INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Junjie Ding,Li Ma,Mengyu Gan,Wang Zhan,Chenglong Zhou,Deying Wei,Sichen Han,Jun Shen,Fei Xie,Xiujuan Zhong
Limited by unsatisfactory mass diffusion and complex fabrication procedures, nanoporous carbons (NPCs) don't perform well, served as catalyst supports. Herein, utilizing nitrogen-doped carbon nanotubes (NCNTs) as spacers of nitrogen-doped graphene-like carbon nanosheets (NGs), a 3D nanoarchitecture (Co@NCNT-NG-900) is fabricated via a facile and eco-friendly approach. Physical characterizations manifest that the in situ-formed NCNTs make for improving graphitic degree, NGs contribute to increasing the specific surface area and the level of N-doping, meanwhile, the spacers effects of NCNTs promote the formation of opened macropores , what's more, Co@NCNT-NG-900 mainly consists of three-dimensional macropores and oversized mesoporous (3D macro-/oversized mesoporous), unlike conventional NPCs. Benefiting from improved charge transfer rate, enhanced N-doping level and dominant 3D macro-/oversized mesoporous, Co@NCNT-NG-900 is evaluated as an ideal Pt support for methanol oxidation reaction (MOR) in acid and alkaline medium . This work provides a facile synthetic method for NPCs and sheds directive light into the research of efficient catalysts for MOR.
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REACTIVE & FUNCTIONAL POLYMERS
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2019
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IF 3.074
Yixing Duan,Xu Xu,Li Zhou
Rapid and scalable preparation of polymer-based magnetic microcapsules (MMCs) without employing any templates and surfactants is still a challenge. Herein, we present a one-step template/surfactant-free strategy for fast and large-scale fabrication of poly(vinyl alcohol) (PVA)-based MMCs. The MMCs are formed from simultaneous creation of magnetic Fe 3 O 4 nanoparticles and crosslinking of PVA chains, which is achieved by simple addition of ammonia solution into the preformed water-in-oil (W/O) emulsion comprising castor oil , aqueous mixture of PVA and iron salts. The size and shell thickness of MMCs could be readily controlled by fine tuning the process parameters. Furthermore, this approach allows for incorporation of additional functional nanoparticles into the PVA shell of MMCs, as demonstrated by the fabrication of Pt nanoparticles decorated MMCs (Pt-MMCs) in this study. The Pt-MMCs displayed favorable catalytic activity for reduction of aromatic nitro compounds (e.g., 4-nitrophenol and 4-nitroaniline), and could be conveniently recycled using magnet and reused for > ten times without obvious decline of catalytic activity. This work thus opens a new pathway for facile fabrication of property-tailored MMCs to meet the requirements of various applications.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Weihua Zheng,Zhili Xiong,Haifeng Li,Shangmin Yu,Gengen Li,Liting Niu,Weilu Liu
A novel electrochemical sensor based on Pt@molecularly imprinted polymer (MIP) core-shell nanostructure was developed using a facile electrodeposition method. This unique core-shell nanostructure offered the advantages of large electrode surface area, regular morphology, high selectivity and sensitivity. The poly(3, 6-diamino-9-ethylcarbazole) based MIP shell acted as the recognition element, while the inner Pt nanoparticles acted as a catalytic center. The morphology of the core-shell nanostructure was observed by scanning electron microscopy and the electrochemical property was evaluated using cyclic voltammetry. The sensing performance of the Pt@MIP sensor was investigated using the analyte of bisphenol A (BPA). Influence of the polymerization conditions on the performance of the Pt@MIP sensor was investigated. Under the optimized condition, a wide linear range (0.007 μM ∼ 70 μM), a low detection limit (0.0032 μM) and a good selectivity were obtained for the detection of BPA. Finally, the sensor was applied to the detection of BPA in serum and drinking bottle samples with satisfying results.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
At Van Nguyen,Tai Thien Huynh,Hau Quoc Pham,Vi Thuy Thi Phan,Son Truong Nguyen,Van Thi Thanh Ho
