MICROPOROUS AND MESOPOROUS MATERIALS
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2024
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IF 4.8
Jie Fan,Lutao Mao,Mingli Fu,Peng Liu,Zuliang Wu,Daiqi Ye
The high efficiency and stability of catalysts are crucial for their practical application in toluene oxidation . Herein, a novel octahedral Pt/Mn 3 O 4 -110 catalyst with excellent structural stability was synthesized and 100 % toluene conversion can be achieved at low-temperature 160 °C. XRD and Raman results indicated that the structure of Pt/Mn 3 O 4 -110 can be well maintained after 120 h on-stream reaction, the resistance to H 2 O (3 or 5 vol%) and high concentration toluene (3000 ppm)/CO 2 (5 vol%) tests. In situ DRIFTS comparative studies between Pt/Mn 3 O 4 -110 and Pt/Mn 3 O 4 -100 (30 % toluene conversion at 160 °C) samples demonstrated that the rate-control steps of toluene oxidation on Pt/Mn 3 O 4 -110 and Pt/Mn 3 O 4 -100 were both the further oxidation of benzoate species in the presence of gas-phase oxygen, while the transformation of benzaldehyde to benzoate species was the rate-control step on Pt/Mn 3 O 4 -100 in the absence of gas-phase oxygen. The weaker Mn-O bonds, richer oxygen vacancies and higher mobility of oxygen species on Pt/Mn 3 O 4 -110 sample than that of Pt/Mn 3 O 4 -100 are beneficial for the easier release of lattice oxygen from the surface of catalyst and then participated in toluene oxidation via Mars-van Krevelen mechanism, contributing to easier oxidation of benzaldehyde to benzoate species and formation of formic acid and bicarbonate species.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Xingjie Guo,Ge Gao,Javier Remón,Ya Ma,Zhicheng Jiang,Bi Shi,Daniel C.W. Tsang
Food waste worldwide has been threatening the environment and resulting in high carbon emissions. Although anaerobic fermentation is a potential solution transforming food waste into valuable chemicals, a large amount of the fermentation residue remains as solid waste. For closing the circular economy loop for food waste valorization, we proposed a thermo-chemical activation of a fermentation residue produced from a mixture of food waste and sludge to prepare a nitrogen-enriched, advanced carbon material. This could be used as a support to synthesize Pd/C, Pt/C and Au/C catalysts for the aqueous-phase hydrogenation of vanillin to vanillyl alcohol at mild reaction conditions. The produced alcohol increased sixfold the commercial value of the original aldehyde. The catalytic performance (based on the vanillin conversion and vanillyl alcohol yield) followed the order of Pd/C > Pt/C > Au/C. The Pd/C catalyst showed an excellent catalytic activity (>99% vanillin conversion and > 99% vanillyl alcohol selectivity) at optimized reaction conditions (i.e., 30 °C and 0.7 MPa H 2 for 90 min, with 2 mmol vanillin/10 mg catalyst), along with high reusability and stability (up to four consecutive runs). These catalytic features outperformed those of a commercial Pd/C catalyst owing to: (i) high reduction degree and stabilization of the Pd particles on the carbon support, which accommodated a higher proportion of pyridinic than pyrrolic nitrogen, and (ii) rapid adsorption of the aldehyde group on the catalyst combined with rapid desorption of the newly formed hydroxymethyl group. This exceptional catalytic behavior was corroborated by efficient hydrogenation of other lignin-derived aromatic aldehydes, including p-hydroxybenzaldehyde and syringaldehyde, to their respective alcohols. Our results can bring a novel use for food waste in catalysis and represent a sustainable and efficient conversion of biomass into value-added chemicals and advanced materials.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2024
