Advanced Healthcare Materials
·
2024
·
IF 10
Sijia Wu,Qian Wang,Jun Du,Lejin Zhu,Fujun Yang,Jiacheng Lu,Xueyu Li,Yuhao Li,Jingtao Cui,Yuqing Miao
Sonodynamic therapy (SDT) represents a promising, noninvasive, and precise treatment modality for tumors, demonstrating significant potential in clinical applications. However, the efficiency of sonosensitizers in generating reactive oxygen species (ROS) is often limited by rapid electron-hole recombination. In this study, BiF 3 @BiOI is synthesized via a co-precipitation method, followed by in-situ reduction to decorate it with Pt nanoparticles, resulting in BiF 3 @BiOI@Pt-PVP (BBP) nanocomposite for enhancing SDT efficacy. The formation of the BiF 3 @BiOI heterojunction enhances charge separation ability. The decoration of Pt nanoparticles narrows the bandgap and alters the band positions and Fermi level of BBP, which can effectively mitigate the rapid recombination of electron-hole pairs and facilitate a cascade reaction of ROS, thereby improving ROS generation efficiency with ultrasound excitation. Additionally, bismuth ions in BBP and the generated holes consume glutathione, exacerbating cellular oxidative damage, and triggering PANoptosis and ferroptosis. Furthermore, Pt nanoparticles demonstrate peroxidase-like activity, catalyzing endogenous hydrogen peroxide to oxygen. These functions are helpful against tumors for alleviating hypoxic conditions, reshaping the microenvironment, modulating immune cell infiltration capacity, and enhancing the efficacy of immunotherapy. The dual strategy of forming heterojunctions and sensitization with noble metals effectively enhances the efficacy of sono-catalytic therapy-induced immune activation in tumor treatment.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Na Sun,Jiaojiao Song,Qingmei Tao,Erjie Kan,Long Kuai
Photocatalysis utilized solar energy with metal oxide semiconductors has been considered as one of the attractive green routes for organics’ conversion. The construction of high-density co-catalytic sites is essential for the surface reaction kinetics . In this work, a high-efficiency mesoporous TiO 2 decorated with single atomic Pt loading of 1 at% (2.1 wt%) had been successfully achieved. The high specific surface area of mesoporous TiO 2 affords adequate physical surface for the resident of atomic Pt, thus stabilizing a high areal density of single-atom reaction sites. The optimized single-atom Pt/TiO 2 revealed a performance of 4.1 mmol/h/g cat for photocatalytic oxidation of benzyl alcohol under visible light irradiation that is 3.8 folds than that of Pt-modified commercial TiO 2 photocatalysts . The reactivity will further enhance after the introduction of plasmonic Au nanoparticles and the finally sample (1 at % Pt-0.075 at % Au)/TiO 2 -MP exhibited salient activity (4.5 mmol/h/g cat ) and stability. This work paves a potential way to boost the performance of metal oxide semiconductors for green photocatalytic conversion of organics.
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高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Xiangjie Guo,Qi Wang,Haiyan He,Huajie Huang
The large-scale commercialization of direct methanol fuel cells (DMFCs) largely depends on the design and synthesis of advanced Pt-based anode catalysts with excellent electrocatalytic performance and acceptable costs. Herein, we propose a controllable and scalable method to the construction of ultrafine Pt nanocrystals supported by boron and nitrogen codoped carbon nanohorns (Pt/BN-CNH) as electrocatalysts for methanol oxidation reaction. The as-derived Pt/BN-CNH architectures are endowed with a series of interesting physicochemical properties, such as accessible internal pores, numerous active conical tips, coexistence of B and N atoms, and homogeneous Pt distribution. Consequently, the resulting Pt/BN-CNH catalysts present high catalytic activity, reliable long-term stability as well as strong antipoisoning capacity towards methanol oxidation, all of which are superior to those of conventional Pt/carbon black, Pt/carbon nanotube, Pt/graphene and Pt/undoped CNH catalysts, thus offering great potentials in the next-generation DMFC devices.
