Electrochemically Induced Phase Transformation in Vanadium Oxide Boosts Zn-Ion Intercalation.

Vanadium oxides are excellent cathode materials with large storage capacities for aqueous zinc-ion batteries, but their further development has been hampered by their low electronic conductivity and slow Zn diffusion. Here, an electrochemically induced phase transformation strategy is proposed to mitigate and overcome these barriers. X-ray diffraction analysis confirms the complete transformation of tunnel-like structural VO into layered VO·6HO during the initial electrochemical charging process.

Characterization of Regional Combustion Efficiency using ΔXCO: ΔXCO Observed by a Portable Fourier-Transform Spectrometer at an Urban Site in Beijing.

Measurements of column-averaged dry-air mole fractions of carbon dioxide and carbon monoxide, CO (XCO) and CO (XCO), were performed throughout 2019 at an urban site in Beijing using a compact Fourier Transform Spectrometer (FTS) EM27/SUN. This data set is used to assess the characteristics of combustion-related CO emissions of urban Beijing by analyzing the correlated daily anomalies of XCO and XCO (e.g.

Impacts of Oxygen Vacancies on Zinc Ion Intercalation in VO.

The aqueous zinc ion battery has emerged as a promising alternative technology for large-scale energy storage due to its low cost, natural abundance, and high safety features. However, the sluggish kinetics stemming from the strong electrostatic interaction of divalent zinc ions in the host crystal structure is one of challenges for highly efficient energy storage. Oxygen vacancies (V), in the present work, lead to a larger tunnel structure along the axis, which improves the reactive kinetics and enhances Zn-ion storage capability in VO (B) cathode.

Influence of the type of carrier on ferromagnetism in a Si semiconductor implanted with Cu ions.

Silicon semiconductor samples implanted with Cu ions and samples co-implanted with Cu- and N-ions were prepared by MEVVA and the Kaufman technique. None of the samples showed evidence of secondary phases. The initially n-type Si matrix, when implanted with Cu ions, changed to a p-type semiconductor, and the Cu ions existed as local Cu2+ cations in the p-type environment.

Role of an external electric field on hybrid halide perovskite CHNHPbI band gaps.

The organic-inorganic perovskite CHNHPbI has attracted much attention due to their power conversion efficiency as a potential photovoltaic material, but the role of an external electric field has not been well understood. Based on first-principles calculations, the effects of an external electric field (E) applied along the [111] direction of the orthorhombic perovskite, CHNHPbI, on its electronic structure and optical properties are investigated. Our results indicate that the electric field strength affects the band gap (E) of CHNHPbI (MAPbI, MA = CHNH).