JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Jingjing Zheng,Xiaotian Li,Bo Zhang,Xiaoxin Zou,Qihua Liang,Hui Chen,Guo-Dong Li
The concentration of acetone in exhaled breath is an efficient indicator for the diagnosis of diabetes. However, it is difficult to detect acetone in exhaled breath due to the extremely low acetone concentration, rather complex composition and very high humidity. Herein, we report Pt-decorated foam-like Ga-In bimetal oxide nanofibers (Pt-GIO) for trace concentration acetone detection. We found that the Pt-GIO based sensor exhibits enhanced sensing response towards acetone compared with that of Ga-In bimetal oxide (GIO), due to the formation of Schottky contact between Pt and n-type GIO, leading to the increased chemisorbed oxygen. As a result, the Pt-GIO based sensors gives a high response (3.2), short response time (13 s) to 1.8 ppm acetone and very low detection limit (300 ppb). The Pt-GIO sensor also gives good stability and is nearly insensitive to moisture in the range of 40% RH to 95%. These advantages including high response, low detection limit, short response time and high moisture resistance endow Pt-GIO a promising sensing material for acetone detection in exhaled breath.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 5
·052507
·
IF 4.316
Qingchun Wang,Zihao Wang,Xiaolong Liang,Shengli An,Changkun Cai,Yuanyuan Liu,Jinxiao Bao,Xiwen Song
Spherical CeO2 and CeO2-ZrO2 solid solutions are prepared using a hydrothermal method, Pt/CeO2-ZrO2/GO and Pt-CeO2/GO catalysts are prepared using graphene as a carrier, and the effects of the addition of a CeO2-ZrO2 solid solution on the electrocatalytic activity, stability and anti-CO poisoning performance of methanol fuel cell anodes are investigated. The catalyst samples are characterized via X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the electrochemical properties of the catalysts are investigated using an electrochemical workstation (IVIUM). The results show that Pt/CeO2-ZrO2/GO has a higher electrocatalytic activity and stability against CO oxidation than Pt-CeO2/GO, Pt/GO and commercial Pt/C catalysts, which is attributed to ZrO2. When Zr4+ is added into the CeO2 lattice, the activity of oxygen in the CeO2 lattice, the oxygen mobility and the oxygen vacancies are increased, the oxygen storage capacity is improved, and the intermediate product of CO is more easily oxidized. This finding indicates that Pt/CeO2-ZrO2/GO is a methanol oxidation anode catalyst with a good catalytic activity, stability and resistance to CO poisoning.
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高影响因子
ACS Omega
·
2021
·
IF 3.512
Hanhan Wang,Jun Zhao,Chuang Liu,Yuping Tong,Weiwei He
Metal nanozymes hold promise for chemical and biological applications, and their implementation relies on high catalytic efficiency and stability. Using the metal–organic framework as an ideal carrier for well-dispersed ultra-small metal nanoparticles (NPs) is beneficial for improving the catalytic efficiency of nanozymes. In this study, a zirconium-based metal organic framework (UiO-66) with good chemical stability and high porosity was synthesized and used to construct Pt/UiO-66 nanocomposites. The percentage of Pt in UiO-66 can be tuned easily by adjusting the feeding amount of PtCl42–. Because of the confinement effect of mesopores, the Pt particles with an average diameter of 3.8 nm are formed and dispersed throughout the pores of the UiO-66 particle. The Pt/UiO-66 composites show efficient oxidase- and peroxidase-like activity. Both the oxidase- and peroxidase-like activities are dependent on the Pt percentage. Pt/UiO-66-6% exhibits enhanced peroxidase-like activity, ∼3.9 times higher than that of commercial Pt/C with 10 wt % Pt. We propose that the construction of Pt/UiO-66 increased the utilization efficiency and stability of Pt NPs and provided more active sites for catalytic reactions. Using the peroxidase-like activity of Pt/UiO-66, a colorimetric method that can be used for actual blood glucose detection was developed for the specific detection of glucose with a limit of detection of 0.033 mM.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2021
·
IF 8.271
Yuxiang Liao,Jun Li,Shiming Zhang,Shengli Chen