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高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Zhenzhen Song,Yongcheng Zhang,Chaojing Lu,Zhenmeng Ma,Zhenjia Hu,Lin Wang,Chao Liu
Relaxor ferroelectric 0.75(Pb 1–3 x /2 La x )(Mg 1/3 Nb 2/3 )O 3 -0.25(Pb 1–3 x /2 La x )TiO 3 (La 3+ :PMN-PT x /75/25, where x =2.8, 3.0, 3.5, and 4.0 mol% of La 3+ ) transparent ceramics were fabricated by the combination of oxygen atmosphere pressureless sintering and hot-pressing sintering process. The optical transmittances of above four ceramics are higher than 60% at the wavelength of 500–900 nm. La 3+ :PMN-PT 3.0/75/25 exhibits the highest transparency around 70% at 900 nm which is very close to the theoretical transmittance 71%. Each of the four ceramics exhibits the pure perovskite phases. They show fully dense microstructures and their relative densities are higher than 99.8%. The ferroelectric and dielectric measurements indicate that these four ceramics exhibit relaxation characteristics. With increasing La 3+ content, (200) peak in XRD patterns shifts to higher angles and the average grain size increases, while the temperature Tε max corresponding to the maximum ε r , the remanent polarizations P r and coercive fields E c decrease gradually.
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高影响因子
Catalysis Science & Technology
·
2017
·Vol. 7
·期 21
·5055-5068
·
IF 5.773
Pengyu Niu,Hongjuan Xi,Jun Ren,Minggui Lin,Qiang Wang,Litao Jia,Bo Hou,Debao Li
Highly siliceous ZSM-22 was synthesized under hydrothermal conditions with ZSM-22 seeds. Characterization by FT-IR and 1H and 29Si NMR spectroscopy confirms that due to the existence of defective sites in the siliceous ZSM-22, acidic silanol groups including vicinal silanol and silanol nests are detected. Acidic silanol groups are considered as the acid sites of siliceous ZSM-22. As a result, siliceous ZSM-22 shows much lower acid site density and lower acid strength than silica–alumina ZSM-22 which contains hydroxyl groups bridging Si and Al as acid sites. In n-dodecane isomerization, Pt/siliceous ZSM-22 shows much higher isomer selectivity than Pt/silica–alumina ZSM-22. Furthermore, a lower loading amount of Pt on siliceous ZSM-22 (about 0.2 wt% Pt) can lead to high isomer selectivity. Owing to the acidic silanol groups and the low acid site density of siliceous ZSM-22, a good balance between metal and acid function in Pt/siliceous ZSM-22 is achieved, which results in a lower allowable Pt loading value and higher isomer selectivity.
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高影响因子
RSC Advances
·
2020
·Vol. 10
·期 11
·6287-6296
·
IF 3.119
Zhikun Liu,Yanhong Yin,Daijun Yang,Cunman Zhang,Pingwen Ming,Bing Li,Shuting Yang
A simple and efficient method was used to prepare highly active and durable carbon-supported ultrathin Pt–Co nanowires (NWs) as oxygen reduction reaction (ORR) catalysts for the cathode in a proton exchange membrane fuel cell (PEMFC). Chromium hexacarbonyl plays a significant role in making Pt and Co form an alloyed NW, which acts as both a reducing agent and a structure directing agent. The nanocrystal exhibits a uniform nanowire morphology with a diameter of 2 nm and a length of 30 nm. In half cell tests, the Pt–Co NWs/C catalyst has a mass activity of 291.4 mA mgPt−1, which is significantly better than commercial Pt/C catalysts with 85.5 mA mgPt−1. And after the accelerated durability test (ADT), Pt–Co NWs/C shows an electrochemically active surface area (ECSA) loss of 19.1% while the loss in the commercial catalyst is 41.8%. Also, the membrane electrode assembly (MEA) was prepared using Pt–Co NWs/C as the cathode catalyst, resulting in a maximum power density of 952 mW cm−2, which is higher than that of Pt/C. These results indicate that the one-dimensional structure of the catalyst prepared herein is favorable to improve the activity and durability, and the application of the catalyst in the MEA is also realized.
