunctional electrocatalysts for ORR, EGOR, and EOR.
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ELECTROCHEMISTRY COMMUNICATIONS
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2012
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IF 4.859
Qiao-Xin Zhang,Li-Bing Yin
Spherical Au–Pd bimetallic nanoparticles , for the first time, have been elucidated to have a high electrochemical performance toward As(III) by square wave anodic stripping voltammetry . A strong Pd tuned effect on electrochemical performance in the detection of As(III) was found. A high sensitivity of 3.9 μA/ppb with a low limit of detection (LOD) of 2.40 × 10 − 2 ppb was obtained for Au 1 Pd 3 bimetallic nanoparticle.
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ELECTROANALYSIS
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2012
·Vol. 24
·期 6
·1334-1339
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IF 2.872
Yang Fan,Xin Yang,Chunpeng Yang,Jinhang Liu
We describe a simple method for preparing Au-TiO 2 /graphene (GR) nanocomposite by deposition of Au nanoparticles (NPs) on TiO 2 /GR substrates. The as-prepared Au-TiO 2 /GR was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The presence of Au NPs on TiO 2 /GR surface remarkably improves the electrocatalytic activity towards the oxidation of hydrogen peroxide (H 2 O 2 ) and β -nicotinamide adenine dinucleotide (NADH). The Au-TiO 2 /GR modified glassy carbon (GC) electrode exhibits good amperometric response to H 2 O 2 and NADH, with linear range from 10 to 200 µM and 10 to 240 µM, and detection limit of 0.7 and 0.2 µM, respectively.
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ANALYTICA CHIMICA ACTA
·
2012
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IF 4.555
Dongyue Li,Jing Li,Xiaofang Jia,Yanchao Han,Erkang Wang
A simple, rapid and sensitive sensing platform for the detection of As(III) has been fabricated in neutral media based on the mercaptoethylamine modified Au electrode. A wide detection range of 0.2–300 μg L −1 and a low detection limit of 0.02 μg L −1 were obtained with a preconcentration time of 100 s under optimal conditions. Compared with previous studies, this work shows obvious advantages that it not only suppresses the Cu(II) interference, but also can detect the As(III) in natural water samples at the original pH avoiding high concentration acidic media. Moreover, the practical application of the proposed method was verified in the lake water sample determination.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Libo Sun,Qingtai Xie,Heshun Jing,Xueqing Liu,Lijun Zhao,Xun Sun,Baorong Duan,Caixia Qi,Huijuan Su
Here, Au/polydopamine (Au/PDA) catalysts were prepared by gold sol adsorption (Au/PDA(Sol)), PDA in situ reduction (Au/PDA(PDA reduction)) and DA in situ reduction (Au/PDA(DA reduction)). The factors that influence the performance of Au-PDA on the reduction of 4-nitrophenol (4-NP), were systematically studied for the first time. The catalytic performance of Au/PDA(Sol) is the best because of the uniform and small size of Au nanoparticles (NPs) (3.2 ± 0.7 nm), with a turn over frequency (TOF) of 10125 h −1 , a mass-normalized rate constant ( k’ ) of 33360 min -1 g Au -1 and an apparent activation energy (Ea) of 11.39 KJ/mol. It is confirmed that there are electronic interactions between Au and the catechol hydroxyl groups and imino groups of PDA. Some unreduced Au 3+ ions can be reduced in situ by NaBH 4 during the catalytic reaction, forming ultra small Au NPs and leading to a good initial catalytic activity, especially for Au/PDA(DA reduction). This work systematically studied the influencing factors in catalysis for Au/PDA, providing guidance for the preparation and industrial application of PDA supported noble metal catalysts.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 24
·12034-12042
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IF 8.867
Rundong Fan,Ligang Wang,Yihua Chen,Guanhaojie Zheng,Liang Li,Ziliang Li,Huanping Zhou
Among the various methods to advance solar cell technologies, the implementation of nanoparticles with plasmonic effects is an effective way to make better use of incident light and manage carrier dynamics. Herein, for the first time we report the systematic synthesis of gold nanospheres or nanorods coated with a thin layer of titanium oxide (Au@TiO2) and use them to examine the plasmonic effect in planar heterojunction perovskite solar cells. The most efficient assembly mode is to embed the Au@TiO2 nanorods into the electron transport layer (ETL), which elevates the average power conversion efficiency (PCE) from 15.76% to 16.35%, mainly attributed to the short-circuit current enhancement. The optimized device assembled with Au@TiO2 nanorods delivers an efficiency of 20.10%. We further explored the plasmonic enhancement effect of Au@TiO2 nanorods based on the combination of UV-visible absorption spectroscopy, incident photon-to-current efficiency (IPCE), photoluminescence (PL) and transient photocurrent decay (TPC). The results indicate better charge separation/transfer as well as facilitated carrier transport in the presence of plasmonic particles. This work provides an insightful understanding of plasmonic effects in planar perovskite solar cells and also presents a promising approach for simultaneous photon and electron management.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-9