·
IF 4.3
Xinyi Wang,Yanyan Zhou,Caiyun Chang,Yelin Qiao,Yang Jiang,Miao Gao,Li Hou
The low utilization efficiency and poor stability of carbon-supported Pt nanoparticles (Pt/C) catalyst are two main problems of proton exchange membrane fuel cells (PEMFC), which can improve the catalytic performance by forming alloys and precisely regulating morphology and structures. Here, we introduced a simple and direct method for synthesizing Pt–Ni diamond-shaped pearl nanochains (Pt–Ni DP-NCs) as efficient electrocatalyst for oxygen reduction reaction (ORR). The alloying with Ni could enhance the catalytic activity, but because of leaching out of Ni during the cathodic reaction process, which causes a poor stability. To achieve the optimal point for both high activity and robust stability, a portion of Ni is selectively etched from Pt–Ni DP-NCs precursor in advance. During the process of de-alloying, Pt atoms with high catalytic activity are exposed to the surface of the nanochain after atomic rearrangement, thus obtaining Pt–Ni etched diamond-shaped pearl nanochains (Pt–Ni EDP-NCs) with 1D core-shell structure, which consisted of Pt–Ni as the core and Pt as the shell. Benefitting from the unique 1D core-shell structure and composition, Pt–Ni EDP-NCs-9 (etched for 9 h) exhibits high catalytic activity and robust stability for ORR. The mass activity of the sample Pt–Ni EDP-NCs-9 is 0.43 A/mg Pt , which is 1.65 times higher than that of the Pt–Ni DP-NCs (0.26 A/mg Pt ), and 2.05 times higher than that of commercial Pt/C (0.21 A/mg Pt ). In addition, the 1D core-shell structure enables Pt–Ni EDP-NCs to be highly stable, which only lost by 8.6% of mass activity after 10,000 long cycles, whereas Pt–Ni DP-NCs suffers from a 34% loss under the same conditions. This work provides a strategic approach for designing efficient Pt-based catalysts that simultaneously modulate activity and stability.
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高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Jie Yan,Jin Chen,Xiaofeng Yang,Yueying Wang,Xinle Wang,Jianye Shi,Jing Zhang,Yuzhao Ma,Yanjun Li
The photocatalytic destruction of contaminants in water, such as antibiotics and dyes, has emerged as a hot topic in environmental treatment. The 2D/2D BiOBr/(001)-TiO 2 S-scheme heterojunction , decorated with Pt, was fabricated through in-situ construction and photochemical deposition techniques and utilized to effectively eliminate tetracycline hydrochloride , rhodamine B , and methyl orange. 0.3 wt% has the highest degradation activity when exposed to visible light , and all TC-HCL degradation can be accomplished in 5 min. The photodegradation rate constants of BiOBr and BiOBr/(001)-TiO 2 are 15.3 and 6.3 times higher, respectively. Its satisfactory photocatalytic performance can be attributed to efficient interfacial charge separation, surface plasmon resonance (SPR) effect-induced broadening of the light absorption range, and enhanced migration and separation of photogenerated electron-hole pairs, as well as the formation of an S-scheme heterojunction with strong redox ability. Meanwhile, the larger heterogeneous interface of 2D/2D nanostructures offers efficient charge transfer channels and more reactive sites. Experiments involving electron spin resonance (ESR) and free radical capture demonstrated the generation of not only h + and O 2 − , but also more potent OH radicals. Furthermore, an effective S-scheme heterojunction carrier migration and degradation pathway was proposed based on the experimental results. This study proposes a novel concept for the production of S-scheme heterojunctions photocatalysts that are effective for wastewater pollutant degradation.
