INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
·
IF 3.582
Gen Liu,Zhanchang Pan,Bo Zhang,Jun Xiao,Guowei Xia,Qixiang Zhao,Shikun Shi,Guanghui Hu,Chumin Xiao,Zhigang Wei,Yanbin Xu
The application of direct methanol fuel cells (DMFCs) is hampered by not only low activity but also poor stability and poor CO tolerance by the Pt catalyst . Herein, a novel titanium nitride coated multi-walled carbon nanotubes (CNTs@TiN) hybrid support was successfully synthesized by a facile solvothermal process followed by a nitriding process , and this hybrid support was used as Pt support for the oxidation of methanol. The structure, morphology and composition of the synthesized CNTs@TiN exhibits a uniform particle perfect coating with high purity and interpenetrating network structure. Notably, Pt/CNTs@TiN also showed excellent stability, experiencing only a slight performance loss after 5000 potential cycles. The onset potential (0.34 V) of CO oxidation on Pt/CNTs@TiN is obviously more negative than that on the Pt/TiN (0.38 V) and Pt/CNTs (0.48 V) in the first forward scan. In the Pt 4f XPS spectra, plentiful Pt atoms existed as Pt(II) in the Pt/CNTs and Pt/TiN catalysts, while a relatively smaller amount of Pt(II) was observed in the Pt/CNTs@TiN catalyst. The synthetic Pt/CNTs@TiN catalyst was studied with respect to its electrocatalytic activity and durability and CO tolerance toward methanol oxidation might be mainly attributed to the strongly coupled Pt–TiN and the fast electron-transport network structure. This work may provide more insight into developing novel catalyst supports of various transition metal nitrides coated CNTs for DMFCs with high activity and good durability and excellent CO tolerance.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2017
·
IF 1.174
Yuedong Zhou,Fengfu Li,Junwei Liu,Zhi Yun,Xia Gui
The liquid phase ring-opening of octamethylcy-clotetrasiloxane (D 4 ) was investigated over Pt-H 2 SO 4 /Zr-montmorillonite catalyst. Montmorillonite (Mt), Zr-Mt, H 2 SO 4 /Mt, H 2 SO 4 /Zr-Mt and Pt-H 2 SO 4 /Zr-Mt were also detected for evaluation. The catalysts were characterized by X-ray fluorescence, X-ray diffraction, nitrogen adsorption–desorption, NH 3 -TPD and pyridine-FTIR measurements. In comparison to activate clay which is used in the industry of catalyst, Zr-Mt catalyst displayed stronger acidity and more excellent catalytic activity in the polymerization of D 4 , polymethylhydrosiloxane (D 4 H ) and hexamethyldisiloxane (MM) to low-hydro silicone oil. Relative to Zr-Mt, the acidity of H 2 SO 4 /Zr-Mt was noticeably improved and the catalyst exhibited a higher capability of ring-opening of D 4 conversion and yield of low-hydro silicone oil. To enhance the stability of H 2 SO 4 /Zr-Mt catalyst, a small amount of metals (Pt) was doped. The nitrogen adsorption–desorption results indicated that pore textural parameters of the Pt-H 2 SO 4 /Zr-Mt had not changed with larger specific surface area. Compared with H 2 SO 4 /Zr-Mt, the total acidity of Pt-H 2 SO 4 -Zr/Mt catalyst retained, but the content of the Brønsted acid increased and the content of the Lewis acid decreased. The Pt-H 2 SO 4 -Zr/Mt catalyst displayed higher catalyst reproducibility. After 40 h reaction of polymerization, the yield of low-hydro silicone oil decreased from 93% to 42% over H 2 SO 4 /Zr-Mt catalyst, while the yield of low-hydro silicone oil reduced from 93% to 78% over Pt-H 2 SO 4 /Zr-Mt catalyst. A sharp decrease in catalytic activity after 35 h of Pt-H 2 SO 4 /Zr-Mt catalyst was detected. Furthermore, Pt-H 2 SO 4 /Zr-Mt was completely regenerated under appropriate condition and appeared good repeatability in the D 4 , D 4 H and MM to low-hydro silicone oil.
