Binhong He

Facile Synthesis of ZnS/N,S Co-doped Carbon Composite from Zinc Metal Complex for High-Performance Sodium-Ion Batteries

ZnS coated on N,S co-doped carbon (ZnS/NSC) composite has been prepared utilizing zinc pyrithione (C10H8N2O2S2Zn) as raw material via calcination. Through activation using Na2CO3 salt, ZnS nanoparticles encapsulated in NSC (denoted as A-ZnS/NSC) with mixed-crystal structure has also been obtained, which reveals much larger specific surface area and more bridges between ZnS and NSC. Based on the existence of bridges (C-S-Zn and S-O-Zn bonds) and the modification of carbon from N,S co-doping, the A-ZnS/NSC composite as an anode for sodium-ion batteries (SIBs) displays significantly enhanced electrochemical performances with a high reversible specific capacity of 516.6 mA h g-1 (at 100 mA g-1), outstanding cycling stability (96.9% capacity retention after 100 cycles at 100 mA g-1), and high rate behavior (364.9 mA h g-1 even at 800 mA g-1).

Self-assembly of porous CuO nanospheres decorated on reduced graphene oxide with enhanced lithium storage performance

This work aims at enhancing the cycling stability and rate capability of a CuO-based anode material for lithium-ion batteries. Here porous CuO nanospheres decorated on reduced graphene oxide (CuO-NSs/RGO) have been synthesized by a two-step thermal treatment procedure. The porous CuO nanospheres are assembled by ultra-fine nanoparticles of CuO with a size of ∼15 nm. Such a porous nature endows many merits, improving the lithium storage performances of the CuO-NSs/RGO composite used as a lithium-ion battery anode. The porous CuO-NSs/RGO composite demonstrates superior reversible capacity (753.3 mA h g−1 at 100 mA g−1) and good cycling stability (616.2 mA h g−1 after 200 cycles at 500 mA g−1). In particular, it exhibits an outstanding high-rate capability of 327.3 mA h g−1 even at 5 A g−1. The feasibility of the CuO-NSs/RGO composite as an anode material was further investigated with a commercial LiFePO4 (LFP) cathode for lithium-ion batteries.

Ethyl 5-(4-chloro-phen-yl)-2-[(Z)-(methoxy-carbon-yl)methyl-ene]-7-methyl-3-oxo-3,5-dihydro-2H-thia-zolo[3,2-a]pyrimi-dine-6-carboxyl-ate.

The title compound, C19H17ClN2O5S, was synthesized by the reaction of ethyl 6-(4-chlorophenyl)-2-mercapto-4-methyl-1,6-dihydropyrimidine-5-carboxylate and dimethyl acetylenedicarboxylate in methanol. In the molecule, the nearly planar thiazole ring, with a mean deviation from the plane of 0.0108 (3) Å, is fused with a dihydropyrimidine ring in a flattened half-chair conformation.

rac-(4R,17S,18R,26R)-Ethyl 4'-methoxy-carbonyl-5''-(4-methoxy-phen-yl)-1'-methyl-2,3''-dioxo-2'',3''-dihydro-indoline-3-spiro-2'-pyrrolidine-3'-spiro-2''-thia-zolo[3,2-a]pyrimidine-6''-carboxyl-ate.

In the title compound, C30H30N4O7S, the two spiro junctions link a planar 2-oxindole ring [with a mean deviation from the plane of 0.0319 (3) Å, a pyrrolidine ring in an envelope conformation and a thiazolo[3,2-a]pyrimidine system. Two molecules are connected into a dimer by two N—H⋯O hydrogen bonds, forming an R 2 2(8) graph-set motif. The title compound has four stereogenic centers and appears as a racemic mixture of one single diastereoisomer (RSRR/SRSS).

Perylene as a visible light photoredox catalyst for photoinduced electron transfer-reversible addition-fragmentation chain transfer (PET-RAFT) polymerization of MMA

AbstractThe organic photocatalyst, perylene, was used to mediate photoinduced electron transfer (PET) reversible addition-fragmentation chain transfer polymerization (RAFT) of methyl methhacrylate ...

Edge-Rich Quasi-Mesoporous Nitrogen-Doped Carbon Framework Derived from Palm Tree Bark Hair for Electrochemical Applications

Biomass with abundant resources and low price is regarded as potential sources of functionalized carbon-based energy storage and conversion electrode materials. Rational construction and development of biomass-derived carbon equipped with proper morphology, structure, and composition prove the key to highly efficient utilization of advanced energy storage systems. Herein, we use palm tree bark hair as a biomass source and prepare edge/defect-rich quasi-mesoporous carbon (QMC) by a direct pyrolysis followed by NaOH etching strategy. Then, the edge-rich quasi-mesoporous nitrogen-doped carbon (QMNC) is successfully fabricated through the hydrothermal method by making use of edge/defect-rich QMC and urea as carbon precursor and nitrogen source, respectively. The microstructure and composition of the resultant carbon materials are all detected by a series of techniques. In the meantime, the influence of the etching process on the preparation and electrochemical performance of edge-rich QMNC is systematically explored. The relevant results manifest that the as-prepared edge/defect-rich QMC not only possesses edge-rich plane, much increased specific surface area (SSA), and special quasi-mesopores but also reverses good conductivity and gains sufficient defects for subsequent N doping. After introducing N atoms, the obtained edge-rich QMNC exhibits outstanding capacitive property and oxygen reduction reaction performance, which are mainly attributed to the co-effect of edge-rich plane, large SSA, suitable pore structures, and effective N doping (including high doping amount and optimized N configurations). Clearly, our work not only offers an excellent biomass-derived carbon-based electrode material but also opens a fresh avenue for the development of advanced biomass-derived carbon-based electrode materials.