RARE METALS
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2024
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IF 9.6
Li Zhao-Yang,Zhao Wei-Jun,Sun Yu,Zhou Bing,Feng Yue-Zhan,Liu Chun-Tai
The pressing demand for ultrathin and flexible shields to counter electromagnetic interference (EMI) has sparked interest in Ti 3 C 2 T x MXene materials due to their exceptional electrical conductivity, tunable surface chemistry, and layered structure. However, pure Ti 3 C 2 T x MXene films often lack the mechanical properties required for practical engineering applications, and traditional reinforcement methods tend to reduce electrical conductivity. This work demonstrates an effective strategy to enhance the alignment and densely packed layered structure of Ti 3 C 2 T x MXene films by regulating the acidity and alkalinity of Ti 3 C 2 T x MXene aqueous solutions. This approach simultaneously improves mechanical strength and electromagnetic interference shielding effectiveness (EMI SE). Compared with original Ti 3 C 2 T x MXene films, MXene films modified with ammonia solution (NH 3 ·H 2 O) via OH − show a significant improvement in tensile strength (27.7 ± 1.9 MPa). Meanwhile, MXene films treated with hydrochloric acid (HCl) via H + reach an even higher tensile strength of 39 ± 1.5 MPa. Moreover, the EMI SE values of the treated MXene films increase significantly, each reaching 66.2 and 58.4 dB. The maximum improvements in EMI SE values for the acid- and alkali-treated samples are 17.9% and 4%, respectively. In conclusion, the simultaneous enhancement of mechanical strength and EMI shielding efficacy highlights the potential of acid- and alkali-treated Ti 3 C 2 T x MXene films for applications in ultrathin and flexible EMI shielding materials. Graphical abstract
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FUEL
·
2024
·
IF 6.7
Jun Zhang,Shuyue Liu,Shiyu Lu,Chunyuan Wang,Pingjuan Liang,Huan Yi,Mengjie Li,Laizheng Luo,Rong Wang,Guangming Jiang
Improving the utilization of hydrogen radicals (H*) is of great significance for effective Pd-mediated electrocatalytic hydrodechlorination (EHDC) in detoxifying chlorinated organic pollutants (COPs). However, the limited H* utilization by single Pd arises from its inadequate performance in adsorbing/activating COPs and inferior mass transfer of low-concentration COPs. In this study, an urchin-like yolk/shell TiO 2 spheres with mesoporous structure are developed for supporting Pd nanoparticles (Pd/U-TiO 2 ), which exhibits superior EHDC activity and selectivity for 2,4-DCP reduction. Notably, the prepared Pd/U-TiO 2 catalyst achieves a mass activity of 4.2 min −1 g Pd -1 and a specific activity of 1.94 min −1 mol Pd -1 when detoxifying 50 mg/L of 2,4-DCP at −0.85 V, surpassing the most reported catalysts. Furthermore, the Pd/U-TiO 2 catalyst consistently demonstrates higher H* utilization efficiency compared to single Pd, regardless of the 2,4-DCP concentration or reaction mode (batch or continuous-flow). This enhanced H* utilization efficiency is attributed to two key factors: the urchin-like and yolk/shell structure of U-TiO 2 enhances the mass diffusion of 2,4-DCP, and the strong interactions between Pd and U-TiO 2 generate electron-rich Pd species that enhance the adsorption and activation of COPs. Overall, this work highlights the synergistic effects of strong metal-support interactions and mass diffusion in enhancing atomic H* utilization. This study lays a significant experimental and theoretical foundation for designing efficient electrocatalysts for the detoxification of chlorinated organic pollutants and various other halogenated organic pollutants.
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JOURNAL OF PHYSICAL ORGANIC CHEMISTRY
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2012
·Vol. 26
·期 1
·23-29
·
IF 1.963
Chang-Di Chen,Wen-Bing Sheng,Guo-Jun Shi,Can-Cheng Guo
The regioselective hydroxylation of the aromatic C–H bond on a series of naphthalenes with different β-substituent R (R = H, Me, Et, i -Pr, OMe, COOH, Br, etc.) was studied, and the substituent effect on the regioselectivity was investigated. The electron-donating substituent afforded the aromatic C–H bond hydroxylation at the 1α position with more than 80% selectivity, while the electron-withdrawing substituent afforded the aromatic C–H bond hydroxylation at the 4α position with more than 60% selectivity of β-substituted naphthalene hydroxylated with metachloroperbenzoic acid catalyzed by tetrakis(pentafluorophenyl)porphyrin manganese(III) chloride. The research showed that the steric and electronic effects of the substituent appeared to play a significant role in determining the regioselectivity, and the electronic effect was of more importance than the steric effect of the substituent in the current situation. The studies may provide additional proofs for the stepwise mechanism of the aromatic C–H bond hydroxylation through a cationic intermediate. Copyright © 2012 John Wiley & Sons, Ltd.
