CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Tongrui Shao,Liru Cao,Lin Li,Yang Su,Baolin Hou,Jian Lin,Xiaodong Wang
Water gas shift (WGS) reaction is an important process to remove CO contaminant in industrial hydrogen resources. The efficient catalyst that can work at low temperature is keenly desired to achieve high CO conversion from the viewpoint of thermodynamic equilibrium. Here, we develop a noble-metal-free catalyst of MoC nanorod (MoC NR) with the dominant (2 0 0) facet for the low-temperature WGS reaction. It exhibits a high performance with ∼ 100 % CO conversion at 175 °C, better than conventional MoC with the dominant (1 1 1) facet or the commercial Cu-based catalyst. Moreover, it shows rather better stability due to the presence of the dominant (2 0 0) facet. Various characterizations demonstrate that this facet facilitates MoC NR possessing higher removal capability of surface oxygen species to enhance the stability and lower activation energy to endow higher performance compared with conventional MoC. This study provides important implications for the rational design of cost-effective catalysts for the low-temperature WGS reaction.
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IEEE SENSORS JOURNAL
·
2025
·
IF 4.5
Jianxun Dai,Taisen Ye,Xuedong Zhan,Shancheng Han,Bin Ma,Hongyan Hai,Yanhong Liu,Pengcheng Tao,Dawei Li,Fengli Wang,Rong Han,Zhiguo Zhang,Yue Chen,Hao Zheng,Lili Geng,Rui Zhang,Huolin Huang
The analysis of human breath to detect both respiration state and breath biomarkers is of great importance in the fields of exhaled noninvasive breath monitoring and diagnosis. Thus, we have elaborately synthesized gallium oxide (Ga2O3) with different oxygen species as humidity and gas sensitive materials to monitor respiratory function and ammonia (NH3). In this work, the sensing characteristics and breath monitoring applications of the humidity/ammonia sensor based on the Ga2O3 are systematically investigated. The humidity sensor demonstrated high responsivity (over 3 orders of magnitude), low humidity hysteresis (1.83%) and good long-term stability. The ammonia sensor has a response of 1.2% to 2 ppm ammonia at 70% RH. To investigate the potential application of the sensor in detecting ammonia in exhaled gas, a simulated breath test was conducted.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Tian Yu,Qian Liu,Enkai Guo,Ning Qi,Feng Ren,Zhiquan Chen
Compositing metal organic framework (MOF) powder with a polymer substrate is an effective way to obtain an efficient gas separation membrane. However, the weak polymer–filler interaction usually leads to the formation of nonselective cracks in the composite material. Here, we report a MOF–polymer composite membrane with a continuous and dense MOF layer, which was synthesized by magnetron sputtering and vapor phase growth. A thermally rearranged poly(benzoxazole) (TR-PBO) membrane was converted from a hydroxy-polyimide precursor by a thermal rearrangement reaction, which was used as the polymer support of the composite membrane. An ultrathin ZnO seed layer was deposited on the TR-PBO support by magnetron sputtering technology, and then it was converted to a ZIF-8 layer by vapor phase growth. Scanning electron microscopy results confirm the formation of a dense, flat, and continuous ZIF layer with a thickness of about 450–600 nm. The ZIF-8 nanoparticles are uniform in size and evenly distributed. Furthermore, the attached ZIF layer significantly improves the gas selectivity of the composite membrane, which should be attributed to the sieving effect of the unique pore structure of ZIF-8. The method of magnetron sputtering combined with vapor phase growth is effective for improving the selectivity of the gas separation membrane and reducing the aggregation of MOF particles, which opens up a way for the design of flat and ultrathin gas separation composite membranes.
