International Journal of Electrochemical Science
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2023
·
IF 1.5
Zhentao Li,Yanhui Fu,Qingsheng Zhu,Saijin Wei,Jie Gao,Yifu Zhu,Ting Xue,Ling Bai,Yangping Wen
Phosphorene (BP) is a rapidly rising star in two-dimensional (2D) layered nanomaterials beyond graphene, and its urgent issues of ambient instability still have to be resolved. Here, the bimetallic Pt-Pd nanoparticle on the BP surface was employed as multifunctional chemical and biochemical sensing platform for electrocatalytic detection of p -aminophenol (PAP), β-galactosidase (β-Gal), and Escherichia coli ( E. coli ). The BP-supported Pt-Pd nanoelectrocatalyst obtained by the electrodeposition of bimetallic Pt-Pd nanoparticle onto the BP surface was very stable in aqueous buffer containing oxygen, which displayed good voltammetric responses for PAP in a linear range of 0.02 -5 μmol·L -1 with a detection limit (LOD) of 1.41 × 10 −8 M and sensitivity 115.81 μA·μM -1 ·cm -2 . PAP could be obtained by the biochemical reaction of β-Gal in the presence of substrate PAP-β-galactopyranoside, which could realize for biochemical sensing of β-Gal in a linear range of 0.2 -0.8 mU·L -1 with a LOD of 9.35 nU·L -1 and sensitivity of 4.77 μA (mU·L -1 ) -1 ·cm -2 . The β-Gal is an indicator of total coliforms represented by E. coli that are induced by isopropyl-β-thiogalactopyranoside, which could applied for biochemical sensing of E. coli in a linear range of 6 × 106 –1.6 × 108 cfu·mL-1 with LOD of 6.65 × 10 5 cfu·mL -1 and sensitivity of 2.44 μA·(cfu·mL -1 ) -1 ·cm -2 . This work will provide experimental support for multifunctional chemical and biochemical sensing platform based on 2D layered nanomaterials decorated with bimetallic nanoelectrocatalysts.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Xinyue Li,Hongjing Fei,Yanlin Zhang,Zheng Zhang,Huakang Zong,Bo Liu,Guotao Duan,Yuanyuan Luo
The detection of low-concentration hydrogen at room temperature is still a challenge, which contributes to taking precautions as soon as possible when hydrogen leaks. In this study, we prepared Pt/SnO 2 -Pd nanomaterial as nanoelectrode applied for a fuel cell-type hydrogen sensor with zero power consumption . The sensing results show that such fuel cell-type H 2 gas sensor has high selectivity and good sensitivity to H 2 gas, with an unprecedented low detection limit of 1 ppm, and the humidity has little impact on the sensor's performance. Based on DFT calculations, the low adsorption energy and the electron transfer interaction between Pd and H promote the adsorption and dissociation processes of H 2 molecules, which lead to the hydrogen oxidation reaction acceleration and shorter times of response and recovery. In addition, this Pt/SnO 2 -Pd based sensor has also advantages of high selectivity and zero-power consumption, which may provide a broad application prospect for fuel cell vehicles and voltage transformers, etc.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 20
·10927-10937
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IF 11.9
Jianyu Han,Zhixin Zhang,Zhuoran Xu,Lunhua He,Feiran Shen,Yehong Wang,Xuebin Liu,Meiling Guo,Zaihong Guan,Feng Wang
The interfaces in heterogeneous catalysts play an important role in their performances by either directly providing active sites through the synergistic effects from different catalyst compositions or indirectly modulating the state of active sites. However, constructing abundant interfaces in heterogeneous catalysts is a key scientific challenge since it requires the high dispersion of all catalyst compositions involved in substrate activation. A surface reduction strategy is proposed as the solution for this challenge, which creates a pyramid-type catalyst, (Pt/4nmCeO2)/SiO2, with maximized interfacial Pt–CeO2 sites as an example. Pt is chemically bound in surface reductive centers of 4 nm CeO2 nano-islands, generating stable Pt2+ sites with moderate hydrogenation capacity compared to Pt0 sites on bulk CeO2 and SiO2. This work facilitates the development of heterogeneous catalysts by presenting a high level of controlling the local chemical environment within nanomaterials.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2023
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IF 11.4
Nini Zhang,Xiangmei Li,Yanglong Guo,Yun Guo,Qiguang Dai,Li Wang,Wangcheng Zhan
Crystal engineering of metal oxide supports represents an emerging strategy to improve the catalytic performance of noble metal catalysts in catalytic oxidation of chlorinated volatile organic compounds (CVOCs). Herein, Pt catalysts on a TiO2 support with different crystal phases (rutile, anatase, and mixed phase (P25)) were prepared for catalytic oxidation of 1,2-dichloroethane (DCE). The Pt catalyst on P25-TiO2 (Pt/TiO2-P) showed optimal activity, selectivity, and stability, even under high-space velocity and humidity conditions. Due to the strong interaction between Pt and P25-TiO2 originating from the more lattice defects of TiO2, the Pt/TiO2-P catalyst possessed stable Pt0 and Pt2+ species during DCE oxidation and superior redox property, resulting in high activity and stability. Furthermore, the Pt/TiO2-P catalyst possessed abundant hydroxyl groups, which prompted the removal of chlorine species in the form of HCl and significantly decreased the selectivity of vinyl chloride (VC) as the main byproduct. On the other hand, the Pt/TiO2-P catalyst exhibited a different reaction path, in which the hydroxyl groups on its surface activated DCE to form VC and enolic species, besides the lattice oxygen of TiO2 for the Pt catalysts on rutile and anatase TiO2. This work provides guidance for the rational design of catalysts for CVOCs.
