MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Xinming Nie,Yuanyuan Liu,Xinting Qian,Yunsheng Shang,Luqing Chen,Xinxin Shi,Mengbao Fan,Lu-Lu Qu
A high-performance aldehyde sensor is of great significance for the detection of construction machinery exhaust gas and the analysis of environmental gas. Herein, we developed a novel aerogel SERS substrate of 4-Aminothiophenol (4-ATP) decorated three-dimensional (3D) porous structure using graphene oxide (GO), Au nanoparticles (Au NPs) and MXene as precursors. Benefiting from the synergistic effect of metal conductivity of MXene, the oxygen-enriched surface of GO and the high-density of “hot spots” (Au NPs), the 3D MXene/Au/GO/4-ATP aerogel structure exhibits enhanced capture efficiency of gaseous aldehyde and plasma enhancement for in-situ aldehyde gas detection. More importantly, a hot-blowing assisted SERS detection device was designed for gaseous aldehydes sensing. The SERS detection device responses to gaseous aldehyde molecules in simulated exhaust gas, offering fast detection time, high sensitivity, excellent reproducibility, and distinct selectivity. This work provides a potential strategy for monitoring harmful emissions, and promotes the design of a multi-functional SERS platform for complex gas sensing.
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高影响因子
APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Zijian Su,Peng Du,Wei Hou,Qijie Guo,Qiuyu Li,Yuanbo Zhang
Along with the rapid development of modern industry and the continuous improvement of environmental protection standards, it was imperative to detect harmful gases. In this study, the SnO/SnO 2 core–shell homojunction was successfully prepared by the vapor-oxidate-solid (VOS) method and a simple heating experimental device with Sn-bearing e-waste as raw material. The gradient oxidation of SnO was researched by detecting the crystal structure, micro-morphology and surface chemical state at different temperatures. The SnO/SnO 2 -based sensor was used for the gas sensitivity test of NO 2 . At 150 °C, high response value, response time and recovery time of SnO/SnO 2 homojunction to 50 ppm NO 2 were 421, 39 s and 27 s, respectively, which had better sensing performance compared with commercial SnO 2 . Moreover, the mechanism analysis indicated that homojunction and oxygen vacancies were important reasons for improving the gas-sensing performance of SnO/SnO 2 homojunction. It provided an effective strategy for recycling Sn resources and promoted the application prospect of SnO/SnO 2 homojunction in the NO 2 sensing field.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Feifei Li,Yufu Liu,Yi He,Guanjun Gao,Xuzhuang Yang
Single Zn 0 atoms have never been employed as active sites for the reverse water gas shift (RWGS) reaction. Achieving complete CO selectivity at equilibrium CO 2 conversion using single Zn atoms for the RWGS reaction remains a significant challenge. Here, we report zinc single-atom catalysts (Zn SACs) with active species identified as Zn N 4 , Zn N 3 , Zn N 2 , and Zn 0 , synthesized from a ZIF-8 precursor via hydrogen reduction. These catalysts exhibit exceptional RWGS activity, with performance following the order: Zn-N 4 < Zn-N 3 < Zn-N 2 < Zn 0 . The Zn 0 catalyst achieves a remarkable turnover frequency (TOF) of 95.4 mol CO2 mol Zn −1 h −1 . Mechanistic studies reveal that Zn 0 sites selectively chemisorb and dissociate CO 2 into CO and active oxygen, which directly reacts with gaseous H 2 to form H 2 O via the Eley-Rideal ( E -R) mechanism, diverging from the traditional Langmuir-Hinshelwood (L-H) pathway. These findings provide insights into the new active species and reaction mechanisms of Zn SACs, advancing sustainable catalytic systems for CO 2 conversion.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Wei Ding,Jun Wang,Hongxia Zhao,Ziqi Zhang,Dongpo Wei,Kewei Zhang
The limited selectivity of metal oxide semiconductor (MOS) gas sensors poses a significant challenge in accurately identifying volatile organic compounds (VOCs) within industrial environments. Here, platinum-modified tungsten oxide (Pt/WO 3 ) composite was successfully prepared through in-situ reduction, which not only possesses superior gas-sensing performance towards ppm-level triethylamine but also achieves robust humidity resistance and long-term stability. Benefiting from the catalytic sensitization of noble metal, the as-fabricated Pt/WO 3 sensor exhibits improved sensitivity towards triethylamine as compared with the pristine tungsten oxide (WO 3 ) sensor. To minish low-frequency noise and promote selectivity, the sensor response curves were fitted and processed with discrete wavelet transform (DWT) for 4-level decomposition. Accompanied with multivariate feature extraction, an artificial neural network (ANN) algorithm was developed to categorize and identify multiple VOCs including triethylamine, ammonia, and isopropanol, enabling a decision boundary with 95.2 % accuracy. Moreover, the prediction of unknown gas concentration was successfully achieved by linear regression model after training a series of as-known concentrations. This work not only offers a rational solution to design high-performance gas sensors but also provides an intelligent strategy to identify gas concentration under multiple VOCs.
