ADVANCED FUNCTIONAL MATERIALS
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2024
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IF 18.5
Junge Yang,Jinxian Feng,Youpeng Cao,Yuxuan Xiao,Lulu Qiao,Keyu An,Jiao Yang,Jing Peng,Hui Pan,Hui-Ming Cheng
An efficient and stable electrocatalyst is key for the production of green hydrogen using water electrolysis. However, the weak dissociation ability of Pt-based catalysts, resulting in slow kinetics severely hampers its applications in alkali medium. Herein, a simple “coincident reduction” strategy is reported to grow highly dispersed Ru-Pt heterogeneous bimetallic nanoparticles on reduced graphene oxide (Ru x Pt y @rGO) for efficient pH-universal hydrogen evolution. Ru x Pt y @rGO has superior catalytic activity at all pH values due to the synergistic effect between Ru and Pt and the ultra-small nanoparticle. In particular, the catalyst with 13.6 wt% of noble metal (Ru 1 Pt 2 @rGO) has low overpotentials of 9, 6, and 36 mV at 10 mA cm −2 in 1 m KOH, 0.5 m H 2 SO 4 and 1 m phosphate buffer solution (PBS), respectively, which outperformances monometallic counterparts and comparable to the best bimetallic catalysts ever reported. The catalyst is highly stable because of the strong bonding between the bimetallic nanoparticle and rGO. Mechanism studies show that Ru 1 Pt 2 @rGO has a faster Volmer–Tafel mechanism in alkali, high-efficient H + transfer and increased H adsorption ability in acid, resulting in superior reaction kinetics. This work provides a new route for mass production of high-performance catalysts for practical applications at all pH values.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Junxin Guo,Zhenyu Wang,Tongtong Gao,Zhao Wang
Binary Pd/In 2 O 3 and Pt/In 2 O 3 catalysts exhibit technological potential in CO 2 methanol synthesis. However, the key to achieving high productivity lies in resolving the unfavorable Pd-In alloy and Pt nanoparticles formation during the reaction. In this study, we present the surface restructuring of Pd-Pt/In 2 O 3 catalysts under CO 2 hydrogenation conditions. Detailed quasi-operando characterization and theory calculation reveal stable reconstruction driven by Pt with Pd. The bimetallic Pd-Pt inhibits the formation of both Pd-In alloy and Pt nanoparticles. Moreover, this restructuring process generates more oxygen vacancies during the reaction. These oxygen vacancies promote electron transfer from the indium oxide surface to the Pd-Pt clusters. Consequently, a shift occurs from interface-induced CO 2 adsorption to cluster-induced adsorption. Thereby, the STY of methanol on Pd-Pt/In 2 O 3 at 300 °C increased by approximately 20 % compared to that on Pd/In 2 O 3 along. The findings highlight the crucial role of component-induced restructuring and oxygen vacancies in influencing the change of adsorption sites.
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JOURNAL OF CONTROLLED RELEASE
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2024
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IF 10.5
Min Liao,Qi Zhang,Jianbo Huang,Xiaotong Huang,Chong Cheng,Juan Tu,Dong Zhang,Qiang Lu,Lang Ma
Owing to the dense extracellular matrix and high interstitial fluid pressure in the tumor microenvironment, methods which enhance the permeation and retention of nano drugs into liver tumors remain unsatisfactory for successful tumor treatment. We designed a near-infrared (NIR)- and ultrasound (US)-triggered Pt/Pd-engineered “cluster bomb” (Pt/Pd-CB) which actively penetrates liver cancer cell membranes and achieves photothermal and sonodynamic therapy (SDT). The physical forces generated by the fast expansion and collapse of perfluoropentane nanodroplets eject “sub bombs” (Pt/Pd nanoalloys) into liver cancer cells upon activation by NIR and US. Pt/Pd nanoalloys can then convert H 2 O 2 into O 2 to alleviate hypoxia and boost SDT efficiency while exhibiting a highly efficient photothermal response under NIR irradiation. Our findings might especially be promising for the treatment of solid tumors.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Yunshi Liu,Xing Gao,Feng Li,Geyu Lu,Tong Zhang,Nicolae Barsan
