Journal of Environmental Sciences
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2025
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IF 6.3
Rongrong Hong,Yunshuo Wu,Yuetan Su,Chu Qin,Haiqiang Wang,Xuanhao Wu,Zhongbiao Wu,Xiaole Weng
Highly efficient catalysts for methane combustion have long been pursued due to the intrinsic inertness of CH 4 . In this work, bimetallic PtIr/TiO 2 catalysts with varying Pt:Ir ratios were synthesized to modulate the electronic structures of the metals, thereby achieving bimetallic synergy to enhance CH 4 combustion activity. Among the series of monometallic and bimetallic catalysts, Pt 0.5 Ir 0.5 /TiO 2 exhibited the highest activity, achieving complete CH 4 conversion (T 100 ) at 370°C after activation during the first reaction cycle. Combined experimental and computational studies elucidated that the incorporation of Ir facilitated electron transfer and the formation of partially oxidized Pt δ+ (0 < δ < 2) species, which were coordinatively unsaturated and more conducive for CH 4 oxidation. The high affinity of Ir for oxygen enabled the Pt δ+ species to be stabilized under CH 4 oxidation reaction conditions, instead of being overoxidized into Pt 2+ species as in the monometallic Pt 1 /TiO 2 catalyst. Simultaneously, Ir species in the bimetallic catalyst were oxidized into Ir δ+ species during the reaction and ultimately formed the Pt δ+ -O-Ir δ+ interface to further elevate the reaction activity. Moreover, the bimetallic catalysts integrated the merits of Ir for CH 4 adsorption and Pt for intermediates conversion, synergistically boosting the reaction activity. This work provides insight into designing effective CH 4 combustion catalysts through fine-tuning the metal electronic structures.
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Materials Today Chemistry
·
2025
·
IF 6.7
Chen Shen,Haiyong Wang,Tianyu Ren,Tianhan Zhu,Tianyu Gao,Mi Luo,Xiaoman Wang,Tong Zhang,Chenguang Wang
The cascade amination of nitrobenzene with benzaldehyde represents an environmentally benign route for imine synthesis in fine chemistry. Nevertheless, challenges including harsh reaction conditions, inefficiency, and poor selectivity hinder its practical implementation. Herein, we report a Pt/Zn x Fe 3-x O y interfacial catalyst system that synergistically modulates both electronic states of Pt nanoparticles (NPs) and acid/base properties of the support to address these limitations. Controlling of chemical composition of Zn x Fe 3-x O y to can efficient regulate electronic state of Pt and acid/base sites of Pt/Zn x Fe 3-x O y . The catalytic performance was strongly dependent on the interfacial electronic interactions and acid-base properties at the Pt/Zn x Fe 3-x O 4 interface. Due to lower work function of ZnFe 2 O 4 , interfacial electrons transfer to Pt from ZnFe 2 O 4 support form rich-electronic Pt accelerated hydrogenation of nitrobenzene. Rich oxygen vacancies and hydroxyl groups as acid and base sites, optimize condensation efficiency and intermediate desorption. This dual regulation strategy achieves exceptional catalytic performance under mild conditions (30 °C, 1 MPa H 2 , 4 h), delivering 96.0 % conversion with 96.25 % imine selectivity. More than 20 different amines compounds and gram-scale of imines (1.495 g) were synthesized over Pt/ZnFe 2 O 4 . In-situ DRIFTS spectroscopy identifies aniline as the critical intermediate, confirming the proposed cascade mechanism. Our work establishes a materials design paradigm leveraging support composition to reconcile electronic and acid-base requirements in tandem catalysis.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yirui Jiang,Jianfang Liu,Hongru Liu,Yong Wang,Yongzhi Zhao,Sijia Liu,Yunpu Qin,Zihao Li,Hong Zhao,Hao Li,Haoyang Wu,Deyin Zhang,Luan Liu,Baorui Jia,Xuanhui Qu,Mingli Qin
Platinum (Pt) metal is widely acknowledged as a highly efficient electrocatalyst for hydrogen evolution reaction (HER) in acidic electrolyte. However, its performance in alkaline environments is significantly lower owing to the sluggish water dissociation step. Herein, we synthesized an ultrahigh Pt-mass-activity alkaline HER catalyst using microwave reduction method in air. Our catalyst, PtRu@CNT, comprises PtRu alloy nanoparticles uniformly loaded on carbon nanotubes, with Pt and Ru contents of 12.3 wt% and 4.5 wt%, respectively. The PtRu alloy nanoparticles have an average diameter of about 3 nm and a face-centered cubic structure, and the introduction of Ru has led to a modified electronic structure in Pt. As a result, an impressively low HER overpotential of 13 mV was achieved, significantly lower than commercial 20 wt% Pt/C (61 mV). PtRu@CNT exhibited a high turnover frequency based on metal mass of 3.06 s −1 at 100 mV, about 6 times higher than commercial Pt/C (0.46 s −1 at 100 mV), highlighting its excellent intrinsic activity. The HER mechanism of PtRu@CNT is a Volmer-Tafel mechanism, where the rate-limiting step changed to the recombination of hydrogen atoms from initial water dissociation, attributed to the presence of Ru. The alkaline HER activity of PtRu@CNT ranks among the best of currently reported Pt-based catalysts.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Sen-Wang Wang,Zhen-Hong He,Yue Tian,Zhan-Jun Zhu,Yong-Chang Sun,Kuan Wang,Weitao Wang,Yang Yang,Huan Wang,Zhao-Tie Liu
