[en] Flower-like manganese-cobalt (Mn-Co) oxysulfide supported on Ni foam substrate is synthesized by two-step hydrothermal method as binder-free faradaic electrode for charge storage. The crystalline phase and morphology of as-fabricated materials are well-characterized by X-ray diffraction (XRD), Scan electron microscope (SEM), and X-ray photoelectron spectrum (XPS). The results demonstrate that the Mn-Co oxysulfide exists as polycrystal and sulfide are successfully partially substituted into Mn-Co oxide. Impressively, the Mn-Co oxysulfide electrode exhibits excellent electrochemical performance with an ultrahigh specific capacity of 490 C g⁻¹ at 2 A g⁻¹ and 415 C g⁻¹ at 20 A g⁻¹ which is much higher than 301 C g⁻¹ at 2 A g⁻¹ and 174 C g⁻¹ at 20 A g⁻¹of the Mn-Co oxide nanosheets electrode. Moreover, the flower-like Mn-Co oxysulfide electrode also reveals good cycling stability with 86.5% capacity retention at high current density of 20 A g⁻¹ after 3000 cycles. Because of the flower-like structure and partial substitution by sulfide, which provides large reaction surface area and more flexible structure, Mn-Co oxysufide electrode with excellent electrochemical performances would have great prospect for energy storage device applications.

[en] The paper made a study on the possibility of the U-Th self-sustaining cycle in CANDU-HWR. The result of the present calculation study demonstrated the practical feasibility of U-Th self-sustaining cycle in CANDU-PR, with high enrichment of ²³³U to ²³²Th fuel in outer ring and low enrichment of ²³³U to ²³²Th fuel in inner three rings in the design. (authors)

[en] In this work, a facile and feasible soft template method with the aid of buffer solution is successfully applied to synthesize high-order mesoporous cobalt tungstate for the first time. Attributing to the regulation of reaction solution’s pH value and the existence of template, the phenomenon of phase transformation occurs, and high-order mesoporous structure is formed. Because of the variation of phase and morphology, only 448 mV can deliver a current density of 10 mA cm⁻² with a small Tafel slope (61 mV dec⁻¹) for mesoporous cobalt tungsten oxide hydroxide, while the cobalt tungstate nanoparticles cannot satisfy the basic demand of electrocatalysts. Herein, rational phase transformation and morphology design can significantly affect the property of oxygen evolution, which can provide vast opportunities to turn into candidates for the novel oxygen evolution catalyst. (paper)

[en] Flower-like Ni_0·85Se nanosheets (Ni_0·85Se-16 h) are synthesized by a two-step hydrothermal method. The electrochemistry performance and phase transformation of nickel selenides which obtained from different reaction times are examined. All the nickel selenides experience the phase transformation process. However, the opened flower-like Ni_0·85Se-16 h sample takes the phase change process more slowly than others. In addition, the electrochemical properties differences between flower-like Ni_0·85Se-16 h and NiO are also studied. Ni_0.85Se-16 h exhibits a areal capacitance of 3.35 F cm⁻² at 4 mA cm⁻² which is approximately 3.6-fold higher than that of NiO. Then, the hybrid supercapacitor is assembled by using Ni_0·85Se-16 h as a positive electrode and activated carbon as a negative electrode. The hybrid configuration could acquire a high energy density of 44.2 Wh kg⁻¹ at a power density of 888.9 W kg⁻¹, and 28.5 Wh kg⁻¹ at 12825 W kg⁻¹. The above results emphasize the fact that the opened flower-like construction could effectively promote the electron/ion transportation in the interface between the electrolyte and the active materials which delay the phase transition process and prove the fact that selenization process could enhance the areal capacitance more effectively than oxidation process. Thus, make it a potential candidate as battery-like electrode materials for hybrid supercapacitors.