Pt-loaded In 2 O 3 mesoporous nanofibers (NFs) have been prepared by electrospinning, followed by a facile reduction method. The sample obtained by adding tea saponin into the spinning solution, sample In-TS, displays a more than 4 times higher specific surface area, value of 86.9 m 2 g −1 , than that of conventionally prepared samples. The loading with small-sized Pt nanoparticles (NPs) determines excellent gas sensing performance towards NO 2 down to ppb level (R g /R a = 2.8 to 10 ppb and 23.9–1 ppm) at room temperature (RT), by that significantly lowering the power consumption. The reason is that the open pores and channels on the mesoporous NFs generated by the foaming agent not only promote the adsorption and desorption of NO 2 molecules on the sensing layers, but also improves the transduction function of the sensors by ensuring that there are no parts of the fiber that are not accessible to the gases. The introduction of Pt to the mesoporous NFs could accelerate the dissociation of absorbed oxygen and the active surface reactions in NO 2 owing to the catalytic property and chemical sensitization of well-dispersed Pt NPs. Due to the unique gas sensing performance, sample In-TS-Pt has a prospect for applications in low-concentration NO 2 detection at RT.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Fen Wang,Wei-Zhen Li,Jing-Dong Lin,Zhi-Qiang Chen,Yong Wang
Catalyst durability is one of the major problems hindering the commercialization of partial oxidation of methane (POM) for syngas production. We report that a Pt/MgAl 2 O 4 -HS catalyst with the MgAl 2 O 4 -HS support being synthesized via hydrolysis solvothermal (HS) method demonstrates high stability for POM during a 500 h life testing at 900 °C without detectable coke formation, while a Pt/MgAl 2 O 4 -CP counterpart in which MgAl 2 O 4 was prepared by an optimized co-precipitation (CP) method exhibits continuous deactivation accompanied by coking. Using a suite of characterizations incluidng BET, H 2 chemisorption, XRD, STEM, TEM, TG/DTA and TPD of NH 3 and CO 2 , we reveal that the high catalytic durability of the Pt/MgAl 2 O 4 -HS is due to the spinel surface of MgAl 2 O 4 -HS that can efficiently stabilize Pt against sintering. The Pt/MgAl 2 O 4 -CP, however, has defect Al 2 O 3 or MgO-like species on the MgAl 2 O 4 -CP surface, inhibiting its capability to stabilize Pt. We confirm that the POM reaction undergoes a combustion-reforming pathway by monitoring the temperatures and gaseous product compositions along the catalyst bed. These results provide guidance for rational design of a longevity catalyst for POM process.
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Catalysis Science & Technology
·
2018
·Vol. 8
·期 6
·1621-1631
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IF 5.365
Yuxi Gao,Xiaodong Wu,Robin Nord,Hanna Härelind,Duan Weng
The sulphur resistance and regeneration strategy of soot oxidation catalysts are critical to the application of catalytic diesel particulate filters (CDPFs). In the present work, Pt/MnOx–CeO2/Al2O3, Pt/Al2O3 and MnOx–CeO2/Al2O3 catalysts were sulphated and regenerated with ammonia. The soot oxidation activity of poisoned Pt/MnOx–CeO2/Al2O3 was recovered completely after 30 min reduction in 500 ppm NH3 at 550 °C. The amount, distribution and structure of sulphates were studied comprehensively for the sulphated and regenerated samples by thermogravimetric analysis (TGA), infrared (IR) spectroscopy, CO chemisorption and transmission electron microscopy (TEM). The NO oxidation of Pt catalysts was found to depend strongly on the particle size distribution, surface exposure and oxidation state of the precious metal. This, as well as the effect of the remaining surface sulphates, helped the regenerated catalysts achieve even higher catalytic activity for soot oxidation.
