ACS Catalysis
·
2025
·
IF 13.1
Jia-Yi Chen,Jie-Tian Yang,Yu-Shu Han,Yu-Qiong Huang,Na-Na Tian,Ju-Hua Li,Zhong-Li Wang
Acidic oxygen evolution electrodes are essential anodes in acidic water splitting, carbon dioxide, nitrogen electrochemical reduction, etc. The iridium–ruthenium (Ir–Ru)-based catalysts have the potential to withstand the harsh acid corrosion and oxidation environments of the oxygen evolution reaction, but there are still challenges in designing and preparing highly active and stable integrated Ir–Ru electrodes. Herein, we develop a cost-effective and scaled-up passivation engineering strategy to prepare an integrated Ir–Ru anode containing a Ti substrate, a manganese titanate (MnTiO3) passivation layer, and an Ir–Ru oxide catalytic layer. By uniformly loading an appropriate amount of divalent Mn ions (Mn2+) on the surface of zerovalent Ti metal (Ti0) and heating to 350 °C in air, a special passivation reaction occurred between Mn2+ and Ti0, producing a dense MnTiO3 passivation layer. The conductive MnTiO3 passivation layer forms a strongly bonded interface with the Ti substrate, effectively protecting the Ti substrate from electrochemical oxidation to insulating TiO2. Then, on the surface of MnTiO3, a thin layer of complex ions of Ir and Ru is uniformly adsorbed, and after secondary heat treatment, Ir–Ru mixed oxides are generated. Interestingly, the lattice of MnTiO3 perfectly matches that of Ir and Ru oxides, thus achieving the epitaxial growth of Ir–Ru mixed oxides on the surface of MnTiO3 with strong interaction interfaces. These result in the high activity and stability of low-loading Ir–Ru oxides, with an overpotential of only 165 mV at 10 mA cm–2 and over 3000 h of stable operation at 300 mA cm–2 in acidic electrolytes. In situ Raman spectroscopy combined with isotope labeling experiments further confirms that the Ir–O–Ru local structure suppresses the participation of lattice oxygen and enhances the stability of active Ru species.
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DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 5
·401
·
IF 4.3
Xiaoxiao Peng,Haiyan Jing,Lan Yu,Zongdeng Wu,Can Su,Ziyu Ji,Junjie Shu,Hua Tang,Mingzhu Xia,Xifeng Xia,Wu Lei,Qingli Hao
To significantly improve the tribological performance of epoxy resin (EP), a novel h-BN/MoS2composite was successfully synthesized using spherical MoS2particles with lamellar self-assembly generated through the calcination method, followed by utilizing the “bridging effect” of a silane coupling agent to achieve a uniform and vertically oriented decoration of hexagonal boron nitride (h-BN) nanosheets on the MoS2surface. The chemical composition and microstructure of the h-BN/MoS2composite were systematically investigated. Furthermore, the enhancement effect of composites with various contents on the frictional properties of epoxy coatings was studied, and the mechanism was elucidated. The results demonstrate that the uniform decoration of h-BN enhances the chemical stability of MoS2in friction tests, and the MoS2prevents oxidation and maintains its self-lubricating properties. Consequently, due to the protective effect of h-BN and the synergistic interaction between h-BN and MoS2, the 5 wt % h-BN/MoS2composite exhibited the best friction and wear resistance when incorporated into EP. Compared to pure EP coatings, its average friction coefficient and specific wear rate (0.026 and 1.5 × 10−6mm3N−1m−1, respectively) were significantly reduced. Specifically, the average friction coefficient decreased by 88% and the specific wear rate decreased by 99%, highlighting the superior performance of the h-BN/MoS2-enhanced epoxy composite coating.