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CARBOHYDRATE POLYMERS
·
2025
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IF 12.5
Liyao Dai,Jinsheng Sun,Kaihe Lv,Fengbao Liu,Yingrui Bai,Bo Liao,Dongqing Yang,Chaozheng Liu,Mei-Chun Li
The development of oil and gas from fractured reservoirs is hindered by reservoir complexity, wellbore instability, lost circulation, and formation fluid intrusion during drilling. Various plugging materials and strategies have been employed; however, physical plugging materials often suffer from mismatched particle and fracture sizes, while chemical plugging materials face challenge with low plugging strength as well as tedious operation conditions. In addition, achieving both high plugging effectiveness during use and superior degradability after service remains a challenge. Supramolecular polymer gels, with their high strength and dynamic tunability, present a promising solution. This study reports the synthesis of a supramolecular polymer gel using acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, divinylbenzene, polyvinyl alcohol, and TEMPO-oxidized cellulose nanofibers (CNFs) through in situ radical polymerization. Due to the formation of covalent bonding and multiple hydrogen bonding, as well as the strong reinforcement and acid degradation capacity of CNFs, the supramolecular polymer gel demonstrates high compressive strength (0.69 MPa at a strain of 75 %), good thermal resistance (120 °C for 30 day), excellent plugging effect (> 11 MPa), and high degradation capacity (~ 94 wt%). This work provides new insights for developing high-strength, high-degradation supramolecular polymer gel as temporary plugging materials, promoting the development of oil and gas from fracturing reservoirs more efficiently and safely.
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PubMed
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
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IF 3.8
Zhanbo Guo,Chao Feng,Zongnan Shen,Xun Deng,Xinrong Feng,Min Deng,Jie Liu,Wenju Jiang,Lin Yang,Lu Yao,Zhongde Dai
Membranes have been considered as promising alternatives for natural gas sweetening. Mixed matrix membranes (MMMs) possess superior gas separation performance and the potential to combine varieties of polymers and filler materials. In the current work, MMMs have been fabricated via employing Tröger’s base (TB) polymer and zeolites with three different morphologies. Simultaneously, CO2/CH4 and H2/CH4 separation performances of the obtained MMMs were comprehensively investigated. It is found out that the presence of the MFI-type zeolites significantly improved the gas permeability, but the selectivity was somehow reduced. Among the three different nanofillers, nanosheet zeolite-based MMMs presented the highest gas permeability; with 20 wt % nanosheet zeolites, both CO2 and H2 permeabilities were increased to 348.6 and 441.5 Barrer, which were improved by 522.0 and 256.2%, respectively. In addition, SEM, XRD, FTIR, and TGA were also employed to characterize the obtained MMMs.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
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IF 11.3
Shuwen Peng,Yuran Li,Bin Wang,Yanbin Cui,Jinglei Tian,Hongqiang Liu,Tingyu Zhu
Removal of sulfur species from blast furnace gas is urgently needed due to the strict emission limits imposed on iron-steel industrial flue gas. Improving the sulfur capacity of H 2 S is a crucial challenge to reduce the operation cost. NiFe layered double hydroxide (LDH) adsorbents were synthesized using the hydrothermal method to strengthen the adsorption of H 2 S, achieving a high sulfur capacity of 133.6 mg/g at 50 °C. Characterization studies have revealed that the reaction pathway of H 2 S on the NiFe LDH surface involves adsorption, dissociation and oxidation. It has been clarified that the high sulfur capacity can be attributed to the abundant H 2 S dissociation sites and the excellent O 2 activation sites. The dissociation sites of H 2 S encompass metal sites, -OH and CO 3 2- . The interaction between O 2 and the bridge site of asymmetric metal atoms significantly enhances the dissociation of O 2 . Strengthening the dissociation of H 2 S and O 2 improves the sulfur capacity. The deactivation of adsorbents comes from the continuous consumption of oxygen species mainly composed of -OH and the deposition of sulfur species in the smaller mesopores ranging from 2 to 10 nm. This work provides useful insights into designing highly efficient iron-based adsorbents for the desulfurization of blast furnace gas.