Alloying and nanostructuring are two strategies used to facilitate the efficient electrocatalysis of the oxygen reduction reaction (ORR) by Pt, where the high index surfaces (HISs) of Pt exhibit superior activity for ORR. Here, we report the fabrication of PtCu 3 nanodendrites possessing rich spiny branches exposing n (111) × (110) HISs. The dendrites were formed through an etching-modulated seeding and growing strategy. Specifically, an oxidative atmosphere was initially applied to form the concaved nanocubes of the Pt-Cu seeds, which was then switched to an inert atmosphere to promote an explosive growth of dendrites. Separately, the oxidative or inert atmosphere failed to produce this hyperbranched structure. Electrochemical dealloying of the PtCu 3 nanodendrites produced Pt 3 Cu shells with Pt-rich surfaces where HIS-exposed dendrite structures were maintained. The resulting PtCu 3 @Pt 3 Cu@Pt nanodendrites in 0.1 M HClO 4 exhibited excellent mass and area specific activities for ORR, which were 14 and 24 times higher than that of commercial Pt/C, respectively. DFT calculations revealed that Cu alloying and HISs both contributed to the significantly enhanced activity of Pt, and that the oxygen binding energy on the step sites of HISs on the PtCu 3 @Pt 3 Cu@Pt nanodendrites approached the optimal value to achieve a near peak-top ORR activity.
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高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2020
·
IF 5.627
Fuchang Gao,Zuwei Xu,Haibo Zhao
In this paper, flame spray pyrolysis (FSP) is used to synthesize Pt/TiO 2 catalysts with surface-supported isolated Pt atoms through elaborate precursor/solvent formulation and flame temperature history control. It is a pivotal factor to this FSP process that there is a major distinction on saturated vapor pressure between two components (Pt species and Ti species), and thereby they exist as gas phase and particle phase at a certain temperature range, respectively. When the flame is quenched to ambient temperature with cold sheath gas , Pt species of gaseous PtO 2 (being in the vapor phase above 723 K) condense into deposition state on the surface of TiO 2 nanoparticles . Combined with X-ray photoelectron spectroscopy (XPS) analysis and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) detection, we identify that Pt atoms are dispersed and anchored on the catalyst surface . Single-atom Pt dispersed Pt/TiO 2 catalysts can be well achieved by controlling the loading at a very low level, which offers an effective way to maximize the atom economy for surface catalysis of scarce noble metals. In this work, considering that Pt as the best co-catalyst of hydrogen evolution, the FSP-made Pt/TiO 2 catalysts are tested in a photocatalysis water splitting system aiming to a simple and attractive means of renewable hydrogen production . The highest activity presents in 0.1Pt/TiO 2 with 0.1% molar ratio of Pt to Ti, reaching 108.5 times of the benchmark sample from commercial flame-made TiO 2 (P25). The high activity is attributed to the fact that the isolated Pt atom serves as the main active site for photocatalysis hydrogen evolution. Therefore, the performance and cost efficiency of catalysts are greatly improved by the FSP, mainly ascribed to engineering atomically dispersing Pt on the support surface.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Dengfeng Wu,Wei Zhang,Aijun Lin,Daojian Cheng
Developing highly active and durable electrocatalysts with low levels of Pt content toward some crucial reactions including oxygen reduction reaction, hydrogen evolution reaction, and methanol oxidation reaction in an acidic electrolyte environment are desirable but still an open challenge for clean and efficient energy conversion. Herein, we present a facile route to synthesize low Pt-content ternary PtNiCu nanostructures with hollow interior and accessible surfaces (H-PtNiCu-AAT NPs) as enhanced multifunctional electrocatalysts. The galvanic replacement reaction and atomic diffusion between in situ preformed CuNi nanocrystals and Pt species should be responsible for the formation of hollow PtNiCu NPs. Continuous activation by acid picking and annealing treatments were performed to leach out the excessive Cu and Ni on the surfaces and to enrich Pt-content on the surface. H-PtNiCu-AAT NPs exhibit excellent activity and durability toward HER, ORR, and MOR due to the rational integration of multiple structural advantages. Strikingly, the mass activity and specific activity of H-PtNiCu-AAT NPs (0.977 A mgPt–1 and 1.458 mA cm–2) is 7.1 and 6.9 times higher than that of commercial Pt/C (0.138 A mgPt–1 and 0.212 mA cm–2) toward ORR at 0.9 V (vs RHE), respectively. This present work provides an efficient strategy for the design of low Pt-content trimetallic electrocatalysts with excellent activity and durability.