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PubMed
高影响因子
ACS Omega
·
2023
·
IF 4.1
Muhua Chen,Peng Chen,Zhen Ji,Min Yu,Jihuai Tan,Bo Fu,Xinbao Zhu
The hydrosilylation reaction driven by a homogeneous catalyst has been widely used in the industrial synthesis of functionalized silicone compounds. However, the homogeneous catalyst for hydrosilylation has the shortcomings of nonrecyclability, undesirable side reactions, and high cost. In this work, a highly efficient heterogeneous catalyst was prepared by loading Pt ions on MIL-88 modified with trimethoxy[3-(phenylamino)propyl]silane. In comparison with previous research studies, the resulting catalyst can exhibit high catalytic activity and excellent stability during the hydrosilylation reaction, which was attributed to the presence of a pyrrolic nitrogen structure between TPA-MIL-88 and the Pt ion. Besides them, 1.2%Pt/TPA-MIL-88 showed the highest catalytic activity and can be reused five times without significant deactivation. Importantly, 1.2%Pt/TPA-MIL-88 also achieved satisfactory results when it was used to catalyze the hydrosilylation reaction for other olefins, implying great potential for application in the silicone industry.
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Catalysts
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2023
·Vol. 13
·期 4
·676
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IF 3.9
Linlin Li,Yuxi Liu,Jiguang Deng,Lin Jing,Zhiquan Hou,Ruyi Gao,Hongxing Dai
Pt nanoparticles and a CeMnOxcomposite were loaded on the surface of the natural diatomite material to generate the Pt/CeMnOx/diatomite using the redox precipitation and impregnation methods. The physicochemical properties of the catalysts were characterized by means of various techniques. The catalytic properties and resistance to H2O and SO2of the catalysts were measured for the oxidation of typical volatile organic compounds (i.e., toluene and ethyl acetate). Among all of the as-prepared samples, Pt/CeMnOx/diatomite exhibited the highest catalytic activity: the temperatures (T90%) at a toluene or ethyl acetate conversion of 90% were 230 and 210 °C at a space velocity (SV) of 20,000 mL g−1h−1, respectively, and the turnover frequency (TOFPt) at 220 °C was 1.04 μmol/(gcats) for ethyl acetate oxidation and 1.56 μmol/(gcats) for toluene oxidation. In particular, this sample showed a superior catalytic activity for ethyl acetate oxidation at low temperatures, with itsT50%being 185 °C at SV = 20,000 mL g−1h−1. In addition, the Pt/CeMnOx/diatomite sample possessed good sulfur dioxide resistance during the toluene oxidation process. In the presence of SO2, some of the SO2molecules were adsorbed on diatomite, which protected the active sites from being poisoned by SO2to a certain extent. The pathways of ethyl acetate and toluene oxidation over Pt/CeMnOx/diatomite or Pt/CeMnOxwere as follows: The C–C and C–O bonds in ethyl acetate are first broken to form the CH3CH2O* and CH3CO* species or toluene is first oxidized to benzaldehyde and benzoic acid, and all of these intermediates are then converted to CO2and H2O. This work can provide a strategy to develop efficient catalysts with high catalytic activity, durability, low cost, and easy availability under actual working conditions.Keywords:Ce–Mn composite oxide;supported platinum catalyst;volatile organic compound;ethyl acetate oxidation;toluene oxidation;sulfur dioxide resistance
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RSC Advances
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2019
·Vol. 9
·期 2
·924-930
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IF 3.049
Fei Zeng,Zengju Fan,Shanshan Wu,Xing Cheng,Yanqing Tian
