P2-type Na2/3Ni1/3Mn2/3O2 Cathode Material with Excellent Rate and Cycling Performance for Sodium-Ion Batteries

P2-type Na2/3Ni1/3Mn2/3O2 is an air-stable cathode material for sodium-ion batteries. However, it suffers irreversible P2-O2 phase transition in 4.2-V plateau and shows poor cycling stability and rate capability within this plateau. To evaluate the practicability of this material in 2.3–4.1 V voltage range, single-crystal micro-sized P2-type Na2/3Ni1/3Mn2/3O2 with high rate capability and cycling stability is synthesized via polyvinylpyrrolidone (PVP)-combustion method. The electrochemical performance is evaluated by galvanostatic charge-discharge tests. The kinetics of Na+ intercalation/deintercalation is studied detailly with potential intermittent titration technique (PITT), galvanostatic intermittent titration technique (GITT) and cyclic voltammetry (CV). The discharge capacity at 0.1 C in 2.3–4.1 V is 87.6 mAh g−1. It can deliver 91.5% capacity at 40 C rate and keep 89% after 650 cycles at 5C. The calculated theoretical energy density of full cell with hard carbon anode is 210 Wh kg−1. The moderate energy density associated with high power density and long cycle life is acceptable for load adjustment of new-energy power, showing the prospect of practical application

Bis{μ-4′-[4-(quinolin-8-yloxymeth­yl)phen­yl]-2,2′:6′,2′′-terpyridine}disilver(I) bis­(perchlorate) dimethyl­formamide disolvate

In the binuclear title complex, [Ag2(C31H22N4O)2](ClO4)2·2C3H7NO, the AgI atom is penta­coordinated by three N atoms from the tridentate chelating terpyridyl group and by one N atom and one O atom from the quinolin-8-yl­oxy group in a distorted square-pyramidal geometry with the O atom at the apical position. The centrosymmetric complex cation involves intra­molecular π–π stacking inter­actions [centroid–centroid distance = 3.862 (4) Å] between the central pyridine and benzene rings. In the crystal structure, inter­molecular C—H⋯O hydrogen bonds result in the formation of a supra­molecular network

Effect of characteristics of (Sm,Ce)O2 powder on the fabrication and performance of anode-supported solid oxide fuel cells

Effect of characteristics of Sm0.2Ce0.8O1.9 (SDC) powder as a function of calcination temperature on the fabrication of dense and flat anode-supported SDC thin electrolyte cells has been studied. The results show that the calcination temperature has a significant effect on the particle size, degree of agglomeration, and sintering profiles of the SDC powder. The characteristics of SDC powders have a significant effect on the structure integrity and flatness of the SDC electrolyte film/anode substrate bilayer cells. The SDC electrolyte layer delaminates from the anode substrate for the SDC powder calcined at 600 °C and the bilayer cell concaves towards the SDC electrolyte layer for the SDC powder calcined at 800 °C. When the calcinations temperature increased to 1000 °C, strongly bonded SDC electrolyte film/anode substrate bilayer structures were achieved. An open-circuit voltage (OCV) of 0.82–0.84 V and maximum power density of ~1 W cm−2 were obtained at 600 °C using hydrogen as fuel and stationary air as the oxidant. The results indicate that the matching of the onset sintering temperature and maximum sintering rate temperature is most critical for the development of a dense and flat Ni/SDC supported SDC thin electrolyte cells for intermediate temperature solid oxide fuel cells

Penta­carbonyl-1κ2 C,2κ3 C-(μ-pyrazine-2,3-dithiol­ato-1:2κ4 S,S′:S,S′)(trimethyl­phosphane-1κP)diiron(I)(Fe—Fe)

In the title compound, [Fe2(C4H2N2S2)(C3H9P)(CO)5], the Fe2S2 core adopts a butterfly conformation. The PMe3 ligand is coordinated in the basal position, roughly cis to the Fe—Fe bond. The Fe—Fe distance of 2.4970 (6) Å is relatively short compared to those (ca 2.53 Å) found in another monosubstituted diiron compound. A rigid planar dithiol­ate bridge is featured, with an angle of 2.78 (1)° between the Fe—Fe bond and the normal to the pyrazine-2,3-dithiol­ate plane

(7R,8S,9S,12S)-1-(4-Chloro­benz­yloxy)-13,14-didehydro-12-hy­droxy-2,13-dimeth­oxy-N-methyl­morphinane

The title compound, C26H30ClNO4, a sinomenine derivative, has five six-membered rings, two of which are aromatic, with a dihedral angle of 34.13 (20)° between these. The N-containing ring and the fourth ring exhibit chair conformations, while the fifth ring approximates an envelope conformation. A single inter­molecular O—H⋯N hydrogen-bonding inter­action gives a one-dimensional chain structure which extends along the a axis. The absolute configuration for the mol­ecule has been determined

