ACS Applied Nano Materials
·
2024
·
IF 5.3
Congyue Sun,Zhongcheng Zhao,Dongyan Xu,Xiaojin Li,Ke Ye
The rapid development of proton-exchange membrane fuel cells needs to develop Pt-based oxygen reduction reaction (ORR) catalysts with activity and stability. In this study, PtCu alloy nanoparticles were in situ anchored on an N-doped porous carbon (NC) derived from ZIF-8 with a chemical reduction method to produce a PtCu/NC catalyst with a Pt loading of 7.96 wt %. The PtCu alloy nanoparticles are uniformly immobilized on the NC with a high surface area via a metal–support interaction. The electrochemical test results demonstrated that the PtCu/NC catalyst displays remarkable activity with an E1/2 value of 0.913 V vs RHE, higher than 0.878 V vs RHE for the commercial Pt/C. The ORR mass activity of the PtCu/NC catalyst is 1.49 and 6.54 times that of PtCu/XC-72 and commercial Pt/C, respectively. The eminent ORR performance of PtCu/NC is attributed to the high specific area of NC and electron-rich Pt sites enhanced by electron transfer from the N and Cu atoms. Moreover, PtCu/NC exhibited better catalytic stability than PtCu/XC-72 and Pt/C after 3000 potential cycles, attributed to the interaction between the N atom and PtCu alloy.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Huimin Li,Zheng Si,Jinli Zhang,Yan Fu,Wei Li
Worm-like PtCu x alloys were synthesized through the co-reduction of H 2 PtCl 6 and CuCl 2 in ethylene glycol under the orientation of pyrolyzed alginic acid sodium (PA), in order to disclose the growth mechanism of different metallic compounds. Through the characterizations of FTIR, Raman, XRD , XPS , TEM , etc., it illustrates that with the orientation of oxygen-containing functional groups in the support PA, the preferentially reduced Pt clusters accelerate the formation of metallic Cu clusters and then worm-like bimetallic PtCu x alloys are generated with plenty of surface defects . The synthesized PtCu 3 /PA exhibits the highest content of metallic Pt 0 (67.11 at%), the average width about 2.19 nm, the lattice strain of −1.18%, as well as the excellent performance for methanol electrooxidation . It has the best CO tolerance ability and the optimal mass activity of 1.922 A mg Pt −1 , which is more than four times of the commercial Pt/C. This work discloses an intriguing growth pathway of PtCu x nanoparticles but also a facile route to synthesize bimetallic alloys with more electrocatalytic activity .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Yangyang Ren,Beibei Li,Guichao Zhang,Zunming Lu,Lanlan Li,Xiaojing Yang,Xinghua Zhang,Xiaofei Yu
Improvement in the durable and active low-Pt nanocatalysts for oxygen reduction reaction (ORR) is the essential target for clean energy. Herein, an efficient CeO 2 supported PtCu alloy catalyst (PtCu/CeO 2 -C) for ORR in acid media is developed. The CeO 2 support can effectively anchor the PtCu particles and inhibit their migration during the long-life cycling, which is beneficial to the catalytic performance. According to the electrochemical experiments, the specific and mass activities of PtCu/CeO 2 -C are 1.09 mA cm −2 and 0.49 A mg Pt −1 at 0.9 V, which are 9.9 and 6.1 times as large as that of Pt/C, demonstrating its outstanding ORR activities in acid media. Moreover, the theoretical studies confirm that oxygen vacancies (V O ) as Lewis acid sites can facilitate the adsorption and dissociation of O 2 , regulate the electronic structure of Pt, and thus endow PtCu/CeO 2 -C with an efficient 4-electron ORR pathway. The results suggest that the rational design of supported Pt-based catalysts is of great significance for efficient ORR reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jinghua Li,Jianbo Zhang,Xibin Jiao,Jiahua Shi,Jiangxue Ye,Kena Song,Jianfeng Bao,Guangda Li,Kun Lei
In this work, near-infrared (NIR) light driven concave octopod PtCu alloy nanocages (OPtCu-NCs) were fabricated and first developed as photothermal synergetic Fenton catalyst for degradation of pollutant dyes. Moreover, by irradiating with NIR laser (808 nm), the obtained OPtCu-NCs exhibit excellent NIR absorption capacity and thus produce hyperpyrexia over 50 °C. Concomitantly, by the photothermal effect, the OPtCu-NCs nanocatalysts was used for elimination of organic dyes such as Methylene blue (MB) and Rhodamine B (RhB). The NIR-driven photothermal degradation mechanism under NIR irradiation can be attributed to the Fenton-like catalytic performance of Cu ions , then -N C- and/or C-C bonds in the molecular skeleton were fractured and electrons were donated intensively. As confirmed by a typical radical trapping experiment, electrons trigger the formation of miscellaneous reactive species (O 2 - , HO 2 , especially •OH) subsequently . Moreover, the photothermal Fenton-catalytic activity of the as-prepared OPtCu-NCs had maintained at 93.15% (for MB) and 91.87% (for RhB) after ten circulating degradation processes. All acquired results reveal that the OPtCu-NCs have the potential applied value in dyestuff-wastewater treatment under neutral pH.