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高影响因子
Materials Today Energy
·
2025
·
IF 8.6
Tao Zhang,Ling Meng,Junli Ren,Ning Wang,Lei Du,Xiting Zhang,Lixin Xing,Chunmei Tang,Siyu Ye
As a representative multi-layer energy storage device, zinc-air batteries (ZABs) are inevitably limited by the contact problem between electrode interfaces. Therefore, developing electrode structures with enhanced electron and mass transfer capabilities is crucial for advancing this technology. In this work, Poly(p-phenylene benzobisoxazole)(PBO) carbon paper with in-situ growth Pt catalyst has been prepared and as self-supporting cathode catalyst layer, expanding the traditional three-phase reaction interface to the entire 3D interconnected structure of the air electrode, effectively integrating the catalytic layer with the gas diffusion layer. The modified PBO CO 2 @A-N surface, adorned with uniformly distributed platinum nanoparticles. This modification resulted in exceptional oxygen reduction reaction (ORR) performance, characterized by a substantial electrochemical surface area (200.2 m 2 g Pt −1 ) and an half-wave potential of 0.891 V. In addition, the primary PBO CO 2 @A-N-ZAB demonstrated remarkable peak power densities of 128.1 mW cm −2 in aqueous and 59.1 mW cm −2 in flexible primary zinc-air batteries, underscoring its potential for high-performance energy storage applications.
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FOOD CHEMISTRY
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2025
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IF 9.8
Ying Zhang,Tianya Cao,Baoqing Bai,Xu Jing,Ligang Yu,Jinhua Zhang,Tao Bo,Huilin Liu,Ying Gu,Yukun Yang
The hazard of diethylstilbestrol (DES) towards human health underscored the imperative for highly sensitive and rapid analytical technologies. Herein, a molecularly imprinted electrochemical sensor (MIECS) was innovatively constructed by incorporating the Pt nanoparticles (PtNPs)-decorated MXene/NH 2 -UiO-66 into molecularly imprinted polymer (MIP/MXene/NH 2 -UiO-66/PtNPs) for ultra-sensitive and rapid detection of DES. The introduction of NH 2 -UiO-66 effectively prevented the restacking of MXene and with the synergistic effect of PtNPs, the electrical conductivity of the sensor was significantly enhanced. MIP/MXene/NH 2 -UiO-66/PtNPs-based MIECS not only exhibited excellent electrical conductivity but also possessed the specific cavity to recognize DES. Under optimal experimental conditions, the MIP/MXene/NH 2 -UiO-66/PtNPs-based MIECS exhibited a good relationship with the concentration of DES over a wide range of 1 × 10 −11 –1 × 10 −4 mol L −1 and an extremely low detection limit (1.19 × 10 −12 mol L −1 ). This study demonstrates the judicious design of ternary composite via hetero-interface engineering in the construction of MIECS, providing a new idea for electrochemical sensing.
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PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2025
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IF 17.7
Jiaxin Li,Yan Lv,Xueyan Wu,Xinyu Guo,Zhuojun Yang,Jixi Guo,Tianhua Zhou,Dianzeng Jia
To address the high cost and limited electrochemical endurance of Pt-based electrocatalysts, the appropriate introduction of transition metal-based compounds as supports to disperse and anchor Pt species offers a promising approach for improving catalytic efficiency. In this study, sub-1 nm Pt nanoclusters were uniformly confined on NiO supports with a hierarchical nanotube/nanosheet structure (Pt/NiO/NF) through a combination of spatial domain confinement and annealing. The resulting catalyst exhibited excellent electrocatalytic activity and stability for hydrogen evolution (HER) and urea oxidation reactions (UOR) under alkaline conditions. Structural characterization and density functional theory calculations demonstrated that sub-1 nm Pt nanoclusters were immobilized on the NiO supports by Pt–O–Ni bonds at the interface. The strong metal-support interaction induced massive charge redistribution around the heterointerface, leading to the formation of multiple active sites. The Pt/NiO/NF catalyst only required an overpotential of 12 and 136 mV to actuate current densities of 10 and 100 mA cm −2 for the HER, respectively, and maintained a voltage retention of 96% for 260 h of continuous operation at a current density of 500 mA cm −2 . Notably, in energy-efficient hydrogen production systems coupled with the HER and UOR, the catalyst required cell voltages of 1.37 and 1.53 V to drive current densities of 10 and 50 mA cm −2 , respectively—approximately 300 mV lower than conventional water electrolysis systems. This study presents a novel pathway for designing highly efficient and robust sub-nanometer metal cluster catalysts.
