A novel photocatalytic system of Cu/TiO2 for the activation C-H bond in the ethane dehydrogenation to ethylene at room temperature is proposed. The optimized 1%-Cu/TiO2 catalyst achieves C2H6 conversion of...

Lithium metal battery has great development potential because of its lowest electrochemical potential and highest theoretical capacity. However, the uneven deposition of Li+ flux in the process of deposition and stripping induces the vigorous growth of lithium dendrites, which results in severely battery performance degradation and serious safety hazards. Here, the tetragonal BaTiO3 polarized by high voltage corona was used to build an artificial protective layer with uniform positive polarization direction, which enables uniform Li+ flux. In contrast to traditional strategies of using protective layer, which can guide the uniform deposition of lithium metal. The ferroelectric protective layer can accurately anchor the Li+ and achieve bottom deposition of lithium due to the automatic adjustment of the electric field. Simultaneously, the huge volume changes caused by Li+ migration change of the lithium metal anode during charging and discharging is functioned to excite the piezoelectric effect of the protective layer, and achieve seamless dynamic tuning of lithium deposition/stripping. This dynamic effect can accurately anchor and capture Li+. Finally, the layer‐modified Li anode enables reversible Li plating/stripping over 1500 h at 1 mA cm−2 and 50 °C in symmetric cells. In addition, the assembled Li‐S full cell exhibits over 300 cycles with N/P ≈ 1.35. This work provides a new perspective on the uniform Li+ flux at the Li‐anode interface of the artificial protective layer.

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The narrow operating temperature range of an ammonia-selective catalytic reduction (NH 3 −SCR) catalyst due to the side reaction of NH 3 oxidation is a big challenge for these catalysts to adapt to the fluctuation of flue gas temperature. In this work, a multishell bifunctional V 2 O 5 /MnCo 2 O 4 catalyst for NO x abatement by an NH 3 −SCR reaction was designed by the selfassembly solvothermal and impregnation methods. The study of transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy results indicated that the V species were mainly distributed on the external shell and the internal shells principally comprising the Mn−Co mixed oxide. Hence, the multishell structure can take advantage of the superior lowtemperature SCR activity of Mn-based catalyst and high-temperature SCR activity of V-based catalyst. Finally, the multishell bifunctional V 2 O 5 /MnCo 2 O 4 catalyst exhibits a wide operating temperature range of 125−400 °C with more than 90% NO x conversion and N 2 selectivity, which is the widest operating temperature window compared with previously reported transition-metal oxide catalysts. And it also showed great tolerance to H 2 O and SO 2 across a wide temperature range, which is promising as a highly flexible NH 3 −SCR catalyst in flue gas applications that fluctuate in temperature.