FUEL
·
2023
·
IF 7.4
Wei Zheng,Zequn Yang,Jiefeng Chen,Weizhen He,Ruiyang Qin,Hongxiao Zu,Wenqi Qu,Jianping Yang,Lijian Leng,Hailong Li
A fundamental obstacle that restricts the use of metal selenides for gaseous elemental mercury (Hg 0 ) immobilization is the failure to take both the optimization of intrinsic structure favorable for Hg 0 diffusion and adequate exposure of metal selenide towards Hg 0 into consideration. In this work, a Ti 3 C 2 MXene/Cu 2 Se sorbent for Hg 0 sequestration was synthesized via a Lewis acid etching route combined with room-temperature selenization pathway. During this strategy, copper chloride plays a dual role, i.e., an etching agent for the Ti 3 C 2 MXene synthesis and a precursor for Cu 0 decoration. Cu 2 Se precursors (Cu 0 ) were dispersedly and firmly pre-anchored on the substrate, effectively avoiding the agglomeration and warranting excellent dispersion of Cu 2 Se. Compared with pristine Cu 2 Se, Ti 3 C 2 MXene/Cu 2 Se exhibits advantageous structural characteristics fully boosting Hg 0 diffusion kinetics. Meanwhile, the enhanced dispersion of Cu 2 Se from the prefixation of Cu 0 largely enhances the exposure and utilization of selenide. Consequently, Ti 3 C 2 MXene/Cu 2 Se shows a Hg 0 adsorption capacity of 147.64 mg g −1 , which is much higher than those of Cu 2 Se and most other metal selenides. Impressively, its uptake rate of 688.99 μg g −1 min −1 is the highest record rate in metal selenides. Moreover, Ti 3 C 2 MXene/Cu 2 Se still maintained outstanding Hg 0 adsorption performance under relatively high reaction temperature with the shelter of Ti 3 C 2 MXene. Typical fuel gas situations including coal combustion flue gas, smelting flue gas, natural gas have negligible influences on its Hg 0 adsorption performance, indicating its extensive applicability and flexibility for actual industrial situations. This work also provides valuable hints for the trade-off of structural properties and ligands exposure to design Hg 0 sorbents with satisfactory Hg 0 sequestration performances.
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 20
·9887-9893
·
IF 3.3
Yao Tang,Zijun Zou,Xingen Wu,Pengfei Zuo,Lei Wang,Guiwen Huang,Jia Zhu,Shengliang Zhong
Designing highly efficient non-precious metal electrocatalysts to facilitate overall water decomposition is critical and highly desirable, but still challenging. In this study, we synthesized ZIF-67@POM nanomaterials by doping H3PMo12O40 in ZIF-67. The molybdenum-doped carbon matrix can effectively reduce CoP agglomeration, which is conducive to improving the specific surface area and active sites of the catalyst. The doping of Mo also optimizes the electronic structure of Mo-CoP-100 and improves its electrocatalytic activity. Compared with CoP derived from pristine ZIF-67, the optimal Mo-CoP-100 exhibits significantly enhanced oxygen evolution reaction (OER) catalytic activity with an almost constant overpotential of 290 mV to maintain a stable current density of 10 mA cm−2 in alkaline media for at least 100 h. Furthermore, compared with traditional precious metal-free OER electrocatalysts, the Mo-CoP catalysts prepared in this work have high specific surface area, rich surface-active sites, good cycling stability and high diffusion efficiency.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xuyang Li,Yingke Zhang,Shuyi Li,Xiaojing Xing,Xinfeng Cheng,Lin Wang,Xianchao Du,Shuai Li,Dongfang Qiu,Meng Guo
Mixed-matrix membranes (MMMs) show great potential for application in hydrogen separation study. However, the MMMs prepared by the traditional strategy have the imperfect compatibility of the matrix and fillers, and the non-ideal microstructure, undergoing a trade-off between permeability and selectivity. Herein, we report a new in-situ limited filling method to improve the H 2 /CH 4 separation performance of the maleic anhydride grafted polypropylene (MAPP) membranes medicated by a series of cyclodextrins (CDs). The introduction of CDs can better loosen the MAPP microstructure and ensure that the nanocomposite membranes have excellent H 2 permeabilities. The two-time limited filling can further compensate for the microvoids or defects in the membrane microstructure, thereby improving the H 2 /CH 4 separation stability of the nanocomposite membranes. The H 2 /CH 4 selectivities of the α-CD/MAPP, β-CD/MAPP, MEDβCD/MAPP, and γ-CD/MAPP are 7.1, 5.7, 6.3, and 5.1 times higher than that of pure MAPP membrane, respectively. This work provides a straightforward and effective strategy to fabricate homogeneous MMMs for gas separation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Zang Shuaipu,Zhang Xuhui,Sun Yingying,Li Ning,Wang Lei,Li Lin Song
