Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 4
·1623-1628
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IF 8.867
Binbin Jiang,Yuyang Sun,Fan Liao,Wen Shen,Haiping Lin,Hui Wang,Mingwang Shao
Hydrogen production with the aid of electrocatalysis is a critical component for several developing clean-energy technologies. Such a renewable energy depends heavily on the choice of cheap and efficient catalysts for hydrogen evolution, which has still been a challenge until now. In this work, the theoretical calculation indicates that Rh–Ag–Si ternary catalysts exhibit more active hydrogen evolution performance than Pt–Ag–Si because the migration activation energies of H atoms from Rh(111) to Si are lower than those from Pt(111) to Si via the Ag surface. This simulation was confirmed by the experimental results: Rh–Ag/SiNW (or Pt–Ag/SiNW) catalysts were prepared by directly reducing Rh (or Pt) and Ag ions with Si–H bonds. The Rh–Ag/SiNW-2 with the optimal mass ratio of 2.3 : 23.4 : 74.3 (Rh : Ag : Si) exhibited a lower Tafel slope (51 mV dec−1) and a larger exchange current density (87.1 × 10−6 A cm−2) than the Pt–Ag/SiNW. In addition, the mass activity of Rh–Ag/SiNW-2 at an overpotential of 0.2 V (11.5 mA μgRh−1) is 12.0, 5.0 and 3.3 fold higher than that of Rh–Ag (0.96 mA μgRh−1), Pt–Ag/SiNW (2.3 mA μgPt−1) and 40 wt% Pt/C (3.5 mA μgPt−1) catalysts, respectively. Moreover, the Rh–Ag/SiNW nanocatalysts had good stability in acidic media. The results presented herein may offer a novel and effective methodology for the designing of cost-efficient and environmentally friendly catalysts for electrochemical fields.
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Advances in Natural Sciences-Nanoscience and Nanotechnology
·
2024
·Vol. 15
·期 1
·015008
·
IF 1.7
Tai Thien Huynh,Quyen Huynh,Ngoc-Han T Huynh,Hau Quoc Pham
In this work, we prepared an Ir,N-doped TiO2 nanomaterial via a facile HNO3-assisted hydrothermal process that was used as an advanced support for nano-sized Pt nanoparticles (NPs) for the formic acid oxidation reaction (FAOR). The physical and electrochemical behaviours of the as-made Pt/Ir,N-doped TiO2 catalyst were systemically investigated through X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), field emission scanning electron microscopes coupled with energy dispersive X-ray analysis (FE-SEM/EDX mapping), transmission electron microscopy (TEM), linear sweep voltammetry (LSV), Tafel slope, CO-stripping, and chronoamperometric (CA) test. The Pt NPs (ca. 3 nm) were anchored on the Ir,N-doped TiO2 support, being formed by a mixture of rutile and brookite with a particle size of several ten nanometers. Due to the small size and uniform distribution of Pt NPs, the Pt/Ir,N-doped TiO2 catalyst had an electrochemical surface area of 79.88 m2 g−1, which was greater than that of the commercial Pt/C (77.63 m2 g−1). In terms of the FAOR, the Pt/Ir,N-doped TiO2 catalyst showed a negative FAOR onset potential, high current density (11.85 mA cm−2), and superior CO-tolerance compared to the commercially available catalyst. Also, the as-made catalyst possessed high electrochemical durability after 3600 s for testing. The enhanced FAOR efficiency was assigned to the formation of a dual-doping effect and strong interplay between Pt and TiO2-based support, which not only improved the electron transfer but also weakened the adsorption of carbonaceous species, thereby boosting the reaction kinetics. This study could open up a facile but effective strategy to promote particular electrochemical applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Gang Chen,Ruonan Tian,Qiaolin Li,Tiantian Cao,Huai Tan,Hongtao Guan,Chengjun Dong,Elisabetta Comini
