JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 8
·H351
·
IF 3.12
Lihui Zhang,Jessie Khungwa,Yue Liu,Ling Li,Xiaohong Wang,Shengtian Wang
A novel electrochemical active electrode based on isopolyacid ion IMo6O245- (IMo6), Pt and graphene oxide (GO) had been fabricated, which was used as a biosensor in double signal amplification platform for simultaneous detection of ascorbic acid (AA), dopamine (DA) and uric acid (UA). Cyclic voltammetry, amperometry and differential pulse voltammetry indicated that a glass carbon electrode modified with Pt/IMo6/GO (Pt/IMo6/GO-GCE) presented higher electrochemical activity toward the oxidation of AA, DA and UA and faster response than those of a bare GCE, GO-GCE, Pt/GO-GCE and IMo6/GO-GCE. As an electrochemical sensor, the Pt/IMo6/GO-GCE showed a wide linear range of 50–4000 μM, 4–750 μM, and 75–300 μM with the limits of detection (S/N = 3) as 6.4 μM, 0.22 μM and 0.72 μM, corresponding to AA, DA and UA, respectively. In addition, the Pt/IMo6/GO-GCE provided a new option in the simultaneous determination of AA, DA and UA in human blood serum with reliable recovery.
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CRYSTENGCOMM
·
2017
·Vol. 19
·期 37
·5565-5575
·
IF 3.474
Hui-Ze Wang,Bo Chen,Deng-Yuan Hao,Xin-Peng Miao,Dan Zhao,Ning Zhang
Pursuing a general and feasible method to construct precious metal (PM) nanostructures bounded by high-index facets (HIFs) is highly desirable for both academic and industrial interests in promising metal materials. Herein, attempts to employ modified galvanic replacement processes between MClxy− (M = Pt, Pd or Au) PM precursors and sacrificed templates of Ag nanocubic particles with deliberately introduced high [Cl−] (concentration of Cl−) were investigated to gain more acceptable HIF PM nanostructures. Typically, the Pt–Ag system was chosen as a representative system and monitored by the comprehensive characterizations of UV-vis, XRD, XPS and TEM to illuminate the evolution of the corresponding particles. It was demonstrated that the deliberately introduced Cl− at a certain concentration ([Cl−] was not lower than 1.5 M) could play dual roles in the kinetic evolution of the particles: one was dramatically lowering the etching speed to confine the reaction to the surface layers of the Ag substrates, and the other was facilitating the anisotropic etching process along the PVP-protected Ag surface through the Nernst–Einstein diffusion influence on PtCl42−, which in turn led to the formation of concave nanocubic particles with Pt-highly-dispersed [hk0] high-index surfaces (combined by the [210], [410] and [510] atomic terraces) on the Ag templates. The efficiencies of the method were further confirmed by constructing similar Pd- or Au-highly-dispersed high-index surfaces on Ag templates, suggesting that the method is a novel and general strategy to directly construct PM-based high-index surfaces with high PM dispersion in bimetallic nanostructures, which could be referenced as a solution to obtain superior precious metal materials possessing both unique HIF surface configuration and cost-saving competitiveness for advanced applications.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 1
·1-11
·
IF 5.3
Zhang Junli,Zhao Yanyan,Hu Haiying,Lv Min,Zhang Hongling
A nano-enzyme sandwich assay (SWzyme assay), a colorimetric system based on a biochip and inorganic nano-enzyme for rapid and simple determination of exosomal Aβ42 in plasma is proposed. Anti-CD63 antibody-modified biochips were prepared for plasma exosome capture and synthesized highly catalytic Ni@Pt nanozymes for detecting exosomal Aβ42. The method was able to detect exosomal Aβ42 with a limit of detection (LOD) as low as 4.2×10 4 particles/mL and a linear range from 10 4 to 10 8 particles/mL. By determination of exosomal Aβ42, the SWzyme assay successfully distinguished plasma from Alzheimer’s desease (AD) and healthy mice. The SWzyme assay holds promise to serve as diagnostic tools for the early detection of AD and supporting the development of personalized medicine. Graphical abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Li Tian,Tao Hu,Yawen Guo,Peng Ju,Xiujuan Chen,Yueming Li,Xuedong Bai,Guorui Zhao