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MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Yu Chang,Jianan Zhang,Ivan S. Babichuk,Hailong Liu,Yijie Liu,Jian Yang
The release of ammonia (NH 3 ) in industry or daily life is harmful to human health. A gas sensor was developed using h -MoO 3 nanorods and graphene film to detect and eliminate this. The h -MoO 3 nanorods were first synthesized by chemical bath deposition using ammonium molybdate tetrahydrate (NH 4 ) 6 Mo 7 O 24 •4H 2 O and HNO 3 and then deposited on the graphene film transferred to SiO 2 /Si substrate by electrochemical bubbling method. Subsequently, gas-sensitive h -MoO 3 @Graphene composite films were prepared and analyzed using Raman, XRD, SEM, and UV–vis. The gas sensor's performance was evaluated to detect NH 3 at a room temperature concentration range of 1–60 ppm. Compared with graphene, the conductivity of the composite film with 10 mg/ml h -MoO 3 nanorods was increased by 40 % and the sensitivity increased by 10 times. The sensor h -MoO 3 @G-10 showed the best sensing performance to 1 ppm NH 3 . Sensor sensitivity, response and recovery time are 1.1 %, 46.8 s and 17.8 s.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yu Gu,Zhiqiang Tao,Shujia Zhang,Xiaohui Wang,Hao Yan,Xinmei Liu,Lei Wang,Jun Xu,Hui Shi
Methane–propane coaromatization (MPCA) upgrades two abundant and inexpensive light alkanes into value-added aromatic products. While Ga-loaded MFI zeolites represent by far the most promising catalysts for MPCA reaction, they often contain a sizable portion of Ga species at the external surface of zeolites, which are remote from the Brønsted acid sites (BAS) within MFI pores and thus inefficient for MPCA. Here, we show that Ga can be introduced into MFI pores at fairly high loadings via a simple cocrystallization approach, yielding catalysts possessing well-dispersed Ga sites predominantly residing inside the pores and framework. Adjacency between Ga and BAS within the constraints of MFI channels makes these (Ga, Al)-H-MFI catalysts more active toward methane and propane activation and more selective toward aromatics compared to the Ga/MFI counterparts prepared by impregnation that inevitably leaves a large fraction of Ga at the external surface (i.e., without confinement and few adjacent BAS). Further, the effects of the Si/Al ratio on MPCA performance have been investigated for (Ga, Al)-H-MFI catalysts. Due to the multifold roles of BAS in the overall reaction sequence, an increased BAS concentration generally results in higher propane conversion and productivity of aromatics together with lower net methane conversion and severer coking.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Zhichao Ma,Chenyi Wang,Tianfang Yang,Gangya Wei,Jinrui Huang,Mengran Liu,Kun Zhang,Zunjie Zhang,Yang Liu,Shuyan Gao
Electrocatalytic nitrate (NO3−) reduction to ammonia (NH3) (NRA) is of great significance for solving the problem of urgent NO3− pollution in the environment and opening up a new route to synthesize NH3. However, NRA is limited by its multi-electron/proton transfer process and the NRA process relies heavily on atomic H* produced by H2O splitting, undergirding the necessity for effective NRA catalysts. Herein, three-dimensional (3D) porous phosphorus (P)-doped Cu–Ni alloy materials are constructed through a one-step electrodeposition synthesis. 3D porous materials modulate hydrophilicity and enrich active sites. The Cu d-band center can be tuned through Ni alloying to modify the adsorption energies of intermediates such as *NO3−, *NO2−, and *NH2. The hydrogenation evolution capacity of P promotes the hydrogenation process in the atomic H* path and effectively accelerates the NRA reaction rate. Density functional theory (DFT) calculations demonstrate that the charge transfer between the negatively charged Pδ− and the positively charged Niδ+ and Cuδ+ assists in generating more atomic H* for coupling with reaction intermediates, showing an enhanced catalytic activity at low overpotential. The optimal sample exhibits an exceptional NRA performance with an ammonia yield rate of 848.1 μmol h−1 cm−2 and a faradaic efficiency of 96.1%. This work provides a strategy for creating effective NRA catalysts through enhancing the atomic H* reduction strategy.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Chuanling Sun,Dajiang Mei,Jingli Xu,Yuandong Wu
Two new mixed bismuth (III) tellurite nitrate/sulfate, H[Bi 3 O(Te 3 O 9 )](NO 3 ) 2 and [Bi 2 (TeO 3 ) 2 ](SO 4 ) were synthesized under hydrothermal conditions. H[Bi 3 O(Te 3 O 9 )](NO 3 ) 2 crystallizes in the hexagonal space group P 6 ¯ 2 m (No. 189) with lattice parameters a = 9.8465(4), b = 9.8465(4), c = 4.1917(4) Å, V = 351.95(4) Å 3 , Z = 1, while [Bi 2 (TeO 3 ) 2 ](SO 4 ) crystallizes in the monoclinic space group C 2/ c (No. 15) with lattice parameters a = 15.7657(13), b = 7.4285(5), c = 8.0959(6) Å, β = 112.693(2) ° , V = 874.75(11) Å 3 , Z = 4. The structure of H[Bi 3 O(Te 3 O 9 )](NO 3 ) 2 features one-dimensional cationic 1 ∞ [Bi 3 O(Te 3 O 9 )] + chains along c axis, which are composed of [BiO 7 ] and [TeO 4 ] polyhedra by sharing corners and edges, whereas [Bi 2 (TeO 3 ) 2 ](SO 4 ) possesses a new three-dimensional framework consisting of two-dimensional zigzag layers of 2 ∞ [Bi 2 (TeO 3 ) 2 ] 2+ that are linked by SO 4 2- anions. Title compounds were characterized by single-crystal X-ray diffraction, powder X-ray diffraction, Raman spectra, infrared spectra and solid state UV-vis-NIR diffuse reflectance spectroscopy .