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Ganhua Qiu,Ting Wang,Xiaoli Li,Xueqin Tao,Benxia Li
A heterostructure photocatalyst consisting of BiOCl nanoplates and a bismuth-organic hybrid layer (alias BiCl3Br–CTA) was synthesized through a one-step solvothermal process. The BiOCl/BiCl3Br–CTA heterostructures exhibited broad light absorption and enhanced electron–hole separation efficiency. Moreover, the abundant oxygen vacancies (OVs) and superoleophilic surface endowed the photocatalyst with high abilities for adsorption and activation of O2 and toluene. Therefore, the BiOCl/BiCl3Br–CTA photocatalyst showed excellent activities for the C(sp3)–H bond oxidation of toluene under full-spectrum irradiation and visible light of simulated sunlight, which are 6.8-fold and 237.8-fold, respectively, than those of BiOCl nanoplates. The photocatalytic mechanism was revealed by a series of controlled experiments and in situ ESR detections. The selective oxidation of toluene was promoted by the synergy between the electrons in BiOCl for activating O2 and the holes in the BiCl3Br–CTA layer for activating the C(sp3)–H bonds. This research demonstrates an effective strategy to construct high-activity photocatalysts for challenging organic transformations.
研究领域:
材料科学
·
环境科学
·
催化化学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Jingwen Song,Kai Ma,Tifeng Jiao,Ruirui Xing,Lexin Zhang,Jingxin Zhou,Qiuming Peng
Graphene oxide (GO)-based nanocomposite films via facile and appropriate self-assembly methods have demonstrated many potential applications in wide fields. This study demonstrates a facile and clean route to prepare graphene oxide-dye composite films using Langmuir-Blodgett (LB) technique at room temperature. By electrostatic interaction between cationic dye molecules and negatively charged GO sheets as well as π-π interactions, GO-dye composite LB films were formed spontaneously. As a soft platform for dye molecules, GO sheets induce dye molecules to self-assemble and form highly ordered structures containing H-aggregates and/or J-aggregates. The morphological characterization results show the formation of GO-dye composite films with smooth and dense surfaces. And the spectral results reveal that dye molecules stack in well-organized aggregates on the surface of GO sheets corresponding to monomers in bulk solution. The present research work about GO-dye composite films by LB method may provide new clues to prepare organized composite films and demonstrate potential applications in many fields.
研究领域:
材料科学
·
纳米科技
·
表面化学
·
胶体与界面科学
·
功能薄膜
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DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2019
·
IF 4.745
Shanjian Mao,Yinbo Wan,Haiyun Peng,Li Luo,Guisheng Deng
Pd(PPh3)2Cl2-catalyzed selective tandem cyclization/oxidation of available conjugated diazo ene-yne-ketones under O2 atmosphere led to the formation of diazo trisubstituted furans. The Rh2(OAc)4-mediated selective C(sp2)–H insertion at the ortho-position of 2-aryl group (R1) of the furan moiety under N2 atmosphere occurred to construct naphthalene cycle, affording trifunctionalized naphtho[1,2-b]furans. C(sp2)–H insertion at the 4-position of the furan ring, and Wolf rearrangement of diazo moiety have not been observed.
研究领域:
有机化学
·
合成化学
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DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2015
·
IF 3.615
Sheng-Jie Chen,Yong-Qi Li,Peng Wang,Yong Lu,Xiao-Li Zhao,Ye Liu
Two kinds of novel zwitterionic phosphines of L1 and L2 have been synthesized in which the sulfonate groups (–SO 3 – ) are incorporated to render them amphiphilic. Both of them are strong π-acceptor ligands in which the positive-charged imidazoliums with intensive electron-withdrawing effect are vicinal to the coordinating phosphorous atoms. The amino-group of piperidyl is additionally incorporated in L2 to make it behave as a hybrid ligand with potential hemilability. The comparison of the ligands of L1 and L2 in Rh-catalyzed hydroformylation of styrene (and its derivatives) and the effect of water on their behaviors were discussed. Without the involvement of water, the catalytic system of Rh(acac)(CO) 2 - L2 exhibited lower activity than that of Rh(acac)(CO) 2 - L1 under the same conditions. However, the dramatic promotion effect of water as a suspension was observed especially for Rh(acac)(CO) 2 - L2 system with TOF spurred up from 195 to 470 h −1 . The corresponding in situ high pressure FT-IR spectral information showed that the presence of water in Rh(acac)(CO) 2 - L2 system greatly facilitated the formation and stability of the active Rh–H species ( ν Rh-H , 2047 cm −1 ), which was in charge of the efficient hydroformylation of styrene and its derivatives.
