Fuel Cells
·
2018
·Vol. 18
·期 6
·763-770
·
IF 2.149
D.-H. Yang,X.-L. Sui,L. Zhao,G.-S. Huang,D.-M. Gu,Z.-B. Wang
A qualified support material for Pt must has numerous deposition sites for Pt nanoparticles and great electrical conductivity. Metal oxide materials are potential support materials for Pt nanoparticles. However, they have less deposition sites for Pt and worse electronic conductivity than carbon. Carbon over the surface of metal oxide materials can improve the above shortage. In this paper, antimony tin oxide (ATO) coated by carbon layer has been successfully prepared by plasma enhanced chemical vapor deposition method (PECVD). PECVD can provide a brief approach to enwrap metal oxide with carbon at low temperatures. Besides, it becomes easier to control the amount of carbon by the PECVD to create much more two-phase interface for Pt deposition. The carbon layer promotes the electronic conductivity of ATO and provides more deposition sites for platinum nanoparticles, which directly influence the size of Pt nanoparticles as well as the electrochemical active surface areas. The as-prepared catalyst exhibits excellent activity for methanol oxidation reaction (MOR), which is twice of that of the commercial Pt/C catalyst. Meanwhile, it has better stability than the commercial Pt/C.
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高影响因子
NANO
·
2013
·
IF 1.167
SHIYONG BAO,HAN ZHU,PAN WANG,MEILING ZOU,MINGLIANG DU,MING ZHANG
A facile and green route was introduced to synthesize Pt nanoparticles (PtNPs) immobilized on Cu 2 O octahedrons to form Cu 2 O – Pt hierarchical heterostructure. Transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) were employed to study their morphology, chemical and crystallographic properties of the Cu 2 O – Pt hierarchical heterostructure. These novel Cu 2 O – Pt hierarchical heterostructures show fascinating degradations of methylene blue (MB), due to the suppressed electron/hole recombination phenomena and the efficient ability to capture the light.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Kuang Sheng,Guang Li,Min Liu,Lei Gan,Shiqi Huang,Jie Li
Optimizing the accessibility and chemical microenvironment of Pt single atoms (SAs) is essential for enhancing the efficiency of hydrogen evolution reaction (HER). Herein, we present a hierarchical catalyst (Pt 3 /WC/HS) featuring highly accessible Pt SAs moderately coordinated with WC nanoparticles and uniformly anchored on monodisperse porous carbon nanospheres. With a Pt content of 2.8 wt%, Pt 3 /WC/HS achieves an ultralow overpotential of 8 mV at 10 mA cm −2 , outperforming commercial 20 wt% Pt/C. Additionally, the catalyst exhibits outstanding HER activity in proton exchange membrane water electrolyzers (PEMWE), simulated seawater, and neutral media. Notably, in a coal-assisted hydrogen production system that decouples oxygen evolution reaction (OER) from HER, Pt 3 /WC/HS achieves 400 mA cm −2 at an applied potential of just 0.5 V. Spectroscopic characterizations and density functional theory (DFT) reveal that WC stabilizes the Pt SAs while retaining an active electronic configuration in the Pt 5 d z 2 orbital, shifting *H adsorption from thermodynamically unfavorable to spontaneous. Moreover, the interconnected porous framework of Pt 3 /WC/HS ensures high Pt site accessibility at the three-phase interface. This work demonstrates a versatile and high-performance HER catalyst suitable for diverse hydrogen evolution systems and offers a rational design strategy for single-atom catalysts.
