INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
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IF 3.205
Yuan-Hang Qin,Zi-Yao Xiong,Jiayu Ma,Li Yang,Zaikun Wu,Weiliang Feng,Tie-Lin Wang,Wei-Guo Wang,Cun-Wen Wang
TiO 2 -modified nitrogen-doped carbon (TiO 2 -NC), prepared by a polymerization-pyrolysis process, is used to support the Pd catalyst for ethanol oxidation reaction (EOR) in alkaline media . X-ray photoelectron spectroscopy characterization indicates that the incorporation of TiO 2 and nitrogen into the carbon matrix could improve the percentage of Pd 0 in Pd/TiO 2 -NC catalyst. Electrochemical characterization shows that the Pd/TiO 2 -NC catalyst presents higher electrocatalytic activity and stability for EOR than the nitrogen-doped carbon-supported Pd (Pd/NC) catalyst and the carbon black-supported Pd (Pd/CB) catalyst, which can be mainly attributed to the high percentage of Pd 0 in Pd/TiO 2 -NC catalyst (65%) than those in Pd/NC (48%) and Pd/CB (31%) catalysts. The results indicate that the Pd/TiO 2 -NC catalyst holds great potential as high-performance anode catalyst for direct ethanol fuel cells.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Yu Long,Yansheng Liu,Ziming Zhao,Sha Luo,Wei Wu,Li Wu,He Wen,Ren-Qi Wang,Jiantai Ma
Pd-nitrogen-doped-carbon nanocatalysts (Pd-C/N) with different morphologies, such as porous spheres, yolk-shell and hollow structures, had been synthesized and compared. The yolk-shell Pd-nitrogen-doped-carbon nanocatalysts (YS-Pd-C/N) and hollow Pd-nitrogen-doped-carbon nanocatalysts (H-Pd-C/N) were prepared through different etch time using SiO 2 spheres as hard-templates. The as-prepared catalysts were characterized thoroughly by TEM , BET, XRD , FT-IR, and XPS . Importantly, the catalysts have moderate BET specific surface area in the range from 200 to 300 m 2 g −1 and pore volume between 0.2 and 0.3 cm 3 g −1 . The reduction of 4-nitrophenol is chosen as a model reaction to research the morphology effects of these prepared Pd-C/N catalysts with the same chemical compositions . Interestingly, H-Pd-C/N exhibited the best catalytic performance, which could be attributed to its high nitrogen content, the uniform distribution of abundant active sites, as well as the synergistic effect of graphitic C/N shell and Pd species for the catalytic reaction . Especially, the unique hollow morphology and porous shell of H-Pd-C/N made it to be a nanoreactor , which was beneficial to improve the catalytic activities. In addition, H-Pd-C/N nanocatalysts exhibited favorable stability in the recycling reactions.
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RSC Advances
·
2017
·Vol. 7
·期 6
·3443-3449
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IF 3.108
Ying Duan,Min Zheng,Dongmi Li,Dongsheng Deng,Cuicui Wu,Yanliang Yang
The Pd/SBA-15 catalyst was synthesised through the reduction of PdCl2 by the surface-bonded vinyl group on vinyl-functionalized SBA-15, which was prepared via co-polymerization. XRD and XPS characterization confirmed the successful reduction of Pd(II) to Pd(0). Pd/SBA-15 showed a narrow palladium particle-size distribution of about 5–6 nm in the TEM image. The Pd/SBA-15 catalyst was effective for the hydrogenation of aromatic nitro compounds with zero-order kinetics, and the TOF for the hydrogenation of nitrobenzene was 1124 h−1 at 313 K and 1 atm H2. A steric effect was observed for the substituted nitroarenes.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Shu-He Han,Juan Bai,Hui-Min Liu,Jing-Hui Zeng,Jia-Xing Jiang,Yu Chen,Jong-Min Lee
Noble metal nanostructures (NMNSs) play a crucial role in many heterogeneous catalytic reactions. Hollow and porous NMNSs possess generally prominent advantages over their solid counterparts due to their unordinary structural features. In this work, we describe a facial one-pot synthesis of hollow and porous Pd–Cu alloy nanospheres (Pd–Cu HPANSs) through a polyethylenimine (PEI)-assisted oxidation–dissolution mechanism. The strong coordination interaction between CuII and PEI facilitates the oxidation–dissolution of the Cu2O nanospheres template under air conditions, which is responsible for the generation of the Pd–Cu alloy and the convenient removal of the Cu2O nanospheres template at room temperature. Compared to the commercial Pd black, the Pd–Cu HPANSs show remarkably improved catalytic activity for the reduction of K2Cr2O7 by HCOOH at room temperature, attributing to the enhanced catalytic activity of the Pd–Cu HPANSs for the dehydrogenation decomposition of HCOOH.