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NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 4
·3225-3232
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IF 3.277
Han Zheng,Changhua Wang,Xintong Zhang,Lina Kong,Yingying Li,Yunyu Liu,Yichun Liu
Multi-heterojunctions are more promising than single-heterojunctions in photocatalysis due to the availability of more interfaces between each component. However, photocatalytic activity is highly dependent on the contact mode of individual components. In this work, we assemble TiO2–WO3–Pt multi-heterojunction microspheres using ultrasonic spray pyrolysis and focus on their contact mode governed photocatalytic activity. The results reveal that using highly crystalline WO3 nanosheets as building blocks could particularly enhance the photocatalytic activity of a TiO2/WO3 system toward the degradation of gaseous acetaldehyde and isopropyl alcohol. Furthermore, loading Pt nanoparticles onto WO3 nanosheets could facilitate a more prominent enhancement of activity than that of TiO2/Pt, benefiting from the two-electron reduction of oxygen at the interface of WO3/Pt. Meanwhile, the high crystallinity of WO3 nanosheets allows for a loading amount of Pt as low as 0.04 wt% in the TiO2–WO3–Pt system, which reduces the catalyst cost in comparison with that of the conventional amount of 1 wt%.
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ANALYST
·
2016
·Vol. 141
·期 9
·2741-2747
·
IF 4.033
Shuang Ren,Huan Wang,Yufan Zhang,Yuena Sun,Lanfen Li,Hongyi Zhang,Zhihong Shi,Mingjie Li,Meng Li
By employing dopamine as a nitrogen source and reducing agent, the block copolymer P123 as a pore forming agent, and graphene oxide as a carbon precursor, we present, for the first time, a convenient and controllable approach to the preparation of a novel uniformly nitrogen doped porous graphene (N-PGR) material. Using the prepared N-PGR as the supporting material, a novel nitrogen doped porous graphene/Pt nanoflower material (Pt/N-PGR) was obtained by a green and simple method. The characterization results of scanning electron microscopy (SEM), element mapping, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) demonstrate that Pt nanoflowers are uniformly dispersed on nitrogen doped porous graphene. Electrochemical measurements show that Pt/N-PGR-900/GCE exhibits improved electrocatalytic activity towards H2O2 reduction and glucose oxidation. Linear responses are found for H2O2 and glucose in the range of 0.5–40 326 μM and 0.5–133.5 mM with the detection limit (S/N = 3) of 0.2 μM and 0.05 mM, respectively. In addition, Pt/N-PGR-900/GCE exhibits high sensitivity and good anti-interference ability. The superior catalytic activity and selectivity make Pt/N-PGR a promising nanomaterial for application in electrochemical biosensing studies.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Bin Tian,Jinlong Lei,Jiahai Wang
A large surface area of catalytic sites and low electric resistance are desirable properties for electrocatalysts that lower the overpotential required for electrochemical reactions, such as the hydrogen evolution reaction (HER), in this study. In the presence of polyoxometalate (POM) and triblock copolymer pluronic (P123) as a hybrid soft template, the hydrothermal sulfurization of nickel foam leads to the formation of a hollow microsphere, assembled from the Ni3S2 motif. Sonication for preparing POM+P123 hybrids, while adjusting the POM content, is an effective strategy for synthesizing a Pt-like electrocatalyst with excellent hydrogen evolution efficiency. The reason is that both sonication and optimal POM content can simultaneously enhance the electroactive surface area and electron transfer of the Ni3S2 electrocatalyst. Adopting the optimal conditions, the three-dimensional porous network, composed of Ni3S2 hollow microspheres on the nickel foam, shows that the HER in an alkaline medium requires only 77 mV overpotential for a current density of 10 mA cm–2, with a robust long-term stability during a 25 h test. The performance at a large current density outperforms the current benchmark electrocatalyst (Pt) for HER.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Na Li,Jing-Ru Huang,Hong-Yue Zhang,Min Cui,Bao Sun,Cong Zhang,Hai-Yan Zhao
Hydroquinone (HQ) and catechol (CC) are isomers with similar structures, which destroyed ecosystem balance and human health at an alarming rate. Therefore, it is critical to monitor HQ and CC in the environment simultaneously. Herein, a sensitive electrochemical sensor based on multiwalled carbon nanotubes and covalent polyoxometalate-organic frameworks (CPOFs) modified by nanoparticles (PtNPs@CPOFs-MWCNTs) was designed for the simultaneous detection of HQ and CC. Polyoxometalates (POMs) have been extensively studied in the area of electrochemical sensors because of rich reversible multielectron redox behavior. The porous and long stick-shaped CPOFs was synthesized by solvothermal Schiff base reaction, with NH2-POM-NH2 and 2,5-dimethoxy-phenyl-1,4-diformaldehyde as monomers. Using the porosity and large surface area of CPOFs, the obtained PtNPs@CPOFs nanocomposite showed an improved distribution of electroactive sites. At the same time, highly conductive MWCNTs was incorporated to guarantee the conductivity. Consequently, PtNPs@CPOFs-MWCNTs was obtained to improve the electrical conductivity and electrocatalytic activity. The results showed that the PtNPs@CPOFs-MWCNTs/GCE performed a wide range and low detection limit toward the detection of HQ and CC simultaneously. Furthermore, PtNPs@CPOFs-MWCNTs/GCE also had great stability and anti-interference ability.