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shuangxi Lin,Longchen Gong,Ning Zhao,Huibo Zhao,Feigang Zhao,Yang Bai,Zhenhua Li,Wen Liu
Modulating metal-support interactions is critical for improving catalytic activity and product selectivity for CO 2 hydrogenation. Such modulation can be achieved by modifying the metal nanoparticles as well as the supports. Here, we prepared a novel catalyst, in which Ni nanoparticles were dispersed on CeO 2 and hexagonal boron nitride (h-BN) hybrid supports. The introduction of h-BN to Ni/CeO 2 -BN effectively improves the dispersion of Ni nanoparticles. More importantly, the abundant Ni-CeO 2 interfacial sites with enriched oxygen vacancies are formed over h-BN edge sites. The dispersed Ni species are anchored on CeO 2 via a unique interfacial structure, with electron-rich Ni (Ni δ− ) species. At the interfacial sites on Ni/CeO 2 -BN, the synergy between oxygen vacancies and Ni δ− , which enhances CO 2 activation and H 2 dissociation, respectively, renders superior catalytic performance for CO 2 methanation. In situ DRIFTS suggests formate as key rate-limiting intermediates on Ni-CeO 2 sites, while the formation of B-H bonds further promotes hydrogen activation and subsequently the catalytic performance. The modulation of metal-support interactions by spatial confinement effect by BN offers a new paradigm for designing metal/oxide catalysts for chemical transformations that requires bifunctionality as CO 2 hydrogenation.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Jianfeng Hu,Jianbin He,Yanping He,Xiaoming Fang,Zhengguo Zhang
Encapsulated phase change materials (MPCMs) can be used to address thermal runaway issues in electronic devices and battery systems in small spaces or flexible requirements. In this work, polyurea microcapsules incorporating h-BN and encapsulating n-eicosane were successfully synthesized. The h-BN was embedded to enhance the microcapsules' thermal conductivity. Comprehensive characterizations revealed that the microcapsules' area change rates before and after phase transition were approximately 3 %. Among the various microcapsules, h/MC-2 exhibited the best performance, with an enthalpy value of 184.37 J/g, an encapsulation efficiency of 79.72 %, and a high thermal storage efficiency of up to 99 %. Moreover, the thermal conductivity coefficient increased by 51.24 % to 0.3297 W/(m·K) due to the addition of h-BN. Mechanical properties testing was conducted on individual h/MC-2 microcapsules, revealing an average nominal rupture tension of 46.31 ± 2.09 N/m and an average Young's modulus of 0.17 ± 0.01 GPa. Furthermore, the h/MC-2 microcapsules were combined with silicone gel to prepare composites, incorporating h-BN to enhance thermal conductivity. The composites were found to reduce the simulative chip temperature by 15.90 %, demonstrating their potential application in thermal management.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Jinwei Zhang,Yujun Zhang,Ning Li,Shilin Nie,Leixin Yang,Yihao Luan,Yuchao Ma,Ge Wang,Kaihua Li,Long Jiao,Bowen Cheng
Physical aging presents a significant challenge that hinders the practical application of high-permeability polymer-based membranes. Herein, we have designed a polymer network membrane (PI–CO@Trip-TB (1:10)) featuring H-bonding interactions by regulating the ratio of the carboxyl-containing copolymer PI-CO (6FDA-FDA-DABA) to Trip-TB (Tröger's base), which significantly improved the anti-aging performance without compromising the high permeability. The introduction of PI-CO not only generates H-bonding interactions to enhance compatibility, but also the introduction of its linear chain segments effectively hinders the relaxation of the chain of the Trip-TB spatial structure. Which synergistically stabilizes the free volume elements and mitigates the rate of their temporal collapse. Compared to Trip-TB, the PI-CO@Trip-TB (1:10) polymer network membrane demonstrates outstanding anti-aging performance, in which the permeability of CO 2 and O 2 is maintained at approximately 60 % even after 90 days. Notably, the performance of both fresh and aged PI-CO@Trip-TB (1:10) membranes surpasses the 2008 Robeson upper bound (CO 2 /CH 4 ) and the 2015 Robeson upper bound (O 2 /N 2 ). Overall, this study establishes an effective strategy for designing high-permeability polymers with anti-aging properties for practical applications in separation membranes.