Late transition metal doped TiO 2 has been exploited for generating efficient catalyst support by enhancing electrical conductivity and modifying properties of TiO 2 . The Ti 0·7 Ir 0·3 O 2 nanorod (NRs), a novel catalyst support for Pt nanoparticles , was prepared for the first time via single-step hydrothermal process at low temperature using IrCl 3 ·3H 2 O and TiCl 4 as starting materials. We found that the Ti 0·7 Ir 0·3 O 2 NRs with 70–80 nm in length and 25–30 nm in width is successful prepared at 210 °C for 12 h without utilizing surfactants or stabilizers . In addition, the Ti 0·7 Ir 0·3 O 2 NRs was presented principally as a single-phase solid with the TiO 2 is in the rutile form with high crystallinity without using further treatment after synthesis. More importantly, we found that the Ti 0·7 Ir 0·3 O 2 NRs possesses high electrical conductivity (0.028 S cm −1 ) dealing the intrinsically non-conducted drawback of TiO 2 . The Pt nanoparticles were then deposited on the support of Ti 0·7 Ir 0·3 O 2 NRs via chemical reduction method. The properties of 20 wt % Pt/Ti 0·7 Ir 0·3 O 2 NRs electrocatalyst were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), the cyclic voltammetry (CV). The uniformly distributed small Pt nanoparticles (3–4 nm diameter) were well adhered to the Ti 0·7 Ir 0·3 O 2 NRs. The electrochemically active surface area (ECSA) of 20 wt % Pt/Ti 0·7 Ir 0·3 O 2 NRs was higher than that of the commercial 20 wt % Pt/C (E-TEK) due to the small size and good dispersion of Pt nanoparticles on the surface of Ti 0·7 Ir 0·3 O 2 NRs. Moreover, the ECSA value of the Pt/Ti 0·7 Ir 0·3 O 2 NRs retained up to 88% after 2000 cycles of cyclic voltammetry, suggesting the high stability of catalyst resulted from strong metal support interaction (SMSI) of Titania-based materials with the noble metals. More importantly, the onset potential of Pt/Ti 0·7 Ir 0·3 O 2 NRs catalyst towards oxygen reduction reaction is more positive (∼80 mV) compared to commercial Pt/C, indicating the high catalytic activity of the Pt/Ti 0·7 Ir 0·3 O 2 NRs catalyst. The results of this research suggested that novel Ti 0·7 Ir 0·3 O 2 NRs could be applied as promising robust non-carbon support for Pt. This research also creates a preliminary step for investigating systematically promising Iridium doped Titania materials.
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JOURNAL OF MEMBRANE SCIENCE
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2018
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IF 6.578
Jianxian Zeng,Chaoqiang Lv,Guoqing Liu,Zhe Zhang,Zhihui Dong,JinYan Liu,Ying Wang
A novel ion-imprinted blend membrane was fabricated to separate selectively platinum(IV) from aqueous media. An amphiphilic copolymer poly(methyl methacrylate)-b-poly(4-vinylpyridine) (PMMA- b -P4VP) was firstly synthesized via the reversible addition fragmentation chain transfer polymerization , and characterized by 1 H NMR, FT-IR and GPC. Subsequently, poly(vinylidene fluoride) (PVDF) blend membranes were prepared using PMMA- b -P4VP as a blending additive. Effects of the following factors on performance of blend membranes were systematically examined: P4VP content of PMMA- b -P4VP, solvent type, and PMMA- b -P4VP/PVDF ratio. Further, platinum(IV) ion-imprinted membrane (Pt(IV)-IIM) was fabricated by blending polymer-Pt(IV) complexes with PVDF. SEM, FTIR-ATR, contact angle, water flux and adsorption capacity were employed to characterize all membranes. Results indicated that the membrane, which was prepared using the copolymer with high P4VP content (polymerization time 10 h) as a functional polymer , N,N-dimethylacetamide as a solvent and PMMA- b -P4VP/PVDF ratio of 30 wt%, exhibited an intriguing morphology and much higher performance. Pt(IV)-IIM showed higher adsorption and selectivity for Pt(IV) (selectivity coefficients of 27.66 ± 1.38 and 77.16 ± 3.86 for Pt(IV)/Cu(II) and Pt(IV)/Ni(II), respectively) compared with a non-imprinted membrane. During membrane filtration, Pt(IV)-IIM was effective and selective for separation of Pt(IV) in the presence of Cu(II) and Ni(II) ions. Also, Pt(IV)-IIM was chemical stable, and had a good regeneration performance.
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Nanomedicine-Nanotechnology Biology and Medicine
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2018
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IF 6.5
Xinyu Wang,Zhi Chang,Xin Nie,Yingying Li,ZhenPeng Hu,Jinlong Ma,Wei Wang,Teng Song,Pei Zhou,Huaqing Wang,Zhi Yuan
The clinical translation remains a major challenge for platinum drug loaded nanoparticle due to the complexity of composition and preparation. Here we employed only three ingredients to prepare Pt (IV) prodrug-loaded ligand-induced self-assembled nanoparticles (GA-ALG@Pt NPs) via facile one-pot route for liver tumor treatment . GA-ALG@Pt NPs were found equipped with intelligently ligand self-shielded property in which the internal GA could be induced to expose by initial cellular recognition, resulting in strengthened cellular uptake (20%-30%) and prolonged blood circulation time (3.43 times). Appreciable tumor targeting ability (2 times) and especially tumor selectivity (2.5 times) were obtained. Glutathione-triggered release of therapeutic agent generated satisfactory antitumor effect. Bio-safety is also a distinguishing feature of GA-ALG@Pt NPs that greatly relief the nephrotoxicity and systematic toxicity of cisplatin . This conveniently synthesized nanoparticle processes superior targeting capacity and biosecurity, supplying an effective approach to translational cancer therapy in the future.