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Materials Today Bio
·
2025
·
IF 10.2
Yanan Wang,Nan Cheng,Qi Zhang,Fei Chang,Teng Wang,Minrui Kan,Yutong Han,Baiqiang Zhai,Kunlun Huang,Xiaoyun He
Recently, the nanozyme Pd@Pt has garnered attention due to its notable specific surface area and superior enzyme-like catalytic activity, leading to extensive examination and application in previous studies. However, the comprehensive impact of Pd@Pt nanozyme on treating metabolic disorders, such as diabetes and its associated conditions, remains largely unexplored. This research aimed to clarify how Pd@Pt influences metabolic balance at both the transcriptome and microbiome levels and to explore the interactions between microbiota and genes. We conducted an examination of mice subjected to a high-fat diet (HFD) following treatment with Pd@Pt. Transcriptome analysis was performed to identify differentially expressed genes (DEGs), and microbiome analysis was conducted to identify significant bacterial correlations associated with Pd@Pt exposure. The results indicated enhancements in glucose metabolism dysfunctions in the treated mice. Transcriptome analysis revealed that DEGs after Pd@Pt administration were enriched in the PI3K-Akt, NF-κB, and MAPK signaling pathways in the liver. Microbiome analysis identified four significant bacteria that exhibited a strong negative correlation with Pd@Pt exposure, while ten bacteria showed a positive correlation. Furthermore, a correlation network established among the gut microbiota, metabolites, and DEGs demonstrated a robust association. This research enhances our understanding of the mechanisms by which Pd@Pt affects the regulation of metabolic diseases in HFD-exposed environments and proposes a novel strategy for utilizing nanozymes in human health management.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Qingshan Dai,Jiarui Huang,Xia Qiu,Nannan Wang,Dongmei Wang,Yongxin Li
Investigating the kinetics and mechanisms of catalytic hydrogenation reaction is important for fundamental research and chemical engineering, especially at single nanowire/nanoparticle level. In this work, we constructed a dual-functional single Pt@Au nanowire (Pt@Au NW) reaction platform, which was used for in-situ monitoring the p-nitrothiophenol (4-NTP) catalytic reduction process by using surface-enhanced Raman scattering (SERS) and UV–vis spectroscopy. The conversion of reactants and intermediates as well as the product generation during the reaction process were analyzed carefully, and the influencing factors of temperature and light were also discussed. Moreover, the density functional theory (DFT) was used to further investigate the effect of the single Pt@Au NW on catalytic hydrogenation reaction of 4-NTP. The results show that the single Pt@Au NW can be a good platform for in-situ monitoring catalytic hydrogenation reaction of 4-NTP with excellent catalytic activity, high stability, and good reproducibility, and clarified that trans -dimercaptoazobenzene ( trans -DMAB) intermediates were produced that are further converted to the p-aminothiophenol (4-ATP). The work will not only give researchers new insights into the combination of the single nanowire/nanoparticle with spectroscopic techniques, but may also inspire further in-depth studies of multifunctional catalysts for catalytic hydrogenation reaction at single entity level.
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JOURNAL OF MEDICINAL CHEMISTRY
·
2025
·
IF 6.8
Zhe Li,Xiao-Meng Liu,Fei Tan,Jia-Qian Wang,Xin Qiao,Yu-Kuan Feng,Jing-Yuan Xu,Ji-Hui Hao
Convincing evidence revealed that some platinum-based drugs could stimulate immunological recognition, thereby inducing immunogenic cell death (ICD). Indoleamine-2,3-dioxygenase (IDO) is overexpressed in tumors, which caused exhaustion of tryptophan (T-cell energy) and constructed an immunosuppressive tumor microenvironment. Herein, considering IDO inhibition to improve chemotherapy, a series of IDOi-Pt(IV) prodrugs were designed to not only target DNA and IDO but also facilitate tumor-antigen exposure and immunomodulation. The optimal IDOi-Pt(IV) prodrugs (named compound 10) significantly enhanced intracellular accumulation 22.4-fold and cytotoxicity 61.75-fold superior to cisplatin in HeLa cells. Moreover, immunofluorescence and enzyme-linked immunosorbent assays revealed that 10 induced reactive oxygen species-mediated endoplasmic reticulum stress and secretion of damage-associated molecular patterns, thereby presenting ICD effects. Molecular docking, enzyme inhibition, and Western blot assays demonstrated that 10 could effectively inhibit IDO1 and reverse immunosuppression, as further verified by mixed leukocyte reactions. In vivo tests showed that 10 exhibited high-efficiency and low-toxicity antitumor effects compared to cisplatin, presenting successful chemoimmunotherapy.