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Nanoscale
·
2017
·Vol. 9
·期 17
·5467-5474
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IF 7.367
Yue Sun,Yunjie Zhou,Cheng Zhu,Lulu Hu,Mumei Han,Aoqi Wang,Hui Huang,Yang Liu,Zhenhui Kang
Highly efficient electrocatalysts remain huge challenges in direct methanol fuel cells (DMFCs). Here, a Pt–Co3O4–CDs/C composite was fabricated as an anode electrocatalyst with low Pt content (12 wt%) by using carbon dots (CDs) and Co3O4 nanoparticles as building blocks. The Pt–Co3O4–CDs/C composite catalyst shows a significantly enhanced electrocatalytic activity (1393.3 mA mg−1 Pt), durability (over 4000 s) and CO-poisoning tolerance. The superior catalytic activity should be attributed to the synergistic effect of CDs, Pt and Co3O4. Furthermore, the Pt–Co3O4–CDs/C catalyst was integrated into a single cell, which exhibits a maximum power density of 45.6 mW cm−2, 1.7 times the cell based on the commercial 20 wt% Pt/C catalyst.
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PubMed
高影响因子
ANALYST
·
2020
·Vol. 145
·期 9
·3245-3256
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IF 3.978
Liping Xu,Jiebin Li,Jiajia Zhang,Junyong Sun,Tian Gan,Yanming Liu
In this work, a disposable molecularly imprinted electrochemical sensor was developed towards the highly sensitive and selective detection of the organophosphorus insecticide phosalone (PAS), employing a home-made carbon paste microelectrode (CPME) modified with a Zr-based metal–organic framework catalyst (Pt-UiO-66) and a mesoporous structured conductive molecularly imprinted polymer (MIP). Pt-UiO-66 octahedra with isolated dispersed Pt nanoparticle active sites were firstly incorporated into the CPME to provide a remarkably amplified signal for voltammetric determination. The mesoporous MIP was then synthesized onto the Pt-UiO-66/CPME via electropolymerization and a subsequent sol–gel process, which could bind the PAS template molecules through hydrogen bond, coordinate bonding, hydrophobic interaction, and π–π stacking interaction. Morphological, structural, and electrochemical characterization studies revealed that this nano-sized MIP provided excellent features for PAS detection, including high porosity, large surface area, enhanced electron-transport ability, greatly improved diffusion capacity, and strong recognition specificity. Therefore, the resulting sensor exhibited an outstanding linearly proportional concentration domain of 0.50 nM–20 μM, low detection limit of 0.078 nM, marked selectivity over certain interferences with similar configurations, considerable repeatability, reproducibility, and stability for the analysis of PAS. Moreover, the sensor was successfully applied for the determination of PAS in agricultural products and environmental samples with results in good compatibility with a chromatographic method, indicative of the high reliability and practicability. Such an electrochemical sensor might open a novel window for the investigation of selective sensing of small organic species from their analogues coupled with the molecular imprinting technique.