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DOI
PubMed
高影响因子
Scientific Reports
·
2014
·Vol. 4
·期 1
·1-6
·
IF 5.078
Han Lin,Liu Hui,Cui Penglei,Peng Zhijian,Zhang Suojiang,Yang Jun
Noble metal nanoparticles with hollow interiors and customizable shell compositions have immense potential for catalysis. Herein, we present an unique structure transformation phenomenon for the fabrication of alloy Cu 3 Pt nanoframes with polyhedral morphology. This strategy starts with the preparation of polyhedral Cu-Pt nanoparticles with a core-shell construction upon the anisotropic growth of Pt on multiply twinned Cu seed particles, which are subsequently transformed into alloy Cu 3 Pt nanoframes due to the Kirkendall effect between the Cu core and Pt shell. The as-prepared alloy Cu 3 Pt nanoframes possess the rhombic dodecahedral morphology of their core-shell parents after the structural evolution. In particular, the resulting alloy Cu 3 Pt nanoframes are more effective for oxygen reduction reaction but ineffective for methanol oxidation reaction in comparison with their original Cu-Pt core-shell precursors.
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DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2024
·
IF 4.4
Meng Zhang,Ying Zhang,Qianglong Xu,Xiaolan Li,Jing Chen,Hongpeng Jia
Energy shortage and environmental pollution problems force us to find low-energy consume methods to deal with volatile organic compounds (VOCs). In this work, Pt-P25 was synthesized through a simple wet impregnation method and calcination method. The study showed that different calcination temperatures and calcination atmospheres affected the activation state of Pt species, showing significant differences in the photothermal catalytic toluene oxidation reaction efficiency. The Pt-P25-800N sample activated in a nitrogen atmosphere at 800 oC exhibits better activity compared to other samples, achieving a toluene conversion rate of 95% and a mineralization rate of 65% under a light intensity of 400 mW/cm2. Characterization results demonstrate that low-valent Pt species are positively correlated with toluene oxidation activity and play a major role in the reaction. The ultraviolet (UV), visible (Vis) and infrared (IR) components in the spectrum all contribute to the toluene oxidation process. The catalytic bed is heated to the required temperature mainly through thermal effects and crosses the reaction energy barrier. The traditional photocatalytic process over TiO2 also plays an auxiliary enhancement role. Due to the efficient conversion capability of the active sites, Pt-P25-800N achieves long-term stability of at least 50 hours under low light intensity input and water vapor conditions, accompanied by minimal accumulation of intermediate products. The above results explain that the comprehensive effect between active Pt species and photothermal catalysis jointly achieves efficient degradation of VOCs and alleviates the energy and environmental crisis.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Rui Xu,Jingqi Bao,Ningru Xuan,Bingxin Zhou,Lingshan Liao,Qiusheng Zhou,Di Wu,Linfang Lu
The template sacrifice method is a pivotal strategy for synthesizing noble metal-based nanocrystals with enhanced catalytic properties. A critical limitation of this method lies in the challenges associated with regulating the morphology of the resultant nanocrystals. This study demonstrates that the morphology of PtCu nanocrystals can be effectively modulated by adjusting the pH in the Cu 2 O template sacrifice method. Various PtCu nanocrystals, including PtCu hollow nanoboxes and PtCu nanodendrites of differing sizes, have been successfully synthesized. Mechanistic investigations reveal that reduced pH corresponds to a lower electrode potential of Cu 2 O, which enhances its reducing capacity, thereby intensifying the galvanic replacement reaction with the Pt precursor. The driving force of Kirkendall effect during this process can be systematically manipulated via pH adjustments, leading to the generation of PtCu nanocrystals with diverse morphologies. The synthesized PtCu nanocrystals demonstrate significantly improved methanol oxidation reaction activity compared to commercial Pt/C. Specifically, the PtCu hollow nanoboxes exhibit a methanol oxidation reaction (MOR) activity of 1.93 A mg⁻¹, which is 5.4 times greater than that of the commercial Pt/C. Physical characterizations suggest that the superior catalytic performance of PtCu hollow nanoboxes catalyst is attributed to its increased surface electronic density of Pt resulting from the special hollow and porous morphology. The pH control strategy outlined in this research holds promise for the synthesis of other Cu-based nanoalloys with varying morphologies, and may be applicable to other catalytic systems.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Xuying Liu,Min Zou,Yehao Yu,Yuanrui Hai,Jinyan Huang,Yunchang Fan,Yulong Zhang,Yujing Weng,Yuhe Liao