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Pharmaceuticals
·
2025
·Vol. 18
·期 11
·1699
·
IF 4.8
Zheng Ye,Chao Hong,Min Jiang,Wenkui Zou,Yaning Ren,Mingfang Li,Xinyue Xue,Xiaoting Xie,Tong Zhang,Yue Ding
Background/Objectives: Breast cancer is the most prevalent malignancy among women, and paclitaxel (PTX) is a first-line chemotherapeutic, but chemoresistance driven by ATP-binding cassette (ABC) transporters limits its efficacy. Single-target ABC inhibitors fail due to toxicity and cooperative transporter activity, creating an urgent need for safe multi-target strategies. Membrane cholesterol-rich lipid rafts support ABC transporter function, making cholesterol a key chemoresistance target. This study explored a cholesterol-targeted approach for overcoming PTX resistance.Methods: A PTX-resistant breast cancer line (MCF-7/PTX) showing ABCB1/ABCC3 co-upregulation and enriched cholesterol rafts was established. The effects of Polyphyllin H (PPH), a steroidal saponin fromParis polyphylla, were compared with lovastatin, a biosynthetic cholesterol inhibitor. In vitro and in vivo assays investigated Polyphyllin H’s cholesterol binding and effects on transporters, PTX accumulation, and tumor growth.Results: PPH directly binds membrane cholesterol, disrupting lipid rafts, downregulating ABCB1/ABCC3, reducing drug efflux, and increasing intracellular PTX to restore sensitivity. PPH showed superior cholesterol-binding and resistance-reversal efficacy than lovastatin, with faster, stronger PTX-enhanced cytotoxicity and tumor suppression.Conclusions: PPH reverses PTX resistance by targeting cholesterol-lipid rafts to inhibit multiple ABC transporters. This offers a safer adjuvant for PTX-based breast cancer therapy and a translational framework for other drug-resistant malignancies.
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Molecular Catalysis
·
2025
·
IF 4.9
Shan Lin,Haiyang Xu,Shengjie Wei,Zheng Zhou,Xu Zhang,Xuan Tong,Hangyu Zhou,Xiaodong Ma,Xu Ji,Yue Yang,Le Zhang
To enhance the hydrogen production performance and photo-corrosion resistance of ZnS and CdS based photocatalysts without relying on noble metals such as platinum, ruthenium, or gold, this study optimizes the molar ratio between Cd and Zn in Zn x Cd 1-x S solid solutions. The resulting Zn 0.4 Cd 0.6 S nanorod-shaped solid solutions exhibit superior visible-light photocatalytic activity. A non-precious metal Ni 3 (PO 4 ) 2 nano-thin layer is uniformly deposited onto the surface of the Zn 0.4 Cd 0.6 S solid solution via a room-temperature chemical co-precipitation method. This modification not only prevents oxidative photo-corrosion but also facilitates the oxidation and reduction of water during the photocatalytic surface process, significantly enhancing both the stability and hydrogen production performance of the composite catalyst. Experimental results demonstrate that the performance improvement of Zn 0.4 Cd 0.6 S by the Ni 3 (PO 4 ) 2 cocatalyst is markedly greater than that achieved with the traditional Pt cocatalyst. The maximum hydrogen production rate of the composite catalyst reaches 119.72 mmol·g⁻¹·h⁻¹, with an accumulated hydrogen production of 340.33 mmol·g⁻¹ after 3 hours. After 25 hours of photocatalytic cycling experiments, the hydrogen production rate remains at 95.95 mmol·g⁻¹·h⁻¹, approximately 80.14 % of the initial rate. The apparent quantum yield of Z4C6S-5NPO attains 61.8 %, with high value in ZnCdS-based photocatalysts. These results are promising and offer valuable insights for the development of low-cost, highly stable, and efficient composite photocatalysts.
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