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Journal of Materials Chemistry C
·
2024
·Vol. 13
·期 1
·295-305
·
IF 5.7
Yanan Gao,Jingjing Wang,Jingxuan Yang,Yajie Wang,Wenjuan Tian,Bin Liu
Nitrogen-rich graphitic carbon nitride (g-C3N5) has garnered significant attention in photocatalytic hydrogen production due to its unique physicochemical properties. However, g-C3N5 faces persistent challenges stemming from rapid carrier recombination. In this study, we successfully synthesized a Pd/C3N5-K,I photocatalyst through sequential doping of non-metallic heteroatoms and metal nanoparticles. The Pd/C3N5-K,I photocatalyst demonstrates a remarkable enhancement in the photocatalytic H2 evolution rate (2.9 mmol g−1 h−1), approximately 14 times higher than that of pure g-C3N5 (0.2 mmol g−1 h−1). Characterization and calculation analyses reveal that iodine doping into the g-C3N5 skeleton leads to the formation of planar C–I bonds, facilitating C3N5 layer electron–hole pair separation. The subsequent insertion of Pd nanoparticles between the layers leads to electron accumulation on C3N5-K,I, while resulting in hole concentration on Pd nanoparticles, thereby facilitating thorough spatial separation of electron–hole pairs. The strategic co-doping of iodine and palladium nanoparticles effectively restrains carrier recombination of g-C3N5 by connecting intra- and inter-layer interactions. This study constitutes a novel conceptual framework for CN-based photocatalysts, offering a promising approach to improve their performance in hydrogen production applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Yunfei Xu,Ying Li,Yongjian Wei,Haiou Liang,Tong Xu,Yinghui Sun,Jie Bai
Photothermal synergistic catalysis of Suzuki-Miyaura coupling reaction not only utilizes the solar energy efficiently, but also reduces the energy consumption. It is a green organic synthesis method for constructing C–C bonds, which has a wide application. In this work, we constructed a PdO/g-C 3 N 4 /TiO 2 bilayer tubular structure material with a heterojunction structure by a simple and effective method. The catalyst exhibited efficient photothermal synergistic catalytic performance in Suzuki coupling reaction under visible light irradiation. The influence of the catalyst’s structure, morphology, composition, and photothermal response on the Suzuki coupling reaction were discussed based on a series of characterizations and activity test of the catalyst. The results showed that the PdO/g-C 3 N 4 /TiO 2 catalyst contained an effective g-C 3 N 4 /TiO 2 heterojunction structure. Under visible illumination, the differences in interfacial charge concentration and electron affinity between these two different types of semiconductors lead to charge rearrangement and transfer, which greatly improves the carrier separation efficiency. Meanwhile, palladium metal exhibits excellent electron deposition effects, both as an active metal center for SMC reactions and as an electron acceptor for facilitating photoelectron transfer. Electron-rich palladium atoms play an important role in C–C bond formation reactions, improving catalytic efficiency. The PdO/g-C 3 N 4 /TiO 2 catalyst has excellent catalytic activity and can catalyze the SMC reaction under visible light and at 0 ℃, the yield reached 85.6%, which is comparable to the activity of thermal catalysis for 15 minutes. Furthermore, after five cycles, the PdO/g-C 3 N 4 /TiO 2 catalyst still maintained an 83.1% yield, demonstrating excellent cycle stability. This article offers an effective strategy for preparing heterojunction catalyst with visible light response for photothermal reaction and presents the potential of these catalysts as a way to improve the efficiency and sustainability of Suzuki coupling reactions.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
·
IF 20.2
Kai Deng,Zilong Lian,Wenxin Wang,Jiabao Yu,Qiqi Mao,Hongjie Yu,Ziqiang Wang,Liang Wang,Hongjing Wang
