RSC Advances
·
2019
·Vol. 9
·期 19
·10635-10644
·
IF 3.049
Xiaoxu Xuan,Jun Cheng,Xiao Yang,Junhu Zhou,Kefa Cen
Carbon supported nano-metal catalysts are expected to improve CO2 reduction selectivity and efficiency due to the addition of more active sites and enhancement of electron transport ability. In this study, HKUST-1 was pyrolyzed and decorated with Pt to prepare Pt–Cu/C catalysts. The catalytic effect of the catalysts with different Pt contents in the CO2 photoeletrochemical reduction reaction (CO2PRR) were compared. The total carbon atom conversion rate in CO2PRR experiments using Pt–Cu/C catalysts first increased to a peak when using 1.6 wt% Pt–Cu/C catalyst and then decreased with the increase of Pt content. The 1.6 wt% Pt–Cu/C catalyst showed good hydrogen evolution reaction (HER) inhibiting ability compared with other Pt–Cu/C catalysts. Density functional theory (DFT) calculations were conducted to give an insight into the CO2PRR mechanism on some possible active sites in Pt–Cu/C catalysts. The result demonstrated that HER was more likely to be inhibited on the Cu/Pt active surface and at the same time CO2PRR was promoted.
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高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2018
·Vol. 24
·期 6
·547-554
·
IF 0
Fang Chunyu,Zhong Huixian,Wei Ying,Wang Jiaming,Zhang Siran,Zhang Lihong,Liu Yuan
A new scheme for the preparation of highly dispersed precious metal catalysts is proposed in this work. Samples of LaCo 1− x Pt x O 3 /SiO 2 ( x = 0.03, 0.05, 0.07, 0.09, and 0.10) were prepared through a simple method of citrate acid complexation combined with impregnation. In a nanocrystallite of LaCo 1− x Pt x O 3 , ions of lanthanum, cobalt, and platinum are evenly mixed at the atomic level and confined within the nanocrystallite. In the reduction process, platinum ions were reduced and migrated onto the surface of the nanocrystallite, and the platinum should be highly dispersed owing to the even mixing of the platinum ions in the precursor. When x = 0.05 or lower, the highest dispersion of Pt could be achieved. The highly dispersed Pt is stable, because of the strong interaction between Pt atoms and the support. The catalysts were characterized by BET surface area, temperature-programmed reduction, X-ray diffraction, transmission electron microscopy, CO temperature-programmed desorption, and turnover frequency. Compared with general precious metal Pt catalysts, the LaCo 0.95 Pt 0.05 O 3 /SiO 2 catalyst exhibited better activity for CO oxidation, and it maintained stability at a high temperature of 400 °C for 250 h with complete CO conversion.
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CRYSTENGCOMM
·
2018
·Vol. 20
·期 36
·5387-5394
·
IF 3.304
Haiyue Peng,Xiaojian Yang,Yuanyuan Ma,Jianing Liu,Yonghui Wang,Huaqiao Tan,Yangguang Li
The development of highly active and stable electrocatalysts for HER has been received extensive attention. Among these, minimizing the Pt usage and promoting its utilization efficiency are essential prerequisites for a future hydrogen economy. Herein, we use a new ε-Keggin-type polyoxometalate-based metal–organic framework H3[Zn4(bimb)2][PMoV8MoVI4O40]·12H2O (POMOF-1) as a support to load a low amount of ultrasmall Pt nanoparticles (NPs), and then mix this material with Ketjenblack carbon (KB) to form a new composite catalyst (Pt@POMOF-1/KB). This composite catalyst shows a low Pt loading amount of 0.43 wt% and the average size of the Pt NPs is 1.5 nm. Pt@POMOF-1/KB exhibits a remarkable HER performance in 0.5 M H2SO4. It only requires an overpotential to of 23 mV to observe a current density of 10 mA cm−2, which is superior to that of 20% Pt/C. The mass activity of Pt@POMOF-1/KB is almost 100 and 37 times that of 20% Pt/C at overpotentials of 50 and 100 mV, respectively, as a consequence of the very low noble-metal loading. This result may provide an approach to meet the cost requirements for large-scale applications.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Yamin Fu,Di Huang,Congming Li,Lina Zou,Baoxian Ye
This paper described a novel, facile and nonenzymatic electrochemical biosensor to detect hydrogen peroxide (H 2 O 2 ). The sensor was fabricated based on Pd-Pt nanocages and SnO 2 /graphene nanosheets modified electrode (PdPt [email protected] /GCE). The electrochemical behavior of PdPt [email protected] /GCE exhibited excellent catalytic activity toward H 2 O 2 with fast response, high selectivity , superior sensitivity, low detection limit of 0.3 μM and large linear range from 1 μM to 300 μM. Under these obvious advantages, the constructed biosensor provided to be reliable for determination of H 2 O 2 secreted from human cervical cancer cells (Hela cells). Hence, the proposed biosensor is a promising candidate for detection of H 2 O 2 in situ released from living cells in clinical diagnostics.
