Journal of Materials Chemistry A
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2024
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IF 10.7
Di-Ye Wei,Ge Zhang,Hong-Jia Wang,Qing-Na Zheng,Jing-Hua Tian,Hua Zhang,Jian-Feng Li
Revealing and understanding water activation and reaction at metal-oxide interfaces is of significant importance. However, it remains a great challenge due to the weak signal of surface-active species and the difficulty of in-situ detection methods. Herein, the water-gas shift reaction mechanism at the Pd-CeO2 interfaces has been systematically studied by using the “borrowing” surface-enhanced Raman spectroscopy (SERS) strategy through the fabrication of Au@CeO2-Pd core-shell satellite structures. Through the combination of in-situ SERS and online mass spectrometry, real-time monitoring of surface intermediate species and reaction products is achieved simultaneously. It is found that CO adsorbed on Pd can either react with the oxygen species formed via water dissociation (the associative mechanism) or the lattice oxygen in CeO2 (the redox mechanism), while the former has a higher activity. This work provides an effective way for the in-situ study of interfacial catalysis and explains the important role of the Pd-CeO2 interfaces in the water-gas shift reaction at a molecular level.
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ACS Sensors
·
2024
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IF 8.2
Ying Li,Xiangyang Wei,Qingyuan Liu,Diming Zang,Rui You
The persistent challenge of poor recovery characteristics of NO2 sensors operated at room temperature remains significant. However, the development of In2O3-based gas sensing materials provides a promising approach to accelerate response and recovery for sub-ppm of NO2 detection at room temperature. Herein, we propose a simple two-step method to synthesize a one-dimensional (1D) In2O3@ZnO heterostructure material with hollow microtubes, by coupling metal–organic frameworks (MOFs) (MIL-68 (In)) and zinc ions. Meanwhile, the In2O3@ZnO composite-based gas sensor exhibits superior sensitivity performance to NO2 under visible light activation. The response value to 5 ppm of NO2 at room temperature is as high as 1800, which is 35 times higher than that of the pure In2O3-based sensor. Additionally, the gas sensor based on the In2O3@ZnO heterostructure demonstrates a significantly reduced response/recovery time of 30 s/67 s compared to the sensor based on pure In2O3 (74 s/235 s). The outstanding gas sensing properties of the In2O3@ZnO heterostructure-based sensors can be attributed to the enhanced photogenerated charge separation efficiency resulting from the heterostructure effect, and the improved receptor function toward NO2, which can increase the reactive sites and gas adsorption capacity. In summary, this work proposes a low-cost and efficient method to synthesize a 1D heterostructure material with microtube structures, which can serve as a fundamental technique for developing high-performance room-temperature gas sensors.
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Catalysts
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2024
·Vol. 14
·期 12
·886
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IF 3.8
Zhiyong Fang,Xiangyu Song
In the study presented herein, a series of TiO2-supported Ru catalysts were prepared through over-impregnation with different amounts of H2O2and applied to the catalytic combustion of dichloromethane (DCM). The experimental results show that the optimal (1 H2O2)-Ru@TiO2catalyst sample yields 90% DCM conversion at 301 °C, which is 40 °C lower than the temperature required by the (0 H2O2)-Ru@TiO2catalyst. This good activity is related to its high number of acid sites (especially Brønsted acid sites), an appropriate amount of uniformly dispersed RuO2particles, and strong interaction between RuO2and the TiO2support. In addition, excessive H2O2leads to the growth and phase segregation of RuO2, which weakens the interaction between RuO2and the TiO2support and decreases catalytic activity. Moreover, H2O2addition also contributes to the stability of catalysts, which possibly results from the re-dispersion of RuO2on the TiO2support during the reaction.