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高影响因子
Science Bulletin
·
2018
·
IF 4.136
Qingfeng Xu,Wenlong Chen,Yucong Yan,Zhemin Wu,Yi Jiang,Junjie Li,Ting Bian,Hui Zhang,Jianbo Wu,Deren Yang
Incorporating Pt with core metals into Pt-based core-shell catalysts is regarded as a promising strategy to substantially enhance the catalytic properties towards oxygen reduction reaction (ORR) in fuel cells due to the synergetic effect between distinct metals. In this wok, ultrathin Pt skins with two atomic layers were epitaxially coated on as-prepared icosahedral Au 50 Pd 50 , Au 60 Pd 40 and Au 66 Pd 34 nanocrystal seeds, which are constructed with alloyed cores and Pd shells with different thickness. Through electron microscopic characterizations, Pd interlayers with tunable thickness of 3, 6, and 12 atomic layers can be found in the Au 66 Pd 34 @Pt, Au 60 Pd 40 @Pt and Au 50 Pd 50 @Pt icosahedra, respectively. These icosahedral AuPd@Pd@Pt nanocrystals show substantially enhanced activities and durabilities in electrocatalytic measurements towards ORR compared to Au 75 Pd 25 @Pt icosahedra without Pd interlayer and commercial Pt/C catalysts. Specifically, Au 60 Pd 40 @Pt icosahedra with 6 atomically thick Pd interlayer display the best electrocatalytic performances, whose mass activities before and after durability tests of 50,000 cycles are 11.6 and 30.2 times, respectively, as high as that of the commercial Pt/C.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2015
·Vol. 162
·期 6
·H415
·
IF 3.266
Mingshu Xiao,Xiaocai Liang,Weiwei Li,Yang Yang,Yuqing Miao
Here, the ultrafine Pt/Pd bimetallic nanoparticles (Pt/Pd NPs) were synthesized and decorated on the multi-walled carbon nanotubes (MWCNTs) modified glassy carbon electrode (GCE) for hydrogen evolution. Pt/Pd NPs were synthesized through the reduction of their metal salt mixture with tert-butylamine as reductant and polyvinylpyrrolidone as protectant. Under the observation of transmission electron microscopy (TEM), the well dispersed Pt/Pd NPs exhibit the ultrafine size of about 13 nm diameter with the good crystallinity corresponding to the (111) planes of face-centered cubic (fcc) Pt and the (200) planes of fcc Pd. The scanning electron microscopy (SEM) also shows the dispersion and anchor of Pt/Pd NPs in the matrix of MWCNTs. Electrochemical study confirms the good electrocatalytic hydrogen evolution of Pt/Pd-MWCNT in 0.5 M H2SO4, exhibiting a potential application in the future for hydrogen based energy transformation and storage.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Kai Yuan,Yiqing Zeng,Jinxin Gan,Zhaoxiang Zhong,Weihong Xing
Catalytic membranes can achieve the simultaneous purification of particulate matter (PM) and gaseous pollutants, and their performance depends on the design of a catalyst and its combination with a membrane material. Herein, a novel Pt@CNTs/SiC catalytic membrane composed of a Pt@CNTs (carbon nanotubes) membrane layer and a porous SiC support was developed for the simultaneous removal of formaldehyde and PM at room temperature. The CNT membrane layer underwent vertically integrated growth on a porous SiC support, which provided the catalytic membrane with a pore size of 7.4 μm and a high gas permeance of 240.2 m3·m–2·h–1·kPa–1. The loading of Pt particles on CNTs slightly decreased the gas permeance of the catalytic membrane (219.9 m3·m–2·h–1·kPa–1) but endowed the membrane with catalytic formaldehyde degradation performance. The obtained Pt@CNTs/SiC catalytic membrane with a 240 μm thick CNT layer and 0.8% Pt loading exhibited 99.999% filtration efficiency for 300 nm SiO2 (face velocity = 1 m/min) and 72.1% formaldehyde degradation (gas flow = 49 mL/min), implying that the Pt@CNTs/SiC membrane has good application potential in the collaborative removal of various air pollutants.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 7
·4666-4676
·
IF 3.553
Wang Pan,Tian Xuemin,Yan Meng,Yang Boxuan,Hua Zhongqiu
In this study, a catalytic-type combustible gas sensor was fabricated by the screen-printing method. Pt supported catalysts (Pt-HZSM5) were prepared by a wet impregnation method using HZSM5 zeolite as support. It was found that Pt-HZSM5 catalysts have a highly catalytic activity to H 2 and CO at low temperatures and a selectively and fully combustible was observed at only 150 °C. A good dispersion state of Pt nanoparticles on HZSM5 zeolite particles was beneficial for the catalytic oxidization of CO and H 2 . However, a high loading amounts lead to a poor dispersion state and a weak catalytic activity. The thick film sensor based on Pt-HZSM5 catalyst was found to be highly sensitive to combustible gas with a good linearity up to 2% and a limitation of detection (LOD) around 50 ppm. Due to the low operation temperature, a highly selectivity was obtained for CO and H 2 and no cross-sensitivity to interfering gases such as CH 4 and VOCs. It was indicated that the present developed catalytic-type gas sensors could be used for the leakage detection and monitor for H 2 and CO with a low power consumption and a good selectivity.
