No abstract

High concentrated ZnCl2 is trapped in a biodegradable cellulose hydrogel as electrolyte for a flexible zinc-ion hybrid supercapacitor (ZHS). Such ZHS has a wide electrochemical potential window and extremely high energy/power density.

Defect engineering and surface chemistry are closely related to the performance of materials. In this work, the effects of Zr precursors and Ti substitution on the photocatalytic performance of UiO-66-NH 2 are studied and analyzed from the perspective of defect engineering and surface chemistry. The findings show that when using ZrOCl 2 •8H 2 O as the Zr precursor combined with the postsynthetic treatment of Ti substitution, sample U-OCl-Ti shows significant improvement in Cr(VI) adsorption (20.9 mg/g) and photocatalytic reduction of Cr(VI) under visible light. The improvement can be attributed to the highly defective framework and more -NH 2 groups exposed on the surface; therefore the highest light absorption and lowest recombination rate of photogenerated electron−hole pairs are observed in U-OCl-Ti. The findings in this study contribute to a better understanding of how defects and surface chemistry affect the photocatalytic performance, thus providing some designing knowledge for the synthesis of UiO-66 or UiO-66-NH 2 with high photocatalytic performance.

The guidance law design problem is formulated as a disturbance attenuation L 2 gain control problem where target accelerations are regarded as unpredictable disturbances that are completely unknown, but bounded and guidance parameter errors are viewed as bounded control system parameter uncertainties. By using a Lyapunov-like approach to find the feedback control, a guidance law satisfying the L 2 gain performance is derived from a linear time-varying mathematical model that describes the missile-target engagement. During the derivation of the guidance law, its robust stability is proved. Simulation results show that the presented guidance law provides strong robustness properties against heading error, guidance parameter errors, and target maneuvers; thus they obtain excellent miss-distance performance over the conventional realistic true proportional navigation guidance law.