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RARE METALS
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2025
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IF 11
Zheng Lin-Xin,Zhang Liu-Ting,Wu Fu-Ying,Li Hong,Fang Fang
Magnesium hydride (MgH 2 ) is recognized as a promising candidate for solid-state hydrogen storage due to its high hydrogen capacity and safety. However, its highly stable thermodynamics and slow kinetics pose challenges to its commercial application. To effectively solve these problems, Ni–Ti based MOFs (NT-MOF and NT-MOF- x ( x = Ar, O 2 , and H 2 )) are prepared as effective catalysts for MgH 2 , with NT-MOF-Ar/MgH 2 showing the best performance. The onset dehydrogenation temperature of NT-MOF-Ar/MgH 2 is reduced to 197 °C and remains 97% H 2 capacity after 20 cycles. An interface reconstruction which enables its superior catalytic performance is evidenced. By in situ forming a multiphase-multivalence Mg-Ni-Ti-C catalytic interface: Mg 2 Ni/Mg 2 NiH 4 act as a hydrogen pump, multivalence Ti facilitates charge transfer, while amorphous carbon mitigates agglomeration, enhancing long-term performance. Our work verifies the interface reconstruction in a MgH 2 hydrogen storage system, thus paving ways for developing new catalytic mechanisms and efficient catalysts for hydrogen storage and other energy related fields. Graphical
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Natural Gas Industry B
·
2025
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IF 6.5
Kuiqian Ma,Shuoshi Wang,Lei Zhang,Haojun Wu,Jintao Wu,Ping Guo,Lei Huang,Qixuan Zhang,Limiao Wang
There are limited quantitative studies on condensate gas using microfluidics under high-pressure and high-temperature conditions. This study employed microfluidics chips based on real porous media structures to conduct constant volume depletion experiments and investigate the microscopic mechanisms of condensate gas recovery. The aim of the experiments was to reveal the phase-behavior differences between bulk-phase gas and gas contained in porous media. The results revealed that condensate oil recovery in microfluidics experiments was higher than that in PVT cell tests, and nonuniform condensation and evaporation were exclusively observed in the microfluidics experiments. Furthermore, lower pore connectivity resulted in higher depletion recovery, while more developed fractures led to reduced recovery. Specifically, the chip with fewer fractures achieved the highest recovery (71.15 %), whereas the highly fractured chip exhibited the lowest recovery (56.11 %). These findings demonstrate that oil saturation during the process of constant volume depletion (CVD) of gas condensate within porous media is lower than that observed in the PVT cell, thus providing experimental evidence for optimizing condensate gas development in field applications.
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APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Yangyang Li,Ji Li,Ting Li,Xiaoli Cheng,Yingming Xu,Shan Gao,Lihua Huo
Chlorine (Cl 2 ), a toxic and hazardous gas with a pungent odor, has already posed threat to air quality and human health. Therefore, developing chlorine sensors with high response and low power consumption is crucial. In this work, raspberry-like SnO 2 decorated uniformly with SnS nanoparticles was synthesized via a facile solvothermal method followed by an in-situ sulfurization process, which can be used for highly selective and sensitive detection of Cl 2 at 50 °C. The SnS/SnO 2 sensor exhibits ultrahigh response (R g /R a = 1136) toward 10 ppm Cl 2 at optimal working temperature of 50 °C, achieving low detection limit down to 0.05 pp m (S = 1.52), which is 2.5 times higher than that of pure SnO 2 sensor. Its superior sensing performance can be attributed to the formation of the p-n heterostructure, which accelerates electron transfer within the material. More importantly, the as-prepared SnS/SnO 2 sensor still exhibits effective and stable detection performance toward residual chlorine in daily life, significantly extending its practical applicability and providing valuable reference for developing high-performance near room-temperature gas sensors.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Hao-Yu Lian,Yuan Lv,Xian Cheng,Hao-Chen Yang,Xiao-Dong Chao,Yan-Peng Lv