Photothermal CO 2 oxidative dehydrogenation of propane (CO 2 -ODHP) is an environmentally friendly and sustainable route for propylene production and CO 2 utilization. In the present work, we developed a Pt-GaN/SrTiO 3 dual-functional catalyst to facilitate the reaction. The catalyst achieved propylene and CO yields of 1 mmol·g cat -1 ·h -1 and 1.2 mmol·g cat -1 ·h -1 under photothermal conditions at 320 °C, surpassing the performance of previously reported catalysts. Additionally, control experiments and in situ DRIFTS analyses corroborated that GaN and Pt were primarily responsible for the activation of C-H and C O bonds, respectively, and the photothermal route worked via a distinguished intermediate for CO 2 activation in contrast to the thermal route. DFT calculations supported the reaction route involving the coupling direct dehydrogenation of propane and reverse water-gas shift reaction. The present work shines a light on the design of photothermal catalysts with dual functions, particularly for the activation of CO 2 and light hydrocarbons. Additionally, it proposes a strategy to initiate high-temperature reactions at relatively lower temperatures.
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NEW JOURNAL OF CHEMISTRY
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2025
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IF 2.5
Mengyin Liao,Chao Wang,Xuanhua Zhang,Chao Luan,Wenyuan Xu,Zhongyi He
Novel Pt/Co(OH)2-NiO/C catalysts based on carbon black were successfully synthesized using the hydrazine hydrate reduction method and galvanic replacement strategies. They were subsequently tested for their activity in the electrocatalytic oxidation of methanol. It was observed that the peak current density of Pt/Co(OH)2-NiO/C (8.29 A mg-1Pt) was 22.4 times higher than that of commercial Pt/C-JM (0.37 A mg-1Pt). The electrocatalytic activities and durabilities of the synchronously synthesized Pt/Co(OH)2-NiO/C catalysts were significantly better than those of PtCo/C, PtNi/C, and PtCoNi/C-X (X = 200, 400, 600) catalysts synthesized by calcination in Ar at different temperatures. The reason is that the highly dispersed Pt helps to expose more active sites on the catalyst surface, and the addition of Co(OH)2 and NiO alters the electron density of Pt, which reduces the adsorption of intermediate CO, attenuates the toxic effect, and enables more efficient oxidation of methanol.
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APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Yuanyuan Zhang,Zhichun Si,Jian Gao,Yuxiang Liu,Liping Liu,Xiaodong Wu,Rui Ran,Duan Weng
NaOH-promoted Pt/TiO 2 catalysts are successfully prepared by a facile impregnation method assisted by NaOH and tested for the toluene oxidation reaction under visible light irradiation. Keeping molar ratio of Pt:Na = 1:8, the 0.1Pt-Na/TiO 2 catalyst (0.1 mol% Pt) shows excellent catalytic performance with more than 60% of toluene conversion at 45 °C and achieving total toluene removal at 280 °C, which is significantly better than 0.1Pt/TiO 2 catalyst. The structures and properties of catalysts are characterized by XRD, SEM, N 2 adsorption, XPS and UV–vis spectra. The positively charged Pt species stabilized by NaOH are the most active sites for photo-thermal catalyzing toluene oxidation. The influence of Pt loading and the effect of supports (active TiO 2 and inert Al 2 O 3 ) are also discussed.
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GREEN CHEMISTRY
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2012
·Vol. 14
·期 11
·3197-3203
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IF 6.32
Haidong Zhao,Shengchun Yang,Hongjun You,Yanfu Wu,Bingjun Ding
This paper reports the synthesis of platinum concave nanoparticles (NPs) using a freshly-made or recycled KNO3–LiNO3 molten salt (MS). The products obtained from the freshly-made and four-times recycled MSs have similar size and morphology distributions, indicating that the MS can be recycled and reused without any detrimental effect on the character of the particles. Noticeably, no organic capping agents are used in the reaction system. Therefore the as-prepared NPs have a very “clean” surface. Furthermore, the exposed surface steps and high index facets existing on the edges of the as-prepared Pt concave NPs enable them to exhibit a much enhanced electrocatalytic oxidation performance toward methanol. Thus, the MSs have potential to be used as green solvents for the preparation of surfactant or capping agent-free platinum nanostructures.