Harnessing environment-friendly and low-cost multinary Cu-In-Zn-S quantum dots (QDs) as emitters for light-emitting diodes (LEDs) has attracted great attention for display and lighting application. However, suboptimal QD structure is a huge obstacle, which results in serious non-radiative recombination and efficiency roll-off. Herein, we synthesized structure-tailored Cu-In-Zn-S/ZnS//ZnS QDs by improving the reactivity of shell growth by 2-ethylhexanoic acid (EHA) ligands. The EHA-assisted shell growth can boost an extended alloyed layer at the core-shell interface and a smoothed confinement barrier, which effectively passivate the interface defects and suppress Förster resonance energy transfer (FRET) process. These synthesized QDs display a bright photoluminescence emission (quantum yield of 83%) and a larger size of 8.4 nm. Moreover, the resulting LEDs based on the EHA-assisted QDs exhibit a maximum luminance of 8074 cd/m2, and a current efficiency of 7.3 cd/A with a low efficiency roll-off. Our results highlight a remarkable ligand strategy to tailor the QD structure for high performance QD-based LEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hongyuan Chuai,Haibei Yang,Sheng Zhang
Ni single-atom-decorated nitrogen-doped carbon materials (Ni–Nx-C) have demonstrated high efficiency in the electrochemical reduction of CO2 (CO2RR) to CO. In this study, Ni–Nx-C active sites were embedded within a carbon membrane via an electrospinning and pyrolysis process. The resulting self-supported carbon membrane hosting Ni–Nx-C sites could be directly utilized as an electrode for the CO2RR. To enhance the CO2RR performance of the carbon membrane, the porous structure of the carbon membrane was fine-tuned by incorporating a pore-forming agent. The optimized porous carbon membrane electrode, K0.66-Ni-NC, achieved an impressive CO faradaic efficiency (FECO) of over 90% within a wide potential range from −0.8 to −1.6 V vs RHE for CO2RR. Additionally, it maintained an FECO of above 90% at −0.8 V vs RHE throughout a 30 h durability test in an H-cell. Further analysis has revealed that the porous structure of the carbon membrane not only facilitates the mass transport of CO2 but also increases the level of exposure of active sites during the CO2RR.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemMedChem
·
2013
·Vol. 9
·期 1
·207-216
·
IF 2.835
Hong Liu,Liang Wang,Yan Li,Jiang Liu,Maomao An,Shaolong Zhu,Yongbing Cao,Zhihui Jiang,Mingzhu Zhao,Zhan Cai,Li Dai,Tingjunhong Ni,Wei Liu,Simin Chen,Changqing Wei,Chengxu Zang,Shujuan Tian,Jingyu Yang,Chunfu Wu,Dazhi Zhang,Hua Liu,Yuanying Jiang
Graphical Build it better: Structural optimization of berberine led to the identification of the novel scaffold of N -(2-(benzo[ d ][1,3]dioxol-5-yl)ethyl)-2-(substituted phenyl)acetamides 7 a – l , which exhibited remarkable in vitro synergistic antifungal activity against fluconazole-resistant Candida albicans in combination with fluconazole. Compound 7 d exhibited much lower cytotoxicity than berberine toward human umbilical vein endothelial cells. We have conducted systematic structural modification, deconstruction, and reconstruction of the berberine core with the aim of lowering its cytotoxicity, investigating its pharmacophore, and ultimately, seeking novel synergistic agents to restore the effectiveness of fluconazole against fluconazole-resistant Candida albicans. A structure–activity relationship study of 95 analogues led us to identify the novel scaffold of N -(2-(benzo[ d ][1,3]dioxol-5-yl)ethyl)-2-(substituted phenyl)acetamides 7 a – l , which exhibited remarkable levels of in vitro synergistic antifungal activity. Compound 7 d ( N -(2-(benzo[ d ][1,3]dioxol-5-yl)ethyl)-2-(2-fluorophenyl)acetamide) significantly decreased the MIC 80 values of fluconazole from 128.0 μg mL −1 to 0.5 μg mL −1 against fluconazole-resistant C. albicans and exhibited much lower levels of cytotoxicity than berberine toward human umbilical vein endothelial cells.