The design of self-supporting structure is particularly important to improve the stability and electrochemical performance of hydrogen evolution reaction electrode. Here, a facile strategy for building novel ultra-stable 0D-2D-3D integrated self-supporting electrode with high conductivity, sufficient diffusion channels and large reactive surface area was proposed. In the heterostructure, 2D Ti 3 C 2 T x flakes in-situ synthesized on 3D network porous Ti 3 AlC 2 surface which provides the multiple reactive surface areas and aggregation resistance to facilitating 0D ultrafine Pt nanoparticles uniform anchorage. Combined with structural characterization and first-principles calculations revealed that, the highly dispersed ultrafine Pt synergistically coupling strong metal-support interactions creates a unique multifunctional catalytic interface with high stability and atomic utilization efficiency of Pt to promote the HER in acidic and seawater. The resultant self-supporting electrode (support 0.48 wt% Pt) exhibits much superior activity to 10 % commercial Pt/C (loaded on foam nickel) in 0.5 M H 2 SO 4 (55 mV@10 mA cm −2 ) and simulate seawater (196 mV@10 mA cm −2 ) while reducing the Pt usage by 15 times. Meanwhile, the electrode also illustrates outstanding stability under high current densities (100 h@100 mA cm −2 ). This study provides a new design idea for developing integrated self-supporting catalytic electrodes to meet the durability of hydrogen evolution reaction applications in harsh environments.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Jing Chen,Jia Ge,Lin Zhang,Zhaohui Li,Lingbo Qu
In this work, we developed a highly sensitive and simple colorimetric method for glucose detection using poly(styrene sulfonate)/Pt-modified graphene nanosheets (PSS-GN-Pt) as peroxidase mimetics. First, in the presence of glucose, H 2 O 2 was generated as the main by-product of glucose oxidase (GOx)-catalyzed reaction. Then, the obtained H 2 O 2 triggered the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to generate blue color with the aid of PSS-GN-Pt nanocomposites as peroxidase mimetics. Via this method, as low as 9.28 × 10 −8 M glucose could be detected with a linear range from 2 × 10 −7 M to 1 × 10 −3 M. Besides absorbency measuring, the visual detection of glucose by naked eyes could also be realized very easily through the observable color changing from colorless to blue. In addition, this strategy was further used to determine the concentrations of glucose both in injection and serum samples with satisfying results. This proposed nanosystem holds great potential for diabetes mellitus research and can be easily expanded to the detection of various H 2 O 2 -involved analytes.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Yingxin Liu,Xiaojie Yang,Haiyan Liu,Yuhua Ye,Zuojun Wei
Mesoporous carbon (MC) and nitrogen-doped mesoporous carbon (NMC) were prepared through a dual-template approach with tetraethyl orthosilicate and Pluronic F127 as a dual-template, and phenol-formaldehyde and melamine-phenol-formaldehyde resins as carbon and carbon + nitrogen sources, respectively. Using them as the supports, the Pt/MC and Pt/NMC catalysts were prepared by incipient wetness impregnation method and used for the decarboxylation of saturated and unsaturated fatty acids to alkanes. Activated carbon supported Pt catalyst (Pt/AC) was also prepared for comparison. Among the three catalysts, Pt/NMC exhibited the highest catalytic performance, achieving yields of the corresponding alkanes of more than 97.0% from lauric, myristic, palmitic and stearic saturated acids and 44.0%–66.1% from oleic and linoleic unsaturated fatty acids. The turnover frequencies of Pt/NMC were estimated as 335–522 h −1 in the decarboxylation of saturated acids, which were almost 2-fold higher than Pt/MC and 3-fold higher than Pt/AC. The excellent performance of the Pt/NMC catalyst might be attributed to the introduction of N species to the MC support, which not only improved the anchoring and the dispersion of Pt nanoparticles on the catalyst surface, but also provided alkaline sites to adsorb carboxyl group in fatty acids.