Despite the fruitful achievements in the development of high-performance catalysts, most of materials still suffer limited HER kinetics and poor durability in harsh acidic media, especially at high current densities . In this work, a Pd nanoparticles/Ir metallene heterojunction structure (Pd/Ir hetero-metallene) were successfully prepared by a facile co-reduction method. The hydrogen spillover bridging H + adsorption/H 2 desorption process occurring at the Pd/Ir interface results in the rate-determining step change to a Tafel step, which accelerates the HER kinetics. The Pd/Ir hetero-metallene has a relatively low Δ G Hads (-0.19 eV), which allows for rapid adsorption of H + and release of H 2 , thus greatly improving the performance of HER. As a result, the Pd/Ir hetero-metallene exhibits remarkable HER performance with ultra-low overpotentials of only 69 and 133 mV to reach 500 and 1000 mA cm −2 , a small Tafel slope of 21 mV dec −1 , and superb stability.
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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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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Tianhang Liu,Kaisheng Yao,Hang Li,Qi Wang,Tianhang Han,Aozhou Wang,Haili Zhao,Weiwei Lu
Developing a simple, environmentally friendly, and mild method to one-step prepare bimetallic nanoframes is pretty important but still technically challenging. In this paper, a simple and easy-to-operate ionic liquid (IL)-regulated protocol is proposed to fabricate Au–Pd superbranched trigonal nanoframes (STNFs) in water at room temperature. In the aqueous solution containing precursors (Na2PdCl4 and HAuCl4) and a reducing agent (ascorbic acid), a common IL 1-octyl-3-methylimidazolium chloride ([C8mim]Cl) was used to guide the anisotropic growth and construction of Au–Pd STNFs, brightly showing green and energy-saving characteristics. Au–Pd STNFs take shape as unique two-dimensional (2D) trigonal frameworks containing multilevel orderly branches. It is found that [C8mim]Cl is crucial to the formation of Au–Pd STNFs. Owing to the unique structures, high specific surface areas, large freestanding sizes, and probably electronic effects between Au and Pd, Au–Pd STNFs-1 exhibit dramatically enhanced catalytic activity, selectivity, durability, and convenience for recycling in the 4-nitrostyrene hydrogenation reaction. Specifically, 4-nitrostyrene can be converted completely only within 5.0 min at 25 °C under atmospheric pressure, and the selectivity toward 4-nitroethylbenzene is as high as 100% and maintains good performance after five cycles. It is expected that well-constructed Au–Pd STNFs also display advanced potential in other applications.
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ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Yujun Cheng,Jianping Guan,Zhipeng Zhang,Ruili Li,Yao Yao,Xiaotong Sun,Qi Liu,Xiaoqing Chen
Constructing materials that possess both catalytic properties and surface plasmonic active structures presents an essential requirement in the field of in situ surface-enhanced Raman spectroscopy (SERS) monitoring. In this work, we developed a novel black raspberry-like bifunctional nanoreactor platform (HPRS@Au–Pd) with enhanced surface-enhanced Raman spectroscopy (SERS) activity (EF = 3.11 × 109) and excellent catalytic performance (e.g., |K| = 1.72 × 10–2 s–1 for 4-BTP). This platform enables sensitive and real-time monitoring of Suzuki reactions, providing an efficient and stable system for mechanistic investigations. By fitting a first-order kinetic model, we quantitatively analyzed the reaction kinetics of haloarenes on Pd NPs, revealing the direct involvement of surface-bound Pd NPs in the catalytic process. Furthermore, 4MPBA-blocking experiments using haloarenes devoid of functional groups demonstrated the absence of catalytic activity from dissolved Pd species, conclusively supporting the heterogeneous nature of the reaction. This work extends the applicability of the conclusion regarding heterogeneous catalysis to a broader range of substrates, offering valuable insights into the design and optimization of dual-functional nanoreactors. Beyond the Suzuki reactions, the versatility of this platform opens avenues for applications in other catalytic reactions, showcasing its potential in advanced catalytic studies and real-time monitoring.