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高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
X.T. Li,H. Lei,C. Yang,Q.B. Zhang
Developing highly active and durable methanol electrooxidation reaction electrocatalysts for direct methanol fuel cells is crucial to achieve their practical application in future energy storage and conversion . Herein, we demonstrate that a nickel supported Pt-decorated electrode with an ultralow mass loading (1.50 μg cm −2 ) featuring Ni-Pt hybrid nanoparticles growing on self-reconstructed porous nickel frameworks (Pt/p-Ni) is synthesized via a facile electrochemical activation process . The self-supported Pt/p-Ni exhibits 3.65-fold higher activity for catalyzing the methanol electrooxidation reaction than that of commercial Pt/C with the same Pt loading under alkaline media . The activation approach results in surface rearrangement of Ni substrate to form nanoporous skeletons and highly dispersed Ni-Pt hybrid nanoparticles with a mean size of 4.34 nm grown on the nano-ligaments of the Ni porous skeletons. The porous skeletons decorated with nano-dispersion of Pt significantly increase the surface active sites and, therefore, yield a superior catalytic activity . Experiments coupled with density-functional theory calculations suggest the existence of a strong electronic interaction at the superface of the Pt/p-Ni, which leads to efficiently weaken the adsorption of CO on the catalyst surface and alleviate the CO ads poisoning of the active sites, resulting in remarkably enhanced methanol electrooxidation activity and durability.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 3
·e4208
·
IF 3.581
Yan Gao,Jiasheng Fang,Yiwei Zhang,Chao Zhang,Shuo Zhao,Yuming Zhou,Mengqiu Huang,Xiaoli Sheng
A facile strategy is reported for the fabrication of Pt-loaded core–shell nanocomposite ellipsoids (Fe 2 O 3 -Pt@DSL) consisting of ellipsoidal Fe 2 O 3 cores, double-layered La 2 O 3 shells and deposited Pt nanoparticles (NPs). The formation of the doubled-shelled structure uses Fe 2 O 3 -Pt@mSiO 2 as template sacrificial agent and it involves the re-deposition of silica and self-assembly of metal oxide units. The preparation methods of double-shelled metal oxides avoid repeated coating and etching and could be utilized to fabricate other shaped double-shelled composites. Characterization results indicated that the Fe 2 O 3 -Pt@DSL nanocomposites possessed mesoporous structure and tunable shell thickness. Moreover, due to the formation of Fe 2 O 3 and La 2 O 3 composites, Pt NPs can also be stabilized via deposition on chemically active oxides with a synergistic effect. Therefore, as a catalyst for the reduction of 4-nitrophenol, Fe 2 O 3 -Pt@DSL showed superior catalytic activity and reusability due to structural superiority and enhanced composite synergy. Finally, well-dispersed Pt NPs were encapsulated into the void between the shell layers to construct the Fe 2 O 3 -Pt@DSL-Pt catalyst.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xiaohong Tan,Wenzhan Li,Wei He,Tingting Yu,Bingbing Wan,Yong Huang,Jintao Liang,Guiyin Li
Glypican-3 (GPC3), which is a surface heparan sulfate proteoglycan, has been widely known the ideal biomarker for diagnosis and treatment of hepatocellular carcinoma (HCC). Accurate and sensitive detection of serum GPC3 level is an important and challenging task. In this paper, a sandwich electrochemical aptasensor was designed to specifically detect serum GPC3 level through aptamer-target-aptamer recognition. A GPC3 aptamer (GPC3 Apt ) immobilized on the surface of gold nanoparticles@reduced graphene oxide modified screen-printed electrode (Au NPs@rGO/SPCE) was used as the capture probe. Hemin-reduced graphene oxide-carboxymethyl chitosan@platinum nanoparticles (H-rGO-CMC@Pt NPs), with good mimicking peroxidases