MXene因其高导电性、大比表面积和可调表面官能团而受到广泛关注。然而，MXene纳米片极易堆叠，其负载位点主要为面内位点，对酞菁铁（FePc）的氧还原性能提升有限。该文通过采用简单的超声液相复合策略制备了介孔MXene(Ti3c2)负载的FePc催化剂(FePc/Meso-Ti3c2)。Meso-Ti3c2具有大量介孔和丰富的边缘位点，可优化FePc分子的四配位FeN4中心的配位环境和电子结构，并改善传质和提高活性位点的可及性，从而显著提升氧还原性能。FePc/Meso-Ti3c2展现出优异的活性和稳定性，半波电位为0.914 V vs. RHE，Tafel 斜率为57.2 mV/dec。由FePc/Meso-Ti3c2催化剂组装的锌空气电池峰值功率密度为183.1 mW/cm2，且具有高循环稳定性，性能超过商业Pt/c和FePc/Ti3c2催化剂。
Background: Norrie disease is a rare X-linked recessive disorder in affected males. The typical features are congenital blindness, progressive hearing impairment, and, in some cases, some degree of mental retardation,...
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Background: Norrie disease is a rare X-linked recessive disorder in affected males. The typical features are congenital blindness, progressive hearing impairment, and, in some cases, some degree of mental retardation, microphthalmia, microcornea, growth failure, and seizures. Norrie disease is caused by mutations in the Norrie disease pseudoglioma gene (NDP), which encodes the Norrin protein that plays a crucial role in vascular development, neural cell differentiation, and proliferation in the retina and cerebellum. The aim of the present study was to identify the geneticcause of the disease and the phenotypiccharacteristics of the patients in an affected chinese family. Materials and Methods: A chinese family with Norrie disease was studied, and clinical phenotypes of the proband were observed. With informed consent from the patients' family, blood samples from family members were collected, genomic DNA was extracted, and Sanger sequencing was performed to identify the disease-causing mutation. Results: The c.287 G > T mutation of NDP was identified by Sanger sequencing and resulted in ***96Phe. The pathogenicity prediction was performed by MutationTaster, Polyphen-2, SIFT, and PROVEAN, all of which suggested that the mutation is disease-causing and may be responsible for the phenotypes of Norrie disease. conclusion: The c.287 G > T of NDP is a novel mutation responsible for Norrie disease in a chinese family.
caO-Al2O3-SiO2/ZrO2-borosilicate (cAS/BG) multilayer glass coating was prepared by slurry method on carbon fiber reinforced carbon matrix (c/c) materials to improve their anti-oxidation ability. The weight loss ratio ...
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caO-Al2O3-SiO2/ZrO2-borosilicate (cAS/BG) multilayer glass coating was prepared by slurry method on carbon fiber reinforced carbon matrix (c/c) materials to improve their anti-oxidation ability. The weight loss ratio of coated c/c samples were 21.70 %, 1.63 %, 0.035 % respectively after 50 h oxidation at 1073 K, 1173 K, 1273 K, and the samples had excellent mechanical properties remaining. compared to single BG layer samples, the added outer cAS layer could effectively inhibit gases diffusing by sealing and healing defects. The increased antioxidation property with the temperature was mainly attributed to the improved healing ability from glass flow and thermal expansion.
Doping various elements is able to change the structural and electronic properties of two-dimensional aluminum nitride (2D AlN), hence leading to different optical properties. By Density functional theory (DFT) calcul...
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Doping various elements is able to change the structural and electronic properties of two-dimensional aluminum nitride (2D AlN), hence leading to different optical properties. By Density functional theory (DFT) calculation, broken 2D structure and 2pz electron conjugative effects to form intensive covalent bond are observed in c/P codoped 2D AlN, confirming the variation in structure and electron state. Band gap values of c/P co-doped 2D AlN are drastically reduced due to bonding ability enhancement by c atom, which renders c/P coupling anti-bonding state is pushed to valence band. Optical properties are measured at low energy range. Enhanced optical response at Elix and Eliy is attributed to the co-doping of c and P, resulting in improved optical conductivity, adsorption ability, refractive N (omega) and reflectivity R (omega). Especially for 2D Al16N13c2P1 modified by 2 c and 1 P atom doped in N sites (2c/1P), nearly three times increase is detected for optical conductivity.
corrosion behavior of the Wc-12co and enamel coatings in liquid Zn-55Al alloy is investigated comparatively. Serious corrosion consumes over 40 mu m of the Wc-12co coating after 100 h immersion. co dissolution occurs ...
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corrosion behavior of the Wc-12co and enamel coatings in liquid Zn-55Al alloy is investigated comparatively. Serious corrosion consumes over 40 mu m of the Wc-12co coating after 100 h immersion. co dissolution occurs firstly by forming Zn-co solid solution and then intermetalliccompounds. Wc is decarburized and reacts with Al to form WAl5 at high temperature. The enamel coating suffers quite slight corrosion. Porous gamma-Al2O3 layer develops at surface, which then reacts with the enamel to form a continuous caAl4O7 interlayer that prevents the further invasion of Al and provides the high corrosion resistance.
In this paper, 316H creep crack growth data at 550 degrees c are analysed to investigate the effect of inplane constraint on creep crack initiation times. A constraint parameter is proposed to quantify the difference ...
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In this paper, 316H creep crack growth data at 550 degrees c are analysed to investigate the effect of inplane constraint on creep crack initiation times. A constraint parameter is proposed to quantify the difference between an actual opening stress and the Riedel-Rice opening stress field in plane strain, using experimentally measured c*. Test data analysis shows that creep crack initiation times can be well characterized by the c* integral with the proposed parameter. A modified form of a model due to Nikbin, Smith and Webster is suggested, and scatter in predictions is shown to be reduced from -40 to -5.
The oxidation behavior of Ni-25cr-10Fe-3Si-chi Nb (0-3.0 wt.%) alloys were investigated at 1000 degrees c in ambient air. Mass gain obeys the parabolic law, and the parabolic rate constant increased with the Nb conten...
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The oxidation behavior of Ni-25cr-10Fe-3Si-chi Nb (0-3.0 wt.%) alloys were investigated at 1000 degrees c in ambient air. Mass gain obeys the parabolic law, and the parabolic rate constant increased with the Nb content due to the formation of the Laves phase. During oxidation, Nb atoms were released from the Laves phase lattice and reacted with oxygen to form Nb2O5. Oxygen could diffuse into the alloy and be combined with the Si in the Laves phase to form internal oxidation. The outer layer of oxide scales is cr2O3 and Nb2O5, and the inner layer is SiO2.
By combining atomistic simulations with a detailed analysis of individual atomic hops, we show that the diffusion of carbon in a binary Fe-c glass exhibits strong (anti-)correlations and is largely determined by the l...
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By combining atomistic simulations with a detailed analysis of individual atomic hops, we show that the diffusion of carbon in a binary Fe-c glass exhibits strong (anti-)correlations and is largely determined by the local environment. Higher local carbon concentrations lead to slower atomic mobility. Our results help explain the increasing stability of Fe-c (and, potentially, other similar metal-metalloid glasses) against crystallization with increasing solute concentration.
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