Jing Yang

Bio: Jing Yang is an academic researcher from Zhejiang University. The author has contributed to research in topics: Crystallite & Ionic liquid. The author has an hindex of 2, co-authored 2 publications receiving 11 citations.

Electrodeposition of Al-Mn-Zr ternary alloy films from the Lewis acidic aluminum chloride-1-ethyl-3-methylimidazolium chloride ionic liquid and their corrosion properties

Abstract: The electrodeposition of Al-Mn and Al-Mn-Zr alloy films on low carbon steel substrate from the Lewis acidic aluminum chloride-1-ethyl-3-methylimidazolium chloride (AlCl 3 /[Emim]Cl) ionic liquids with different metal salts is investigated. The addition of ZrCl 4 in the bath with 0.04M MnCl 2 induces the higher overpotential for the electrodeposition, which decreases the size of the electrodeposited primary crystallites. Rounded nodular particles composed of many primary nanocrystallites are obtained by the electrodeposition in the bath containing 0.04 M MnCl 2 and 5 mM ZrCl 4 . The close packing of these nodular particles results in the formation of the Al-Mn-Zr ternary alloy film with a dense structure. Compared with the bare carbon steel electrode, the as-electrodeposited Al-Mn and Al-Mn-Zr alloy film electrodes shows much more negative corrosion potentials, indicating their cathodic protection effect on the substrate. As the Zr content in the alloy films becomes larger, the corrosion current density first decreases, and then increases. The Al-Mn-Zr ternary alloy film with 1.871 at.% Zr, which is prepared in the bath with 0.04 M MnCl 2 and 5 mM ZrCl 4 , manifests the lowest corrosion current density. This can be attributed to its dense film structure and good combination with the substrate.

MOF-Derived Hierarchical MnO-Doped Fe3O4@C Composite Nanospheres with Enhanced Lithium Storage.

Abstract: Hierarchically nanostructured binary/multiple transition-metal oxides with electrically conductive coatings are very attractive for lithium-ion batteries owing to their excellent electrochemical properties induced by their unique compositions and microstructures. Herein, hierarchical MnO-doped Fe3O4@C composite nanospheres are prepared by a simple one-step annealing in Ar atmosphere, using Mn-doped Fe-based metal–organic frameworks (Mn-doped MIL-53(Fe)) as precursor. The MnO-doped Fe3O4@C composite particles have a uniform nanosphere structure with a diameter of ∼100 nm, and each nanosphere is composed of clustered primary nanoparticles with an amorphous carbon shell, forming a unique hierarchical nanoarchitecture. The as-prepared hierarchical MnO-doped Fe3O4@C composite nanospheres exhibit markedly enhanced lithium-storage performance, with a large capacity of 1297.5 mAh g–1 after 200 cycles at 200 mA g–1. The cycling performance is clarified through analyzing the galvanostatic discharge/charge voltage p...

Highly Stable Gully-Network Co3O4 Nanowire Arrays as Battery-Type Electrode for Outstanding Supercapacitor Performance.

Abstract: 3D transition metal oxides, especially constructed from the interconnected nanowires directly grown on conductive current collectors, are considered to be the most promising electrode material candidates for advanced supercapacitors because 3D network could simultaneously enhance the mechanical and electrochemical performance. The work about design, fabrication, and characterization of 3D gully-network Co3O4 nanowire arrays directly grown on Ni foam using a facile hydrothermal procedure followed by calcination treatment will be introduced. When evaluated as a binder-free battery-type electrode for supercapacitor, a high specific capacity of 582.8 C g-1 at a current density of 1 A g-1, a desirable rate capability with capacity retention about 84.8% at 20 A g-1, and an outstanding cycle performance of 93.1% capacity retention after 25,000 cycles can be achieved. More remarkably, an energy density of 33.8 W h kg-1 at a power density of 224 W kg-1 and wonderful cycling stability with 74% capacity retention after 10,000 cycles can be delivered based on the hybrid-supercapacitor with the as-prepared Co3O4 nanowire arrays as a positive electrode and active carbon as negative electrode. All the unexceptionable supercapacitive behaviors illustrates that our unique 3D gully-network structure Co3O4 nanowire arrays hold a great promise for constructing high-performance energy storage devices.