Glycolic acid (GA), a versatile compound widely used in pharmaceuticals, cosmetics, and biodegradable polymers, requires efficient and sustainable synthesis methods to meet industrial demands. This study investigates the selective oxidation of glycolaldehyde (GD) and ethylene glycol (EG) to GA over a carbon-supported platinum (Pt/C) catalyst under alkali-free conditions. Complete GD conversion with exceptional GA selectivity (99.8%) was achieved under mild conditions (30 °C, 2.5 MPa air), while EG oxidation exhibited moderate conversion (∼60%) with >90% GA selectivity. Kinetic analysis revealed distinct oxygen pressure dependencies: GD oxidation exhibited strong oxygen sensitivity, as oxygen adsorption and activation were rate-determining, whereas EG oxidation was predominantly governed by substrate concentration due to the oxygen saturation on the Pt/C surface. Mechanistic studies identified GD as a key intermediate in EG oxidation, with overoxidation pathways limiting GA selectivity at higher temperatures and concentrations. Catalyst characterization demonstrated high Pt dispersion, stable surface chemistry, and structural durability, contributing to its superior performance. This work provides a green, efficient pathway for GA production, offering valuable insights into catalyst design and process optimization for sustainable chemical manufacturing.
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高影响因子
Journal of CO2 Utilization
·
2025
·
IF 8.4
Heng-Bo Zhang,Guo-Qing Yang,Jiageng Li,Zhong-Wen Liu
Transition metal is quantitatively investigated as a promoter of Pt-supported catalysts for the oxidative dehydrogenation of propane with CO 2 (CO 2 -ODP). However, the criteria for selecting the transition metal are largely from trial and error. In this work, Pt/SiO 2 catalysts promoted with 3d transition metals (TMs) of Mn, Fe, Co or Ni (PtTM/SiO 2 ) are comparatively studied for CO 2 -ODP. We found that the C 3 H 6 selectivity and conversions of propane and CO 2 are clearly improved when TMs are introduced into Pt/SiO 2 . Moreover, the apparent activation energy for the C 3 H 6 formation during CO 2 -ODP is decreased in the order of PtNi/SiO 2 > PtCo/SiO 2 > PtFe/SiO 2 > PtMn/SiO 2 . Among the investigated catalysts, PtMn/SiO 2 is the most active and selective catalyst for the activation of C-H bonds in propane to produce C 3 H 6 while PtNi/SiO 2 is the most favorable catalyst for the formation of by-products via the dry reforming of propane with CO 2 and propane cracking. Essentially, the catalytic results are well explained as the increased electron density of Pt over the PtTM/SiO 2 catalysts via the enhanced electron transfer from TM having a smaller electronegativity. This understanding is important for the rational design of a high-performance Pt-based bimetallic catalyst for CO 2 -ODP.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 26
·期 2
·481-490
·
IF 2.647
Jiang Li-Li,Zeng Min,Wang Chao-Yang,Luo Zhi-Hui,Li Hai-Yang,Yi Yong
Carbon-supported platinum-nickel alloy catalysts have become one of the main choices of proton exchange membrane fuel cells (PEMFCs) due to the high catalytic activity toward oxygen reduction reaction (ORR). In this work, carbon aerogel supported platinum-nickel solid solution alloy catalysts (Pt 3 Ni/CA) with small particles (~ 3.5 nm) and uniform distribution were prepared via a simple one-step rapid reduction method during which no structure guide or stabilizer is added. In rotating disk electrode (RDE), the mass activity (MA, 0.25 A mg Pt −1 ) and specific activity (SA, 4.69 A m −2 ) of the optimized Pt 3 Ni/CA catalysts for ORR are nearly 3.8 times and 6.5 times that of the state-of-the-art commercial carbon-supported platinum catalysts (Pt/C, 0.07 A mg Pt −1 and 0.72 A m −2 ), respectively. After the accelerated durability test (ADT), the as-prepared Pt 3 Ni/CA catalysts still keep a satisfactory MA and SA which are more than 3.4 and 8.9 times as high as that of Pt/C. The Koutecký-Levich (K-L) equation shows that the electrochemical reaction conforms to be a 4e − process.