·
IF 4.259
Wang Jingyun,Zhang Lei,Huang Youju,Dandapat Anirban,Dai Liwei,Zhang Ganggang,Lu Xuefei,Zhang Jiawei,Lai Weihua,Chen Tao
The probe materials play a significant role in improving the detection efficiency and sensitivity of lateral-flow immunochromatographic test strip (ICTS). Unlike conventional ICTS assay usually uses single-component, solid gold nanoparticles as labeled probes, in our present study, a bimetallic, hollow Au-Ag nanoparticles (NPs) labeled ICTS was successfully developed for the detection of clenbuterol (CLE). The hollow Au-Ag NPs with different Au/Ag mole ratio and tunable size were synthesized by varying the volume ratio of [HAuCl4]:[Ag NPs] via the galvanic replacement reaction. The surface of hollow Ag-Au NPs was functionalized with 11-mercaptoundecanoic acid (MUA) for further covalently bonded with anti-CLE monoclonal antibody. Overall size of the Au-Ag NPs, size of the holes within individual NPs and also Au/Ag mole ratio have been systematically optimized to amplify both the visual inspection signals and the quantitative data. The sensitivity of optimized hollow Au-Ag NPs probes has been achieved even as low as 2 ppb in a short time (within 15 min), which is superior over the detection performance of conventional test strip using Au NPs. The optimized hollow Au-Ag NPs labeled test strip can be used as an ideal candidate for the rapid screening of CLE in food samples.
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Materia-Rio de Janeiro
·
2025
·
IF 1.2
Wang Lina,Li Lili,Pang Zhenxing,Hui Xuesong
This study reports a facile synthesis of Au-modified Nano-SnS2 composites through a combined water-thermal and in situ chemical reduction method, aimed at advancing low-temperature gas sensing technology. Comprehensive structural analyses using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy confirmed that incorporation of Au nanoparticles significantly alters the nanostructure. The results reveal that optimal Au loading at 0.5 wt% refines the crystallite size from approximately 25 nm to 20–23 nm, while uniformly distributed Au particles with diameters of 3–5 nm effectively form Schottky junctions that enhance interfacial charge transfer. Gas sensing measurements demonstrate that the sensor response increases from 4.7 at 1 ppm to 22.6 at 10 ppm NO2, and a linear correlation (R2 = 0.998) was observed in the lower concentration range of 1–4 ppm. Furthermore, the optimal operating temperature decreased from 140°C for the unmodified sensor to 120°C, contributing to reduced power consumption. The transient response characteristics also improved markedly, with a response time of 42 s and a recovery time of 127 s, in contrast to 220 s and 520 s for the pristine material. Long-term stability tests over 40 days revealed less than 4% variation in sensor performance, and selectivity experiments confirmed a strong preference for NO2 over other interfering gases. Overall, the synergistic effects of Au-induced electronic sensitization and catalytic activity result in enhanced sensitivity, faster kinetics, and excellent durability. These significant findings offer valuable insights for designing highly efficient sensors for environmental monitoring, paving the way for future sensor technology.
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ACS Nano
·
2025
·
IF 16
Chuang Shen,Xianghong Niu,Jiaxu Zhang,Shengheng Wang,Jianwei Chen,Fei Xu,Yefan Duan,Ying Zhang,Lixing Weng,Zhimin Luo,Lianhui Wang
Radiotherapy (RT) often has poor clinical sensitivity and tumor metastasis inhibition due to weak X-ray absorption, low energy deposition, inefficient reactive oxygen species (ROS) generation, and induction of antitumor immune response. Here, we report an ultrasmall Bi@Au Schottky heterojunction, namely, Bi@Au nanodots (Bi@Au NDs), to enhance the sensitivity of RT and activate systemic immunity for effective tumor treatment and metastasis inhibition. Bi@Au NDs exhibit a high efficiency of ROS generation and glutathione (GSH) depletion. Density functional theory calculations reveal that Bi@Au NDs with a high Schottky potential barrier can efficiently facilitate carrier separation and prevent carrier backflow, which results in abundant electrons for catalytically decomposing H2O2 to •OH under X-ray irradiation. Experimental results in vitro and in vivo show that Bi@Au NDs can significantly sensitize RT by enhancing ROS generation and GSH depletion. Bi@Au ND-sensitized RT greatly induces immunogenic cell death and thus promotes a CD8+ T cell-mediated systemic immune response, ultimately inhibiting tumor metastasis. Bi@Au NDs as a kind of Schottky heterojunctions can be an effective amplifier for radioimmunotherapy.