Dicarbon­yl(pyrazine-1,3-dithiol­ato-κ2 S,S′)bis­(trimethyl­phosphane-κP)iron(II)

The title compound, [Fe(C4H2N2S2)(C3H9P)2(CO)2], was obtained as a mononuclear by-product during the treatment of [Fe2(μ-S2C4N2H2)(CO)6] in excess trimethyl­phosphane. The Fe atom is six-coordinated by two thiol­ate S atoms, two phosphane P atoms and two carbonyl C atoms in a distorted octa­hedral geometry. The average Fe—C(O) distance (1.771 Å) is relatively shorter than that of its parent hexa­carbonyl­diiron compound, and differs by 0.511 Å from the average Fe—P(Me)3 distance. The five-membered FeC2S2 chelate ring plane is close to being perpendicular to the P/Fe/P plane [86.5 (2)°]

High-efficiency removal of Pb (II) and Cu (II) by amidoxime functionalized silica aerogels: Preparation, adsorption mechanisms and environmental impacts analysis

In this work, a novel adsorbent was evaluated for eliminating heavy metal ions from water. The cyano-functionalized silica aerogels (ANSA-X) were fabricated by functionalizing silica aerogel with 2-cyanoethyltrie-thoxysilane, and then further by the reaction with hydroxylamine hydrochloride to obtain amidoxime-functionalized silica aerogels (AOSA-X) with a large specific surface area. The FTIR and NMR analysis indicated that cyano was successfully transformed into amidoxime groups. Adsorption experiments showed the adsorption performed well with the Langmuir isotherm, and AOSA3 exhibited the optimum adsorption property with 598.05 mg/g for Pb (II) and 534.10 mg/g for Cu (II). The thermodynamic results indicated that spontaneous endothermic process was the nature of the adsorption. The adsorption rate of AOSA3 was above 86% after five successive adsorption–desorption cycles. XPS analysis and DFT calculations demonstrated that the N and O atoms participated in the chelating adsorption of Pb (II) and Cu (II), and the N atom on the amidoxime groups played a dominant role. Life Cycle Analysis (LCA) evaluated the environmental effect of the preparation of 1 kg AOSA3 adsorbent, identified the environmental factors with high environmental impact, proposed alternative solutions, proved the feasibility of preparing a novel high-efficiency amidoxime-based adsorbent, and provided a guideline for the sustainable mass production of AOSA3 adsorbent. In conclusion, AOSA3 demonstrated to have promising application perspectives in heavy metal effluent treatment

(7R,8S,9S,12S)-1-Benz­yloxy-13,14-didehydro-12-hy­droxy-2,13-dimeth­oxy-N-methyl­morphinane

In the title compound, C26H31NO4, a sinomenine derivative, the angle between the two aromatic rings is 53.34 (4)°. The N-containing ring is in a chair conformation, while the other two non-planar rings are in a half-boat conformation. In the crystal, mol­ecules are linked by O—H⋯N inter­actions into a C(8) chain along [100]

Deep motion tracking from multiview angiographic image sequences for synchronization of cardiac phases

In the diagnosis and interventional treatment of coronary artery disease, the 3D+time reconstruction of the coronary artery on the basis of x-ray angiographic image sequences can provide dynamic structural information. The synchronization of cardiac phases in the sequences is essential for minimizing the influence of cardiorespiratory motion and realizing precise 3D+time reconstruction. Key points are initially extracted from the first image of a sequence. Matching grid points between consecutive images in the sequence are extracted by a multi-layer matching strategy. Then deep motion tracking (DMT) of key points is achieved by local deformation based on the neighboring grid points of key points. The local deformation is optimized by the Random sample consensus (RANSAC) algorithm. Then, a simple harmonic motion (SHM) model is utilized to distinguish cardiac motion from other motion sources (e.g. respiratory, patient movement, etc). Next, the signal which is composed of cardiac motions is filtered by a band-pass filter to reconstruct the cardiac phases. Finally, the synchronization of cardiac phases from different imaging angles is realized by a piece-wise linear transformation. The proposed method was evaluated using clinical x-ray angiographic image sequences from 13 patients. 85% matching points can be accurately computed by the DMT method. The mean peak temporal distance (MPTD) between the reconstructed cardiac phases and the electrocardiograph signal is 0.027 s. The correlation between the cardiac phases of the same patient is over 89%. Compared with three other state-of-the-art methods, the proposed method accurately reconstructs and synchronizes the cardiac phases from different sequences of the same patient. The proposed DMT method is robust and highly effective in synchronizing cardiac phases of angiographic image sequences captured from different imaging angles