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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
Zhonghang Xia,Han Zheng,Huiming Ji,Yiwen Zhang
H 2 gas sensors with facile preparation, high sensitivity and low detection limits are crucial for hydrogen energy safety. Given the high surface area, abundant porosity and high stability, zeolitic imidazolate frameworks (ZIFs) provide a potential development path for hydrogen sensors. In this work, ZIF-67@ZIF-8 modified with palladium nanoparticles (Pd NPs) was synthesized by room-temperature solution synthesis and NaBH 4 reduction method. The xPd@ZIF-67@ZIF-8 (x=10, 20, 30, 40) samples exhibit a rough mesoporous surface due to etching of NaBH 4 and feature a uniform distribution of Pd NPs. The modification of Pd NPs broadens the hole accumulation layer (HAL) of ZIF-67@ZIF-8 and decreases the resistance (from ~500 to 1 MΩ), thereby reducing the operating temperature. It is noteworthy that the operating temperature zone of 20 Pd@ZIF-67@ZIF-8 is 85-115 ℃ with higher hydrogen sensitivity than the other sensors at optimum operating temperature (≥ 100 ℃). Meanwhile, the 20 Pd@ZIF-67@ZIF-8 sensor demonstrates a rapid response speed to low concentration H 2 (response to 50 ppm H 2 within 8 s) on account of the spillover and catalytic effects of Pd NPs. Furthermore, the 20 Pd@ZIF-67@ZIF-8 sensor possesses a relatively low theoretical detection limit (16.5 ppb), and exhibits excellent moisture resistance, cycle and long-term stability. This sensitive material provides a prospective avenue for hydrogen energy safety monitoring.
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CONSTRUCTION AND BUILDING MATERIALS
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2025
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IF 8
Xiaohua Li,Miaomiao Hu,Qiang Wang,Ming Liu,Jianwei Wang,Yongxu Xie,Jintang Guo
Phase change microcapsules can reduce the exothermic hydration of cement paste and avoid natural gas hydrates decomposition during cementing in deepwater fields. Phase change microcapsules with low heat storage efficiency can lead to excessive reduction in the early compressive strength of cement stones due to the high mass fractions and the huge difference in strength with cement. Phase change microcapsules (MBPCM) with high thermal storage efficiency were prepared by emulsion polymerization process using epoxy resin as the shell. Introducing hydrophobically modified boron nitride (BNVT) can improve the energy storage efficiency of microcapsules. The produced MBPCM had a typical core-shell structure with an average particle size of around 716 nm and a shell thickness of about 23 nm. According to the experimental findings, the phase change enthalpy of the microcapsules was 185 J/g. The supercooling temperature of MBPCM containing 5 wt% BNVT was only 0.70°C, and the thermal conductivity was improved by about 131.0 %. The incorporation of 7 % MBPCM into cement resulted in a notable reduction of 12.23°C in the hydration temperature of the cement, alongside a substantial decrease of 46.9 % in the exothermic heat of hydration. Moreover, MBPCM improves the dispersion of the cement paste and reduces the porosity of the cement stone, resulting in a 6 % increase in the compressive strength of the cement. The prepared microcapsules effectively reduced the exothermic heat of cement hydration, avoided the decomposition of natural gas hydrates, and improved the safety of extraction.