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Journal of Physical Chemistry C
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2019
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IF 4.309
Xueyang Song,Li Huang,Wenxue He,Chengyong Liu,Fengchun Hu,Yong Jiang,Zhihu Sun,Shiqiang Wei
Electronic metal–support interactions (EMSIs) have opened a new way to tailor the electronic and catalytic properties of supported catalysts. Herein, we demonstrate the EMSIs between Pt nanoparticles and Co(OH)2 flakes grown on SiO2 and show its beneficial effect on enhancing the CO oxidation activity. The EMSI characteristics of the Pt–Co(OH)2/SiO2 catalyst are identified by in situ X-ray absorption fine structure (XAFS) spectroscopy, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and transmission electron microscopy. Quantitative XAFS analysis reveals the presence of metallic-like Pt–Co bonds. The formation of Pt–Co intermetallic bonds allows for electron donation form Co to Pt, leading to the negative charging of the Pt atoms as evidenced by reduced Pt 2p-to-5d electron-transition intensity detected by XAFS spectroscopy and the emergence of a CO adsorption band at 2063 cm–1 in DRIFTS. The significance of EMSIs is manifested by comparing the CO oxidation activity over the Pt–Co(OH)2/SiO2 and Pt/SiO2 catalysts with similar Pt loadings. Pt–Co(OH)2/SiO2 is superior to Pt/SiO2 in both the apparent activation energy (19 vs 64 kJ/mol) and the turnover frequency (0.03 vs 0.003 s–1 at 37 °C). The enhanced activity is attributed to the negative charging of Pt, which downshifts the d-band center and reduces the CO adsorption strength.
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Catalysts
·
2026
·Vol. 16
·期 8
·689
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IF 4.5
Zhongqiang Bao,Yiwei Zhang,Zhenhua Ji,Zhenguo Li,Peng Zhang,Ding Luo,Zhanming Chen,Han Gao,Lei Zhu,Hao Chen
Supported Pt catalysts are highly active for the selective catalytic oxidation of ammonia (NH3-SCO), but their practical use is limited by poor N2selectivity and insufficient hydrothermal durability under high-temperature exhaust conditions. Herein, we report a composition-regulated high-entropy oxide interface strategy to stabilize Pt–Cu dual sites and steer NH3oxidation toward selective N2formation. A series of fluorite-type Ce-based high-entropy oxides, including CeZrLaPrYOx, CeSmLaPrYOx, and CeSnLaPrYOx, were constructed as thermally robust supports for Pt and Cu loading. Among them, PtCu/HEO-Zr calcined at 1000 °C exhibits the best NH3-SCO performance, achieving 90% NH3conversion at 260 °C while maintaining N2selectivity above 80% over a broad temperature window of 100–300 °C under a high weight hourly space velocity of 100,000 mL·g−1·h−1. More importantly, after harsh hydrothermal aging at 800 °C with 10 vol% H2O for 12 h, the catalyst shows negligible activity loss and nearly unchanged N2selectivity, demonstrating exceptional structural and catalytic robustness. Structural and surface analyses reveal that Zr incorporation optimizes the fluorite high-entropy lattice, increases oxygen vacancy concentration, promotes lattice oxygen mobility, strengthens surface acidity, and enriches active Cu2+species, thereby enhancing the interfacial cooperation between NH3activation and oxygen-assisted intermediate conversion. In situ DRIFTS further reveals that PtCu/HEO-Zr favors an Olat-assisted internal selective catalytic reduction pathway, in which adsorbed NH3is activated to -NH2species and subsequently reacts with lattice oxygen-derived intermediates to form N2O22−-like species that decompose into N2and H2O. Meanwhile, the formation of nonselective NOxand N2O products is suppressed. This work highlights high-entropy oxide-supported Pt–Cu interfaces as a promising platform for designing hydrothermally durable and N2-selective NH3-SCO catalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Jiaxuan Cui,Xi Feng,Peng Peng,Tao Chen,Taiyu Zhou,Tianming Li,Li Zhang,An Xue,Zhanming Dou,Fangping Wang,Guifen Fan,Fangfang Zeng
To address the demand for high-precision piezoelectric devices featuring high piezoelectric performance and excellent temperature stability, x Ce-PMN-35PT piezoelectric ceramics were synthesized via cerium doping. Ce ions preferentially occupy the A-site substituting for Pb 2 + , as evidenced by XRD peak shifts and Raman spectral evolution. Combined lattice variation and ionic radius data suggest a valence evolution from Ce 4+ towards Ce 3+ with increasing doping content. The results show that the ceramic with 2 mol% Ce doping exhibits superior comprehensive performance: the piezoelectric coefficient d 33 reaches 780 pC/N, the large-signal piezoelectric coefficient d 33 * is 1101 pm/V, and the unipolar electrostrain only degrades by 6.4% across the broad temperature range from 25 to 125 ℃. Through in situ XRD and Rietveld refinement, this study further elucidated the intrinsic correlation among phase structure, domain switching dynamics, and piezoelectric properties, thereby revealing the underlying mechanism by which cerium doping optimizes material performance. This work not only offers a promising material system for medium-temperature high-precision piezoelectric actuators but also presents an effective strategy for tailoring the properties of PMN-PT-based ceramics.