研究领域:
环境科学
·
纳米材料
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 12
·5244-5257
·
IF 4.5
Wei Na,Li Xiaoyuan,Yin Hongjie,Sun Yunyun,Jia Huimin,Guan Huijuan,Gao Yuanhao
The construction of nanozyme-based electrochemical sensor with excellent analytical properties is urgently needed for non-enzymatic electrochemical sensing of glucose. In this work, we embed PtCu alloy nanoparticles on mesoporous carbon nanospheres (PtCu/MCNs) as nanozyme by strong electrostatic adsorption (SEA) method combined with high-temperature reduction for glucose detection. Characterization results show that PtCu alloy nanoparticles with average diameter of 3.7 nm are homogeneously embedded on MCNs. The formation mechanism of PtCu/MCNs was put forward based on strong electrostatic interaction. PtCu/MCNs(1:1) shows the highest electrocatalytic activity for glucose oxidation compared with other PtCu/MCNs. PtCu/MCNs(1:1)-based sensor displays low detection limit (0.0005 μM), high sensitivity (574.1 μA mM −1 cm −2 ), wide linear range (1 μM–5 mM), high selectivity and anti-interference for glucose analysis. Moreover, the as-constructed sensor has excellent reusability and stability. The above superior properties could be attributed to the homodisperse and firm combination with MCNs of small PtCu alloy nanoparticles, and the cooperative effect of Pt with Cu. The PtCu/MCNs(1:1)-based sensor exhibits satisfactory properties for the detection of glucose in beverages, indicating the application prospects of PtCu/MCNs for glucose determination in real samples. Graphical abstract
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 11
·1-10
·
IF 2.127
Duan Wanyi,Li Aoqi,Chen Yujuan,Zhuo Kelei,Liu Jianming,Wang Jianji
In this work, a facile one-pot solvothermal method is developed for fabricating hollow spherical PtCu alloy nanoparticles (with the size of 124 ± 16 nm) supported on reduced graphene oxide (PtCu/rGO), with the assistance of 1-decyl-3-methylimidazolium bromide ([C 10 MIm]Br) as the structure-directing agent and capping agent. The influence of various experimental parameters on the morphology and structure of prepared PtCu/rGO hybrids is researched. Compared with the commercial Pt/C (10 wt%) and Pt/rGO, the as-prepared PtCu/rGO hybrid exhibits a larger electrochemical active surface area, higher electrocatalytic activity, and better tolerance for methanol oxidation in acidic media. We believe that the hollow spherical PtCu alloy supported on rGO will have great potential applications for direct methanol fuel cells.
Hollow spherical PtCu alloy supported on rGO hybrid is successfully synthesized by a facile one-pot solvothermal method with the assistance of 1-decyl-3-methylimidazolium bromide. 1-Decyl-3-methylimidazolium bromide acts as both shape-controlled agent and capping agent for synthesizing PtCu/rGO. The as-prepared PtCu/rGO exhibits high electrocatalytic activity and good poisoning-resistant ability for methanol oxidation in acidic media.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Xiaoli Qin,Yan Yin,Huijing Yu,Wenjuan Guo,Meishan Pei
An ultrasensitive electrochemical aptasensor for the quantitative detection of kanamycin antibiotic was fabricated based on a novel signal amplification strategy. This aptasensor was developed using thionine functionalized graphene (GR-TH) and hierarchical nanoporous (HNP) PtCu alloy as biosensing substrates for the first time. HNP-PtCu alloy with controllable bimodal ligament/pore distributions was successfully prepared by two-step dealloying of a well-designed PtCuAl precursor alloy combined with an annealing operation. GR-TH composite was synthesized by one-step reduction of graphene oxide (GO) in TH solution. Greatly amplified sensitivity was achieved by using GR-TH/HNP-PtCu composite owing to its large specific surface and good electron-transfer ability. Under the optimized conditions, the proposed aptasensor exhibited a high sensitivity and a wider linearity to kanamycin in the range 5×10 −7 –5×10 −2 μg mL −1 with a low detection limit of 0.42 pg mL −1 . This aptasensor also displayed a satisfying electrochemical performance with good stability, selectivity and reproducibility. The as-prepared aptasensor was successfully used for the determination of kanamycin in animal derived food.
研究领域:
分析化学
·
生物传感技术
·
食品安全检测
✓ 已验证
DOI
高影响因子
Advanced Healthcare Materials
·
2025
·
IF 9.6
Kexin Meng,Yao Shen,Dongni Hou,Hanbing Hu,Shouzhi Yang,Ziyue Zhang,Ayizekeranmu Yiming,Dingyitai Liang,Weibin Tian,Ludan He,Shuoyan Wei,Ying Wang,Jie Shen,Yuanlin Song,Sai Gu,Haiyang Su,Jian Zhou,Kun Qian
Rapid and accurate recognition of severe community-acquired pneumonia (CAP) would facilitate the optimal intervention. Currently, the diagnosis of severe CAP is commonly based on the criteria established by Infectious Disease Society of America (IDSA)/American Thoracic Society (ATS), which include 2 primary and 9 secondary criteria, making the process cumbersome and time-consuming. Here, a porous PtCu alloy-assisted laser desorption/ionization mass spectrometry (LDI MS) is designed for the extraction of plasma metabolic fingerprints (PMFs), coupling with machine learning for the diagnosis of severe CAP. The PtCu alloys with optimal particle size exhibit excellent sensitivity, reproducibility, and universality for metabolite detection, due to the porous structure, promising photoelectric effect, and improved melting surface structure. Further, the nanoplatform successfully records the PMFs within seconds, using only 0.5 µL native plasma. Machine learning of PMFs on 69 individuals produces a diagnostic model with an area under curve (AUC) of 0.832. Particularly, a three metabolic biomarker panel demonstrates enhanced diagnostic efficiency (AUC of 0.846), outperforming reported biomarkers (AUC of 0.560–0.770). Notably, the diagnosis can be completed in ≈35 min. The work affords a rapid and precise method for CAP management through metabolite analysis.
研究领域:
医学诊断
·
代谢组学
·
材料科学
·
人工智能
✓ 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）