SENSORS AND ACTUATORS B-CHEMICAL
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2025
·
IF 7.7
Jintao Wu,Yanghai Gui,Kuan Tian,Shuaishuai Zhao,Dongjie Guo,Huishi Guo,Xiaoyun Qin,Xiaomei Qin,Yao Guo
As hydrogen is widely used as a clean energy source, the hazards of its flammable and explosive properties are gradually emphasized. Therefore, it is imminent to develop a hydrogen sensor with high response, fast detection speed and low detection limit. In this paper, a PdO/WO 3 composite with fruit-leaf-like structure was synthesized by in-situ hydrothermal and self-assembly impregnation method, and its H 2 sensing performance was investigated. The results show that the self-assembled loading of PdO can greatly improve the H 2 sensing performance of WO 3 , in which the PdO/WO 3 -1 sensor exhibits a very high response value (338.7) and a very short response/recovery time (1 s/4 s) at 120°C to 100 ppm H 2 . The enhanced sensor performance is mainly due to the catalytic effect of the noble metal PdO on H 2 and the synergistic effect between WO 3 and PdO. The growth rhythm of PdO nanoparticles and the effect on the H 2 sensing performance of PdO/WO 3 composites were also explained by varying the concentration of PdCl 2 solution. The density functional theory calculation proves that the hydrogen sensing performance is improved after the combination of PdO and WO 3 . This study provides a feasible solution for the development of high-performance WO 3 -based H 2 sensors.
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
VACUUM
·
2023
·
IF 4
Zhen Zhao,Lei Zhang,Yinghua Zhuang,Yang Guo,Hongming Zhang,Wanli Jiao
To achieve rapid detection of hydrogen sulfide (H 2 S) gas at lower temperatures, We present a high-performance PdO/ZnO/ZnS-based H 2 S gas sensor, which was synthesized using a hydrothermal synthesis method in conjunction with an in situ sulfuration process and surface modification by PdO. Vacuum sintering to prevent high temperature oxidation of ZnS. The introduction of PdO not only makes the sheet ZnO/ZnS turn to spherical-like, but also increased the content of adsorbed oxygen. Compared with ZnO/ZnS sample, the PdO/ZnO/ZnS based sensor exhibited a higher response value of 212.4 to 10 ppm H 2 S at lower temperature of 100 °C, with response and recovery times of 2.9 and 1.7 min, respectively. In addition, excellent performance is demonstrated in terms of gas selectivity , repeatability and long-term stability during testing.
研究领域:
材料科学
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化学传感器
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环境监测
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DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Lulu Kong,DeZhu Chen,Xiaolong Zhang,Lin Zhou,Yongming Deng,Shaohua Wei
The growth of oxides on the surface of noble metals and the introduction of alloys are effective methods to enhance the catalytic activity of noble metals. However, the fabrication of noble metal oxides always involves harsh experimental conditions and the oxidation degree could not be controlled. Herein, a simple, fast, and controlled Pd oxidation method by mixing Hg2+ and Pd nanosheets (PdNSs) under mild conditions to form PdxHgy(PdO)z (PHOs) was reported, which consists of the Pd–Hg alloy and PdO. The density functional theory (DFT) calculation and experiment results proved that the Hg atom incorporation promotes the nearby Pd–Pd bond breaking, initiating a cascade of PdO generation. More precisely, 1 Hg atom incorporation induced ∼8 Pd atom oxidation, ensuring that the oxidation degree of Pd could be easily controlled by adjusting the ratio of Hg2+ and PdNS. As a peroxidase-mimicking nanozyme, the PHO affinity for its substrate could be 21.7- and 123.6-fold greater than that of the PdNS and the natural peroxidase (HRP), respectively. For the colorimetric immunoassay of carcinoembryonic antigen (CEA) detection, PHO has an ultralow detection limit of 1.33 pg mL–1, which is ∼8.6 and ∼282 times lower than that of the PdNS and the natural HRP, respectively.