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高影响因子
ACS Omega
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2018
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IF 0
Yizhi Wang,Shuo Wang,Fan Li,Yan Wang,Huairuo Zhang,Chunwen Sun
Highly active and durable electrocatalysts are vital for commercialization of direct methanol fuel cells. In this work, a three-dimensional nanocomposite consisting of platinum nanoparticles, W18O49 nanocables, and reduced graphene oxide composite (Pt/W18O49 NCs–rGO) has been prepared as an electrocatalyst for methanol oxidation reaction (MOR). The catalyst is prepared through a two-step method. The W18O49 nanocables and the reduced graphene oxide composite are prepared by a solvothermal process. Then, Pt nanoparticles are loaded on the W18O49 nanocables and the reduced graphene oxide composite by a hydrogen reduction at ambient condition. The obtained catalyst has a special three-dimensional architecture consisting of two-dimensional nanosheets, assembled one-dimensional nanocables, and the loaded nanoparticles on their surface. The Pt/W18O49 NCs–rGO catalyst shows 1.56 time mass activities than the Pt/C, with the current density of the forward anodic peak reaching 1624 mA/mgPt at 0.854 V versus reversible hydrogen electrode potential in 0.1 M HClO4 and 0.5 M CH3OH mixed electrolyte. It also shows a strong antipoisoning property toward CO. For the durability testing, the current density of Pt/W18O49 NCs–rGO shows a 37% decay, whereas the current of Pt/C catalyst shows a 41% degradation from 600 to 3600 s at 0.7 V. The high activity toward MOR, good antipoisoning for intermediate products, and excellent stability are ascribed to strong metal–support interaction effects between the Pt nanoparticles and the W18O49 NCs.
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ANALYST
·
2015
·Vol. 140
·期 19
·6684-6691
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IF 4.107
Fengmin Qiao,Zhenzhen Wang,Ke Xu,Shiyun Ai
A facile process was developed for the synthesis of FeSe–Pt@SiO2 nanospheres based on the hydrothermal treatment of FeCl3·6H2O, selenium and NaBH4 in ethanolamine solvent, followed by reducing HPtCl4 with NaBH4 in the presence of FeSe particles to obtain FeSe coated with Pt NPs (FeSe–Pt), ending with a surfactant assembled sol–gel process to obtain FeSe–Pt@SiO2. The morphology and composition of FeSe–Pt@SiO2 were characterized by transmission electron microscopy, high resolution TEM, X-ray diffraction and Fourier transform infrared spectroscopy. Structural analyses revealed that FeSe–Pt@SiO2 nanospheres were of regular spherical shape with smooth surfaces due to the SiO2 shells, compared with FeSe particles with 150 nm lateral diameter. The prepared FeSe–Pt@SiO2 nanospheres possessed both intrinsic glucose oxidase (GOx-) and peroxidase-mimic activities, and we engineered an artificial enzymatic cascade system with high activity and stability based on this nanostructure. The good catalytic performance of the composites could be attributed to the synergy between the functions of FeSe particles and Pt NPs. Significantly, the FeSe–Pt@SiO2 nanospheres as robust nanoreactors can catalyze a self-organized cascade reaction, which includes oxidation of glucose by oxygen to yield gluconic acid and H2O2, and then oxidation of 3,3,5,5-tetramethylbenzidine (TMB) by H2O2 to produce a colour change. Colorimetric detection of H2O2 and glucose using the FeSe–Pt@SiO2 nanospheres was conducted with high detection sensitivities, 0.227 nM and 1.136 nM, respectively, demonstrating the feasibility of practical sensing applications. It is therefore believed that our findings in this study could open up the possibility of utilizing FeSe–Pt@SiO2 nanospheres as enzymatic mimics in diagnostic and biotechnology fields.