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ACS Sustainable Chemistry & Engineering
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2025
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IF 7.3
Ziyang Xu,Ying Shen,Liang Chen,Chunbo Wang
Direct CO2 hydrogenation from primary carbon sources such as flue gas offers an attractive route for carbon-neutral fuel synthesis, yet the presence of O2 severely impairs catalyst performance due to preferential H2–O2 reactions and subsequent catalyst deactivation. Herein, we report a surface-engineered Ni/γ-Al2O3 (Ni/A) catalyst modified by Cu doping (Ni–Cu1/A), which exhibits enhanced oxygen resistance and sustained CH4 produce under oxidative conditions. Guided by a descriptor τ, defined as the ratio of O2 to CO2 adsorption energies, Cu was identified as an effective dopant to suppress O2 adsorption while preserving CO2 activation. Under a challenging atmosphere containing 6% O2, the optimized Ni–Cu1/A catalyst achieved a CH4 STY of 76.4 mmol gcat–1 h–1, significantly outperforming the undoped Ni/A catalyst, which drops to 63.1 mmol gcat–1 h–1 under the same conditions. Mechanistic analysis reveals that Cu incorporation weakens O2 adsorption by regulation of electronic structure, thereby mitigating exothermic H2–O2 side reactions and stabilizing Ni0 sites. This work presents a practical and scalable strategy for CO2 methanation in the presence of O2, offering a promising approach for direct catalytic conversion of flue gas by leveraging selective surface adsorption and electronic structure modulation.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Zichen Zheng,Kewei Liu,Yiwen Zhou,Kaichun Xu,Liangchao Guo,Marc Debliquy,Carla Bittencourt,Chao Zhang
The simultaneous optimization of sensitivity and humidity tolerance in metal oxide semiconductor (MOS)-based gas sensors remains a critical challenge for practical volatile compound (VOC) detection. This work demonstrates a defect engineering strategy to modulate the electronic and surface properties of NiWO 4 microstructures through controlled hydrogen reduction. Systematic annealing protocols induced a high density of oxygen vacancy (O V ) via selective oxygen removal, as confirmed by structural and spectroscopic characterization. The engineered oxygen vacancies exhibited dual functionality: (1) enhanced bulk electron transport through improved conductivity and (2) boosted surface reactivity via optimized adsorption sites. The optimized NiWO 4 sensor achieved exceptional performance for 1-octen-3-ol detection at 40 ppm, including a high response value (R a /R g = 20.6), fast response time (22 s), and remarkable relative humidity resilience (19.7 % response drift across 20–80 % RH). The mechanism underlying enhanced sensing performance is elucidated through an oxygen adsorption model and molecular dynamics (MD) simulation. This study establishes hydrogen reduction as an effective approach for developing durable NiWO 4 sensors with combined high sensitivity and environmental stability, advancing their applicability in real-world atmospheric monitoring systems.
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JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Yongnian Huang,Chunju He
Polyimide (PI) gas separation membranes have long faced the challenge of inherent "trade-off" effect between gas permeability and selectivity, which severely hinders their large-scale application. In this study, the balance between gas permeability and selectivity was finely tuned through the combination of thermal rearrangement and cyano-induced thermal crosslinking, where a novel post-grafting modification method was employed to quantitatively introduce cyano groups onto hydroxyl-containing PI, followed by thermal treatment. Through the grafting content regulation, the resulting PI membranes achieved a pure CO 2 permeability of 500.65 Barrer and a CO 2 /CH 4 ideal selectivity of 39.58, surpassing the 2008 Robeson upper bound and exhibiting rapid gas sieving characteristics. Moreover, the CO 2 /CH 4 mixed-gas separation performance of the membrane was also remarkable, exceeding the 2018 CO 2 /CH 4 mixed-gas upper bound. This study proposes a "two-birds-one-stone" strategy that simultaneously addresses the challenges of the "trade-off" effect as well as plasticization and aging resistance in PI membranes, providing a new general strategy for the development of highly efficient PI-based membrane materials.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Liping Du,Limo He,Song Hu,Sheng Su,Yi Wang,Long Jiang,Jun Xu,Kai Xu,Jun Xiang
