Chemistry-An Asian Journal
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2020
·Vol. 15
·期 20
·3356-3364
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IF 4.056
Kai Liu,Zixi Lyu,Xuejiao Chen,Xinyan Liao,Guanhong Chen,Xin Lin,Wei Wang,Shuifen Xie
Graphical A selective synthesis of atypical Rh−Pt alloyed nanocrystals with different morphologies and defective structures has been achieved through kinetically manipulating the nucleation and nucleus attachment. The defective Rh 47 Pt 53 wavy nanowires endowed with abundant grain boundaries and twin boundaries present a superior electrocatalytic performance for the ethanol oxidation reaction. Defective metal nanostructures have attracted great attention due to the striking catalytic behavior of the defect sites. Atypical metal nanocrystals generated from attached nuclei can accommodate abundant grain boundaries (GBs) and twin boundaries (TBs). However, the understanding of their growth-mechanism and precisely synthetic control over such defective nanocrystals are still scarce. Herein, using the Rh−Pt nanoalloy as a model system, we systematically demonstrate that a prudent control of the reaction kinetics can manipulate the metal nucleation and nucleus attachment to create atypical nanocrystals, including small isolated nanoparticles (NPs), defect-rich wavy nanowires (WNWs), and {100} facet-bounded spliced nanocubes (SNCs). In the ethanol oxidation electrocatalysis, the Rh 47 Pt 53 WNWs featured with abundant TBs and GBs show the greatest mass activity (0.655 A ⋅ mg −1 Pt , 2.9 times to the commercial Pt/C) and durability. Our work captures the core of reaction kinetics on regulating the nucleus attachment and enables the rational control over the nanocrystal morphology and defect.
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JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 26
·11829-11840
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IF 3.553
Xie Wenwen,Huang Zeai,Wang Ruiqi,Wen Cheng,Zhou Ying
Photocatalytic production of green oxidation reagents as an economical and environmental-friendly process is a promising strategy to replace the traditional production processes. In the present study, a series of 1.0 wt% Pt/WO 3 photocatalysts with different surface chemical states of Pt were successfully fabricated. The different surface metallic Pt (Pt 0 ) and oxidized Pt (PtO x ) ratios on WO 3 showed significant effects on the photocatalytic activities for strong oxidants of peroxydisulfate ( \( {\text{S}}_{ 2} {\text{O}}_{8}^{2 - } \) ) and hydrogen peroxide (H 2 O 2 ) formations. It is proposed that surface Pt 0 and PtO x functioned as reduction site for O 2 reduction to H 2 O and oxidation site for H 2 O oxidation to H 2 O 2 , respectively, during the photocatalytic process. As a result, a higher surface composition of Pt 0 prepared using photodeposition (PD) method led to the formation of higher amount of \( {\text{S}}_{ 2} {\text{O}}_{8}^{2 - } \) . On the other hand, PtO x -loaded WO 3 using impregnation (IM) method showed significant formations of \( {\text{S}}_{ 2} {\text{O}}_{8}^{2 - } \) and H 2 O 2 simultaneously. This work provided a new idea for the design of noble metal Pt-supported WO 3 for efficiently photocatalytic generation of \( {\text{S}}_{ 2} {\text{O}}_{8}^{2 - } \) and H 2 O 2 .