研究领域:
生物化学
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医学诊断
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材料科学
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产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2023
·
IF 3.7
Junfei Chen,Zhenzhou Tan,Haolin Yang,Xiaohan Wang,Zebao Rui
A post-synthetic modification strategy for anchoring PdO nanoparticles on the Beta zeolite surface and obtaining stable and highly dispersed PdO sites with abundant active Pd n+ (0 < n < 2) species was reported. The modified Beta supported Pd catalyst with a 0.94 wt% Pd loading amount shows (>) 99% methane conversion at 375 °C with a space velocity of 30,000 mL h −1 g −1 and a satisfied long-term (>30 h) CH 4 oxidation stability at 340 °C. Such a post-synthetic strategy provides a new way to disperse and stabilize noble metal particles on zeolite support for harsh catalytic process.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2019
·Vol. 95
·期 3
·862-874
·
IF 2.659
Fei Rao,Gangqiang Zhu,Miaomiao Wang,Siyaka Mj Zubairu,Jianhong Peng,Jianzhi Gao,Mirabbos Hojamberdiev
BACKGROUND Photocatalysis is one of the effective ways to solve the problem of water and gas pollution. An excellent photocatalyst should have the following advantages: efficient photocatalytic activity for gas and water pollutants, recyclable and stable characteristics, non-toxic and low-cost. Constructing heterojunctions and introducing oxygen vacancies (OVs) are two effective measures to achieve these targets. RESULTS It is found that the 1.0% Pd/PdO/β-Bi 2 O 3 exhibits the best photocatalytic activity with an efficiency of 97.4% for Bisphenol A (BPA) degradation and 47.6% for nitric oxide (NO) removal within 30 min. The 1.0% Pd/PdO/β-Bi 2 O 3 composite shows 23.3% efficiency in the photodegradation of BPA under 595 nm monochromatic light irradiation, while β-Bi 2 O 3 tends to be invalid. Moreover, the OVs promote the removal of NO without irradiation. CONCLUSION In this work, a novel ternary Pd/PdO/β-Bi 2 O 3 material as high-performance photocatalyst for the BPA degradation and NO removal was synthesized. The presence of OVs promotes the activation of the oxygen molecule, thereby facilitating the photocatalytic process. The p - n junction of PdO/β-Bi 2 O 3 and the Schottky barrier of Pd/β-Bi 2 O 3 significantly limit the recombination of photoinduced electron–hole pairs in the composite. Furthermore, an artifact in the electron spin resonance (ESR) spectrum obtained by spin trapping with 5,5-dimethyl-1-pyrroline N -oxide (DMPO) as adducts confirms that both hydroxyl radical (•OH) and superoxide radical (•O 2 − ) species are involved in the photocatalytic process. The present work offers a new perspective for developing the composite photocatalysts with high efficiency through loading of metal nanoparticles and creating an heterojunction. © 2019 Society of Chemical Industry
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Nan Zhang,Yang Lu,Yizhuo Fan,Jingran Zhou,Xin Li,Samira Adimi,Caixia Liu,Shengping Ruan
Designing novel structures and selecting the right catalyst play significant roles to overcome the inherent limitations of chemical sensors. The transition metal-organic framework is one of the most promising precursors for the development of advanced gas sensors with high porosity. In this work, novel ZnO/ZnCo 2 O 4 hetero-structured microspheres synthesized from a Zn–Co-Prussian blue analog (PBA) precursor is rationally designed by changing the temperature of thermal treatment and the decoration of PdO nanoparticles is carried out by a water bath strategy. Formaldehyde-sensing properties of the sensors based on pure ZnCo 2 O 4 NPs, ZZCO-500, ZZCO-700, and PdO-ZZCO microspheres are studied in detail. The experiment results show that the PdO-ZnO/ZnCo 2 O 4 microsphere-based sensor has a higher response value (about 26.9), better selectivity (S formaldehyde /S ethanol = 5) and rapid response and recovery (9/14 s) towards 100 ppm formaldehyde as well as a low detection limit (0.2 ppm). The improvement in formaldehyde-sensing properties could be attributed to the larger specific surface areas (SSA), abundant active sites, the heterojunctions and the catalytic effect of PdO nanoparticles. This work provides a feasible method for synthesizing MOF-derived hetero-structured nanomaterials, demonstrating the potential application for monitoring indoor air pollutants.
