查看更多>>摘要：? 2022The authors regret The full funder name and country, plus grant IDs in the text should be modified as Changchun Science and Technology Bureau (21QC08), Jilin Province Development and Reform Commission (2022C040-5), Key Laboratory for Comprehensive Energy Saving of Cold Regions Architecture of Ministry of Education, Jilin Jianzhu University (JLZHKF022021001) and Science and Technology Department of Jilin Province (20220508042RC, 20220203109SF and 20200801038GH)". The authors would like to apologise for any inconvenience caused.
查看更多>>摘要：? 2022 Elsevier B.V.The transparent ZnGa2O4 glass-ceramics doped with Mn2+/Cr3+ ions were prepared by a one-step crystallization method. The visible light fluorescence properties of Mn2+ ions in 6-coordination and 4-coordination environments and the visible light fluorescence properties of Mn2+/Cr3+ ions co-doped in transparent ZnGa2O4 glass-ceramics were studied. The results manifest that in the parent glass, Mn2+ ions mainly occupy the network former in the form of Hexa-coordination, and the luminescence center can emit orange-yellow light at ~600 nm. In transparent ZnGa2O4 glass-ceramics, Mn2+ ions and Cr3+ ions appear at the four-coordination site (Zn site) and six-coordination site (Ga site) in ZnGa2O4 spinel, respectively, and they can radiate green (510 nm) and red light (688 nm), respectively. An energy transfer mechanism of Mn2+→Cr3+ exists in ZnGa2O4: Mn2+/Cr3+ and different colors of luminescence can be produced by changing the molar ratios of components and test conditions. CIE results show that Mn2+-single-doped parent glass and glass-ceramics can be used in orange-yellow and green light displays, while Mn2+/Cr3+ co-doped transparent ZnGa2O4 glass-ceramics can be used as ideal materials for the green and red light displays.
查看更多>>摘要：? 2022 Elsevier B.V.Highly efficient bifunctional electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) have been extensively explored for overall water splitting. Herein, highly efficient bifunctional NiCo2O4-based heterostructure electrocatalysts have been designed by loading different amount of CoFe-layered double hydroxide on the self-supported nickel foam (CoFe-LDH/NCO/NF-1, CoFe-LDH/NCO/NF-2 and CoFe-LDH/NCO/NF-3) by a facile hydrothermal method. The CoFe-LDH/NCO/NF with optimal amount electrocatalyst enable excellent catalytic activity for OER and HER, such as a small of Tafel slope, low overpotential as well as good stability, surpassing RuO2, Pt/C and the majority of other NiCo2O4 based electrocatalysts. The unprecedented electrocatalytic performance is benefiting from high electrochemical active surface areas, fast charge transfer and strong synergistic effect between CoFe-LDH and NiCo2O4. Furthermore, the optimal CoFe-LDH/NCO/NF-1 as anode and cathode delivers a current density of 10 mA cm?2 at a low cell voltage of 1.65 V and presents good durability in long-term stability test for overall water splitting. This work provides an effective strategy for development of highly efficient NiCo2O4-based electrocatalysts for overall water splitting application in the future.
查看更多>>摘要：? 2022 Elsevier B.V.Transition metal oxide anodes for lithium-ion batteries (LIBs) have evoked widespread concern by reason of their high theoretical capacity, abundance, and diversity. Nevertheless, they suffer from severe volume expansion/contraction and slow reaction kinetics during cycling, resulting in poor electrochemical lithium storage performance. Herein, we ingeniously design a unique multi-component composite with Ni-NiO-MoO2 heterostructure nanoparticles in-situ dispersed on holey reduced graphene oxide (rGO) nanosheets using a facile self-sacrificed MOFs template method. The integration of Ni-NiO-MoO2 heterostructure nanoparticles and well-conductive rGO nanosheets with unique nanoholes can collaborate the inherent properties of each component to improve the reaction kinetics and synergistically enhance the lithium storage property. Thereby, the Ni-NiO-MoO2/rGO composite as a LIB anode exhibits outstanding cycling performance with a high reversible capacity (910 mAh g?1 after 220 cycles at 500 mA g?1) as well as excellent rate capability maintaining the great capacity retention of 534 mAh g?1 at 3000 mA g?1. This research offers a vital inspiration for designing and fabricating multi-component metal oxide-based composite anode materials for high-performance LIBs.