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RSC Advances
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2019
·Vol. 9
·期 53
·31092-31101
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IF 3.049
Yu Wenlong,Chen Zhe,Yu Shitao,Ding Junwei,Shan Yuling,Liu Fusheng,Li Ming
Nanoporous carbon (NPC) derived from waste polyethyleneterephthalate (PET) bottles was prepared by a MgO-templated method and employed as a support for a highly dispersed platinum catalyst. The NPCs and Pt/NPCs catalysts were characterized by BET, SEM, TEM, XRD and ICP-OES. The catalytic performance of the NPC supported Pt catalysts for reductive alkylation of p-aminodiphenylamine (p-ADPA) with methyl isoamyl ketone (MIAK) was investigated. The textural properties of the NPC prepared could be tailored by changing the size of the MgO-template and the MgO/waste PET powder mass ratio. When the pore size was below 14 nm, the catalytic performance of the Pt/NPCs for the reductive alkylation could be improved with increasing the pore size of the NPCs. Profiting from the higher mechanical strength and the ideal pore structure, Pt/O@NPC50(1/1)–PTA had excellent reusability, which could maintain 98% conversion of p-ADPA after reused 10 times.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Peilong Li,Xiaoyu Hu,Zexuan Zhang,Xin Zhang,Ning Zeng,Cun Hu,Bin Yu,Xuanhao Hu,Jiangfeng Song,Yan Shi,Linsen Zhou,Wenhua Luo
Metal-support interaction plays a key role and remains a challenge in exploring highly efficient heterogeneous catalysts, especially for hydrophobic catalysts in Liquid Phase Catalytic Exchange (LPCE) process for water detritiation. In this work, supported Pt catalysts using layered double hydroxides (LDHs) as supports are featured by highly dispersed Pt nanoparticles, water resisting property, and strong interaction of Pt with LDHs, exhibiting excellent anti-aggregation of Pt nanoparticles and catalytic performance over traditional Pt/C at high temperature and humidity conditions. Density Functional Theory calculations show that there is strong interaction between Pt nanoclusters and hydrogen defective LDHs surface, together with significant interfacial charge transfer and metal electronic structure modification, which can restrain the aggregation of Pt on LDHs and enhance catalytic activity. These findings are helpful to deepen understandings of the effects of metal-support interactions in LPCE process, which shed valuable insights for the design and preparation of highly-efficient hydrophobic catalysts on LDHs with prospective applications in water detritiation.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Weiguo Wang,Rongkai Du,Changzhi Dong,Jinwu Yan,Lei Zhang
A sensitive enzyme-linked immunosorbent assay (ELISA) has been developed based on the dual catalysis of dendritic Pd-Pt porous nanoparticles and horseradish peroxidase (HRP). The Pd-Pt porous nanoparticles, for the first time, were used to immobilize HRP. As a proof-of-concept demonstration, HRP functioned Pd-Pt porous nanoparticles were applied in hCG detection with a detection limit of 0.07 IU L −1 . The linear intervals is 0.1–6.4 IU L -1 . The Pd-Pt-HRP possesses a better sensitivity than the traditional BA-ELISA. Furthermore, the precision and reproducibility and selectivity were assessed to be eligible for the hCG monitoring.
研究领域:
生物化学
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医学诊断
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纳米技术
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RSC Advances
·
2021
·Vol. 11
·期 54
·34355-34368
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IF 3.361
Qiuyue Ding,Wumin Zhang,Yuanyuan Zhu,Lu Wang,Xinyuan Feng,Yanyan Xi,Xufeng Lin
Catalytic Fenton oxidation is an effective way to remove organic pollutants in water, and the performance of the catalyst is a key issue for the competiveness of this method. In this work, various supported bimetallic Pt–Cu catalysts were prepared by different impregnation methods and their performances for catalytic Fenton oxidation of aniline in water were investigated. In the different impregnation methods employed, factors including the reduction method of the metal precursor, type of catalytic support, and loading of metal were investigated. The effect of different reduction methods on actual loadings of the active components on the supported Pt–Cu catalysts showed the order of (i) H2 reduction > (ii) liquid phase methanal reduction. Meanwhile, compared with the monometallic catalysts, the Pt–Cu alloy phase (mainly in the form of PtCu3) was generated and the specific surface area was significantly reduced for the bimetallic catalysts. In the process of Fenton catalytic oxidation of aniline, it was found that most of the prepared catalysts had a certain catalytic activity for H2O2 accompanied with aniline degradation. It was found that Pt0.5Cu1.5/AC (where AC denotes activated carbon) exhibited superb catalytic activity compared with all other prepared catalysts. In particular, aniline was almost completely mineralized in a neutral solution (500 mg L−1 aniline, 0.098 mol L−1 H2O2) after 60 min at 50 °C using Pt–Cu/AC (Pt: 0.5%, Cu: 1.5%). The characterization results showed that the Pt and Cu components were rather evenly distributed on the AC support for this catalyst. More importantly, there was an obvious synergic effect on the supported bimetallic catalyst between the Pt and Cu components for the catalytic oxidation of aniline.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