Design sensing materials with core-shell structure is an excellent strategy to achieve high sensing performance toward acetone detection. Herein, MIL-88A(Fe) was fabricated via a hydrothermal route, which renders as a template to fabricate Fe 2 O 3 @In 2 O 3 core-shell spindles structure. Gas sensing results show that the sensor based on Fe 2 O 3 @In 2 O 3 exhibit enhanced response of 193–200 ppm acetone than that of 36 for pristine Fe 2 O 3 at 200 °C. After Pt functionalization, the response of Fe 2 O 3 @In 2 O 3 /Pt to 200 ppm acetone is up to 839 at a reducing working temperature of 180 °C with a good selectivity and long-term stability. A synergistic mechanism originated from the intrinsic merits of Fe 2 O 3 and In 2 O 3 , the 1D core-shell structure, the creation of heterojunction at the interface of Fe 2 O 3 and In 2 O 3 and the creation of Shottky junction at In 2 O 3 and Pt nanoparticles, and the catalytic reaction of Pt holds accountable for the significant improvement in acetone sensing.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Juan Du,Tianfeng Cai,Qiao Han,Hongda Wu,Qing Zhao,Lufan Zheng,Shuo Liu,Zhanxu Yang
The hydrogen spillover is considered a powerful strategy for improving the kinetics of hydrogen evolution reaction (HER) due to the decoupling of hydrogen adsorption and desorption. However, the hydrogen spillover rate strongly depends on the metal-support interfaces, and the Fermi levels (E f ) difference between metal and support hinders the occurrence of hydrogen spillover. Here, we prepared platinum (Pt) doped on molybdenum disulfide (MoS 2 ) with sulfur vacancies (Sv) catalyst (Pt/Sv-MoS 2 ) and investigated the internal relationship between metal-support interfaces and hydrogen spillover mechanism. The experimental and theoretical results show that sulfur (S) vacancies reduce the work function (ΔΦ) at the metal-support interface, thus accelerating the migration rate of hydrogen from Pt to Sv-MoS 2 . Meanwhile, the introduction of S vacancies promotes the high dispersion of Pt nanoparticles (Pt NPs) and weakens the electron supply from Pt to MoS 2 , facilitating active hydrogen (*H) adsorption step and thus increasing the hydrogen coverage on the Pt sites. Consequently, the prepared Pt/Sv-MoS 2 catalyst exhibited significantly enhanced HER activity, achieving an overpotential of 26 mV at 10 mA·cm −2 and a Tafel slope of only 28 mV·dec −1 , which is superior to commercial 20 % Pt/C.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
·
IF 4.1
Yang Li,Hairun Ma,Wenyu Xie,Jiahao Liang,Min Li,Shaohui Guo,Guangxu Yan
The short service life and low catalytic activity of electrodes are the major bottlenecks limiting the practical applications of current electrocatalytic oxidation technology in wastewater treatment. In this study, a novel Ti/SnO 2 -Sb-Nd-Pt electrode loading TiO 2 nanotube (TiO 2 -NTs) array was proposed and prepared. The optimized TiO 2 nanotube (TiO 2 -NTs) arrays provided abundant anchoring sites for SnO 2 -Sb-Nd-Pt active coating and improved the bonding strength between the Ti matrix and the SnO 2 -Sb-Nd-Pt active coating as a mediator, as a result, higher electrocatalytic performance and stability. The nitrobenzene (NB) removal and service life were significantly higher in Ti/TiO 2 -NTs/SnO 2 -Sb-Nd-Pt (91.08 % and 4381.9 days) when compared to Ti/SnO 2 -Sb-Nd-Pt (80.61 % and 1151.2 days). In addition, the outstanding electrocatalytic performance of Ti/TiO 2 -NTs/SnO 2 -Sb-Nd-Pt with an oxygen evolution potential of 2.03 V and total voltametric charge of 5.88 mC cm −2 makes it a promising candidate for future industrial applications. These findings will lay a solid foundation for broadening the applications of well-defined TiO 2 -NTs arrays prepared via the two-step anodization.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-9
·
IF 15.7
Li Yan,Lu Lijun,Jiang Xueyu,Yang Dali,Chen Jeng-Lung,Dutta Chowdhury Abhishek,Li Wu,Pei Xianglin,Lei Aiwen
Biomass valorization is a way to promote the ‘waste-to-wealth’ concept, which is a pre-requisite condition for a future sustainable lifestyle. The direct utilization of natural polymer for value-added materials should be prioritized. With this object, we demonstrate a facile and economical method to prepare chitin-derived supramolecular nanowires-stabilized single-atom sites Pt catalysts (SS-Pt-CSNs). A comprehensive characterization shows the structure of single-atom Pt coordinated with the organic supramolecular (ligand-type) entity, which is both flexible (like in homogenous catalyst) and robust (like in heterogenous catalyst). Such hybrid characteristics of these SS-Pt-CSNs materials exhibit excellent catalytic performance for chemo-selective hydrogenation of various unsaturated bonds with a selectivity of more than 90:1 and a high turnover number (TON) of 121,350. Mechanistic studies demonstrate that both empty coordination sites of Pt and dynamic B-doping are the key factors for exceptional efficiency and high selectivity.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Xiushuang Zhou,Yu Shen,Xubo Li,Yongmin Huang