Plasma catalytic reverse water-gas shift (RWGS) reaction is considered efficiently to convert CO 2 into CO for the synergistic effect between plasma and catalyst. However, this synergistic effect has long not been properly evaluated, due to the difficulty in measuring the actual catalyst temperature ( T cat ) during discharge. Herein, we report a novel foam electrode structure plasma catalytic reactor that enables real-time measurement of the central temperature ( T C ) of the foam electrode by a thermocouple during discharge. Since the catalyst is coated onto the foam electrode, T C is much closer to T cat than the commonly used wall temperature ( T W ). Based on T C , a proper evaluation of the synergistic effect is conducted by employing a synergy factor ( SF ) within 196 o C–390 o C. It is found that CO 2 conversion in plasma-catalysis is not only higher than the sum of that in plasma and thermal-catalysis individually, but also breaks the thermodynamic equilibrium limitation. Moreover, this novel reactor exhibits higher CO 2 conversion (30.0 %) for RWGS reaction compared to that in a typical packed-bed plasma catalytic reactor (19.6 %) with a same discharge power of 16.5 W and gas hourly space velocity of 12000 ml/(g·h), demonstrating its potential in the application of RWGS process.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Yue Hu,Lijiu Cao,Yunpeng Gong,Xu Ma,Yufang Chen,Tao Jin
Formaldehyde sensors represent an effective technology for real-time, online monitoring of formaldehyde concentrations. The selectivity of gas-sensitive materials for formaldehyde is a fundamental determinant of sensor performance and is crucial for the development of formaldehyde sensing technology. In this work, Sn-doped Zn-MOFs were employed to fabricate SnO 2 /ZnO micro-nano materials, and their selective response behaviors to formaldehyde were systematically explored. The results demonstrate that 5 % SnO 2 /ZnO, prepared with 5 % Sn doping, exhibits exceptional selectivity for formaldehyde. Under testing conditions of 170 °C and relative humidity below 60 %, the 5 % SnO 2 /ZnO sensor achieved a selectivity coefficient of 0.87 toward 50 ppm formaldehyde, with a response value of 72.8, response and recovery times of 81/30 s, a linear regression coefficient of 0.9997, and a minimum detection limit of 0.047 ppm. Moreover, the 5 % SnO 2 /ZnO sensor demonstrates excellent selectivity, anti-interference capability, and stability for formaldehyde detection. The enhanced formaldehyde selectivity is attributed to the high specific surface area, abundant pore structure, abundant oxygen vacancies, and n–n heterojunctions present in the 5 % SnO 2 /ZnO composite.
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VACUUM
·
2025
·
IF 3.9
Xiaohua Wang,Yanwei Li,Xinhui Jin,Guang Sun,Jianliang Cao,Yan Wang
The pressing need for health and environmental protection has sparked significant interest among researchers in exploring gas sensors made from metal oxide semiconductors (MOSs). Herein, a co-modification approach involving palladium (Pd) and palladium oxide (PdO) is introduced to enhance the sensing properties of indium oxide (In 2 O 3 ) to hydrogen sulfide (H 2 S). Pd and PdO co-modified In 2 O 3 hierarchical porous nanocubes (Pd/PdO-In 2 O 3 HPNCs) were synthesized using a facile hydrothermal method. With the theoretical doping amount of 2 mol%, the synergistic effect of metal Pd and PdO-In 2 O 3 heterojunction made Pd/PdO-In 2 O 3 show excellent sensing performance to H 2 S compared to In 2 O 3 . Specifically, the material features a lower operating temperature (280 vs 300 °C), higher sensitivity (95.06 vs 28.59 to 20 ppm H 2 S; 2.28 vs 1.17–100 ppb H 2 S), and better selectivity (7.41 vs 2.32 times to triethylamine), while also demonstrating satisfactory reproducibility and stability. The synergistic sensitization mechanism of noble metal catalysis and heterojunction in Pd/PdO–In 2 O 3 HPNCs, along with their underlying mechanism, was discussed. Integrating noble metal modification with heterojunctions adds complexity to the structure and composition of the material. The synergistic effects of these two sensitization strategies on the H 2 S sensitization mechanism need further in-depth investigation.
