Water electrolysis for hydrogen production has garnered significant attention due to its advantages of high efficiency, environmental friendliness, and abundant resources. Developing cost-effective, efficient, and stable materials for water electrolysis is therefore crucial. In this work, we synthesized a series of highly efficient multifunctional Mn-Co_1.29Ni_1.71O₄ electrocatalysts through an atomic doping strategy for alkaline electrocatalysts. The unique structure features and large specific surface area of these catalysts provide abundant active sites. The Mn-Co_1.29Ni_1.71O₄ catalysts exhibit an excellent oxygen evolution reaction (OER) performance in 1.0 M KOH electrolyte, with an overpotential of 334.3 mV at a current density of 10 mA cm⁻² and 373.3 mV at 30 mA cm⁻². Additionally, the catalysts also demonstrate a Tafel slope of 76.7 mV dec⁻¹ and outstanding durability. As hydrogen evolution reaction (HER) electrocatalysts, it shows an overpotential of 203.5 mV at −10 mA cm⁻² and a Tafel slope of 113.6 mV dec⁻¹. When the catalysts can be utilized for the overall water splitting, the catalyst requires a decomposition voltage of 1.96 V at 50 mA cm⁻². These results indicate that the high catalytic activity and stability of Mn-Co_1.29Ni_1.71O₄ samples make it a highly promising candidate for industrial-scale applications.

Vanadium dioxide (VO₂) thermochromic thin films with various thicknesses were grown on quartz glass substrates by radio frequency (RF)-plasma assisted oxide molecular beam epitaxy (O-MBE). The crystal structure, morphology and chemical stoichiometry were investigated systemically by X-ray diffraction (XRD), atomic force microscopy (AFM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) analyses. An excellent reversible metal-to-insulator transition (MIT) characteristics accompanied by an abrupt change in both electrical resistivity and optical infrared (IR) transmittance was observed from the optimized sample. Remarkably, the transition temperature (T_MIT) deduced from the resistivity-temperature curve was reasonably consistent with that obtained from the temperature-dependent IR transmittance. Based on Raman measurement and XPS analyses, the observations were interpreted in terms of residual stresses and chemical stoichiometry. This achievement will be of great benefit for practical application of VO₂-based smart windows.

In this work, we have successfully prepared Ru-modified oxygen-deficient NiCoP catalysts using a hydrothermal method combined with a low-temperature phosphorization method, the Ru-NiCoP-O _v catalyst exhibits overpotentials of 51.5 mV for HER.

A flower-like Ru-CoVO-P catalyst composed of ultrathin nanosheets shows excellent overall water splitting performance with low overpotentials of 88.7 mV (HER) and 248.3 mV (OER) at 10 mA cm⁻² in alkali.

In this work, we report hybrid-structure NiCo₂S₄/PPy nanosheets through hydrothermal synthesis and electrodeposition methods. Meanwhile, the NiCo₂S₄/PPy-110 samples exhibit a high specific capacitance of 983 C g⁻¹ at 1 A g⁻¹ and excellent stability.