JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Na Cheng,Ling Zhang,Yingjie Zhou,Shengwei Yu,Liyuan Chen,Haibo Jiang,Chunzhong Li
To balance the Pt utilization and the durability is the key issue for developing Pt-based oxygen reduction reaction (ORR) catalysts, and constructing ultrathin one-dimensional (1D) structure provides a practical solution. Here, a facile CO-assisted strategy has been proposed for synthesizing PtFe nanowires (NWs) with an ultrathin diameter of one-nanometer and high aspect ratio for the first time, which demonstrates great universality and can be extended to a ternary system. The NWs are found to grow following an oriented attachment mechanism facilitated by the preferential adsorption and reducibility of CO . Based on composition regulation, PtFe NWs and PtFeCo NWs exhibit superior catalytic performance, of which the electrochemical active surface areas are extremely high, achieving 1.5 folds of that of Pt/C catalyst. Benefiting from the synergistic effect endowed by alloying and the ultrathin anisotropic structure, PtFe NWs and PtFeCo NWs show remarkable mass activity of 0.57 and 0.58 A mg -1 Pt , respectively, and the durability also meet the 2020 standard of DOE, holding great application potential.
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高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 27
·5903-5911
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IF 5.344
Qingfei Zhang,Gaizhen Kuang,Dongfang Zhou,Yanxin Qi,Mingzhe Wang,Xiaoyuan Li,Yubin Huang
Endo/lysosomal escape and the subsequent controllable/precise release of drugs and genes are key challenges for efficient synergistic cancer therapy. Herein, we report a photoactivated polyprodrug nanoparticle system (PPNPsiRNA) centered on effective light-controlled codelivery of Pt(IV) prodrug and siRNA for synergistic cancer therapy. Under green-light irradiation, PPNPsiRNA can sustainedly generate oxygen-independent azidyl radicals to facilitate endo/lysosomal escape through the photochemical internalization (PCI) mechanism. Besides, concurrent Pt(II) release and siRNA unpacking could occur in a controllable manner after the decomposition of Pt(IV), main chain shattering of photoactivated polyprodrug and the PPNPsiRNA disassociation. Based on these innovative features, excellent synergistic therapeutic efficacy of chemo- and RNAi therapies of PPNPsiBcl-2 could be achieved on ovarian cancer cells under light irradiation. The facile synthesized and prepared photoactivatable polyprodrug nanoparticle system provides a new strategy for effective gene/drug codelivery, where controllable endo/lysosomal escape and the subsequent drug/gene release/unpacking play vital roles, which could be adopted as a versatile codelivery nanoplatform for the treatment of various cancers.
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Catalysis Science & Technology
·
2021
·Vol. 11
·期 15
·5250-5259
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IF 6.119
Zhiyang Zhang,Wenlong Xu,Xiaomei Ye,Yonglan Xi,Cunpu Qiu,Liping Ding,Gui Liu,Qingbo Xiao
Enclosing metal clusters in zeolites can enhance their catalytic performance due to the complex effects of the zeolitic environment. However, for the first time, herein, we report the significant passivation effects of the surrounding zeolitic framework on the d-band center and catalytic performance of enclosed Pt clusters. For the dehydrogenation of propane to propylene, the Pt/NaX catalyst with Pt clusters on the exterior of X-zeolite showed a ∼1100% enhancement in TOF and largely improved selectivity for propylene compared with the corresponding Pt@NaX catalyst, in which the Pt clusters were stuck to the inside of X-zeolite. Moreover, less coke deposition and high stability were detected in Pt/NaX after the reaction for 18 h. Combining the detailed experiments and DFT calculations, it was revealed that the significant passivation effect is mainly attributed to the surrounding zeolitic framework for the enclosed Pt clusters, which decreases the d-band center of the Pt clusters and weakens the activation of propane, preventing the desorption of propylene with a reduction in propylene selectivity and increase in coke deposition. Thus, the present investigation reveals that enclosing metal clusters in zeolites may not be beneficial for some specific catalytic reactions, deepening the understanding for this type of catalyst of metal clusters enclosed in zeolites.