activity, were labeled with amination GPC3 aptamer, which was employed as the signal probe. Once the target GPC3 was anchored on the surface of GPC3 Apt /Au NPs@rGO/SPCE, the H-rGO-CMC@Pt NPs-GPC3 Apt was further specifically bound to the GPC3, forming the aptamer-target-aptamer sandwich structure, which can catalyze the oxidation of hydroquinone (HQ) to benzoquinone (BQ) and lead the oxidation current of HQ recorded by DPV to changing. The linear relationship between the current signal of oxidation of HQ and GPC3 concentration range of 0.0001–3.0 µg/mL and 3.0–60.0 µg/mL, with a low detection limit (LOD) of 0.0685 ng/mL. Additionally, the electrochemical aptasensor was successfully applied for the detection of GPC3 in human serum samples with the recovery of 99.95–104.06 % and relative standard deviation (RSD) of 1.31–5.22 %. Thus, the sandwich aptasensor could provide a new strategy for detection of serum GPC3 level and improve the early diagnosis rate of HCC.
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Nanoscale
·
2015
·Vol. 8
·期 9
·4976-4983
·
IF 7.394
Fangzhi Mou,Lei Kong,Chuanrui Chen,Zhihong Chen,Leilei Xu,Jianguo Guan
In this work, water-fuelled TiO2/Pt Janus submicromotors with light-controlled motions have been developed by utilizing the asymmetrical photocatalytic water redox reaction over TiO2/Pt Janus submicrospheres under UV irradiation. The motion state, speed, aggregation and separation behaviors of the TiO2/Pt Janus submicromotor can be reversibly, wirelessly and remotely controlled at will by regulating the “on/off” switch, intensity and pulsed/continuous irradiation mode of UV light. The motion of the water-fuelled TiO2/Pt Janus submicromotor is governed by light-induced self-electrophoresis under the local electrical field generated by the asymmetrical water oxidation and reduction reactions on its surface. The TiO2/Pt Janus submicromotors can interact with each other through the light-switchable electrostatic forces, and hence continuous and pulsed UV irradiation can make the TiO2/Pt Janus submicromotors aggregate and separate at will, respectively. Because of the enhanced mass exchange between the environment and active submicromotors, the separated TiO2/Pt Janus submicromotors powered by the pulsed UV irradiation show a much higher activity for the photocatalytic degradation of the organic dye than the aggregated TiO2/Pt submicromotors. The water-fuelled TiO2/Pt Janus submicromotors developed here have some outstanding advantages as “swimming” photocatalysts for organic pollutant remediation in the macro or microenvironment (microchannels and microwells in microchips) because of their small size, long-term stability, wirelessly controllable motion behaviors and long life span.
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RSC Advances
·
2015
·Vol. 5
·期 106
·87061-87068
·
IF 3.84
Pei Song,Shan-Shan Li,Li-Li He,Jiu-Ju Feng,Liang Wu,Shu-Xian Zhong,Ai-Jun Wang
In this work, bimetallic Au–Pt alloyed nanowire networks (AuPt NNs) were facilely synthesized by a simple and rapid one-pot wet-chemical method on a large-scale, using N-methylimidazole as a structure-directing agent and a weak stabilizing agent. The surface of AuPt NNs was clean owing to the easy removal of the adsorbed N-methylimidazole. The control experiments demonstrated that the morphologies of AuPt NNs were strongly correlated with the amount of N-methylimidazole and reaction temperature. The formation mechanism included the four-stage growth processes: rapid nucleation, selective adsorption, π–π induced assembly, and oriented attachment growth. The as-synthesized AuPt NNs exhibited enhanced electrocatalytic activity and improved stability for methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) as compared to commercial Pt black and individual Pt nanoparticles.