查看更多>>摘要：? 2022 Elsevier B.V.Cyanide wastewater, as a highly toxic pollutant, has detected in cyanidation factories, which is seriously harmful to the environment so that the further treatment is needed. In the present study, a simple and effective Ag-doped coralloid titanosilicate zeolite (CTS-Ag) with high adsorption and catalytic performance was developed via hydrothermal method and ion exchange method in order to investigate as a catalytic activity for the degradation of cyanide wastewater. The prepared materials were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), N2 adsorption-desorption test and X-ray photoelectron spectroscopy (XPS). Besides these, photocatalytic performance of CTS-Ag was evaluated by photodecomposition of cyanide and generation of reactive oxygen species (ROS), and the effects of components, doping concentration, catalyst dosage, wastewater concentration and wavelength of light source were investigated. The results showed that the degradation efficiencies of total cyanide, copper and zinc could reach 98.00%, 99.41% and 98.44%, respectively. The kinetics of cyanide degradation followed the pseudo-first-order model. The degradation mechanism of cyanides was elucidated based on synergistic effect of photocatalytic oxidation and the functional Ag2O. Although the metal doped in the photocatalyst can improve its properties, the Ag2O species deposited on the surface can directly participate in the reaction with the pollutants to accelerate their enrichment and degradation thus significantly improved the degradation ability for cyanides. The photoelectric properties of CTS-Ag obviously improved the migration and separation of photo-generated electrons (e?) and holes (h+), so that high photocatalytic efficiency was obtained. XPS analysis showed that cyanide was finally degraded to COX/NOX, and the copper and zinc were removed in the form of Cu (II) and Zn (II).
查看更多>>摘要：? 2022 Elsevier B.V.Structural design and regulation of absorption capacity play important roles for improving energy storage performance of bimetallic oxides in supercapacitors (SCs). Herein, three-dimensional Co3-xMnxO4 (0 < x < 3) with different Co/Mn molar ratios are synthesized by hydrothermal method. Scanning electron microscopy (SEM) demonstrates the changes of the morphology of Co3-xMnxO4 (0 < x < 3) with different Co/Mn molar ratios, in which the Co3-xMnxO4 (x = 1.09) exhibits a hairly hydrangea-like morphology and thus provides a reduced contact resistance and an effective ion transition ability proved by the electrochemical measurements. Meanwhile, by theoretical calculations we prove that the addition of Mn adequately improves the absorption capacity of OH?on Co3-xMnxO4 and thereby boosts the reaction activity. Therefore, when the Co3-xMnxO4 (x = 1.09) is used as a SCs electrode, it performs a high specific capacitance of 326 F g?1 at a current density of 1 A g?1. Moreover, an assembled asymmetric supercapacitor (Co3-xMnxO4(x = 1.09)@NF//AC@NF) demonstrates enhanced performances, such as an energy density of 17.77 Wh Kg?1 at a power density of 400 W Kg?1, an outstanding cycling stability with 83.3% retention over 10,000 cycles at a current density of 2 A g?1 and so on. Related studies indicate the potential applications of Co3-xMnxO4 in the future smart micro/nano energy storage devices.
查看更多>>摘要：? 2022 Elsevier B.V.The key to practical applications of sodium (Na) metal batteries is to develop high-performance Na metal anode. However, the unstable electrode/electrolyte interface induced by the Na dendrite growth severely shortens the working life of Na metal anode. In this work, we have developed a facile method based on a replacement reaction to construct an Ag metal layer for Na metal electrodes. The presence of robust and sodiophilic Ag metal layer can guide the uniform plating and stripping of Na ions on the surface of Na metal anode and effectively suppress the Na dendrite growth. Benefiting from a stable electrode/electrolyte interface, the increase of interfacial resistance of the Ag-protected Na metal (Na@Ag) electrode is significantly lower than that of the bare Na electrode after repeated plating/stripping. As a result, the symmetric cell with two identical Na@Ag electrodes exhibits superior cycling stability with stable over-potentials for more than 1100 h at a current density of 1 mA cm?2 and good rate performance with an over-potential of 210 mV at a current density of 5 mA cm?2 compared to the symmetric cell with two identical bare Na electrodes. Moreover, the full cell with an NaTi2(PO4)3 (NTP) cathode and an Na@Ag anode maintains good cycling stability with a capacity retention of 93.8% after 600 cycles, while the Na||NTP full cell breaks down in the 243th cycle.