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Marine Drugs
·
2024
·Vol. 22
·期 5
·193
·
IF 4.9
Baoxiang Wang,Lihua Geng,Jing Wang,Yuxi Wei,Changhui Yan,Ning Wu,Yang Yue,Quanbin Zhang
Parkinson’s disease (PD) is a prevalent neurodegenerative disorder, and accumulating evidence suggests a link between dysbiosis of the gut microbiota and the onset and progression of PD. In our previous investigations, we discovered that intraperitoneal administration of glucuronomannan oligosaccharides (GMn) derived fromSaccharina japonicaexhibited neuroprotective effects in a 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced PD mouse model. However, the complicated preparation process, difficulties in isolation, and remarkably low yield have constrained further exploration of GMn. In this study, we optimized the degradation conditions in the preparation process of GMn through orthogonal experiments. Subsequently, an MPTP-induced PD model was established, followed by oral administration of GMn. Through a stepwise optimization, we successfully increased the yield of GMn, separated from crude fucoidan, from 1~2/10,000 to 4~8/1000 and indicated the effects on the amelioration of MPTP-induced motor deficits, preservation of dopamine neurons, and elevation in striatal neurotransmitter levels. Importantly, GMn mitigated gut microbiota dysbiosis induced by MPTP in mice. In particular, GM2 significantly reduced the levels ofAkkermansia, Verrucomicrobiota, andLactobacillus, while promoting the abundance ofRoseburiaandPrevotellacompared to the model group. These findings suggest that GM2 can potentially suppress PD by modulating the gut microbiota, providing a foundation for the development of a novel and effective anti-PD marine drug.
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Materials Today Bio
·
2025
·
IF 10.2
Liangyin Wei,Hong Wang,Xietao Ye,Junfan Yue,Hong Guo,Dengxuan Mao,Xia Li,Yeyang Sun,Congyan Liu,Yuping Liu,Yan Chen
The response rate of programmed cell death protein-1 (PD-1) inhibitors in breast cancer remains unsatisfactory, primarily due to the limited infiltration and activity of tumor-infiltrating T lymphocytes (TILs). Previous studies demonstrated that oxymatrine (Om) and astragaloside IV (As) could enhance TIL infiltration and function by inhibiting cancer-associated fibroblasts (CAFs) and promoting mitochondrial activity in TILs, respectively. Thus, combining Om and As may be a promising strategy to improve the antitumor effects of PD-1 inhibitors in breast cancer. However, co-delivery above drugs into breast cancer tissue is challenging due to their low bioavailability and distinct physicochemical properties. This study addresses this challenge by formulating Om and As co-loaded liposomes (Om-As-Lip) and comparing the scale-up production methods: high-pressure homogenization (EP-HPH) and microfluidics. Om-As-Lip prepared via microfluidics demonstrated superior entrapment efficiency (As: 99.03 ± 0.04%, Om: 67.01 ± 0.02%) and a significantly higher production rate (22.12 mL/min) compared to EP-HPH (1.19 mL/min). Additionally, Om-As-Lip produced by microfluidics increased the area under the curve (AUC) (Om: 6.17-fold, As: 2.07-fold) and maximum concentration (Cmax) (Om: 1.58-fold, As: 3.49-fold) compared to the free drugs. Importantly, Om-As-Lip enhanced the antitumor efficacy of α-PD-1 by inhibiting CAF activation and boosting TIL activity, resulting in a tumor inhibition rate of 61.2% and extended survival in mice. This work presents a novel perspective for scaling up co-delivered formulations of drugs with differing polarities to improve breast cancer immunotherapy.
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