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International Journal of Nanomedicine
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2024
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IF 6.6
Jianmei Lu,Yongzhu Zeng,Huashuai Zhong,Wei Guo,Yuyan Zhang,Wanting Mai,Yucui Qin,Xiaodan Su,Bo Zhang,Weisen Wu,Yu Zhu,Qiujie Huang,Yong Ye
Background and Purpose Nitidine chloride (NC) is a botanical drug renowned for its potent anti-inflammatory, antimalarial, and hepatocellular carcinoma-inhibiting properties; however, its limited solubility poses challenges to its development and application. To address this issue, we have devised a colon-targeted delivery system (NC-CS/PT-NPs) aimed at modulating the dysbiosis of the gut microbiota by augmenting the interaction between NC and the intestinal microbiota, thereby exerting an effect against nonalcoholic fatty liver disease.Methods The NC-CS/PT-NPs were synthesized using the ion gel method. Subsequently, the particle size distribution, morphology, drug loading efficiency, and release behavior of the NC-CS/PT-NPs were characterized. Furthermore, the impact of NC-CS/PT-NPs on non-alcoholic fatty liver disease (NAFLD) induced by a high-fat diet (HFD) in mice was investigated through serum biochemical analysis, ELISA, and histochemical staining. Additionally, the influence of NC-CS/PT-NPs on intestinal microbiota was analyzed using 16S rDNA gene sequencing.Results The nanoparticles prepared in this study have an average particle size of (255.9±5.10) nm, with an encapsulation rate of (72.83±2.13) % and a drug loading of (4.65±0.44) %. In vitro release experiments demonstrated that the cumulative release rate in the stomach and small intestine was lower than 22.0%, while it reached 66.75% in the colon. In vivo experiments conducted on HFD-induced NAFLD mice showed that treatment with NC-CS/PT-NPs inhibited weight gain, decreased serum aspartate aminotransferase (AST), Alanine aminotransferase (ALT) and lipid levels, improved liver and intestinal inflammation, and altered the diversity of gut microbiota in mice.Conclusion This study provides new evidence for the treatment of NAFLD through the regulation of gut microbiota using active ingredients from traditional Chinese medicine.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2024
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IF 8.2
Lin Zhu,Wei Zeng,Yueqing Li,Yu Han,Jing Wei,Long Wu
In this work, on the basis of Fe 3 O 4 @Au-Pt nanozymes (MAP NZs) and aptamer recognition, a magnetic fluorescent aptasensor (MFA) was developed for sensitive and accurate detection of saxitoxin (STX). With the bridge of STX aptamer (Apt STX ) and complementary DNA (cDNA), Apt STX decorated MAP NZs (MAP/Apt) and cDNA modified green quantum dots (cDNA@g-QDs) were connected to form MAP/Apt-cDNA@g-QDs complex. As STX behaves a strong binding ability towards Apt STX , it will compete with cDNA and hybridize with Apt to release cDNA@g-QDs. With the addition of TMB, MAP will catalyze TMB to the oxidized TMB (ox-TMB), thereby quenching the fluorescence of g-QDs due to the inner filter effect. Based on this finding, the quantitative relationship between the change in fluorescence of gQDs and STX concentration was explored with a limit of detection (LOD, S/N = 3) of 0.6 nM. An internal standard signal of oxTMB was adopted and reduced the fluctuation of fluorescence signal output. Besides, the fluorescence probe can selectively recognize and detect STX among five marine toxins. Eventually, the MFA method behaved good performance in detecting seafood samples with recoveries of 82.0 % ∼ 102.6 % as well as coefficient of variations (CV) of 7.2 % ∼ 10.3 %. Therefore, the method with internal signal is hopeful to be a potential candidate for sensitive and accurate detection of STX in seafood.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Changxu Li,Beibei Yan,Dahai Pan,Feng Yu,Xiaoliang Yan,Shuwei Chen,Binbin Fan,Ruifeng Li
Mesoporous alumina (MA) materials with outstanding textural properties have been synthesized by a facile approach, and were evaluated as supports of Pt-based catalyst for methylcyclohexane dehydrogenation . At 300 °C, the resultant catalyst demonstrates a much higher activity with a maximum hydrogen evolution rate of 2081 mmol/g Pt /min in comparison with the state-of-the-art alumina supported Pt catalysts. Interestingly, even after a long-time reaction of 100 h or regeneration, more than 80% of original activity was still maintained. The superior catalytic performance of the obtained catalyst is associated with the high specific surface area and large mesoporous size of support MA, thus benefiting the increase in the number of Pt active sites and efficiently inhibiting the formation of coke deposition during the reaction. Our contribution has provided a rational design strategy for highly efficient and stable dehydrogenation catalysts, which is a key for the utilization of methylcyclohexane-toluene system in hydrogen storage technology.