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BIOELECTROCHEMISTRY
·
2021
·
IF 5.373
Fenglin Zhang,Zhiguang Liu,Yujie Han,Lifang Fan,Yujing Guo
Carcinoembryonic antigen (CEA) is considered as a disease biomarker, which is related to various cancers and tumors in the human bodies. Sensitive detection of CEA is significant for clinical diagnosis and treatment. Herein, we proposed an electrochemical aptasensor for CEA detection based on the amplification driven by polydopamine functional graphene and Pd-Pt nanodendrites ( [email protected] /Pd-PtNDs), conjugated hemin/G-quadruplex (hemin/G4), which possess mimicking peroxidases activity. Firstly, [email protected] was modified on the electrode surface for fixing CEA aptamer 1 (Apt1). Then, [email protected] /Pd-PtNDs with large surface area served as matrix for immobilization of hemin/G4 to obtain the secondary aptamer. In virtue of the sandwich-type specific reaction between CEA and the corresponding aptamers, the second aptamer was captured on the sensing interface, which can catalyze the oxidation of signal probe hydroquinone (HQ) with H 2 O 2 and amplify current signal. Furthermore, the electrochemical signals of HQ were proportional with CEA concentrations. Under the optimal conditions, a dynamic response range from 50 pg/mL to 1.0 μg/mL and a detection limit of 6.3 pg/mL for CEA were obtained. Moreover, the proposed strategy represented satisfactory sensitivity and stability, and showed a good precision in real samples application.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Kaiyi Su,Yehong Wang,Chaofeng Zhang,Zhuyan Gao,Jianyu Han,Feng Wang
Herein, we reported the tuning of dominant products in the photocatalytic hydrogen transfer reaction over Pt/Nb 2 O 5 photocatalysts, using a support-induced modification strategy. In the photocatalytic conversion of phenylacetylene with ethanol as a probe reaction, the dominant product was styrene over Pt/2D Nb 2 O 5 nanoplates; in contrast, H 2 was the main product over the Pt/bulk Nb 2 O 5 . Compared to the metallic Pt species over bulk Nb 2 O 5 , the positively charged Pt (Pt δ+ ) species over 2D Nb 2 O 5 nanoplates contributed to the reduction of phenylacetylene, which was revealed by CO adsorbed Fourier transform infrared spectra. Furthermore, the present Pt δ+ species were due to the formation of Pt δ+ –O–Nb structure via oxygen transfer of 2D Nb 2 O 5 nanoplates, which was verified by the results of X-ray photoelectron spectra and H 2 temperature-programmed reduction. This work sheds light on the design and application of Nb-based catalysts in the transfer hydrogenation of organics in photocatalysis.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Chaozhu Huang,Jingwei Zhao,Fengdong Qu,Jiacheng Wang,Minghui Yang
Hydrogen sulfide (H 2 S) is considered a highly hazardous toxic gas. H 2 S sensors are therefore of paramount significance for real-time leak detection. However, existing solutions do not meet the strict performance targets set by stakeholders, while deactivation due to surface area of sensing materials decrease and contamination is a widely unsolved problem. Presented here is a new support material, mesoporous niobium nitride (NbN), which improve the long-term stability largely via enhancing the interaction between metal and support. Simultaneously, sensor devices using NbN as support show enlarged sensitivity, enhanced limit of detection and well repeatability when compared with these sensors using traditional carbon black support. In a wider perspective, our work suggests strategies for enhancing long-stability of next-generation chemical gas sensors by optimizing metal-support interaction.
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Journal of Physical Chemistry C
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2021
·
IF 4.126
Chen Ding,Zijie Mao,Jia-Shun Liang,Xianxian Qin,Qing Zhang,Fan Yang,Qing Li,Wen-Bin Cai
The commercialization of proton exchange membrane fuel cells (PEMFCs) calls for the development of active and durable Pt-based catalysts for oxygen reduction reaction (ORR) by means of a cost-effective and environmentally benign protocol. We report herein an all aqueous phase preparation of carbon supported Au-modified Pt–Co alloy catalyst (Au/Pt–Co/C), which involves the dimethylamine borane co-reduction of aqueous Pt(II) and Co(II) precursors to form a Pt–Co/C catalyst and the ethanol reduction of an aqueous Au(III) precursor to form Au/Pt–Co/C. This Au/Pt–Co/C catalyst not only shows a greatly enhanced ORR activity like the homemade Pt–Co/C and state-of-art Pt–Co/C(com) catalysts as compared to the Pt/C catalyst but also exhibits a much higher durability over the Pt/C(com), homemade Pt–Co/C, and state-of-art Pt–Co/C(com) catalysts in accelerated degradation tests (ADTs) with both half-cell and single-cell configurations. Specifically, the maximum power density of a PEMFC involving the Au/Pt–Co/C cathode suffers only a 6% loss after 30 000 cycles of a standard ADT while that involving the state-of-art Pt–Co/C(com) suffers a 37% loss. This research provides an alternative route to prepare efficient and durable Pt-based ORR catalysts toward a widespread application of PEMFCs.