研究领域:
材料科学
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传感器技术
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环境监测
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Xiao Liu,Yanjun Zhang,Wuxia Zhang,Gang Cheng,Fan Tian,Wei Li,Jinyan Xiong
Solar-driven photocatalytic hydrogen production from water splitting holds significant potential in addressing the energy crisis and environmental pollution. However, rapid recombination of photogenerated carriers and insufficient surface catalytic reaction kinetics hinder the photocatalytic process. Constructing the catalytic systems with multi-channel charge-separation can effectively alleviate those issues. In this work, ternary PdO@TiO 2 -Cu 2 O composites have been synthesized through precursor calcination and low-temperature reduction, where PdO and Cu 2 O nanoparticles couple with the TiO 2 nanorods. Comparing to single TiO 2 , binary PdO@TiO 2 and TiO 2 -Cu 2 O, the PdO@TiO 2 -Cu 2 O hybrid exhibits enhanced photocatalytic hydrogen production performance (5831μmol g -1 h −1 ), with a hydrogen production rate more than three times that of single TiO 2 . Based on the band structures of TiO 2 and Cu 2 O, along with the photochemical/electrochemical, in-situ EPR, Photoluminescence (PL) tests, and work function calculations, the formation of an S-scheme heterojunction at the TiO 2 -Cu 2 O interface under light illumination facilitates the recombination of electrons in the conduction band (CB) of TiO 2 with holes in the valence band (VB) of Cu 2 O. In this regard, the established built-in electric field significantly accelerates the transfer of photogenerated charges while preserving their respective strong oxidation and reduction capabilities. Meanwhile, the introduction of PdO enriches the holes and further enhances the rate of charge separation. This S-scheme heterojunction with directional charge transfer and oxidation cocatalyst collectively form multi-channels of charge separation, optimizing charge migration and enabling efficient hydrogen production, thus improving the photocatalytic capability of pristine TiO 2 . This study provides a rational approach to construct efficient S-scheme heterojunction/oxidation cocatalyst multi-component catalytic systems for water splitting into hydrogen.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Zhiheng Wang,Jiali Huang,Guancong Jiang,Tuo Ji,Han Lin,Liwen Mu,Xiaohua Lu,Jiahua Zhu
In heterogeneous reactions, catalyst support plays an important role in tuning catalytic activity of metallic structures and regulating fluid transport during reaction, while it needs to be engineered to balance reaction and diffusion for optimized outcome. In this work, a combined delignification and activation strategy was used to prepare a series of carbon supports with varied porous structures and surface properties. Pd was then loaded on the carbon supports for direct synthesis of H 2 O 2 (DSHP) reaction. Results indicated that highly developed meso-macropore structures significantly promoted the dispersion of Pd and exposed more active sites for H 2 dissociation. However, the enrichment of pore structure brought excessive surface oxygen groups, leading to the transition of Pd from Pd 0 to PdO and thus inhibiting the hydrogenation activity. The optimized catalyst, with desirable porous structure and appropriate Pd 0 /PdO ratio, exhibited an extraordinarily high H 2 O 2 productivity of 37346.42 mmol g Pd −1 h −1 under atmospheric conditions. This work provided a case study on the regulation of reactivity and diffusion through catalyst support engineering, demonstrating the essential role of matched reaction–diffusion in heterogeneous DSHP reactions.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jie Hu,Xueqing Xiong,Wangwang Guan,Haizhu Long
To realize a synergistic effect between composition engineering and morphology modulation, PdO–Fe 2 O 3 heterojunction architectures with various morphologies were fabricated by facile hydrothermal and solution impregnation methods. Afterwards, gas sensing devices were constructed from the as-prepared PdO–Fe 2 O 3 composites, and their parameters were systematically investigated. The obtained results revealed that all PdO–Fe 2 O 3 sensors exhibited excellent selectivity properties and high responses to target gases. Importantly, an urchin-like PdO–Fe 2 O 3 sensing device produced the largest response of 75 to 50 ppm hydrogen sulfide at a PdO concentration of 4 wt%, which was approximately four times greater than that of a spherical PdO–Fe 2 O 3 sensor. The urchin-like sensor was also characterized by the highest response recovery efficiency, water resistance, and long-term stability. Furthermore, the sensing mechanism of the fabricated PdO–Fe 2 O 3 composite-based gas sensors was discussed comprehensively.