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Junjie Tang,Peiwen Liu,Xiaoling Liu,Lei Chen,Haimeng Wen,Yu Zhou,Jun Wang
Straightforward encapsulation of Pt clusters (∼2 nm) into the pure silica TON-type zeolite (ZSM-22) was reached in a dry gel conversion route, where the ionic liquid template was removed via the hydrocracking-calcination-reduction approach. The obtained Pt@ZSM-22 series possessed high crystallinity, large surface area, and ultrafine Pt clusters inside the zeolite crystals. They exhibited remarkable activity in the semi-hydrogenation of phenylacetylene into styrene; the lead sample with 0.2 wt % Pt loading afforded a large turnover number up to 117,787. The preferential high affinity of the pure silica ZSM-22-encapsulated Pt clusters toward the substrate phenylacetylene rather than the hydrogenated product was derived from the unique space-confinement effect of zeolite microchannels, which is responsible for such excellent performance.
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高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
He Xiao,Jingjuan Zhang,Man Zhao,Jianchun Ma,Ya Li,Tianjun Hu,Zhanfeng Zheng,Jianfeng Jia,Haishun Wu
A simple method for preparation of Pt, CQDs-coloaded graphene composite for hydrogen evolution reaction (HER) is established by electrolysis-solvothermal process. Graphene is obtained by electrochemical exfoliation of graphite in cathode, while carbon quantum dots (CQDs) and Pt nanoparticles (NPs) are in-situ generated in the electrolyte simultaneously. CQDs are evolved from propylene carbonate solvent and Pt NPs are derived from reduction of Pt intermediate species generated from anodic dissolution of Pt counter electrode during electrolysis process. Then Pt NPs and CQDs are well dispersed on graphene at subsequent solvothermal process. Work voltage and electrolyte type as the key electrolysis conditions are applied to control the concentration of CQDs and Pt NPs, which decides electrochemically active surface area and HER activity of obtained catalysts. Significantly, the obtained superior catalyst with trace amount of Pt (0.145 wt%), shows markedly enhanced catalytic HER activity with mass activity of 37.5 A mg −1 at −50 mV in acidic solution, 68.2 times more active than Pt/C. This study provides a universal and promising methodology for synthesizing Pt, CQDs coloaded hybrid with the assistance of electric field as cost-effective catalysts for fuel cells.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xiao Chen,He Cao,Xiaozhen Chen,Yan Du,Ji Qi,Jingjie Luo,Marc Armbrüster,Changhai Liang
Intermetallic nanoparticles (NPs) with a well-defined atom binding environment and a long-range ordering structure can be used as ideal models to understand their physical and catalytic properties. In this work, several kinds of nanostructured and carbon nanotube (CNT)-supported Pt-based intermetallic compounds (IMCs) have been synthesized by one-step lithium naphthalenide-driven reduction at room temperature without the use of surfactants in light of the reduction potential of metals. In the chemoselective hydrogenation of cinnamaldehyde, the second metal in Pt-M IMCs significantly creates a suitable reaction environment through construction of a good geometric and electronic structure. The Pt3Sn/CNT catalyst presents highly efficient and good chemoselective hydrogenation of cinnamaldehyde to cinnamyl alcohol. This can be attributed to the fact that the incorporated Sn atoms effectively dilute large Pt ensembles and increase the electron density of Pt. The in situ-formed SnOx interfaces as Lewis acid sites facilitate the coordination of C═O bonds, enhancing the selectivity to cinnamyl alcohol. In addition, the SnOx interface as the joint between Pt3Sn IMCs NPs and CNTs significantly improves the stability of the catalyst in the reaction environment.