·
IF 3.898
Xinyu Yang,Zezhi Chen,Huijuan Gong
Catalytic oxidation of CH 4 has been proved to be an attractive option for landfill gas (LFG) upgrading. However, coking of catalysts in catalytic LFG deoxygen has been clearly observed in industrial applications. In this regard, it is necessary to investigate whether coke deposition originates from CH 4 or volatile organic compounds present in LFG, and the influence of coke deposition on catalytic performance. Herein, we evaluate the LFG deoxygen on Pt/γ-Al 2 O 3 catalyst in simulated LFG (CH 4 , CO 2 , O 2 , N 2 ) and its co-feed with representative volatile organic compounds, ethylbenzene , toluene, benzene and cyclohexane . The results show that the coking of the catalyst is originated from volatile organic compounds rather than CH 4 . The Pt/γ-Al 2 O 3 catalyst does not deactivate during LFG deoxygen process, even significant amount of coke deposited, up to 18.15% (mass). Characterization analyses reveal that although coke deposition overall covers the catalyst surface, resulting in mesopores blockage and a reduced number of accessible Pt sites, however, the coke formed, H-rich carbonaceous components, behaves as counterpart for O 2 elimination. Besides, the coke deposited is mainly filamentous. Thus, coke formation has little negative effect on the overall catalytic performance of Pt/γ-Al 2 O 3 catalyst ultimately. The results obtained in this work are helpful for the rational design of robust Pt based catalysts for LFG deoxygen without undue attention to their coking properties, and also favor the innovation of more attractive purification scheme configurations.
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RARE METALS
·
2021
·Vol. 41
·期 2
·630-638
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IF 4.003
Qiu Jia-Jun,Yang Ting-Ting,Li Yi-Fan,Qian Wen-Hao,Liu Xuan-Yong
Although titanium and its alloys are extensively used in orthopedics and dentistry fields, implant failures still happen because of implant-associated infections. Herein, Au@Ag@Pt core–shell nanorods with noble metal combination were fabricated and assembled on medical titanium surface and the antibacterial activity and biocompatibility were investigated. The results showed that antibacterial rates of Ti–Au@Ag@Pt against S. epidermidis and P. aeruginosa were 89.7% and 92.7%, respectively. Besides, Ti–Au@Ag@Pt showed no obvious cell toxicity with MC3T3-E1 cells grew well on the sample surface. It was discovered that the Pt shell layer on Ti–Au@Ag@Pt slowed down the Ag ion release rate which endowed medical titanium surface with both antibacterial activity and good biocompatibility. Graphical abstract
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ACS Catalysis
·
2026
·
IF 13.6
Yang Pan,Zhou Xiaomei,Hou Yufeng,Guan Qingxin,Li Wei
Competitive H 2 oxidation severely limits CO 2 selectivity (typically <50%) during preferential CO oxidation (CO-PROX) on Pt catalysts. While metal–oxide interfaces can potentially circumvent this trade-off, constructing architectures that spatially decouple CO and H 2 activation remains challenging. Here, we report a junction-confined FeO-Pt/SiO 2 catalyst in which FeO species selectively decorate Pt nanoparticles, creating well-defined and closely contacted interfacial sites. Unlike randomly distributed FeO in conventional catalysts, this configuration enables electron redistribution from Pt to FeO, as revealed by Bader charge analysis. This electronic effect preserves strong CO adsorption on Pt (required for CO activation) while dramatically enhancing O 2 activation at the interface. Consequently, CO oxidation proceeds via a dominant low-barrier interfacial pathway (0.20 eV), while weakened H 2 adsorption at the FeO–Pt junction mitigates competitive H 2 oxidation under H 2 -rich conditions. The catalyst achieves >70% CO 2 selectivity at complete CO conversion over 80–160 ° C and maintains stability for 100 h without noticeable deactivation under H 2 -rich conditions. This work demonstrates that precise spatial organization of metal–oxide interfaces can effectively decouple competitive reaction pathways, offering a generalizable strategy for designing selective oxidation catalysts beyond CO-PROX.