Hydroxylammonium nitrate (HAN)-based propellants represent next-generation monopropellants for thrusters. Ruthenium is a promising catalytic material for HAN-based propellants, with the merits of high activity and relatively low price. However, ruthenium catalyst is unstable and prone to aggregation and oxidation. Herein, we prepared a Ru–Pt alloy nanoparticle (NP) catalyst via an impregnation method. The addition of Pt effectively delayed the deactivation of Ru. In order to understand the active components of the catalyst, both fresh and aged catalyst samples were characterized. The active species was identified as Ru0 species, which was gradually oxidized to Ru/RuOx. In droplet and thruster tests, the Ru–Pt alloy NP catalyst exhibited a higher activity and stability than the Ru NP catalyst and successfully passed through the pulse and 100-second-long steady-state thruster tests, with good pulse consistency and low steady-state roughness. This work provides a promising pathway to explore low-cost catalysts for HAN decomposition.
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ACS Catalysis
·
2025
·
IF 13.1
Yuyao Yang,Xuan Bie,Xiaoying Qi,Yongqing Xu,Qinghai Li,Yanguo Zhang,Hui Zhou
Aqueous phase reforming of methanol (APRM) offers a method for releasing H2 from the liquid phase, by which H2 can be stored in methanol safely. It is an efficient way to design high-performance catalysts by controlling the hydroxyl (OH) groups, but its mechanism for affecting the APRM is still unclear. Herein, we loaded Pt on three types of Al2O3 (nanopolyhedron, nanosheet, and nanorod Al2O3) with different OH contents and types. Among them, Pt/nanorod Al2O3 exhibited the highest H2 production rate of 20.4 μmol g–1 s–1 with 96.6% H2 selectivity at a low temperature of 190 °C. This was attributed to the roles of hydroxyl groups in modulating Pt states. On nanopolyhedron, nanosheet, and nanorod Al2O3, the bonding of Pt with O atoms became more favorable as the dehydroxylation happened. In particular, on nanorod Al2O3, the dehydroxylation process generated a high density of five-coordinated Al (AlV) sites, facilitating the dispersion and anchoring of Pt particles. Moreover, the special OH groups (hydrogen bond donor) on nanorod Al2O3 promoted Pt particle reduction via the movement of electrons. Ultimately, the results demonstrated the influence of OH groups on the dispersion and reduction of active metals, offering perspectives for designing catalysts for APRM through hydroxyl control.
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ACS Biomaterials Science & Engineering
·
2024
·
IF 5.4
Chang Liu,Zhengjiang Cao,Li Li,Qingyin Li,Chunle Zhang,Yunbing Wang,Linhua Li,Ping Fu
Sepsis is a severe and complex systemic infection that can result in multiple organ dysfunction. Sepsis-associated acute kidney injury (SAKI), caused by inflammatory response, oxidative stress, and cellular apoptosis, is a common complication that seriously impacts patient survival rates. Herein, a potent and novel metal-polyphenol nanomicelle can be efficiently self-assembled with Pt4+ and honokiol (HK) by the chelation, π–π conjugation, hydrophobic action, and the surfactant properties of Tween-80. These nanomicelles not only enhance drug bioavailability (encapsulation rates: Pt─49%, HK─70%) and reduce drug toxicity (safety dose: <20 μg/g) but also improve targeting toward damaged renal tissues. Furthermore, Pt4+ and HK in the nanomicelles exert a synergistic physiological effect by scavenging free radicals to alleviate oxidative damage, inhibiting macrophage activation and the release of inflammatory factors to regulate inflammation, and displaying broad-spectrum antimicrobial activity to control infection. These actions collectively protect renal tissue and restore its functionality. Here, we constructed metal-polyphenol nanomicelles (Pt/HK-NMs) via ingenious and efficient self-assembly, providing a new strategy to compensate for deficiencies in the hemodialysis and antibiotic treatment of SAKI.