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Scientific Reports
·
2018
·Vol. 8
·期 1
·1-13
·
IF 4.122
Zhang Xiaoyan,Xu You,Zhang Junjie,Dong Shuai,Shen Liming,Gupta Arunava,Bao Ningzhong
Two-dimensional (2D) semiconducting nanomaterials have generated much interest both because of fundamental scientific interest and technological applications arising from the unique properties in two dimensions. However, the colloidal synthesis of 2D quaternary chalcogenide nanomaterials remains a great challenge owing to the lack of intrinsic driving force for its anisotropic growth. 2D wurtzite Cu 2 ZnSnS 4 nanosheets (CZTS-NS) with high-energy (002) facets have been obtained for the first time via a simple one-pot thermal decomposition method. The CZTS-NS exhibits superior photoelectrochemical activity as compared to zero-dimensional CZTS nanospheres and comparable performance to Pt counter electrode for dye sensitized solar cells. The improved catalytic activity can be attributed to additional reactive catalytic sites and higher catalytic reactivity in high-energy (002) facets of 2D CZTS-NS. This is in accordance with the density functional theory (DFT) calculations, which indicates that the (002) facets of wurtzite CZTS-NS possess higher surface energy and exhibits remarkable reducibility for I 3
− ions. The developed synthetic method and findings will be helpful for the design and synthesis of 2D semiconducting nanomaterials, especially eco-friendly copper chalcogenide nanocrystals for energy harvesting and photoelectric applications.
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JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Shunxing Li,Jiabai Cai,Xueqing Wu,Biwen Liu,Qiaoying Chen,Yuehai Li,Fengying Zheng
An solar-light-driven and bifunctional photocatalyst was designed for photo-reduction of Cr(VI) and selective photo-oxidation of benzyl alcohol into benzaldehyde in the presence of water under ambient conditions. Double-shelled and sandwiched TiO 2 @Pt@CeO 2 hollow spheres were prepared by using functionalized polystyrene spheres, sol-gel, hydrothermal reaction, and calcination. The Pt nanoparticles (NPs) were controllably loaded between the TiO 2 shell and CeO 2 shell. Under solar-light irradiation, the photo-reduction rate of Cr(VI) (μmol h −1 ) was in the order of TiO 2 @Pt@CeO 2 (1.901) > TiO 2 @CeO 2 (1.424) > TiO 2 (1.040) > CeO 2 (0.992). Among the above-mentioned photocatalysts, the conversion rate of benzyl alcohol for TiO 2 @Pt@CeO 2 was also the best. These results were attributed to the combination of TiO 2 and CeO 2 as photocatalyst and oxygen buffer, the double-shelled and sandwiched nanostructure, and the addition of Pt NPs as cocatalyst and electron trap site, which could store and shuttle photo-generated electrons, reduce the recombination of the electron-hole, and then enhance photo-generation of active radicals. This conclusion was verified by the electron paramagnetic resonance (EPR) spectroscopy. Considering the versatile combination of photocatalyst, oxygen buffer and cocatalyst, this work could provide new insights into the design of high-performance bifunctional photocatalysts for heavy metal removal and selective synthesis.
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FUEL
·
2024
·
IF 6.7
Hongli He,Jie Yang,Bo Kang,Mingxin Lv,Enhui Du,Zhilin Chen,Weiping Xie,Liyuan Huai,Hualei Hu,Chunlin Chen,Jian Zhang
Catalytic performances of supported metal catalysts are highly affected or even dominated by supports. Here, the manganese oxide octahedral molecular sieves (OMS-2) supported Pt nanoparticles (Pt/OMS-2) show specific selectivity in the hydrogenation of 5-hydroxymethylfurfural to 2,5-bis(hydroxymethyl)furan (BHMF) in liquid water, without ring-hydrogenation or ring-opening, even under harsh conditions. a 97.6 ± 2.1 % yield of BHMF was obtained over Pt/OMS-2 within 2 h at 30 °C and 1.5 MPa H 2 . This specific selectivity was attributed to a vertical adsorption model of BHMF at the interface, where an O atom and H atom of hydroxyl attached to the Mn and O 2− sites. The hydrogenation of the C O bond followed hydroxy routes through a water-mediated mechanism. Specifically, a water molecule facilitated the transfer of hydrogen atoms between the carbonyl group and the Pt surface, with the cleavage of O H bonds being a key step in the overall process.
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