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Food Chemistry-X
·
2026
·
IF 9.2
Jiaxuan Tang,Wenru Wang,Weina Yu,Qiuran Wang,Yunxuan Li,Conglin Feng,Jianhang Yang,Yifei Pan,Xiaodong Cao,Shudong He,Yuhan Sun,Yongkang Ye,Haisong Zheng
Herein, Mn-doped carbon dots (Mn-CDs) were prepared and used as a reducing agent to reduce PtCl 6 2− to platinum nanoparticles (Pt NPs), forming a stable nanozyme of Mn-CDs@Pt NPs. The prepared Mn-CDs@Pt nanozyme exhibited high oxidase-like activity toward the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) with a low Michaelis-Menten constant ( K m ) value of 0.0545 mM and a high maximum initial velocity ( V max ) value of 3.42 × 10 −7 M s −1 . By exploiting the excellent oxidase-like activity of Mn-CDs@Pt nanozyme and combining the thiol-ene Michael addition between glutathione (GSH) and acrylamide (AA), a sensitive colorimetric detection interface for AA was fabricated. Using UV–vis measurement, the colorimetric sensor for AA detection displayed a broad linear detection range from 0.05 to 5000 μM and a detection limit (LOD) of 0.0371 μM. In addition, a smartphone-assisted detection of AA yielded a linear range from 5 to 5000 μM with an LOD of 4.35 μM. The colorimetric sensor was applied for AA detection in real samples, achieving satisfactory recoveries in the range of 94.8–110.4%. Moreover, the detection results of AA in real samples were in good consistency with those detected using the standard method of HPLC, suggesting that the proposed colorimetric method possesses potential for AA detection in food safety and quality monitoring.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Shuaiqi Zhao,Jiajin Lin,Wenqiang Gong,Aihua Xu,Xiaoxia Li,Yongcai Qiu
Pt-based catalysts are one of the most extensively used heterogeneous catalysts for the degradation of pollutants, and regulating electron-metal-support interaction (EMSI) is an efficient strategy to enhance the performance of Pt-based catalysts. Herein, we introduced a quenching technique for regulating the EMSI of Pt-CuO/CeO 2 catalysts to significantly boost its CO catalytic activity. The EMSI optimized by quenching was determined to promote the electron redistribution between Pt and CuO/CeO 2 via Cu–O-Pt structure, thus forming more electron-rich Pt species and enhancing the surface oxygen species activity. From comprehensive characterization investigations, we confirmed that the superior activity arouse from the moderate Pt 0 /Pt 2+ ratio, in which CO molecules were preferentially adsorbed on the electron-rich Pt sites and reacted with active oxygen species from PtO x or CuO/CeO 2 , accelerating the whole CO catalytic process. Our finding provided a new inspiration to control EMSI of Pt-based catalysts and widened the application of quenching chemistry in heterogeneous catalysis.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 44
·16345-16355
·
IF 4
Shuyue Xie,Fangfei Liu,Tursun Abdiryim,Xiong Liu,Ruxangul Jamal,Yanyan Song,Mariyam Niyaz,Yajun Liu,Hujun Zhang,Xinsheng Tang
Exploiting high-efficiency and durable electrocatalysts toward the methanol oxidation reaction (MOR) is crucial for the advancement of direct methanol fuel cells (DMFCs). Herein, we demonstrate the loading of platinum–palladium bimetallic nanoparticles (Pt–Pd NPs) onto poly(3,4-ethylenedioxythiophene) (PEDOT)-embellished titanium carbide (Ti3C2Tx) nanosheets as the electrocatalyst (Ti3C2Tx/PEDOT/Pt–Pd) via a facile and rapid chemical reduction-assisted one-pot hydrothermal process. The structural and morphological analyses of Ti3C2Tx/PEDOT/Pt–Pd indicate that the three-dimensional (3D) hybrid structure formed between PEDOT and Ti3C2Tx provides a sizable active surface and more active sites, which enhances the homogeneous dispersion of the Pt–Pd NPs and facilitates mass transfer. The Schottky junctions formed between PEDOT and Pt–Pd NPs contribute to charge transfer. The electronic effects and synergistic interactions between the support and catalyst favor the electrocatalytic activity of the catalyst. The electrochemical test results reveal that the Ti3C2Tx/PEDOT/Pt–Pd catalyst has prominent electrocatalytic capability for the MOR. Compared with Ti3C2Tx/Pt–Pd and commercial Pt/C catalysts, the Ti3C2Tx/PEDOT/Pt–Pd catalyst has a larger electrochemical activity surface area (ECSA = 122 m2 g−1) and higher mass activity (MA = 1445.4 mA mg−1), as well as better CO tolerance and more reliable long-term durability (a peak current density retention of 71% after 5200 s).
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