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高影响因子
CATALYSIS SURVEYS FROM ASIA
·
2020
·Vol. 24
·期 2
·104-114
·
IF 2.194
Yang Lijuan,Song Zhaoyang,Yu Yingmin,Zhu Lijun,Xia Daohong
A novel bimetallic bifunctional Pt–NiP/Hβ isomerization catalyst was successfully prepared by introducing a small amount of noble metal Pt into the NiP on the Hβ carrier. The catalyst demonstrated superior catalytic activity to Pt/Hβ and NiP/Hβ catalysts for n -hexane isomerization, due to the good surface property, the synergistic effect of the two metals, the suitable match between acid site and metal site, as well as good reduction stability. The effects of Pt loading and NiP addition amount on the surface property were studied comprehensively through a series of characterization, and the correlation among surface property with catalytic behavior was also analyzed. The results indicated that the Pt (0.1 mol%)–NiP (10 mol%)/Hβ catalyst had good structural characters, surface acid property and an uniform distribution of NiP and Pt active components on surface, which is helpful to obtain a highly efficient catalytic performance. Additionally, the influence of reduction/reaction conditions on the catalytic activity, as well as the catalyst tolerance to water and thiophene sulfur, was investigated furtherly.
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高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 4
·1-7
·
IF 6.232
Xie Zheng-Jun,Shi Mei-Rong,Wang Li-Ying,Peng Chi-Fang,Wei Xin-Lin
We report the first use of metallic nanozyme as colorimetric probe for Pb 2+ determination. The method is based on the surface leaching of Au@PtNP nanozyme by Pb 2+ -S 2 O 3 2− ions, accompanied by a decreased catalytic activity of the metallic nanozyme. To construct this colorimetric determination, the Pt deposition onto the AuNPs was carefully investigated and other experimental factors including kind of substrate and buffer were optimized. With increasing Pb 2+ concentration, the catalytic activity of the Au@PtNPs decreased gradually. As a result, the blue color at 650 nm from the oxidation of 3,3′,5,5′-tetramethylbenzidine by H 2 O 2 faded gradually. A determination limit of 3.0 nM Pb 2+ with a linear range from 20 to 800 nM was obtained. The assay demonstrated negligible response to common metal ions even at elevated concentrations. This colorimetric method was applied to the determination of Pb 2+ ions spiked in lake water samples, and good recoveries (96.8–105.2%) were obtained. The above results indicate the potential application of metallic nanozymes in developing robust colorimetric assays.
Schematic representation of the surface leaching of Au@PtNP nanozyme by Pb 2+ -S 2 O 3 2− ions, accompanying the decreased catalytic activity of the metallic nanozyme
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高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Chao Wang,Xiaodan Wang,Fengyu Lai,Zheng Liu,Ruohao Dong,Wen Li,Hongxia Sun,Baoyou Geng
Metal–organic framework (MOF)-derived materials have attracted increasing attention in the field of energy storage and conversion. Calcining MOFs to carbonized structures is a common route to obtain MOF-derived materials. However, the existing calcination conditions often cause the structural collapse and the specific surface area to be significantly reduced. In this work, we use argon–hydrogen mixed gas for calcination of MOFs to obtain a N-doped porous carbon material with excellent properties. Its BET specific surface area and pore volume up to 2476 m2 g–1 and 1.325 cm3 g–1, respectively, which are higher than those of the precursor ZIF-8 (1960 m2 g–1 and 0.687 cm3 g–1), perfectly inherited the rhombic dodecahedron morphology of the precursor. Hydrogen reduces the zinc in ZIF-8 at high temperature to evaporate, which avoids the carbothermal reduction reaction between the zinc component and the carbon framework of MOFs, protecting the framework of MOFs and leaving a lot of micropores, so that after the carbonization of MOFs it still has extremely high specific surface area and pore volume, even surpassing the MOFs precursors. We loaded Pt nanoparticles on the prepared porous carbon to catalyze the oxygen reduction reaction and showed an excellent half-wave potential of 0.883 V, which is 10 mV higher than that of the commercial Pt/C (Pt 20 wt %), while the Pt loading is only 8.66 wt %. The stability is also much better than Pt/C.
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