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高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Nurbiye Sawut,Ruxangul Jamal,Tursun Abdiryim,Ahmat Ali,Ayigul Kadir,Zulpikar Helil,Mariyam Niyaz,Yajun Liu
It is important to select an appropriate supporting matrix, which can probably improve the electro-catalytic activity of Pt and reduce the Pt loading. In this paper, a composite (PProDOT-2MeOH:PSS/YRFC/Pt) comprising hydroxyl‑grafted poly(3,4-propylenedioxy thiophene):polystyrene sulfonate(PProDOT-2MeOH:PSS), resorcinol-formaldehyde yolk-shell carbon sphere (YRFC) and Pt nanoparticles is fabricated as electrocatalyst for methanol and ethanol electrooxidation . The PProDOT-2MeOH:PSS is uniformly coated on the YRFC, which enhances the conjugation degree of polymer and the dispersion of Pt nanoparticles to facilitate the mass transfer during catalytic reactions . PProDOT-2MeOH:PSS/YRFC/Pt has a larger electrochemical active surface area (61.02 m 2 g −1 ) than commercial 20 wt% Pt/C (17.1 m 2 g −1 ), which is resulted from anchoring sites of S atom in PProDOT-2MeOH:PSS/YRFC. The composite displays excellent electrochemical performance for ethanol and methanol oxidation with the mass activity of 1077 mA mgPt −1 and 689 mA mgPt −1 , respectively. The composite had satisfactory anti CO tolerance from the contribution of the high conductivity of PProDOT-2MeOH:PSS and YRFC. The composite also exhibits favorable cyclic stability, due to noncovalent bonding between constituents and the yolk-shell structure. These results indicate that PProDOT-2MeOH:PSS/YRFC/Pt is a promising catalyst for direct fuel cell applications .
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 50
·期 2
·543-553
·
IF 1.774
Deng Lu,Xu Quan,Rao Liangmei,Yue Ruirui,Xu Jingkun,Duan Xuemin
In this paper, Pt/Pd-poly(3,4-ethylenedioxythiophene)/nitrogen doped graphene (Pt/Pd-PEDOT/NGE) nanocomposites with hierarchical structure were prepared via a one-pot method. In the first step, Pd-PEDOT composites with Pd nanoparticles scattered on the surface or embedded in coralloid PEDOT particles were obtained through the redox reaction between PdCl 4 2− and 3,4-ethylenedioxythiophene (EDOT) monomer. NGE was then added to improve the electrical conductivity and continuity of the nanocomposites. Finally, the added PtCl 6 2− as well as the residual PdCl 4 2− was reduced by ethanol through heating reflux. As a result, the Pt/Pd-PEDOT/NGE nanocomposites were obtained with Pt and Pd nanoparticles well-dispersed on the surfaces of PEDOT granules and NGE nanosheets. The obtained Pt/Pd-PEDOT/NGE nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS), x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), and Raman spectra. The electrochemical sensing performance of the Pt/Pd-PEDOT/NGE modified glassy carbon for caffeic acid (CA) was mainly studied by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Under optimized conditions, Pt/Pd-PEDOT/NGE showed superior electrochemical sensing performance for detecting CA with the linear relationship ranging from 0.008 μM to 46 μM and a detection limit of 2.7 nM (a signal to noise ratio of 3 ( S / N = 3)). Moreover the nanocomposite also possesses high anti-interference capability and reproducibility. The real sample analysis of Pt/Pd-PEDOT/NGE was successfully carried out, implying the promising application of CA detection in food and beverages.
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高影响因子
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