JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2018
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IF 4.841
Yuxiang Cai,Xinbo Zhu,Wenshuo Hu,Chenghang Zheng,Yang Yang,Menghan Chen,Xiang Gao
Plasma-catalytic decomposition of low concentration ethyl acetate with LaMO 3 (M = Co, Mn and Fe) perovskite catalyst was investigated in a coaxial dielectric barrier discharge (DBD) reactor. The combination of perovskite catalyst and plasma enhanced ethyl acetate decomposition, and the activity sequence was LaCoO 3 > LaMnO 3 > LaFeO 3 . Characterizations results indicated that the activation of surface oxygen species and amount of oxygen vacancies contributed to ethyl acetate decomposition remarkably. FT-IR analysis demonstrated that the employment of LaCoO3 catalyst also reduced the amount of unwanted by-products. Based on these results, reaction mechanism of ethyl acetate plasma-catalytic decomposition process was proposed.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2014
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IF 6.007
Moa Z. Granlund,Kjell Jansson,Marita Nilsson,Jazaer Dawody,Lars J. Pettersson
The objective of this paper was to study the influence three promoters (Co, La, Mn) had on the catalytic activity of Rh-based catalysts for autothermal reforming of diesel. The catalysts were supported on CeO 2 -ZrO 2 and the loading was 1 wt.% Rh and 6 wt.% promoter. The catalytic activity was evaluated in a monolith bench scale reactor with Swedish Environmental diesel, MK1. The process parameters employed at the ATR experiments were; O 2 /C ∼ 0.45, H 2 O/C ∼ 2.5 and GHSV ∼ 50,000 h −1 , meanwhile the reactor temperature was ramped from 700 °C to 950 °C. The catalysts were compared based on their fuel conversion, H 2 yield and the selectivity of different short-chain hydrocarbons. The results showed that all three catalysts had both high fuel conversion and H 2 yield in the optimal ATR operation temperatures. The H 2 yield and fuel conversion were increasing in the order Rh/Mn, Rh/La, Rh/Co. To get further insight in the difference between the materials the fresh and aged catalytic materials were characterized. The characterization methods used were H 2 -temperature programmed reduction (H 2 -TPR), powder X-ray diffraction (XRD), and BET surface measurements. The BET surface measurements showed that promotion with La gave improved thermal stability of the material. The XRD showed a high dispersion of all metals except Co, which was present as crystals in the size range of the particles of the support.
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APPLIED SURFACE SCIENCE
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2015
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IF 2.711
Guoling Wu,Ping Li,Dongbo Xu,Bifu Luo,Yuanzhi Hong,Weidong Shi,Chunbo Liu
Visible-light-driven manganese doped SrTiO 3 nanocubes with various manganese atomic percentages in the range of 3–7%, were prepared by a hydrothermal method. These obtained photocatalysts were systematically characterized by XRD, EDX, TEM, STEM, XPS, UV–vis, PL, EIS. The results demonstrated that the Mn 4+ has substituted into the lattice of SrTiO 3 nanocubes and the absorption onset shifted toward the visible region. It is beneficial to the photocatalytic degradation of tetracycline under the visible light irradiation. Interestingly, the optimal doping atomic percentages at 5% exhibited the highest degradation rates (66.7%) in 60 min. The high photocatalytic activity could be ascribed to the Mn doping adjustment the energy band of SrTiO 3 and the highly effective separation of photo-generated electron–hole pairs. Furthermore, the possible photocatalytic mechanism has been discussed based on the active species trapping experiments and ESR analysis.
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RSC Advances
·
2015
·Vol. 5
·期 20
·15110-15117
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IF 3.84
Chunyan Zhang,Jiasheng Lai,Juncheng Hu
A series of Mn-doped CdS hollow sphere photocatalysts has been directly synthesized by a simple and facile hydrothermal route for the first time. It was demonstrated that GSH acts as the S source and a gas bubble-template in this process. The products were characterized by XRD, SEM, TEM, HRTEM, XPS, and UV-vis spectroscopy. The as-prepared CdS and Mn-doped CdS hollow spheres all showed much higher activity than P25 under visible light (λ > 420 nm) irradiation. Among them, the 2.0 mol% Mn-doped CdS sample exhibited the highest photoactivity for the removal of organic pollutant RhB, and about 99.2% MO was decomposed after 50 min of visible light irradiation. Moreover, this catalyst also showed good stability, and after four cycles, the degradation efficiency still remained at 85%. The excellent photoactivity of the as-prepared Mn-doped CdS hollow spheres could be attributed to the synergistic effects of its appropriate band-gap structure and the special porous spherical morphology. The unique hollow sphere structure may favor the harvesting of excited light due to its special multiple scattering effect within the interior space, and the doping of Mn2+ may facilitate the generation of photoinduced electrons and hole pairs, and inhibit their recombination rate by acting as temporary trapping sites. This material may have great application potentials in environmental remediation and energy harvesting.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2017
·Vol. 164
·期 13
·F1483
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IF 3.259
Yingjie Chen,Shiben Liu,Zhihao Shi,Jianhua Yu,Hongzhou Dong,Yong Qin,Liyan Yu,Lifeng Dong
Ag-MFe2O4 (M = Co, Mn) nanocomposites were synthesized and loaded onto carbon supports. As-prepared Ag-MFe2O4/C demonstrated higher catalytic activity for oxygen reduction reaction (ORR) than Ag+MFe2O4/C. The direct coupling and electron transfer between Ag and MFe2O4 in nanocomposites were proposed to enhance their catalytic activities. The Koutecky-Levich plots confirmed a direct four-electron reaction pathway for the ORR on Ag-MFe2O4/C. Furthermore, Ag-MFe2O4/C showed superior catalytic activities and excellent stability for oxygen evolution reaction (OER). Thus, Ag-MFe2O4/C nanoparticle are potential non-Pt candidates with bi-functional catalytic activity for ORR and OER.