研究领域:
药理学
·
抗感染研究
·
药物化学
✓ 已验证
DOI
PubMed
高影响因子
Carbon Capture Science & Technology
·
2023
·
IF 0
Chaoqi Ge,Menglong Sheng,Ye Yuan,Fei Shi,Yi Yang,Song Zhao,Jixiao Wang,Zhi Wang
Mixed matrix composite membranes (MMCMs) are considered as one of the potential directions for the development of CO 2 capture membranes. Nevertheless, the high cost and the challenging nature of improving separation performance are significant obstacles that prevent MMCMs from being widely applied in practice. In this study, we developed a cost-effective modified pore-optimized MOF-808 (MOF-808@PVAm) and utilized it to fabricate high-performance CO 2 capture MMCMs. Specifically, MOF-808 and polyvinylamine (PVAm) were cross-linked by γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH-560), which improved the pore structure characteristics of MOF-808 and led to high-performance MMCMs. For 2 bar feed gas (CO 2 /N 2 , 15/85), the MMCM with 33.33 wt.% MOF-808@PVAm loading displayed remarkable CO 2 permeance of 2753 GPU and selectivity of 181. The prepared MMCM demonstrated good operational stability in simulated flue gas and exhibited potential for application in various gas purification fields (CO 2 /CH 4 , CO 2 /H 2 ) through gas permeation tests.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Haozhang Xu,Guoan Xi,Wei Chen,Yin Hu,Jun Xia,Weiguo Song,Changyan Cao,Yanhong Zeng,Dan Zhou
The development of hydrogenation catalysts with high performance and stability could decrease the byproducts and simplify the follow-up process in the industrial process. Optimizing supported catalysts through support improvement is a feasible approach to balance effectiveness and cost. In view of this, cubic perovskite NaNbO3 was modified with organosiloxane to form a heterophase junction support consisting of amorphous silica and NaNbO3 crystal. On the basis of this, the supported Ru catalyst displayed superior performance for α-pinene hydrogenation with almost complete conversion, cis-pinane selectivity, and good stability. The relationship between the structure and performance of the catalyst was systematically investigated by comprehensive experiments and multiple characterization technologies. Due to the formation of the heterophase junction, the surface hydrophobicity, specific surface area, and electron properties of the catalyst were optimized, leading to the good dispersity of the catalyst in the hydrogenation mixture and excellent adsorption and charge transfer ability, which should account for the unique performance of the catalyst, as confirmed by a series of experiments, characterizations, and DFT calculations. This work proposes an effective approach to optimize the surface structure and electronic properties of the catalysts through constructing crystallized and amorphous heterophase junction support, which is theoretically significant for the design and development of cost-effective heterogeneous hydrogenation catalysts.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOM
·
2025
·
IF 2.3
Wu Shijie,Gu Haiquan,Chen Zhimin,Jia Jun,Sun Liang,Li Yafeng
Nitrogen- and oxygen-doped high specific surfaces of activated carbon with an optimized pore system have been obtained by the method of calcination at 1000°C, using ZIF-8 as the precursor. The ZnCl 2 is as the activating agent, which is reduced to Zn 0 by the carbon in the precursor. And the specific surface area of activated carbon can reach up to 2569 m 2 g −1 . This is comparable to the specific surface area of activated carbon produced with KOH as the activating agent. The N 2 isothermal adsorption–desorption at 77 K indicates that the specific surface area of N-doped super-activated carbon increases a little to 2838 m 2 g −1 , when the urea has been incorporated into the precursor as extra an nitrogen source. Interaction between N- and O-doped carbon and K + ions in KOH is illustrated by the corresponding density function theory (DFT), and the electron cloud between K and the carbon material is simulated. The electrochemical measurements were conducted in 6 M KOH and 1 M Na 2 SO 4 , which confirms that nitrogen and oxygen doping has a significant increase in specific capacitance. The super-activated carbon with an optimized pore system possesses excellent electrochemical performance, which shows good application prospects for energy storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Xinhui Zhang,Aiping Wu,Dongxu Wang,Ying Xie,Aleksandr I. Gubanov,Gennadiy A. Kostin,Chungui Tian