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CHEMICAL ENGINEERING JOURNAL
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2026
·
IF 12.5
Zhiyuan Jiang,Fan Zhao,Chong Li,Ruihao Wang,Xiaoqi Feng,Mengke Li,Zongqi Wang,Siyi Liu,Kaixuan Yao,Lingmin Yu,Hairong Wang
In-situ growth of NiO nanowalls on MEMS micro-hotplates secures Ohmic contact. • Pt doped into the NiO lattice intrinsically anchors oxygen vacancies. • The device achieves exceptional 60-day stability and 98% RH moisture resistance. • Rapid and ultraselective acetone sensing enables non-invasive diabetes screening. Non-invasive breath acetone analysis offers a promising approach for continuous diabetes monitoring. However, poor long-term stability and material-electrode interfacial drift in p-type metal oxide sensors remain key bottlenecks for their clinical translation. To address these challenges, a Micro-Electro-Mechanical-System (MEMS) acetone sensor was developed via the in-situ growth of Pt-doped NiO nanowalls on a micro-heater chip. Unlike conventional surface modification and physical coating methods, the intrinsic doping of Pt within the NiO lattice and its integration with the substrate address signal drift through a synergistic dual mechanism. Specifically, the in-situ growth minimizes contact resistance drift at the material-electrode interface. Simultaneously, intrinsic Pt lattice doping anchors the active sites, suppressing catalyst thermal agglomeration and preserving structural stability at the gas-solid interface. The optimized sensor exhibits a response of 10.3 to 100 ppm acetone at 200 °C (a 5.7-fold enhancement over pure NiO) and a response time of 37 s. Furthermore, the device demonstrates continuous stability over 60 days and steady-state reliability at the 1.8 ppm clinical diagnostic threshold. It also shows stable moisture resistance (up to 98% relative humidity), maintaining typical p-type characteristics without response reversal phenomena. Supported by competitive co-adsorption density functional theory (DFT) calculations, this moisture tolerance is attributed to a favorable adsorption energy that prioritizes acetone chemisorption over water molecules. Comprehensive characterizations and DFT models indicate that Pt doping triggers localized lattice distortions and charge compensation, increasing the surface oxygen vacancy concentration (35.2%). This theoretically broadens the hole accumulation layer (HAL) and facilitates single-molecule acetone adsorption (−1.12 eV), stabilizing the p-type conduction mechanism. This work provides a stable, drift-resistant acetone sensor capable of sub-ppm trace detection for non-invasive diabetes screening. Download: Download high-res image (204KB) Download: Download full-size image
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Molecular Catalysis
·
2026
·
IF 4.3
Song Wu,Xiangqian Guo,Chenhui Qiu,Jinfeng Zhang,Hui Wan,Guofeng Guan
Light-driven CO 2 conversion to high-value chemicals has emerged as promising but challenging strategy to alleviate global energy and environmental concerns. The efficacy of this process hinges critically on the design of advanced catalysts. Herein, the metallic co-catalysts Pt deliberately anchored onto the surface of La 0.8 Sr 0.2 Co 0.7 Fe 0.3 O 3 (LSCFO) nanotubes was constructed via direct coaxial electrospinning method. Experimental analyses and density functional theory (DFT) simulations confirmed that the incorporation of Pt creates additional active sites and suppresses the recombination of photo-generated electron-hole pairs, thereby enhancing photocatalytic CO 2 reduction capability. Under visible light illumination, the optimized Pt 6 /LSCFO catalyst demonstrated a remarkable CH 3 OH yield of 7.20 μmol·g⁻¹·h⁻¹, outperforming pristine LaCoO 3 by a factor of 3.48. Moreover, the catalyst retains its structural integrity and catalytic performance over four consecutive cycles, demonstrating excellent stability. This work presents an integrated strategy via one-step coaxial electrospinning method for constructing high-performance composite photocatalysts.
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