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CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Yao Yao,Juping Xu,Minhua Shao
Hydrogen evolution reaction (HER) is unavoidable in many electrochemical synthesis systems, such as CO 2 reduction, N 2 reduction, and H 2 O 2 synthesis. It makes those electrochemical reactions with multiple electron-proton transfers more complex when determining kinetics and mass transfer information. Understanding how HER competes with other electrochemical reduction reactions is crucial for both fundamental studies and system performance improvements. In this study, we employed the oxygen reduction reaction (ORR) as a model reaction to investigate HER competition on a polycrystalline-Au surface, using a rotating ring and disk electrode. It’s proved that water molecules serve as the proton source for ORR in alkaline, neutral, and even acidic electrolytes, and a 4-electron process can be achieved when the overpotential is sufficiently high. The competition from H + reduction becomes noticeable at the H + concentration higher than 2 mmol L –1 and intensifies as the H + concentration increases. Based on the electrochemical results, we obtained an equivalent circuit diagram for the ORR system with competition from the H + reduction reaction, showing that these reactions occur in parallel and compete with each other. Electrochemical impedance spectroscopy measurements further confirm this argument. Additionally, we discover that the contribution of H + mass transfer to the total H + reduction current is significant and comparable to the kinetic current. We believe this work will deepen our understanding of HER and its competition in electrochemical reduction systems.
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Small
·
2025
·
IF 12.1
Xiaoxi Luan,Fengxia Wu,Xiali Lv,Fenghua Li,Yu Tian,Guobao Xu,Xiaodan Wang,Guangchao Zheng,Wing-Leung Wong,Kwok-Yin Wong,Wenxin Niu
Plasmonic nanomaterials with intrinsic chiral morphology represent a profound and intriguing topic in sensing applications due to their ultrasensitive chiral structure-dependent chiroptical activity. Here, an H 2 O 2 -assisted etching strategy is reported, enabling the tunable chiroptical activity of chiral helicoid Au nanocrystals by varying size and morphology. This approach forms the foundation of a chiroplasmonic sensing method leveraging the chiroptical signal response induced by morphological changes. Notably, the method exhibits excellent anti-interference performance, enabling reliable detection in complex and colored sample environments. Moreover, the strategy is extended for glucose detection through glucose oxidase-catalyzed H 2 O 2 production, with quantitative detection in real colored samples confirming its reliability. The chiroplasmonic sensing based on helicoid Au nanocrystal etching exhibits remarkable detection performance in complex environments, offering the potential for practical applications in biochemical analysis and diagnostics.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 25
·1-13
·
IF 2.8
Zhang Yuexing,Feng Wenlin,Ullah Arif
To address the need for high-sensitivity carbon monoxide (CO) gas sensing at room temperature, a CO gas sensor based on Au-modified tin oxide/zinc oxide (SnO₂/ZnO) nanocomposites is fabricated. SnO₂ nanoparticles, ZnO nanosheets, and Au nanoparticles (AuNPs) were synthesized using sacrificial template, hydrothermal, and chemical reduction methods, respectively. The resulting nanocomposite was then drop-casted onto interdigitated electrodes and dried to obtain the CO gas sensor. The performance of the sensor was evaluated using a custom airtight chamber and a semiconductor parameter analyzer. The n–n heterojunction between SnO₂ and ZnO significantly increased oxygen vacancy in the composite material, enhancing surface chemisorption of oxygen. Moreover, the catalytic sensitization effect of AuNPs facilitated electron migration, while their inherent spillover effect promoted the activation of gas molecule interactions. Consequently, the sensor exhibited a high response (22.11%) to 70 ppm CO at room temperature, along with excellent stability, selectivity, and anti-interference capabilities. This work offers a promising approach for developing highly sensitive room-temperature gas sensors.
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