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Pengtao Qiu,Jinglei Bi,Xiaojing Zhang,Shengchun Yang
We present a novel synthetic strategy for the shape-controlled synthesis of Pt-based alloy nanoparticles (NPs) in inorganic molten salt without using any organic surfactants or capping agents. Graphene oxide (GO) was chosen as the stabilizer in the inorganic molten salt synthetic strategy, due to the existence of various oxygen-containing functional groups on its surface, which adsorb, anchor, and stabilize the metal ions or NPs. After GO was added in molten salt, the PtPd nanosheets were formed on its surface in H2 atmosphere. In addition, when KI was chosen as the shape-inducing agent to selectively adsorb on and fully protect the (100) facets of alloys, PtPd nanocubes with core–shell structure, PtCu nanohemicubes, and PtPdCu nanocubes were prepared successfully on the surface of GO in molten salt. Introduction of GO as the stabilizer in molten salt proves a new approach in synthesis of Pt-based nanocrystals with controlled morphologies.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Jiayi Jin,He Mei,Huimin Wu,Shengfu Wang,Qinghua Xia,Yu Ding
The Cu 2 O@Pt nanoparticles were prepared by a two-step method, using Vulcan XC-72 carbon as support (donated as Cu 2 O@Pt/C). Transmission electron microscopy , X-ray diffraction and X-ray photoelectron spectroscopy were used to characterize the resulting Cu 2 O@Pt core-shell nanoparticles. The chemically modified electrode based on Cu 2 O@Pt/C nanocomposites was employed to eliminate the interference from ascorbic acid and uric acid for the sensitive and selective determination of dopamine. The electrochemical results indicate that the Cu 2 O@Pt/C nanocomposites show better electrocatalytic activity for the oxidation of dopamine than Pt/C nanocomposites with a linear range from 10 nM to 1027.16 μM, a detection limit of 3 nM (S/N = 3) and sensitivity of 638.0 μA mM −1 cm −2 . Moreover, the sensor exhibits excellent long-time stability, good reproducibility and can be applied for practical application.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Zhi Liang Zhao,Qi Wang,Lian Ying Zhang,Hong Ming An,Zhou Li,Chang Ming Li
Development of an inexpensive high performance catalyst with low Pt loading remains a great challenge. Herein galvanic exchange-formed ultra-low Pt loaded porous Ag-Pd binary alloy nanotubes (Pt/Ag-Pd) was prepared as a catalyst toward oxygen reduction reaction (ORR). With highly dispersed active but ultra-low Pt atoms (Pt: about 5.8 wt%) on the porous binary alloy surface, the Pt/Ag-Pd catalyst increases mass activity toward ORR by 1.82 times than commercial Pt/C while possessing excellent operation stability. The performance enhancement is mainly attributed to the unique porous Pt shell/Ag-Pd core tubular structure for increased active sites and facilitated interfacial electron transfer rate by a unique Ag-Pd jointly modified electronic structure. This catalyst holds great promise for practical applications in low temperature fuel cells.