研究领域:
有机化学
·
催化化学
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 5
·1258-1262
·
IF 2.726
Zhang Xingcong,Zhong Yunzhu,Chen Hongyu,Cheng Yujie,Sun Qingdi,Zhang Hao,He Qian,Zhang Ying,Guo Guanghui,He Xiaohui,Ji Hongbing
Through screening Ce precursors and pyrolysis temperatures [Ce(acac) 3 as Ce precursors and pyrolysis at 900 °C], zeolitic imidazolate framework-8(ZIF-8) derived nitrogen-doped carbon supported cerium single atom catalyst(Ce 1 /NC) is successfully prepared by ball milling method. The Ce 1 /NC catalyst exhibits exceptional catalytic performance in the selective oxidation of saturated C-H bonds in aromatic compounds, e.g. , 91% conversion and 99% selelctivity can be achieved in the oxidation of ethylbenzene to acetophenone under mild reaction conditions.
研究领域:
催化化学
·
材料科学
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DOI
高影响因子
RARE METALS
·
2025
·Vol. 44
·期 4
·2379-2392
·
IF 11
Na Guo-Quan,Cui Wen-Gang,Shi Hang-Yan,Li Zheng-Long,Gao Fan,Wang Xing-Qiang,Wang Ke,Gao Yong,Yang Ya-Xiong,Shen Zi-Chao,Pan Hong-Ge
High-capacity LiBH 4 is a promising solid hydrogen storage material. However, the large electron cloud density between the B-H bonds in LiBH 4 induces high dehydrogenation temperatures and sluggish dehydrogenation kinetics. To solve the above problems, it is proposed to enhance the hydrogen storage properties of LiBH 4 through the synergistic effect of Brønsted and Lewis acid in Hβ zeolite. Composite hydrogen storage systems with different mass ratios were prepared by simple ball-milling. At a LiBH 4 -to-Hβ mass ratio of 6:4, the 6LiBH 4 -4Hβ system released hydrogen at 190 °C and achieved a hydrogen release capacity of 7.0 wt% H 2 upon heating to 400 °C. More importantly, the hydrogen release capacity of the system reached 6.02 wt% at 350 °C under isothermal conditions after 100 min and 7.2 wt% at 400 °C under isothermal conditions after 80 min, whereas the pristine LiBH 4 only achieved 2.2 wt%. The improvement in hydrogen storage performance of the system was mainly attributed to two factors: (i) Lewis acid sites with acceptable electrons in the Hβ weaken the electron density of B–H bonds in LiBH 4 , and (ii) the H + proton from the Brønsted acid sites and H − of LiBH 4 undergo a H + + H − = H 2 reaction. Theoretical calculations revealed that the Lewis and Brønsted acid sites in the Hβ zeolite are conducive to the weakening of B – H bonds and that storage charge transfer occurs near the Lewis acid sites. The present work provides new insights into improving the hydrogen storage performance of LiBH 4 by weakening the B–H bonds in the LiBH 4 .
研究领域:
能源存储
·
催化
·
材料科学
·
无机化学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2024
·
IF 4.8
Yuxin Li,Juanping Zhou,Hu Wen,Haitao Yin,Shunyu Han,Nanzhe Jiang
Clay is a rich aluminosilicate resource with unique advantages as a raw material for zeolites production. However, synthesizing nanosized single-crystalline zeolites through a simple approach using clay remains a significant challenge. In this paper, acid-washed montmorillonite (MSR) was used to prepare nano-H-ZSM-5 single crystals with high crystallinity, uniform grain size and permeable straight pores under the induction of a small amount of organic template tetrapropylammonium hydroxide (TPAOH). Through temperature-staged treatment, the nucleation and growth process of zeolite were decoupled, ultimately achieving precise control over the size of the nano-single crystals. Mechanistic study showed that the low-temperature aging process produces smaller structural units which probably derived from the geopolymer topology of the clay, providing more active sites for zeolite nucleation, leading to the rapid crystallization during the high-temperature process. The porous structure promotes material diffusion, inhibits aromatic cycling and reduces carbon formation in the pores. The large specific surface area and nanoscale multilayer pore structure delay carbon accumulation and increase carbon holding capacity. These properties make nano-ZSM-5 single crystals an excellent choice for high olefin selectivity and long catalytic life in the methanol-to-olefin reaction. This synthetic route provides a general strategy for preparing nanosized zeolite single crystals from clay.
