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Research Foundation for Advanced Talents of Bei-jing Technology and Business University[19008020159]
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Insights into the Sintering Resistance of Sphere-like Mn2O3 in Catalytic Toluene Oxidation: Effect of Manganese Salt Precursor and Crucial Role of Residual Trace Sulfur
No full textManganese oxides, as a highly active oxidation catalyst, are expected to have great potential for replacing platinum group material (PGM) in volatile organic compound (VOC) degradation. Manganese sulfate and manganese chloride are usually adopted as raw materials for catalyst preparation, and Cl- and SO42- adsorbed on the catalyst might affect the catalytic activities. In this study, sphere-like Mn(2)O(3 )was prepared from different manganese sources with a simple carbonate precipitation method, which was further used to systematically study the potential poisoning effect of residual trace species on the catalytic activity of toluene oxidation. The fully washed samples all show excellent toluene oxidation activity at the beginning; however, both chlorideand sulfate-derived samples exhibited unexpected severe inactivation after the thermal aging treatment, and the light-off temperature (T-90) of toluene oxidation increased by more than 116 and 252 degrees C, while this value is only 65 and 40 degrees C over nitrate- and acetatederived Mn2O3, respectively. The characterization results of ICP-OES and XPS demonstrated that the incorporated traced sulfur and chloride species existing in fresh samples were difficult to wash away completely, which has little influence on the catalytic performance of fresh samples but will greatly affect their anti-sintering behavior. During the thermal aging process, doped sulfur gradually forms uniformly dispersed sulfate that will cover on the catalyst surface, where the transports of reactants and the supplementary lattice oxygen would be restrained significantly
Preparation of Degradable Wood Cellulose Films Using Ionic Liquids
No full textBiodegradable films prepared from cellulose have been developed in recent years. In this work, six kinds of wood cellulose films (WCFs) were successfully prepared using wood cellulose as raw materials and six ionic liquids (ILs) as solvents. The structure and properties of WCFs produced using six imidazole-based and 1,5-diazabicyclo[4.3.o]-non-5-ene (DBN)-based ILs were investigated systematically. It indicated that the WCFs produced from 1-ethyl-3-methylimidazolium diethyl phosphate ([Emim]DEP) had a maximum transmittance of 90.1% and tensile strength of 124.5 MPa, which were much higher than the counterparts to 26.2% and 42.0 MPa of the WCFs produced using DBN-based ILs. Moreover, the structure and properties of WCFs and ILs had a little change after five recycles. Based on that, we used the screened [Emim]DEP as a solvent to prepare a highly efficient ultraviolet (UV)-to-red light conversion cellulose film (LCF) by doping rare-earth light-converting particles, CaAlSiN3:Eu2+ (CASN). Results showed that the LCF emitted red light at 640 nm and had excellent light conversion ability, which was conducive to photosynthesis
Amorphous Ni-P-S@FeOOH/CC catalyst for high oxygen evolution Activity: Preparation, characterization and modeling
No full textThe oxygen evolution reaction (OER) is the key to prepare electrocatalysts for water splitting. Heteroatom doping is an effective way to improve the catalytic performance of OER by modulating the local electronic environment and stimulating the synergy. However, the complicated manufacturing methods have hindered their practical application. Herein, we demonstrate a method based on FeOOH/CC precursor to realize the preparation of Ni-P-S@FeOOH/CC catalyst through fast electrodeposition method. The overpotential of Ni-P-S@FeOOH/CC catalyst is 210 mV (10 mA cm(-2)), and still has an initial voltage of 97.35 % for 48 h. The surface area analysis shows a higher electrochemically active surface area for the amorphous structure prepared by electrodeposition method. XPS and DFT results show that the co doping of P and S can stimulate the synergistic effect and the minimum energy of adsorption/desorption in OER process is only 0.83 eV. The strategy shows good prospects for preparing efficient OER pre catalysts. (C) 2022 Published by Elsevier Ltd
MnO(2 )Nanosheets on a Carbon Nanofiber Freestanding Film by Electrospinning and In Situ Spraying for Lithium and Sodium Storage
No full textFreestanding electrodes are critical for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) with high energy density and long cycling stability. We fabricated freestanding MnO2 nanosheet-coated carbon nanofibers by synchronous in situ spraying of MnO2 nanosheets onto electrospinning polymer nanofibers, which might be a high-voltage electric field-induced assembly process. The designed film is used as anode material for LIBs and SIBs. It demonstrates good cycling stability without capacity loss after long cycling for LIBs, delivers a capacity of 256.4 mAh g-1 at 1.00 A g-1, and has an extremely stable cycle life for over 200 cycles at 0.05 A g-1. For SIBs, it delivers a capacity of 135.0 mAh g-1 at 1.00 A g-1 and has a stable cycle life for over 500 cycles at 0.50 A g-1. The capacitive contribution ratio increases from 44.4 to 76.2% (0.2-1.0 mV s-1), and the capacitive process plays a major role in the total capacity. The enhancement of the electrochemical performance is attributed to the good conductivity of the carbon nanofiber network and the one-dimensional (1D)/ two-dimensional (2D) composite structure of the electrode, in which the high performance of carbon nanofibers and MnO2 nanosheets is fully exploited. Importantly, the combination of in situ spraying and electrospinning can be extended to two or more materials with different polarities, zeta-potential values, or solubilities, broadening the applications of composites
Waste-biomass tar functionalized carbon spheres with N/P Co-doping and hierarchical pores as sustainable low-cost energy storage materials
No full textBiomass tar has exhibited promising potential for fabricating carbon-based functional materials. In this study, carbon materials with hierarchical pores, N/P co-doping, and oxygen-rich functional groups were prepared from glucose and biomass tar via a hydrothermal treatment combined with H3PO4 activation strategy and their electrochemical performances were evaluated. The results showed that the coating of tar inhibited agglomeration of carbon sphere derived from glucose and regulated its surface properties, resulting in hierarchical porous structure and surface functional groups. During thermal treatment, the resultant carbon materials were appropriately self-heteroatom doped by N and P from tar and H3PO4, respectively. Due to the unique structure, the specific capacitance of as-prepared carbon electrode was 199 F g(-1). The symmetric TGC-60 0 capacitor showed excellent electrochemical properties with specific capacitance of 175 F g(-1) and energy density of 6.1 Wh kg(-1). Furthermore, TGC-60 0 capacitor showed superior cyclic stability, the capacitance retention was around 92% after 5000 runs. This study offered a green and low-cost utilization approach for biomass tar to prepare supercapacitor with excellent electrochemical performance. (C) 2022 Elsevier Ltd. All rights reserved