A new type of biocompatible and photo-polymerizable hydrogel with oxygen sensors for microengineering was developed. Herein, a red emitter as an oxygen probe which was chemically immobilized in a poly(2-hydroxyethyl methacrylate)-co-polyacrylamide-based matrix was expected to monitor cell metabolism. A few micropatterned films with gratings (5, 7, 10, 20, and 50 μm in width, respectively and with 1.2 μm in height) were designed and fabricated by photo-lithography using these hydrogels. SEM and AFM were used to validate these films to attain their lateral width and vertical depth. The oxygen responses of these films were characterized. Results showed that patterned films exhibited higher sensitivity than the non-patterned films. The films' construction can also have some influence on cell alignment and elongation. This phenomenon was evaluated by culturing human cervical cancer cells (HeLa cells) and mouse embryo fibroblasts (3T3-L1), on the film surfaces with different construction. Linear correlation between cell elongation and the logarithm of grating width was observed. Real-time monitoring of oxygen consumption of HeLa cells in cell culture medium was achieved. This study is expected to have potential to be applied in micro-structured design and to help understanding metabolism.
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MICROCHIMICA ACTA
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2019
·Vol. 186
·期 2
·1-8
·
IF 5.479
He Baoshan,Yan Sasa
A signal-on aptasensor is described for the voltammetric determination of kanamycin (KANA). Au@Pt core-shell nanoparticles with large surface and good electrical conductivity were synthetized and act as both a conductive material and as the carrier for complementary strands (CS2) and thionine (TH). In the presence of KANA, the electrochemical response of TH changes due to hybridization between CS1 immobilized on the electrode and the Au@Pt-CS2/TH system. The peak current increases linearly with the logarithm of the KANA concentration in the range from 1 pM to 1 μM, and the limit of detection is 0.16 pM. The sensor was characterized in terms of selectivity, reproducibility and stability, and satisfactory results were obtained. It was also utilized for the determination of KANA in (spiked) chicken samples. The recoveries (95.8–103.2%) demonstrate the potential of the method for KANA detection in real samples.
A signal-on aptasensor for kanamycin (KANA) was developed by using Au@Pt core-shell nanoparticles as nanocarrier for probe aptamer and as a sensing probe.
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Nano Research
·
2019
·Vol. 12
·期 4
·869-875
·
IF 8.515
Long Yan,Li Jian,Wu Lanlan,Wang Qishun,Liu Yu,Wang Xiao,Song Shuyan,Zhang Hongjie
The Pt-Ni nanoframe catalysts have attracted great interest owing to their unique electronic structure and excellent catalytic performance. However, the stability of the tenuous edges of nanoframe-structures is dissatisfactory and their universal applications in catalytic market beyond electrocatalytic reactions are yet to be tapped and explored. Herein, we developed a new core@shell structured Pt-Ni nanoframe@CeO 2 (Pt-Ni NF@CeO 2 ) composite via etching the Ni from inhomogeneous Pt-Ni rhombic dodecahedra (Pt-Ni RD) by cerium(III) acetate hydrate (Ce(OAc) 3 ). In this path, Pt-Ni RD was used as self-sacrificial template, while the Ce(OAc) 3 serves as the provider of the Ce 3+ source and OH − for the formation of CeO 2 shell, etchant of Pt-Ni RD, and the surface modification agent. By this way, the etching of Pt-Ni RD and the formation of the CeO 2 shell are simultaneously proceeded to form the final Pt-Ni NF@CeO 2 in one step. The obtained Pt-Ni NF@CeO 2 exhibits strong interfacial charge transfer interaction between Pt-Ni NF core and CeO 2 shell even without reduction treatment, leading to enhanced catalytic activity in the hydrogenation of phenylacetylene. After introduction of trace silver, the Pt-Ni-Ag 4.9 NF@CeO 2 achieves remarkable catalytic performance for the selective conversion of phenylacetylene to styrene: high conversion (100%), styrene selectivity (86.5%), and good stability. It reveals that encapsulation noble metal nanoframes into metal oxide to form core@shell structured hybrids will indeed enhance their stability and catalytic properties. Particularly, this work expends the application of noble metal nanoframes materials to hydrogenation reactions.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
·
IF 3.141