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DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Yali Niu,Rui Yao,Shuhui Fan,Jinping Li,Guang Liu
Anion-exchange membrane water electrolyzers (AEMWE) are promising for clean hydrogen production. However, the high energy barriers associated with water adsorption and dissociation combined with the high adsorption energy of hydrogen intermediates (H*) in alkaline environment result in slow kinetics for the hydrogen evolution reaction (HER). To tackle this, we report a catalyst comprising Pt nanoparticles loaded on Co(OH) 2 /PTI nanosheets (Pt/Co(OH) 2 /PTI) for efficient alkaline HER at high current densities. Operando characterization indicates that Co(OH) 2 promotes H 2 O adsorption and dissociation, while the Pt nanoparticles optimize H* adsorption energy, enabling preferential H* adsorption at the Pt site to facilitate H 2 generation and desorption. Furthermore, the ultra-thin poly (triazine imide) (PTI) support prevents the Pt nanoparticles aggregation, thereby enhancing catalyst stability. As a result, the synergistic Pt/Co(OH) 2 /PTI achieves superior HER performance, demanding an overpotential of merely 7 mV to achieve a current density of 10 mA cm −2 and just 220 mV to drive 1 A cm −2 , and it maintains stable for over 220 h under the condition of 1 A cm −2 . Additionally, the electrolyzer assembled using Pt/Co(OH) 2 /PTI as the cathode demonstrates stable operation for 200 h at 0.5 A cm −2 under 70 °C, highlighting its strong potential for industrial applications.
研究领域:
电催化
·
能源化学
·
材料科学
·
纳米催化
·
氢能技术
·
电化学工程
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DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 10
·869
·
IF 3.444
Xinyu Liu,Meihuan Lu,Xuan Wang,Juyou Lu,Jianxin Yang
For decades the steric effect was still ambiguously understood in catalytic benzylation reactions of arenes with benzyl alcohol, which limited the green synthesis of phenylmethane derivates in industrial scale. This research applies a series of silica–alumina beta zeolites to systematically evaluate factors like catalyst porosity, reactants molecule size, and reaction temperature on catalytic benzylation. First, a suitable hierarchical beta zeolite catalyst was screened out by X-ray powder diffraction, N2adsorption−desorption, and probe benzylation withp-xylene. In the following substrates expanding study, for a typical benzylation of benzene, it showed extraordinary performance among literature reported ones that the conversion was 98% while selectivity was 90% at 353 K only after 10 min. The steric effect of aromatics with different molecular sizes on benzylation was observed. The reaction activities of four different aromatics followed the order: benzene > toluene >p-xylene > mesitylene. Combined with macroscopic kinetic analysis, this comprehensive study points out for the first time that the nature of this steric effect was dominated by the relative adsorption efficiency of different guest aromatic molecules on the host zeolite surface.Keywords:benzylation;benzyl alcohol;hierarchical zeolite;steric effect;green catalysis
研究领域:
化学工程
·
催化科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Fan Zhang,Mao chen,Hailong Wang,Gang Shao,Yongshun Qi,Chengliang Ma,Bingbing Fan,Xiaoxuan Pian,Rui Zhang,Hongxia Li,Yongqiang Chen
The h-BN/ZrO 2 composites with different 3Y–ZrO 2 content were prepared by spark plasma sintering at 1800 °C. The sintering behavior , bulk density, apparent porosity , thermal conductivity , thermal expansion coefficient , bending strength , thermal shock resistance , microstructure and phase were analyzed. The optimum specimens were used to test the resistance to corrosion of molten steel for 10, 20, 40, 80 min respectively. The results indicated that ZrO 2 could facilitate the sintering process of h-BN matrix under the action of spark plasma. Especially, for the composites with 30 wt% 3Y–ZrO 2 , the porosity could decrease to 1.1% and the flexural strength could exceed 150 MPa. The microstructure showed the h-BN grains and 3Y–ZrO 2 grains are closely combined. The XRD patterns indicated that the t-ZrO 2 diffraction peak gradually enhanced with the increase of density. With the increase of erosion time, the erosion rate increased significantly. After the surface of the specimen is eroded, the erosion resistance of the matrix would decrease significantly. This h-BN/ZrO 2 could be as side-dam used in the thin strip continuous casting process .
研究领域:
材料科学
·
陶瓷工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）