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ACS Sustainable Chemistry & Engineering
·
2015
·
IF 4.642
Shanlong Chen,Aichun Xu,Jie Tao,Haijun Tao,Yizhou Shen,Lumin Zhu,Jiajia Jiang,Tao Wang,Lei Pan
A novel in-situ and green method with the combination of TiCl4 pretreatment and solvothermal growth was proposed to prepare the Pt-free Cu2ZnSnS4 (CZTS) counter electrodes (CEs) on FTO substrate. It was found that TiCl4 pretreatment toward the substrates was crucial to a high quality and high efficiency CZTS film, which consists of nanosheet and nanoparticle structure. The highly crystallized nanosheets were assembled from kesterite structure CZTS nanocrystals, with an average diameter of 10–30 nm. The detailed morphology, crystal structure, and composition of the CZTS nanostructures were characterized by SEM, TEM, SAED, XRD, Raman, and EDS analysis, respectively. Electrocatalytic abilities of the films toward I–/I3– were verified through cyclic voltammograms (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization measurements. A maximum power conversion efficiency of 5.65% was achieved for a cell with CZTS 3, under 100 mW/cm2, which was higher than that of a cell with a commercial Pt counter electrode (4.96%). This high efficiency was mainly attributed to the good bonding strength between CZTS films and FTO substrate (RS = 4.41 Ω cm2), and higher electron-transfer process at the electrolyte/CE interface (high JSC), along with superior electrochemical catalytic ability (RCt = 2.40 Ω cm2). The in-situ prepared CZTS CEs are proven to be suitable for high efficiency Pt-free dye-sensitized solar cells (DSSCs), leading to significantly decrease of the cell cost and simplification of preparation process.
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ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Wantao Liu,Yanyan Fang,Peng Xu,Yuan Lin,Xiong Yin,Guangshi Tang,Meng He
Polypyrrole/reduced graphene oxide (PPy/RGO) composites on the rigid and plastic conducting substrates were fabricated via a facile two-step electrochemical process at low temperature. The polypyrrole/graphene oxide (PPy/GO) composites were first prepared on the substrate with electrochemical polymerization method, and the PPy/RGO composites were subsequently obtained by electrochemically reducing the PPy/GO. The resultant PPy/GO and PPy/RGO composites were porous, in contrast to the dense and flat pristine PPy films. The cyclic voltammetry measurement revealed that resultant composites exhibited a superior catalytic performance for triiodide reduction in the order of PPy/RGO > PPy/GO > PPy. The catalytic activity of PPy/RGO was comparable to that of Pt counter electrode (CE). Under the optimal conditions, an energy conversion efficiency of 6.45% was obtained for a rigid PPy/RGO-based dye-sensitized solar cell, which is 90% of that for a thermally deposited Pt-based device (7.14%). A plastic counter electrode was fabricated by depositing PPy/RGO composites on the plastic ITO/PEN substrate, and then an all-plastic device was assembled and exhibited an energy conversion efficiency of 4.25%, comparable to that of the counterpart using a sputtered-Pt CE (4.83%) on a plastic substrate. These results demonstrated that electrochemical synthesis is a facile low-temperature method to fabricate high-performance RGO/polymer composite-based CEs for plastic DSCs.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2013
·Vol. 18
·期 4
·1087-1097
·
IF 2.279
Yan Zhenhua,Wang Min,Lu Youqin,Liu Renmin,Zhao Jinsheng
Three carbon-supported Pt–Co alloys with varying Pt to Co atom ratio (Pt 2 –Co/C, Pt–Co/C, Pt–Co 2 /C) were prepared by NaBH 4 reduction in ethylene glycol at room temperature. As supported by X-ray diffraction, all the prepared Pt–Co nanoparticles have a single-phase face-centered cubic structure. Transmission electron microscopy indicates that all nanoparticles have small particle-size range and are highly dispersed on carbon support. Catalytic properties of the synthesized Pt–Co alloy catalysts were analyzed using cyclic voltammetry and linear sweep voltammetry methods, and the results suggested that Pt–Co/C catalysts exhibit the best Pt mass activity and the highest stability for the oxygen reduction reaction (ORR) when compared with Pt/C catalyst and other Pt–Co alloy catalyst in both acidic and neutral media. Kinetic analysis reveals that the ORR on Pt–Co alloy follows the four-electron pathway leading to water. As the cathode catalyst, the single-chamber microbial fuel cell tests indicated the much better performance of Pt–Co alloy than that of commercial Pt/C.
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