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THIN SOLID FILMS
·
2014
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IF 1.867
Kui Cheng,Xiaozhao Wang,Wenjian Weng,Jun Lin,Huiming Wang
Light-induced cell detachment on the substrate of TiO 2 nanodots has been proved to be a safe and attractive method for cell harvesting in tissue engineering. In order to improve the cell release efficiency, bioinert platinum with excellent charge transport loading in biocompatible graphite was prepared. 20 wt.% Pt/C powder showing excellent electrical, chemical and bioactive properties was incorporated to a TiO 2 system. We investigated the biocompatibility of Pt/C–TiO 2 composite films with different amounts of Pt/C with C/tetrabutyl titanate molar ratio varying from 0 to 0.42. The adhesion and proliferation rates of pre-osteoblastic MC3T3-E1 cells (mouse calvaria-derived) on the films prepared with the highest C/TiO 2 molar ratio are higher than that of the pure TiO 2 and other films, indicating a Pt/C dose-dependent effect. It is shown that the detachment efficiency of MC3T3-E1 cells depends on Pt/C amount and UV illumination time. Moreover, films prepared with C/tetrabutyl titanate molar ratio of 0.42 showed 93% cell detachment ratio within 5 min of UV illumination, while bare TiO 2 films only reached 75%, indicating an improved cell release efficiency by the incorporation of Pt/C. However, an interesting phenomenon was found that longer illumination time showed lower detachment ratios to some extent, which is contrary to our previous work. It is believed that this work presents the improved cell detachment efficiency by the incorporation of Pt/C.
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ANALYST
·
2014
·Vol. 139
·期 22
·5964-5969
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IF 3.906
Meina Li,Yingzi Liu,Shushu Ding,Anwei Zhu,Guoyue Shi
A novel approach for in situ synthesizing poly(ionic liquid)–Pt nanoparticle (PIL–Pt) composite in a glass capillary for fabricating filling-type electrode is reported in this work. XRD and TEM were used to characterize the as-synthesized PIL–Pt composite. Because of the modification of poly(ionic liquid)s (PILs), the PIL–Pt composite can not only be dispersed well to form a homogeneous suspension of Pt nanoparticles, but also be synthesized directly in a glass capillary with a tip radius ranging from 250 nm to 2.5 µm. By simple heating at 130 °C, the PIL–Pt composite capillary electrode was fabricated under mild conditions. With the advantages of both PILs and glass capillary, a PIL–Pt capillary electrode can provide a favourable microenvironment for the encapsulated Pt nanoparticles and promote the mass transfer rate; thus, showing a high electrocatalytic activity and stability for an oxygen reduction reaction (ORR). The present study provided a novel method for the development of high performance electrocatalysts based on the construction of PIL–Pt composite in a glass capillary for fuel cell or electrochemical sensors.
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Nanoscale
·
2015
·Vol. 7
·期 13
·5699-5705
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IF 7.394
Jing-Jing Lv,Li-Ping Mei,Xuexiang Weng,Ai-Jun Wang,Li-Li Chen,Xiang-Feng Liu,Jiu-Ju Feng
A facile one-pot solvothermal method was developed for the fabrication of well-defined three-dimensional highly branched Pt–Pd alloyed multipods, using ethylene glycol as a solvent and a reducing agent, along with N-methylimidazole as a structure-directing agent, without any seed, template, or surfactant. The as-prepared nanocrystals exhibited a relatively large electrochemically active surface area, improved electrocatalytic activity and superior stability for ethylene glycol oxidation in alkaline media, compared with commercial Pt black and Pd black, making them promising electrocatalysts in fuel cells.
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ACS Applied Materials & Interfaces
·
2015
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IF 6.723
Honghai Liu,Decheng Wan,Jiang Du,Ming Jin
Straightforward organization of platinum nanoparticles (PtNPs) onto a macroscopic and robust material is described. PtNPs are in situ produced and stabilized by a dendritic amphiphile, where the latter consists of a hyperbranched polyethylenimine (PEI) as core and poly(styrene-co-2-ethylhexyl acrylate (P(St-EHA)) as shell. The resulting Pt@PEI@P(St-EHA), upon mixing with biphasic water and oil (a mixture of EHA and a dimethacrylate cross-linker in toluene), can self-assemble along the water/oil (W/O) interface and result in a stable emulsion. At W/O = 80/20 (volume ratio), a high internal phase emulsion (HIPE) forms and can be radically transformed into an open-cellular and elastic monolith termed Pt-polyHIPE, with PtNPs decorated on the surface. The Pt-polyHIPE is mechanically robust, and the cross-linking homogeneity by the dimethacrylate is responsible for the strength. The Pt-polyHIPE shows an active catalytic property, as evaluated by reduction of 4-nitrophenol. The material is conveniently and well recyclable, showing no decrease in catalytic activity at least within 20 cycles. Energy-dispersive X-ray spectra and thermogravimetric analysis also support sufficient retaining of the Pt species, where the multivalent and multiligand PEI should be responsible for this property.
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