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Yajun Zhao,Yanwei Li,Xuping Li,Qianxi Wang,Guang Sun,Jianliang Cao,Yan Wang
Herein, we propose a ZnO and Pt co-modification strategy to boost the NO 2 sensing performance of SnO 2 . Specifically, a ternary Pt/ZnO/SnO 2 composite was prepared by sequentially decorating ZnO and Pt nanoparticles onto a porous nanorod-assembled hierarchical structure (PNRHS) of SnO 2 . The resulting Pt/ZnO/SnO 2 composites were characterized using various techniques, and their sensing properties to NO 2 were investigated. The results reveal that after co-modification with ZnO and Pt, the SnO 2 sensor exhibits remarkable performance enhancements in detecting sub-ppm-level NO 2 , including significantly improved sensitivity, superior gas discrimination capability, and accelerated response kinetics. At its optimal working temperature of 140 °C, the optimized Pt/ZnO/SnO 2 sensor demonstrates a response of 105.6–1 ppm NO 2 , approximately 42.2, 7.4, and 7.9 times than that of the pure SnO 2 (2.5 at 120 °C), ZnO/SnO 2 (14.3 at 150 °C), and Pt/SnO 2 (13.3 at 140 °C) sensors, respectively. The enhanced NO 2 sensitivity of the ternary Pt/ZnO/SnO 2 composite sensor is attributed to the synergistic sensitization effects of the ZnO and Pt modifiers, whose underlying mechanisms are discussed.
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高影响因子
JOURNAL OF POWER SOURCES
·
2019
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IF 7.467
Yudi Niu,Xing Qian,Jiahao Zhuang,Hongyu Liu,Linxi Hou
Owing to the modifiable compositions and morphologies, high-efficiency clean energy catalysts with complex functional structures attract wide-ranging attention. Herein, this report focuses on the controllably morphological MoS 2 -doped NiS 2 /Co 3 S 4 nanocubes which are derived from nickel-cobalt Prussian-blue analogs. After annealing in N 2 flow, MoS 2 /Ni-CoS x porous nanocubes are prepared via regulating the reactant ratios (1/2, 1/1 and 2/1) between (NH 4 ) 2 MoS 4 and Ni–Co Prussian-blue analogs. In the synthesis progress, (NH 4 ) 2 MoS 4 is applied as a bifunctional dopant source, which can expediently offer Mo and S elements simultaneously. The quaternary porous MoS 2 /Ni-CoS x (1/1) with the reasonable chemical composition, considerable specific surface area (86.7 m 2 g −1 ) and excellent electrocatalytic property can be selected as the representative counter electrode catalyst in dye-sensitized solar cells. Furthermore, the solar cell with MoS 2 /Ni-CoS x (1/1) exhibits a higher power conversion efficiency (9.80%) than that of Pt (8.19%) under a standard irradiation.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Yingying Qin,Jian Lu,Fanying Meng,Xinyu Lin,Yonghai Feng,Yongsheng Yan,Minjia Meng
Effectively separating photo-generated charge carriers is usually important but difficult for the high-activity photocatalysis. Fabricating 2D/2D Schottky-Ohmic junction is more beneficial to the spatial separation and transfer of photo-induced charges at the interface of different components due to the matching of distinct two-dimension structure and band alignment, but the manipulation and mastery of junction type (Schottky-Ohmic junction and Z-scheme junction) and electronic structure is an arduous task for preparing satisfactory photocatalysts and investigating the PHE mechanism. In this work, the 2D/2D WO 3 /Pt/ g -C 3 N 4 (WPC) Schottky-Ohmic junction composite photocatalysts is formed via facile hydrothermal and photo-induced deposition method for employing to produce H 2 . The optimized WPC Schottky-Ohmic junction photocatalyst exhibits remarkable photocatalytic H 2 -release performance with ability to produce the amount of H 2 reaches 1299.4 μmol upon exposure to visible light, which is about 1.2 and 11.5 times higher than that of WO 3 / g -C 3 N 4 /Pt (WCP) (1119.4 μmol) and pure CN (113.2 μmol)), respectively. This remarkable enhancement of photocatalytic performance is ascribed to: (i) Schottky-Ohmic junction can strikingly expedite spatial charge separation and elongate electron lifetime, (ii) the 2D/2D structure can shorten the charge transportation distance, (iii) Pt with rich electron density can stably adsorb H + . This work provides a successful paradigm for future fundamental research, and exquisitely designs ideal g -C 3 N 4 -based photocatalysts by simultaneously adjusting and optimizing material structure and electronic dynamics.
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