Tai Thien Huynh,Hau Quoc Pham,At Van Nguyen,Long Giang Bach,Van Thi Thanh Ho
Developing robust catalysts is still challenging for further commercialization of low-temperature fuel cell technologies. In this study, we introduce platinum nanocatalyst loading on Ti0.7Ir0.3O2 to assemble a robust Pt/Ti0.7Ir0.3O2 catalyst toward the methanol oxidation reaction (MOR) in direct methanol fuel cell systems. These observational results demonstrated that the Pt/Ti0.7Ir0.3O2 catalyst is a promising anodic electrocatalyst due to the superior electrocatalytic activity and durability toward MOR, which was exhibited from the onset potential of ∼0.1 V and high current density of ∼21.69 mA/cm2 versus that of the state-of-the-art Pt/C (E-TEK) catalyst. We also demonstrated the electronic transfer from the Ti0.7Ir0.3O2 catalyst support to Pt NPs resulting in the modified surface electronic structure of Pt NPs, which could be the reason for the high activity and durability of the Pt/Ti0.7Ir0.3O2 catalyst. In addition, this approach could supply a promising potential catalyst for fuel cell technology and other applications such as solar cells, biosensors, and water splitting.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Changhao Feng,Zhongwei Jiang,Jingxuan Wu,Bin Chen,Geyu Lu,Chengzhi Huang
In this work, Pt-Cr 2 O 3 -WO 3 composite nanofibers have been designed by using Pt@MIL-101(Cr) and electrospinning. The morphological and microstructural properties of these nanofibers were analyzed by various kinds of techniques. The FESEM and TEM results demonstrate that the size of Pt nanoparticles is ˜ 3 nm, which greatly improved the gas sensing properties of metal oxides. The gas-sensing properties of WO 3 , Cr 2 O 3 -WO 3 and Pt-Cr 2 O 3 -WO 3 composite nanofibers were tested. Compared with pristine WO 3 nanofibers, Pt-Cr 2 O 3 -WO 3 composite nanofibers exhibit superior response toward xylene. At the optimal operating temperature of 325 °C, the response of Pt-Cr 2 O 3 -WO 3 composite nanofibers to 10 ppm xylene is 74.3, the response time is 5 s and the detection limit is 0.5 ppm. The sensing mechanism of the ultrahigh gas sensing properties attributes to the Cr 2 O 3 -WO 3 heterojunction, the catalytic activity of Cr 2 O 3 , porous structure, the electronic and chemical sensitization of Pt nanoparticles.
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ACS Catalysis
·
2019
·
IF 12.221
Yaqi Liu,Hong-Yan Ma,Da Lei,Lan-Lan Lou,Shuangxi Liu,Wuzong Zhou,Gui-Chang Wang,Kai Yu
The aerobic oxidation of alcohols and aldehydes over noble metal catalysts is a critical reaction for the catalytic conversion of carbohydrates into value-added chemicals from biomass. However, to fully understand the reaction mechanism, in particular, the role of O2 and the generated active oxygen species in these reactions is still a challenging target. In the present work, the sub-10 nm Pt nanocrystals with cubic (Pt-NCs), octahedral (Pt-NOs), and spherical (Pt-NSs) morphologies were synthesized and used as catalysts in aerobic oxidation of 5-hydroxymethyl-2-furfural (HMF). Through experimental and computational investigations, the facet-dependent O2 conversion pathway and catalytic oxidation performance were discussed. The molecular O2 tends to be dissociated to generate •OH on a Pt(100) surface but prefers to be reduced to •O2– on a Pt(111) surface. Moreover, Pt-NCs enclosed by the {100} facets exhibited significantly enhanced catalytic activity compared to Pt-NOs enclosed by the {111} facets and Pt-NSs, in particular, for the alcohol oxidation step. On the basis of the experimental data and density functional theory (DFT) calculations, an active oxygen species promoted dehydrogenation mechanism for aerobic oxidation of HMF was proposed. The dehydrogenation of the alcohol group is more favorable on the Pt(100) surface with assistance of •OH, which is the dominant active oxygen species on the Pt(100) surface. We anticipate that this work would provide new insight into the role of active oxygen species in aerobic oxidation of alcohols and aldehydes over noble metal catalysts.
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