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Catalysis Science & Technology
·
2024
·Vol. 14
·期 12
·3436-3447
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IF 4.4
Kok Bing Tan,Yiping Liu,Youting Wang,Sajid Ali,Wendong Wang,Jingru Li,Longmei Shang,Xing Yan,Xiaodong Zhang,Guowu Zhan
In this study, three different metal oxides derived from metal–organic frameworks (MOFs), including CeO2, ZrO2, and Fe2O3 were used as porous supports for loading Pt nanoparticles, and the supported catalysts (viz., Pt/CeO2, Pt/ZrO2, and Pt/Fe2O3) were evaluated for the catalytic deoxygenation of stearic acid to produce olefins by analytical pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Interestingly, Pt/CeO2 and Pt/Fe2O3 catalysts demonstrated high selectivity for olefins or aromatics, respectively, with alkanes as minor products, while the Pt/ZrO2 catalyst demonstrated the lowest deoxygenation efficiency. Among them, the Pt/CeO2 catalyst demonstrated the highest deoxygenation efficiency due to its highest oxygen vacancy density and the largest specific surface area (53 m2 g−1). It also demonstrated the highest selectivity for olefins (41%) due to the in situ partial formation of the bimetallic PtCe phase during the catalytic reaction at high temperature, which facilitates the decarbonylation pathway and leads to the formation of olefins as the main product. In addition, experimental optimizations of the reaction parameters were conducted on the designed Pt/CeO2 catalyst to further enhance olefin selectivity. Importantly, the Pt/CeO2 catalyst also maintained high olefin selectivity and stearic acid conversion even after six consecutive cycles. Therefore, this work has provided an alternative route to produce olefins via the decarbonylation of stearic acid over a supported Pt/CeO2 catalyst.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Lijing Yang,Junhong Ma,Yuemei Liu,Chaoyun Ma,Xue Yu,Ziyang Meng
Preparing high-performance catalysts for oxygen reduction reaction (ORR) with low Pt loading is crucial to promote the development of clean energy storage devices such as metal air batteries. Herein, Co/ N -HCMs support material with isolated Co atoms and hollow flower-like structure could be prepared by a self-sacrificing template strategy. Co/ N -HCMs are then used to anchor Pt to obtain PtCo/ N -HCMs catalyst with low Pt loading. Thanks to its improved specific surface area, hierarchical porous structure, and reinforced metal-support interactions, the obtained PtCo/ N -HCMs deliver high onset potential of 0.99 V and half-wave potential of 0.82 V, and an excellent durability. When used as air cathode catalyst, PtCo/ N -HCMs-based Zinc-air battery (ZAB) exhibits a power density of up to 202 mW cm −2 , which is significantly better than ZAB assembled with commercial Pt/C. This study provides an effective strategy for preparing high-performance electrocatalysts with low precious metal content for use as the cathode of metal-air batteries.
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Catalysis Science & Technology
·
2024
·Vol. 14
·期 14
·4058-4067
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IF 4.4
Yang You,Aijie Xu,Yao Lv,Lide Yang,Xuan Tang,Jie Tang,Yanglong Guo,Yao Cui,Wangcheng Zhan,Li Wang,Yun Guo,Sheng Dai
Complete oxidation of propane has drawn great attention in the fields of automotive emission control and volatile organic compound elimination. However, it is challenging to achieve high activity of this reaction due to the stability of propane. We here utilize a facile solvothermal method to construct tri-coordinated Al (AlIII) sites on the as-synthesized ST-Al2O3 support to alter the properties of supported Pt species. It is demonstrated that AlIII sites facilitate the dispersion and electron enrichment of supported Pt sites. Thus, Pt/ST-Al2O3 exhibits a superior activity toward complete propane oxidation, showing a 6.7-fold improvement in the turnover frequency over commercial Pt/Al2O3 catalysts. Meanwhile, Pt/ST-Al2O3 possesses a distinct reaction route originating from its stronger C–H and C–C cleavage capability, while having excellent activity not only in complete propane oxidation but also in the complete oxidation of other alkanes (CH4, C2H6, and n-C4H10). In addition, the AlIII construction strategy is successfully extended to more cases, e.g., Pd/ST-Al2O3 with higher Pd dispersion and electron density. This work provides a promising strategy for the control of the oxide support for advanced design and synthesis of alkane oxidation catalysts.
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