研究领域:
材料科学
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化学传感器
·
纳米技术
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产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-14
·
IF 3.159
Duan Dong,Hao Chunxi,Wang Liqun,Shi Wenyu,Wang Haiyang,He Gege,Gao Lumei,Sun Zhanbo
A PdO/CeO 2 composite with a rod-like nanoporous skeletal structure was prepared by combining the dealloying of Al-Ce-Pd alloy ribbons with calcination. For CO oxidation and CH 4 combustion, the nanoporous PdO/CeO 2 composite exhibits excellent catalytic activity, and the complete reaction temperatures of CO and CH 4 are 80 °C and 380 °C, respectively. In addition, the composite possesses excellent cycle stability, CO 2 toxicity, and water resistance, and the catalytic activity hardly decreases after 100 h of long-term stability testing in the presence of water vapour (2 × 10 5 ppm). The results of a series of characterizations indicate that the enhanced catalytic activity can be attributed to the good dispersion of the PdO nanoparticles, large specific surface area, strong redox capacity, interaction between PdO and CeO 2 , and more surface active oxygen on PdO. The results of the characterization and experiments also indicate that the PdO nanoparticles, prepared by combining dealloying and calcination, have a stronger catalytic activity than do Pd nanoparticles. Finally, a simple model is used to summarize the catalytic mechanism of the PdO/CeO 2 composite. It is hoped that this work will provide insights into the development of high-activity catalysts.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Xuemin Cao,Kun Zhang,Yu Wang,Peng He
The carbonylation of formaldehyde offers a promising, cost-effective, and environmentally friendly method for synthesizing glycolic acid, a crucial monomer in biodegradable plastics. This study highlights the development and optimization of a bifunctional PdO/ZSM-5 zeolite catalyst for this process. Investigations via various spectroscopic techniques reveal that Pd species, predominantly in the form of PdO, enhance the CO activation, thereby boosting the formaldehyde carbonylation reaction rate significantly. The optimal catalytic performance was observed with a Pd-loading of 2 wt %. Notably, excessive Pd loading was found to impede the catalytic performance by overoccupying acid sites, thereby reducing its capacity to activate formaldehyde. The concurrent activation of formaldehyde and CO at the Brønsted acid site and the PdO site, respectively, through a Langmuir–Hinshelwood mechanism is key to the enhanced catalytic performance. These findings underscore the importance of CO activation in improving the formaldehyde carbonylation process, offering vital insights for catalyst optimization.
研究领域:
催化化学
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化学合成
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环境化学
·
高分子科学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Tao Wang,Chao Xiao,Qiao Yu,Zhilin Chen,Shuming Peng
Development of a stable catalyst resistant to steam-induced sintering (10 vol%−15 vol% H 2 O, 450–550 °C) is challenging for catalytic combustion/oxidation of methane. We use the silicalite-1's internal defects to trap PdO clusters to construct a stable catalyst (PdO/silicalite-1). Silicalite-1 with sufficient amounts of silanol defects and ion exchange at alkaline condition are critical for this defect-trapping strategy. PdO/silicalite-1 shows long-term super-stability with respect to the temperatures and steam concentrations. The conversion remained stable over 200 h at 500 °C (10 vol% H 2 O) and declined slightly during 380 h at 550 °C (10 vol% H 2 O). PdO/silicalite-1's catalytic activity deteriorated slightly after hydrothermal aging at 750 °C or thermal aging at 850 °C. Electron microscopy reveals two growth modes for PdO clusters within silicalite-1 (PdO in ) and on the external surface (PdO surf ). PdO surf clusters agglomerate into PdO particles of 5–15 nm directly, but PdO in clusters first fuse into strip-shaped PdO in clusters, then migrate outwards and further agglomerate into PdO nanoparticles .
研究领域:
催化化学
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材料科学
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环境化学
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）