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ELECTROCHIMICA ACTA
·
2016
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IF 4.803
Hongyan Chen,Xing Chang,Daming Chen,Jinbao Liu,Ping Liu,Yuan Xue,Hualin Lin,Sheng Han
A hierarchically flower-like structure with nanoarrays coupled with 3D macroporous sponge graphene combines the preponderances of the hierarchical nanoarchitecture and composition to enhance electrochemical performance. A graphene-karst cave flower-like Ni-Mn layered double oxides (GL) electrode material was prepared through a mild hydrothermal-carbonization process. As an electrode material, the resulting GL composite exhibited excellent performance with high specific capacitance (1,648 and 1,252 F g −1 at 0.5 and 10 A g −1 , respectively) and good cycling stability (almost 96% retention after 6,000 charge-discharge cycles) for energy storage electrode. The GL composite material acting as a positive electrode for the asymmetric supercapacitor also exhibited high specific capacitance of 116.56 F g −1 at 0.5 A g −1 and excellent cycling stability with 86.7% capacitance retention after 6,000 cycles at a current density of 5 A g −1 . This outstanding electrochemical performance may be attributed to the synergistic effect of the layered double oxides and 3D macroporous graphene oxide sponge.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2016
·
IF 3.782
Hui Feng,Niu Tang,Songbai Zhang,Bo Liu,Qingyun Cai
A novel (CdS-Mn/MoS 2 /CdTe)-sensitized TiO 2 nanotube arrays (NTAs) photoelectrode has been prepared by electrodeposite, successive ionic layer adsorption and reaction (SILAR) coupled with hydrothermal method . When a ZnS layer was added on the top of CdS-Mn/MoS 2 /CdTe/TiO 2 , a notable red-shift and high absorption was observed in the visible light region. The photocurrent density (mA/cm 2 ) systematically increases from TiO 2 NTAs (0.43), CdTe/TiO 2 (1.09), MoS 2 /CdTe/TiO 2 (1.80), CdS-Mn/MoS 2 /CdTe/TiO 2 (2.40), to ZnS/CdS-Mn/MoS 2 /CdTe/TiO 2 (3.41) under visible light irradiation, due to the type-II semiconductor heterostructures comprising multiple components with a staggered band offset. Such a heterostructure possesses an enhanced photocatalytic performance towards degradation of organic contaminant, e.g. P-Nitrophenol (PNP) and Rhodamine B (RhB) .
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Jia Liu,Jinshuo Qiao,Hong Yuan,Jie Feng,Chao Sui,Zhenhua Wang,Wang Sun,Kening Sun
Ni modified Ce 0.6 Mn 0.3 Fe 0.1 O 2 (Ni-CMF) material is evaluated as an anode material for hybrid direct carbon fuel cell (HDCFC). The Temperature Programmed Reaction (TPR) and GC test results show that the Ni additive significantly promotes the oxidation of carbon and consequently accelerates the formation rate of CO. Moreover, the Ni-CMF material is found to show a high electrical conductivity compared to pure CMF in HDCFC operating conditions. Taking advantage of the excellent catalytic activity and high conductivity, the electrolyte-supported HDCFC with Ni-CMF anode shows a high maximum power density of 580.7 mW cm −2 at 800 °C, when activated carbon is used as the fuel. Furthermore, the cell displays good stability under galvanostatic operation at current density of 50 mA cm −2 at 750 °C. These results indicate that the designed Ni-CMF composite material has the potential to be developed as an alternative anode for HDCFCs.