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Nanomaterials
·
2019
·Vol. 10
·期 1
·30
·
IF 4.034
Sibei Zou,Mingyuan Zhang,Shengpeng Mo,Hairong Cheng,Mingli Fu,Peirong Chen,Limin Chen,Wei Shi,Daiqi Ye
Herein, to investigate the pore effect on toluene catalytic oxidation activity, novel supports for Pt nanoparticles—ZSM-5 foam (ZF) fabricated using polyurethane foam (PUF) templates and pore-modified ZSM-5 foam (ZF-D) treated by acid etching, comparing with conventional ZSM-5 and pore-modified ZSM-5 (ZSM-5-D), were successfully synthesized. Pt nanoparticles were loaded on series ZSM-5 supports by the impregnation method. The Pt loaded on ZF-D (Pt/ZF-D) showed the highest activity of toluene catalytic combustion (i.e., T90= 158 °C), with extraordinary stability and an anti-coking ability. Based on various catalysts characterizations, the unique macropores of ZF facilitated the process of acid etching as compared to conventional ZSM-5. The mesopores volume of ZF-D significantly increased due to acid etching, which enlarged toluene adsorption capacity and led to a better Pt distribution since some Pt nanoparticles were immobilized into some mesopores. Specifically, the microporous distribution was centered in the range of 0.7–0.8 nm close to the molecular diameter of toluene (ca. 0.67 nm), which was key to the increasing toluene diffusion rate due to pore levitation effect of catalysts and accessibility of metal. Furthermore, the reducibility of Pt nanoparticles was improved on Pt/ZF-D, which enhanced the activity of toluene catalytic oxidation.Keywords:hierarchically porous zeolite foam;Pt nanoparticles;diffusion;acid etching;catalytic combustion of toluene
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yunshi Liu,Xiupeng Liu,Yubing Wang,Rui Wang,Tong Zhang
A novel synthesis of In 2 O 3 porous microcolumnar structures (MCs) by a self-sacrificial template route was carried out using MIL-68. Using a modified calcination strategy, the samples could maintain the original metal organic frame work (MOF) morphology with a high gas accessibility after a slow decomposition of organic ligands. Pt nanoparticles (NPs) were loaded on the samples before or after the MOF calcination, leading to different contact states of the Pt NPs and In 2 O 3 matrix. The gas sensing properties of the samples were systematically investigated using a dynamic testing system. Particularly, sample Pt/In 2 O 3 MCs-1 exhibited a superior NO 2 sensing performance near room temperature ( R g / R a = 44.9 at 1 part-per-million and 5.2 at 100 parts-per-billion (ppb)). The sensor resistance could recover to its baseline even at 40 °C after purging with air without any additional treatment. This can be attributed to the chemical sensitisation of the Pt NPs as well as large contents of pores and channels for gas diffusion. The introduction of humidity in the gas mixture could remarkably decrease the sensor response and recovery times owing to the ‘wet’ NO 2 adsorption mechanism. This study demonstrated a novel synthesis route of Pt-loaded In 2 O 3 porous columnar structures and its potential applications in near-room-temperature detection of ppb-level NO 2 .
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JOURNAL OF NANOPARTICLE RESEARCH
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2019
·Vol. 21
·期 2
·1-13
·
IF 2.009
Li Fang,Huang Haibao,Li Guisheng,Leung Dennis Y. C.