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ANALYTICAL SCIENCES
·
2017
·Vol. 33
·期 3
·321-325
·
IF 1.228
Yuan-Feng WANG,Na PAN,Chi-Fang PENG
In this study, a sensitive colorimetric method for the detection of copper ion (Cu2+) was developed based on controlling the peroxidase-like activity of (gold core)@(ultrathin platinum shell) nanocatalysts (Au@Pt-NCs). It was found that D-penicillamine can effectively inhibit the activity of Au@Pt-NCs. After being incubated with Cu2+, D-penicillamine lost inhibition toward the catalytic ability of Au@Pt-NCs. Based on the above interaction, a colorimetric detection of Cu2+ was develop by measuring the colorimetric signal variation of the H2O2-3,3′,5,5′-tetramethylbenzidine (TMB) reaction. This method exhibited high sensitivity and selectivity toward Cu2+ over a panel of other metal ions. The detection limit of this method was 3.7 nM and the linear range was 20 – 300 nM. Moreover, 20 nM Cu2+ can be distinguished directly by the naked eye. Furthermore, this method was applied to the analysis of water samples with good accuracy. These results demonstrated the excellent application potential of the method.
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高影响因子
CRYSTENGCOMM
·
2016
·Vol. 19
·期 3
·461-468
·
IF 3.849
Qing Yan,Aiping Wu,Haijing Yan,Yuying Dong,Chungui Tian,Baojiang Jiang,Honggang Fu
Nano-sized hollow spheres with tunable microstructures are urgently needed for their applications in advanced fields. The ZnS hollow spheres reported previously have usually required a complex multi-step process, and/or large size and/or less tunability in the microstructure. Here, a simple gelatin-assisted hydrothermal reaction of Zn(OAc)2 and thiourea was developed for the synthesis of ZnS hollow nanospheres. The size of the hollow spheres could be controlled below 100 nm with good homogeneity. The presence of gelatin is essential to decrease the size of ZnS particles and to form hollow structures. Only solid spheres with a large size were prepared in the absence of gelatin. The structure of hollow nanospheres could be regulated by altering the reaction parameters. Typically, the size of voids increases with prolonged reaction time. Also, the grain size of the hollow spheres increased with increasing reaction temperature (from about 3 nm to 10 nm) accompanied by a decrease in shell thickness. The results indicated that the hollow structure was formed through an “Ostwald ripening” process. The ZnS hollow nanospheres were used as catalyst for photocatalytic hydrogen production without additional co-catalyst. The maximum H2 production rate reached was 340 μmol h−1 (about 6.8 mmol h g).
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ELECTROANALYSIS
·
2016
·Vol. 29
·期 2
·602-608
·
IF 2.471
Zhiming Jiang,Qin Liu,Yuran Tang,Mingxiao Zhang
Pt−Au nanoclusters decorated on the surface of reduced graphene oxide (rGO/Pt−Au) was facilely prepared by one-pot electrochemical reduction. The morphology and composition of rGO/Pt−Au composites had been characterized by scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectrometry (EDX), fourier transform-infrared spectroscopy (FT-IR) and electrochemical methods. Ofloxacin is a member of synthetic quinolones which has been widely used for the treatment of common diseases in humans and animals. The performance of the rGO/Pt−Au nanocomposite toward the oxidation of ofloxacin was compared with the other similar nanostructures like rGO/Pt and rGO/Au. In the optimized conditions, two linear calibration curves were obtained, from 0.08 to 10 μM and 10 to 100 μM ofloxacin. A detection limit of 0.05 μM ofloxacin was observed at pH 5.7 for the GCE/rGO/Pt−Au. The proposed sensor was successfully applied to determine ofloxacin in tablets and human urine samples and the results were satisfactory.
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