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SURFACE & COATINGS TECHNOLOGY
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2024
·
IF 5.3
Zhijie Jing,Peng Xu,Ling Wang,Rou Liang,Chi Pang
In this work, ultrasonic-assisted laser cladding technology was employed to fabricate shape memory alloy (SMA) coatings composed of Fe-Mn-Si-Cr-Ni on the surface of 304 stainless steel. Both experimental and simulated results unequivocally demonstrate a substantial improvement in both microhardness and wear resistance of the metal surface. Subsequently, a superhydrophobic coating with an “armor-like” structure was comprehensively prepared by integrating femtosecond laser (FSL) and nano SiO 2 spray-coating techniques. The creation of this microstructure on the coating surface efficiently facilitated the high-efficiency embedding of nano SiO 2 particles. Notably, the modified SMA coating exhibited stable superhydrophobic properties and exceptional corrosion resistance. This research not only provides novel approaches and methods for the preparation and modification of Fe-based memory alloy coatings but also highlights potential applications in the corrosion-resistant field. The work offers valuable insights for researchers in the field of materials science, emphasizing the synergistic effects of ultrasound-assisted laser cladding technology, femtosecond laser, and nano SiO 2 spraying techniques. It provides robust support for the development of new functional coatings.
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FUEL
·
2025
·
IF 7.5
Yan Tan,Xiao Liu,Yujia Zhang,Yiyang Rong,Xueying Wu,Ting Liu,Zizhen Ma,Huawei Zhang
In the current study, catalytic oxidation technology is among the most widely used methods for removing chlorinated volatile organic compounds (CVOCs). This article details the preparation of the Ag-Mn@ZSM-5 catalyst, which was prepared via the hydrothermal approach, followed by the incorporation of nano-Ag. The focus of the study is the catalytic oxidation of chlorobenzene (CB). Experimental results indicate that the hydrothermally synthesized nano-silver modified Ag-Mn@ZSM-5 catalyst, exhibiting a T90 of 290 °C, demonstrates superior performance compared to the Ag-Mn/ZSM-5 catalyst prepared via the traditional impregnation method, which has a T90 of 365 °C. As the operating airspeed increased from 7000 h −1 to 42000 h −1 , the removal efficiency of CB consistently remained above 90%, with stability maintained over a duration of 30 h. Furthermore, the catalyst exhibited excellent water resistance during a 12 h switching water test. Based on the characterization results, after loading Ag, the ratio of Mn 4+ and Mn 3+ on the surface of the Ag-Mn@ZSM-5 catalyst increases, the reducibility is enhanced, and the surface adsorbed oxygen species is increased, which is conducive to improving the catalytic activity. In addition, the Ag-Mn@ZSM-5 catalyst possesses an optimal pore structure, the proportion of mesoporous is 79.06%, suitable redox capacity, abundant acidic sites, and features a compact crystal stacking structure, which results in remarkable stability, catalytic activity, and space velocity resistance of the catalyst. These advantageous properties facilitate the adsorption and deep oxidation of CB. This study presents promising prospects for industrial applications and aims to offer innovative strategies for the treatment of chlorine-containing waste gases.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Wang Dawei,Lin Fangxu,Luo Heng,Zhou Jinhui,Zhang Wenshu,Li Lu,Wei Yi,Zhang Qinghua,Gu Lin,Wang Yanfei,Luo Mingchuan,Lv Fan,Guo Shaojun
Using metal oxides to disperse iridium (Ir) in the anode layer proves effective for lowering Ir loading in proton exchange membrane water electrolyzers (PEMWE). However, the reported low-Ir-based catalysts still suffer from unsatisfying electrolytic efficiency and durability under practical industrial working conditions, mainly due to insufficient catalytic activity and mass transport in the catalyst layer. Herein we report a class of porous heterogeneous nanosheet catalyst with abundant Ir-O-Mn bonds, achieving a notable mass activity of 4 A mg Ir −1 for oxygen evolution reaction at an overpotential of 300 mV, which is 150.6 times higher than that of commercial IrO 2 . Ir-O-Mn bonds are unraveled to serve as efficient charge-transfer channels between in-situ electrochemically-formed IrO x clusters and MnO x matrix, fostering the generation and stabilization of highly active Ir 3+ species. Notably, Ir/MnO x -based PEMWE demonstrates comparable performance under 10-fold lower Ir loading (0.2 mg Ir cm −2 ), taking a low cell voltage of 1.63 V to deliver 1 A cm −2 for over 300 h, which positions it among the elite of low Ir-based PEMWEs.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Yunqin Yang,QiuMing Liang,Tianwei Lei,Huan He,Tianquan Liang
The capacity of Co-free Li-rich Mn-based layered oxide decreases rapidly due to the irreversible lattice oxygen lose and the crystal structure change. The sodium modified cathode materials are synthesized via the sol–gel method and the electrochemical properties are investigated. Specifically, the first discharge capacity of Li 1.18 Na 0.02 Mn 0.54 Ni 0.26 O 2 is 150.5 mAh·g −1 at 2C, demonstrating a capacity preservation rate of 94.1 % after 100 cycles. And the diffusion coefficient of Li 1.18 Na 0.02 Mn 0.54 Ni 0.26 O 2 is 1.2152 × 10 -15 , which is better than 1.3798 × 10 -16 of the undoped material. This work demonstrates that appropriate Na + doping can stabilize the crystal structure, increase the lithium layer spacing and reduce the irrevocable escape of lattice oxygen within material.
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