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Nanomaterials
·
2025
·Vol. 15
·期 4
·279
·
IF 4.3
Yuning Li,Xinya Wang,Weiqiu Huang,Xufei Li,Ping Xia,Xiaochi Xu,Fangrui Feng
Membrane technology has been widely used in industrial CO2capturing, gas purification and gas separation, arousing attention due to its advantages of high efficiency, energy saving and environmental protection. In the context of reducing global carbon emissions and combating climate change, it is particularly important to capture and separate greenhouse gasses such as CO2. Zr-MOF can be used as a multi-dimensional modification on the polymer membrane to prepare self-assembled MOF-based mixed matrix membranes (MMMs), aiming at the problem of weak adhesion or bonding force between the separation layer and the porous carrier. When defective UiO-66 is applied to PVDF membrane as a functional layer, the CO2separation performance of the PVDF membrane is significantly improved. TUT-UiO-3-TTN@PVDF has a CO2permeation flux of 14,294 GPU and a selectivity of 27 for CO2/N2and 18 for CO2/CH4, respectively. The CO2permeability and selectivity of the membrane exhibited change after 40 h of continuous operation, significantly improving the gas separation performance and showing exceptional stability for large-scale applications.
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ACS Nano
·
2024
·
IF 15.8
Shuang Liu,Ying Wang,Taoli Jiang,Song Jin,Muhammad Sajid,Zuodong Zhang,Jingwen Xu,Yanpeng Fan,Xiaoyang Wang,Jinghao Chen,Zaichun Liu,Xinhua Zheng,Kai Zhang,Qingshun Nian,Zhengxin Zhu,Qia Peng,Touqeer Ahmad,Ke Li,Wei Chen
The development of efficient, stable, and low-cost bifunctional catalysts for the hydrogen evolution/oxidation reaction (HER/HOR) is critical to promote the application of hydrogen gas batteries in large scale energy storage systems. Here we demonstrate a non-noble metal high-entropy alloy grown on Cu foam (NNM-HEA@CF) as a self-supported catalytic electrode for nickel-hydrogen gas (Ni-H2) batteries. Experimental and theoretical calculation results reveal that the NNM-HEA catalyst greatly facilitates the HER/HOR catalytic process through the optimized electronic structures of the active sites. The assembled Ni-H2 battery with NNM-HEA@CF as the anode shows excellent rate capability and exceptional cycling performance of over 1800 h without capacity decay at an areal capacity of 15 mAh cm–2. Furthermore, a scaled-up Ni-H2 battery fabricated with an extended capacity of 0.45 Ah exhibits a high cell-level energy density of ∼109.3 Wh kg–1. Moreover, its estimated cost reaches as low as ∼107.8 $ kWh–1 based on all key components of electrodes, separator and electrolyte, which is reduced by more than 6 times compared to that of the commercial Pt/C-based Ni-H2 battery. This work provides an approach to develop high-efficiency non-noble metal-based bifunctional catalysts for hydrogen batteries in large-scale energy storage applications.
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International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 4
·964-972
·
IF 7.2
Han Dan,Liu Xiaoru,Li Donghui,Shi Jiexu,Wang Yu,Wang Yuxuan,Wang Hongtao,Sang Shengbo
In this work, we realized a room-temperature nitrogen dioxide (NO 2 ) gas sensor based on a platinum (Pt)-loaded nanoporous gallium nitride (NP-GaN) sensing material using the thermal reduction method and coreduction with the catalysis of polyols. The gas sensor gained excellent sensitivity to NO 2 at a concentration range of 200 ppm to 100 ppb, benefiting from the loading of Pt nanoparticles, and exhibited a short response time (22 s) and recovery time (170 s) to 100 ppm of NO 2 at room temperature with excellent selectivity to NO 2 compared with other gases. This phenomenon was attributed to the spillover effect and the synergic electronic interaction with semiconductor materials of Pt, which not only provided more electrons for the adsorption of NO 2 molecules but also occupied effective sites, causing poor sites for other gases. The low detection limit of Pt/NP-GaN was 100 ppb, and the gas sensor still had a fast response 70 d after fabrication. Besides, the gas-sensing mechanism of the gas sensor was further elaborated to determine the reason leading to its improved properties. The significant spillover impact and oxygen dissociation of Pt provided advantages to its synergic electronic interaction with semiconductor materials, leading to the improvement of the gas properties of gas sensors.