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Molecular Catalysis
·
2024
·
IF 3.9
Yi He,Peng Bai,Shibo Yuan,Jiafa Chen,Yicheng Zhao,Yongdan Li
N -formylation of amines with CO 2 is a promising approach to high-efficient utilization of CO 2 as C1 feedstock, while conventional thermocatalytic processes suffer from harsh reaction condition and intense energy consumption. In this work, photocatalytic N -formylation of amines with CO 2 is achieved at room temperature over Pt-Bi/CeO 2− x composite catalyst. The Pt-Bi bimetallic sites increase the concentration of surface oxygen vacancies. Furthermore, the synergistic effects of Pt and Bi improve the light absorption capacity, reduce the band gap energy of the photocatalyst and promote the separation of photoinduced charge carriers. Using PhSiH 3 as the reducing agent, the conversion of N -methylaniline reaches 100 % after 3 h irradiation in N, N -dimethylformamide solvent with a N- methylformanilide selectivity of 90.8 %. The composite photocatalyst shows promising cycling stability and universality.
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Sustainable Materials and Technologies
·
2025
·
IF 9.2
Dong Wang,Hongyu Zhang,Ping Yang,Xiao Zhang
A novel approach is developed to construct Z -scheme heterojunctions via growing SnO 2 nanoparticles on Pt decorated hollow TiO 2 bowl nanoarrays (TBN) towards efficient photogenerated charge carrier separation and transfer to enhance the redox ability of resulting catalysts. Namely, sample TBN was fabricated using hollow carbon spheres as templates, in which highly crystalline TiO 2 nanoparticles (less than 10 nm) were assembled into nanoarray to construct hollow bowl spheres. Homogeneously distributed small Pt nanoparticles in TBN govern the growth of SnO 2 nanoparticles via a solvent thermal route and finally to create Z -scheme TiO 2 /Pt/SnO 2 heterojunctions. Pt loading between SnO 2 and TBN components improved photogenerated charge carrier separation and transfer efficiencies and enhanced photocatalytic performance. TiO 2 /Pt/SnO 2 heterostructure samples exhibited improved performance for tetracycline hydrochloride removal with a pseudo-first-order kinetic reaction constant of k = 0.080 min −1 which were 3.8 and 6.7 times of those of TBN (k = 0.012 min −1 ) and TBN/SnO 2 composites (sample TS, k = 0.021 min −1 ), respectively. Moreover, the photocatalytic hydrogen generation rate of TiO 2 /Pt/SnO 2 heterostructures without using co-catalyst was 3511.9 μmol·g −1 ·h −1 which was 2.3 times of that of sample TS using Pt as co-catalyst. These results provided new sights for synthesis of photocatalysts especially for the removal of antibiotic pollutants.
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CATALYSIS SURVEYS FROM ASIA
·
2025
·
IF 2.3
Zhu Mengxuan,Li Hongqing,Wang Xin,Wang Longyang,Wang Rui,Jiang Heng,Jin Changzi
Design of efficient metal-acid bifunction catalysts is of significance for development of hydroisomerization of linear alkanes. In this study, the spatial configurational construction of Pt-ZSM-5 catalytic system was achieved by fabrication of acidic ZSM-5 zeolite and mesoporous silica core-shell composites equipped with controlled location of Pt sites, which aim to explore the effect of functional sites proximity on isomerization reactivity. A series of characterization techniques such as X-ray diffraction, transmission electronic microscopy, N 2 physical adsorption, NH 3 temperature programmed desorption, X-ray photoelectron spectroscopy and so on had confirmed that the synthesized core-shell bifunctional catalysts with different Pt location possessing similar textural, acid and metal properties. In the catalytic hydroisomerization of n -heptane, however, the catalyst with Pt sites locating at acid zeolite exhibits superior n -heptane conversion and isomerization selectivity, which indicates that proximity of active sites at atomic scale may be more conducive to their synergistic effect when the diffusional limitation from zeolitic channel is minimized. These results had presented new direction for the preparation of efficient bifunctional catalysts in hydroisomerization of linear alkanes.
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