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JOURNAL OF MATERIALS RESEARCH
·
2014
·Vol. 29
·期 23
·2863-2870
·
IF 1.815
Yun Zhang,Xiaomei Wu,Yanbao Fu,Weidian Shen,Xiaoqin Zeng,Wenjiang Ding
Our research aims at exploring a new oxygen reduction reaction (ORR) catalyst with effective catalytic capability, which can be used in the metal-air batteries. ORR electrocatalysts of carbon black and carbon aerogel supported Pt-based nanoparticles were synthesized by a chemical impregnation reduction method. The electrochemical measurement consisted of cyclic voltammetry (CV) and line scan of scanning electrochemical microscopy (SECM) conducted in alkaline medium as well as the single-cell tests. All the tests indicate that the Pt–Zn/carbon aerogel (Pt–Zn/CA) catalyst, with the specific discharge capacity reaching 1349.5 mA h g−1, exhibits the best catalytic performance among all the tested catalysts. The doping of Zn forms Pt-rich surface, creates more d-band vacancies, and reduces the leaching problem; the use of carbon aerogels brings larger specific surface area. These aspects have all improved the catalytic activity per unit mass.
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CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Yiqing Zeng,Yanan Wang,Yahan Meng,Fujiao Song,Shule Zhang,Qin Zhong
Herein, we compared the catalyst formation process of three Pt/TiO 2 catalysts prepared by impregnation (PtTi–I), deposition precipitation (PtTi–D) and photo-deposition (PtTi–P) to investigate its effect on oxgyen activation and toluene oxidation activity. The encapsulation of TiO 2 on Pt particles induced by high temperature strengthened the metal–support interaction (MSI) but inhibited the activation of oxygen over PtTi–I catalyst, thus it showed the poorest activity in toluene oxidation. Since the selective deposition of Pt on certain face of TiO 2 during photo-deposition process, PtTi–P exhibited stronger MSI and higher activity although it possessed much larger Pt particles than PtTi–D.
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Nano Research
·
2022
·Vol. 16
·期 4
·4643-4649
·
IF 10.269
Wei Qiulian,Sun Yunqiang,Wang Shan,Hu Zunfu,Liu Qingyun,Zheng Xiuwen
The construction of silicon-oxygen bonds has been highlighted as an exciting achievement in organosilicon and green chemistry, but their synthetic efficiency has great improvement potential, so it is crucial to explore and achieve an effective approach for synthesizing such compounds. In this study, we successfully prepared the highly dispersed platinum single-atom catalyst (Pt SAC/N-C) through a coordination-assisted strategy with a mixture of ligands (H 2 bpdc and H 2 bpydc), which were used for the O-silylation of alcohols with silanes. The strong coordination between Pt 2+ and the Pyridine N at the skeleton of UiO-67 plays a critical role in accessing the atomically isolated dispersion of Pt sites. Without the assistance of the H 2 bpydc ligands, the Pt/ UiO-67-bpdc precursor is prone to aggregation during the pyrolysis process, resulting in the formation of Pt nanoparticles. Aided by advanced characterization techniques of high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and X-ray absorption fine structure (XAFS) spectroscopy, it has been demonstrated that atomically dispersed Pt was formed on the UiO-67 through a local structure of four-coordinated Pt-N 4 , exhibiting a high actual Pt loading content (0.6962 wt.%). In the oxidation of silanes, the Pt SAC/N-C catalyst showed a high turnover frequency (TOF) value (up to 9,920 h −1 ) when the catalyst loading decreased to 0.005%. Excellent performance was maintained during recycling experiments, indicating high stability of the catalyst.
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