Highly ordered TiO 2 nanotube arrays (TiO 2 NTs) were synthesized by anodization method using a titanium foil and further modified with nanoparticles ( Ø = 2~10 nm) of three platinum group metals (that is, platinum, palladium, and ruthenium) through potentiostatic pulsed electrodeposition method to obtain the composite material. Compared with pure TiO 2 NTs, all the three composite samples (M-TiO 2 NTs, M = Pt, Pd, Ru) showed different enhancement effects on the light responses, as well as different photoelectrochemical performances. In this study, the performance of M-TiO 2 NTs, which worked as photoanode and cathode, was investigated. Ru-TiO 2 exhibited the best degradation yield (~ 85.8%) when applied as photoanode under visible light illumination, which indicated the platinum group metal could also be induced under visible irradiation, not just served as the co-catalyst. M-TiO 2 NTs as cathode were evaluated under the hydrogen evolution reaction (HER). The three M-TiO 2 NT electrodes showed an improved efficiency over pure TiO 2 NTs, while Pt-TiO 2 NTs performed even better (without any sacrificial agent) with higher Faradic efficiency than platinum electrode in the photoelectrocatalytic hydrogen production, which could be explained by the uniform and fine metal nanoparticles on the surface of TiO 2 NTs to offer abundant active sites for the reaction.
In this paper, TiO2 nanotube arrays loaded with nanoparticles of platinum group metals have been explored on their enhancement of photoelectrocatalytic activity. Platinum group metals served as co-catalyst in the surface of TiO2 nanotubes and show great variations in different reactions.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Rong Dai,Ziliang Zheng,Wenjun Yan,Chenshuai Lian,Xu Wu,Xia An,Xianmei Xie
The critical problem facing catalysts for the LT-ESR is deactivation owing to sintering of the active metal and carbon deposition. To solve this problem, a dragon fruit-like Pt-Cu@mSiO 2 catalyst for LT-ESR reaction has been successfully fabricated by a facile encapsulation strategy. Structural and morphological analysis shows that the Pt-Cu@mSiO 2 nanocomposite (approximately 400 nm) has a uniform dragon fruit-like structure, with well crystallized Pt-Cu alloy nanoparticles (about 50 nm) embedded in the mSiO 2 . Benefiting from the unique components and architectural features, the dragon fruit-like Pt-Cu@mSiO 2 nanocomposite with optimal Pt/Cu ratio present superior performance than that of Pt@mSiO 2 , Cu@mSiO 2 and supported Pt-Cu/mSiO 2 catalysts in terms of activity, H 2 selectivity, and stability in the LT-ESR reaction. Moreover, the synergistic effect of platinum and copper can substantially decrease the CO concentration. It is crucial that the mesoporous SiO 2 shell not only make the embedded Pt-Cu alloy nanoparticles easily accessible but also effectively prevent leaching and aggregation of active sites as well as spatially suppress the carbon deposition on the active surface, thus maintain a good catalytic activity during the 150 h stability test at 400 °C.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Qi Lian,Han Liu,Xuefang Zheng,Xiaoming Li,Fengjie Zhang,Jing Gao
A general method for the preparation of Pt doped CuO/Pt nanoflowers (CuO/Pt NFs) for peroxidase mimicking has been demonstrated via hydrothermal method . Pt ions could be reduced to Pt nanoparticles by using the ascorbic acid (AA) as reducing agent and Pt ions were uniformly doped in the CuO nanoflowers by using the bovine serum albumin (BSA) as the stabilizer . The obtained CuO/Pt NFs exhibited a higher peroxidase-like catalytic activity than individual CuO and Pt nanoparticles alone, which could be ascribed to their synergistic effect. In the presence of hydrogen peroxide (H 2 O 2 ), the CuO/Pt NFs could catalyze the oxidation of chromogen 3,3′,5,5′-tetramethylbenzidine (TMB) to a blue color product. The peroxidase activity of CuO/Pt NFs was selectively inhibited by Hg 2+ due to form the CuO/Pt-Hg trimetallic amalgam . However, the inhibition was not affected by other metal ions . Therefore, a novel colorimetric biosensor was developed for sensitive detection of mercuric ions by using CuO/Pt NFs. This method exhibited a wide response linear range, low limit of quantification values, excellent sensitivity and selectivity for detection of Hg 2+ in various ground water samples, which was verified with CVAAS. With the advantages of rapid response, simple operation, naked-eye observation and low cost, the colorimetric CuO/Pt NFs sensor showed bright prospects for detection of Hg 2+ in various water samples and public drinking water distribution systems .
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