查看更多>>摘要：? 2022The design of active anode materials with abundant active sites for fuel oxidation reaction is highly desirable. In-situ exsolution of nanoparticles from perovskite oxides is an effective approach to maintain its nanoscale dimensions and provide efficient active sites. Herein, a promising anode material decorated with copper-iron bimetallic nanoparticles is prepared by in-situ exsolution from A-site deficient Sr1.9Fe1.5Mo0.5?xCuxO6-δ double perovskite. With the doping of Cu, the agglomeration of iron nanoparticles is highly inhibited under reducing environment and copper-iron bimetallic nanoparticles can be uniformly formed. Through high temperature reduction, Sr1.9Fe1.5Mo0.5O6-δ substrate is transferred to heterostructure consisting of a Ruddlesden-Popper phase (Sr3FeMoO6.5) and a perovskite phase. The in-situ exsolved copper-iron bimetallic nanoparticles on the heterostructure can provide abundant active sites for fuel oxidation and lead to an improvement of polarization resistance from 0.41 Ω·cm2 to 0.22 Ω·cm2 at 800 °C under H2. In addition, the maximum power density is increased to 574 mW cm?2, which is about 37% higher than that of Sr1.9Fe1.5Mo0.5O6-δ. The present study provides a potential strategy for developing efficient anode materials for solid oxide fuel cells.
查看更多>>摘要：? 2022 Elsevier B.V.CoNi alloys are well known as excellent magnetic microwave absorption materials, but their various structures greatly influence electromagnetic properties, especially chains versus particles. Hierarchical CoNi chains were prepared using the solvothermal method in conjunction with an external magnetic field, and hierarchical CoNi particles were obtained in the absence of the magnetic field. Changing the reaction time from 6 to 12 h can change the surface structures of hierarchical CoNi alloys, as seen in the SEM images. The lattice parameters of samples are determined by XRD results, which include crystalline structures, lattice constants, mean crystallite sizes, and internal strain. The investigation of magnetic properties indicates that CoNi chains possess a stronger saturation magnetization and higher coercivity than CoNi particles as a result of their higher aspect ratios and larger crystalline sizes. Furthermore, CoNi chains have a higher microwave absorption capacity than CoNi particles, with a minimum reflection loss value of ?42.113 dB (16.5 GHz) and an effective absorption bandwidth of 3.5 GHz (13–16.5 GHz). Conductive loss, defect-induced polarization relaxation, eddy current effect, exchange resonance, N é el relaxations, multiple reflections, and scatterings all contribute to the excellent microwave absorption performance of the CoNi chains. This research establishes that a chain-like structure outperforms a particle-like structure for hierarchical CoNi alloys as microwave absorbers, and it will provide clear guidance for designing high-performance magnetic microwave absorption materials.
查看更多>>摘要：? 2022 Elsevier B.V.MXene-based electrodes have shown great performance as flexible supercapacitors in the application of portable and wearable electronics. Nevertheless, 2D MXene nanosheets suffer from severe self-stacking issues during electrode preparation, which can significantly limit the charge storage capacity. Herein, a simple yet efficient strategy is developed for fabricating the supercapacitor electrode based on the MXene@PANI coated activated carbon cloth (MXene@PANI-ACC). The resulting MXene@PANI-ACC possesses 2D/0D/1D hierarchical nanostructures, where the 1D carbon fibers are uniformly coated with MXene@PANI nanocomposites and the 0D PANI nanoparticles are densely anchored on the surfaces of the 2D MXene nanosheets. This hierarchical structure can effectively tackle the restacking issue of MXene nanosheets during electrode fabrication and provide the obtained electrode with good conductivity for fast electron transfer. Benefiting from those features, this MXene@PANI-ACC electrode demonstrates an excellent area capacitance of 1347 mF/cm2 at a current density of 1 mA/cm2 and can retain of its original capacity at 20 mA/cm2 after 5000 cycles. The excellent electrochemical performance highlights great promise of the developed electrode with hierarchical nanostructures for applications in high-performance energy storage devices.
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