The low-temperature water-gas shift (WGS) reaction confronts critical challenges of sluggish kinetics, inadequate H 2 yield and CO conversion, necessitating the development of high-activity catalysts to effective clean energy production with reduced energy consumption. In this study, we systematically investigate the relationship between the physicochemical properties of Cu-based catalysts supported on CeO 2 with tailored morphologies (nanorods, nanospheres, and nanocubes) and catalytic performance. Cu-CeO 2 (R) achieves 52.3 % CO conversion and 79.88 mL/gH 2 O H 2 production at 370 °C—nearly twice those of Cu-CeO 2 (P) under identical conditions—with an apparent activation energy of 55.25 kJ·mol −1 . This outstanding performance stems from proper oxygen vacancy concentration (OVC, 2.23 × 10 21 cm −3 ) and ordered Cu + -[O v ] Ce 3+ interfacial sites induced by strong metal-support interaction (SMSI) within Ce 1-x Cu x O 2 solid solutions. In contrast, Cu-CeO 2 (S) and Cu-CeO 2 (C) display relatively lower maximum CO conversions (45.97 % at 410 °C and 43.7 % at 370 °C, respectively), due to excessive defect oxygen (34.41 % and 44.89 %) that strongly adsorbs reaction intermediates, postponing the WGS rate by 15–20 %. In-situ spectroscopy reveals that CeO 2 morphology modulates oxygen vacancy (O v ) distribution and Cu Ce interfacial structures, giving rise to distinct adsorption states and binding strengths of CO/CO 2 on Cu/CuO x nanoclusters with varied valence states and dispersions. Cu-CeO 2 (S) and Cu-CeO 2 (C) exhibit complex carbonation pathways, featuring dynamic evolution of intermediates from monodentate to bidentate to polymeric carbonates, attributed to surface site diversity and cross-interactions of Cu sites. This work elucidates the morphology-activity relationship of Cu-CeO 2 catalysts, providing insights for the rational design of highly active low-temperature WGS catalysts.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Bowen Zhang,Fei Cheng,Zeyu Sun,Kunpeng Xing,Bo Zhang,Saisai Zhang,Hari Bala,Yan Wang
Organic-inorganic hybrid perovskite materials have garnered significant research interest owing to their exceptional crystallographic characteristics and remarkable optoelectronic properties. This study presents a breakthrough in room-temperature ammonia sensing through the rational design of CH 3 NH 3 PbI 3 (MAPbI 3 )-based chemiresistive sensors modified with monoethanolamine (MEA) ligands. By integrating MEA as a coordination agent into the perovskite precursor solution, we achieved controlled crystallization dynamics, yielding compact MAPbI 3 films with unique maple-leaf grain morphology and enhanced humidity resistance. The optimized TiO 2 /MEA-MAPbI 3 sensor exhibited a nearly 2.1-fold improvement in response amplitude toward 100 ppm NH 3 compared to unmodified counterparts, alongside exceptional selectivity to NH 3 against interfering gases. Crucially, MEA-derived (PbI 2 )-MEA-(MAI) molecular shielding layers at grain boundaries suppressed moisture-induced degradation, enabling stable operation in air environment (∼30 %RH) with less than 22 % response degradation over 29 days. Mechanistic analyses revealed that the sensing behavior originates from reversible cation exchange between methylammonium (MA + ) and ammonium (NH 4 + ) species at the perovskite surface, corroborated by density functional theory (DFT) calculations showing preferential NH 3 adsorption over other analyte gases.
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CERAMICS INTERNATIONAL
·
2025
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IF 5.6
Hongtao Wang,Yuanchao Xie,Yang Liu,Yaodan Zhang,Jianan Ma,Jiaqi Yang
The enhanced sensitivity and selectivity of NO 2 gas sensors are crucial for atmospheric environmental monitoring. In this study, a novel NO 2 gas sensor based on small-sized ZIF-8/In 2 O 3 core-shell nanocube has been developed through a simple solvothermal method along with in situ modification. The ZIF-8 coating significantly increased the specific surface area of the In 2 O 3 nanocubes from 60.64 m 2 /g to 140.84 m 2 /g, while also boosting the adsorption of oxygen ions on the surface. Gas-sensing tests revealed that the ZIF-8/In 2 O 3 composites exhibited a response of 56.3 to 1 ppm of NO 2 , with an exceptionally low detection limit of 1 ppb. Notably, the sensor demonstrated outstanding selectivity for NO 2 over other potential interfering gases. The remarkable NO 2 sensing performance of the ZIF-8/In 2 O 3 composites can be attributed to the grain boundary effects in the In 2 O 3 nanocubes (with side lengths of approximately 40–50 nm), as well as the sensitizing and filtering effects of the ZIF-8 layer. This work holds significant promise for the rapid detection of low-concentration NO 2 gases in various applications.
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