The bi-transition-metal interstitial compounds (BTMICs) are promising for water electrolysis. The previous BTMICs are usually composed of irregular particles. Here, this work shows the synthesis of novel 1D Co 6 Mo 6 C-based heterojunction nanowires (1D Co/Co 6 Mo 6 C) with diameters about 50 nm and a length-to-diameter ratio about 20 for efficient water electrolysis. An interesting growth process based on pyrolytically “squeezing” PMo 12 (Phosphomolybdic acid)/ZIF-67 (Zeolitic Imidazolate Framework-67) cube precursor is demonstrated. The “squeezing” growth is related to the role of Mo species for isolating Co species. A series of tests and theoretical calculation show the mutual regulation of Co and Mo to optimize the electronic structure, accelerating H 2 O dissociation and the reduction kinetics of H + . Additionally, the nanowires provide pathways for electron transfer and the transmission of reactants. Consequently, the 1D Co/Co 6 Mo 6 C exhibits high activity for hydrogen evolution reaction ( η 10 of 31 mV) and oxygen evolution reaction ( η 10 of 210 mV) in 1 m KOH. The electrolytic cell based on 1D Co/Co 6 Mo 6 C requires a low voltage of 1.43 V to drive 10 mA cm −2 . The catalyst also exhibits good HER performance in 1 m phosphate-buffered saline solution, exceeding Pt/C at a current density >42 mA cm −2 .
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Shengqin Guan,Baoen Xu,Xingbo Yu,Yonghong Ye,Yuting Liu,Taotao Guan,Yu Yang,Jiali Gao,Kaixi Li,Jianlong Wang
High-entropy oxides (HEOs) are potential electrocatalysts for overcoming the sluggish kinetics of the oxygen evolution reaction (OER). Conventionally, the thermodynamic barrier of the lattice oxygen mechanism (LOM) is lower than that of the adsorbate evolution mechanism (AEM). However, controlling the transition from the AEM to the LOM remains challenging. Herein, an in situ modulation strategy has been developed to synthesize N-FeCoNiAlMoOx by introducing structural directing agents and electronic modulators. Different instruments were used to identify the nitridation-triggered micromorphologies and phase transformations. X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure spectroscopy (XAFS) reveal the optimized electronic structures after nitrogen doping. N-FeCoNiAlMox exhibits OER performance with low overpotentials of 240 and 285 mV at 10 and 100 mA·cm–2, respectively. pH dependence, free-radical capture experiments, and density functional theory (DFT) calculations confirm that nitrogen doping facilitates the LOM pathway. This work elucidates nitrogen’s critical role and the LOM pathway’s contribution to efficient OER performance.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Sustainable Cement-Based Materials
·
2025
·
IF 4.2
Fengjuan Wang,Haotian Liu,Xiaozhu Wang,Jinyan Shi,Yang Xu,Jinyang Jiang
The incorporation of polymers in Portland cement-based materials demonstrates remarkable potential for increasing flexural strength and toughness, but faces a critical challenge of compressive strength significant reduction caused by inhomogeneous polymer distribution. To address this bottleneck, this study developed polyacrylamide-cement (PAMC) composite materials through an innovative in-situ polymerization strategy of acrylamide (AM) monomers. This study systematically investigationd the mechanical properties of PAMC with varying AM dosages (1–5%), revealing an optimal AM content achieving 89.6% enhancement in 7-d flexural strength while maintaining 91.7% retention of compressive strength. Multi-scale characterization combining FTIR spectroscopy, XRD analysis, and TG-DSC measurements elucidated the phase evolution and hydration modification mechanisms during PAMC formation. SEM observation and MIP analysis elucidated the dual mechanism involving both polymer network structure enhancement and pore structure refinement. This work establishes fundamental correlations between polymerization-controlled microstructure optimization and macroscopic performance enhancement, providing new insights for developing high-performance cement composites.
研究领域:
土木工程
·
材料科学
✓ 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）