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ACS Nano
·
2024
·
IF 15.8
Binbin Chu,Zhiming Chen,Xiaofeng Wu,Haoliang Shi,Xiangbowen Jin,Bin Song,Mingyue Cui,Yadan Zhao,Yingying Zhao,Yao He,Houyu Wang,Fenglin Dong
To date, long-term and continuous ultrasonic imaging for guiding the puncture biopsy remains a challenge. In order to address this issue, a multimodality imaging and therapeutic method was developed in the present study to facilitate long-term ultrasonic and fluorescence imaging-guided precision diagnosis and combined therapy of tumors. In this regard, certain types of photoactivated gas-generating nanocontrast agents (PGNAs), capable of exhibiting both ultrasonic and fluorescence imaging ability along with photothermal and sonodynamic function, were designed and fabricated. The advantages of these fabricated PGNAs were then utilized against tumors in vivo, and high therapeutic efficacy was achieved through long-term ultrasonic imaging-guided treatment. In particular, the as-prepared multifunctional PGNAs were applied successfully for the fluorescence-based determination of patient tumor samples collected through puncture biopsy in clinics, and superior performance was observed compared to the clinically used SonoVue contrast agents that are incapable of specifically distinguishing the tumor in ex vivo tissues.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Hang Liu,Junlong Liu,Yanchang Liu,Zhihao Qu,Siye Tian,Yuhong Zhang
In this work, the ZnO microsphere is prepared by hydrothermal method and modified with different concentrations of Eu. The morphology of ZnO:Eu sample shows flower-like microspheres with many nanosheets. The gas performance of ZnO:Eu microsphere is investigated for detecting NO 2 . Compared with pure ZnO, the response of ZnO:2 % Eu sensor is increased by 8 times, and the optimal operating temperature of that is decreased to 130 °C. Especially, the gas sensing properties of ZnO:2 % Eu sensor is enhanced under UV excitation. The recovery time of ZnO:Eu sensor is reduced by 1200 s, and the response is increased by 3.6 times under UV excitation. The above results show an increase in sensor response due to doping Eu and UV excitation. At last, the possible gas mechanism of ZnO:Eu is discussed with and without UV excitation. This finding provides important guidance for UV-assisted sensors to enhance NO 2 response.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Jiang Haotian,Zhang Jie,Wei Li
Superior gas sensing properties may be obtained by forming suitable metal/semiconductor nanocomposites. In this work, gold (Au) was utilized to form composite nanofibers with tin oxide (SnO 2 ) to detect nitric oxide (NO) gas. Au/SnO 2 composite nanofibers were synthesized through a facile electrospinning and annealing treatment. Various techniques, including XRD, SEM, TEM, UV–vis, XPS, and BET, were used to characterize these Au/SnO 2 heterostructures. The characterization results demonstrate that Au exists in the form of metallic clusters even at an extremely low concentration of 0.1 at% and, it can provide more active sites and chemisorbed oxygen species due to its spillover effect. The gas sensing results show that the Au/SnO 2 composite nanofibers exhibit excellent sensing performance to NO at 130 °C. Specifically, the composite nanofiber with 0.1 at% Au shows an ultrahigh response of 183 (resistance ratio) to 100 ppb NO gas at 130 °C. The sensor exhibits good selectivity, repeatability, and long-term stability. These remarkable sensing properties indicate that Au/SnO 2 composite nanofibers have promising applications to some demanding fields such as detecting NO from human exhaled breath.
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