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SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Yuqing Zhu,Qihua Sun,Miaomiao Liu,Weiyu Zhang,Bo Ran,Ping Hu,Ning Tian,Jun Sun,Zhaofeng Wu
Ethylene glycol (C 2 H 6 O 2 ) is an organic compound widely used in industry and daily life. However, it is toxic to animals and humans and can cause serious health problems when ingested. It is important to explore new sensing materials to achieve effective detection of C 2 H 6 O 2 . In this work, pumpkin shaped aspergillus niger with submicron scale has been cultured, aspergillus niger-derived carbon (ANDC) was prepared by simple carbonization, and then novel ANDC/ZIF-8 composite was prepared using a solvothermal method. ANDC/ZIF-8 exhibits considerable selectivity for C 2 H 6 O 2 at room temperature, and the detection limit was 0.84 ppm and the response/recovery time was 13.9/10.6 s, respectively. Compared to ANDC, the gas sensitive performance of ANDC/ZIF-8 composite is greatly improved. This enhancement should be mainly attributed to the formation of heterogeneous junctions and hydrogen bonding interaction between ZIF-8 and C 2 H 6 O 2 . In this way, the mould with regular shapes produced by biomanufacturing was prepared into biochar, which in turn created a new type of gas sensing material and pioneered the introduction of biomanufacturing into the preparation process of gas sensing materials.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xiaoli Xu,Guorong Sun,Mengyu Wang,Hongtao Jiang,Wei Ma,Wangwang Liu,Zhihong Jin,Jiamin Zhu,Guoqing Chang,Shuyi Ma
Overcoming the persistent challenges of high operating temperatures and poor selectivity in metal oxide semiconductor (MOS) gas sensors, this work enhances defect sites in the sensing material through heterostructure construction and builds mesoporous architectures using MOF-derived carbon skeletons as templates. The synergistic effects of multiple mechanisms significantly improve gas-sensing performance, successfully fabricating a ZnO/PCS flexible room-temperature gas sensor with exceptional room-temperature DMF detection capabilities. The nitrogen-containing porous carbon skeletons (PCSs) template shows a stable mesoporous microstructure with large pore volume. Further gas-sensitive investigations show that the ZnO/PCS flexible sensor presents high sensitivity (100 ppm of DMF, 68.06%), reduced response/recovery time (44 s/45 s), and low limit of detection (15.74 ppb) at room temperature (RT). In addition, the response decreases by only 5.65% after 200 bends, which proves the good flexible stability of the sensor. It is worth noting that hydrophobic PCSs also contribute to the good moisture resistance of the ZnO/PCS FRT sensor. The composite of ZnO and PCS porous carbon skeleton forms heterogeneous interfaces. The resulting ZnO/PCS heterostructure achieves remarkable characteristics: an ultrahigh specific surface area (214.86 m2 g–1), abundant oxygen vacancies (66.06%), and nitrogen-facilitated electron transfer-collectively enabling superior surface redox activity upon gas exposure. This work verifies a possible and facile strategy for the realization of FRT sensing metal oxide semiconductors by using MOF-derived PCSs, which may have great application potential in the field of flexible RT sensors.
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JOURNAL OF MEMBRANE SCIENCE
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2025
·
IF 9
Changchun Wang,Xingming Jie,Lixin Li,Guodong Kang,Dandan Liu,Yiming Cao,Yi Wei,Lina Wang
Thermally rearranged (TR) polymers are well known for their exceptional gas permeability and have been considered as promising candidates for hollow fiber membranes in natural gas purification. However, the conventional TR process requires temperatures above 400 °C, which often compromises both gas transport performance and mechanical integrity. In this study, we developed Claisen thermal rearrangement (CTR) hollow fiber membranes derived from allyl-functionalized copolyimides under mild thermal conditions. By exploiting the [3,3]-sigmatropic rearrangement, the required rearrangement temperature was reduced to 160 °C. The resulting CTR membranes demonstrated a CO 2 permeance of 281.57 GPU with a CO 2 /CH 4 selectivity of 25.37 after thermal treatment at 200 °C. Notably, CTR fibers exhibited excellent resistance to CO 2 plasticization up to 2.0 MPa, markedly superior to their precursor membranes. Furthermore, the elastic modulus of CTR hollow fiber membranes increased by more than an order of magnitude, reaching 1.56 GPa. Overall, this work presents an energy-efficient strategy based on [3,3]-sigmatropic rearrangement for fabricating high-performance hollow fiber membranes, holding great potential for application in natural gas purification.
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