All-in-one radiation shielding is an emerging concept in developing new-generation radiation protection materials since various forms of ionizing radiation, such as neutrons and gamma rays, can occur simultaneously. In this study, we examine the ability of transition metal borides to attenuate both photon and particle radiation. Specifically, fourteen different transition metal borides (including inner transition metal borides) are selected for examination based on their thermodynamic stabilities, molecular weights, and neutron capture cross-sections of the elements they contain. Radiation shielding characteristics of the transition metal borides are computationally investigated using Phy-X/PSD, EpiXS and NGCal software. The gamma-ray shielding capabilities of the transition metal borides are evaluated in terms of the mass attenuation coefficient (μ_m), the linear attenuation coefficient (µ), the effective atomic number (Z_eff), the half-value layer (HVL), the tenth-value layer (TVL), and the mean free path (MFP). The mass and linear attenuation factors are identified for thermal and fast neutrons at energies of 0.025 eV and 4 MeV, respectively. Moreover, the fast neutron removal cross-sections (∑R) of the transition metal borides are calculated to assess their neutron shielding abilities. The results revealed that borides of transition metals with a high atomic number, such as Re, W, and Ta, possess outstanding gamma shielding performance. At 4 MeV photon energy, the half-value layers of ReB₂ and WB₂ compounds were found as 1.38 cm and 1.43 cm, respectively. Most notably, these HVL values are lower than the HVL value of toxic Pb (1.45 cm at 4 MeV), which is one of the conventional radiation shielding materials. On the other hand, SmB₆ and DyB₆ demonstrated exceptional neutron attenuation for thermal and fast neutrons due to the high neutron capture cross-sections of Sm, Dy, and B. The outcomes of this study reveal that transition metal borides can be suitable candidates for shielding against mixed neutron and gamma radiation.

The growing energy demands in transportation and portable electronics necessitate advancements in energy storage technologies. Supercapacitors, with their exceptional power density, rapid charge–discharge capabilities, and long cycle life, provide a compelling solution for energy storage applications. However, their inherent low energy density remains a persistent challenge. To overcome this limitation, perovskite oxides, particularly those containing iron, have emerged as promising electrode materials. These materials leverage their unique structure, compositional flexibility, rich redox chemistry, and pseudocapacitive attributes. This concise overview aims to provide insights into the development of iron‐containing perovskite oxides and their design principles. The discussion covers fundamental aspects of supercapacitors, iron‐containing perovskite structures, synthetic methodologies, defect engineering, and the construction of composites. The overview concludes by providing a perspective, particularly regarding the challenges in designing efficient and stable supercapacitors based on iron‐containing perovskite oxides.

Capitalizing on the electrochemical conversion of water into hydrogen stands as a pivotal strategy in the global transition toward sustainable energy sources. This study investigates the influence of the A‐site cation type within A₂FeNbO₆ double perovskites (where A = Ca, Sr, or Ba) on their bifunctional electrocatalytic activities. The electrocatalytic performance is scrutinized in relation to charge transfer resistance, oxygen vacancy concentration, and metal‐oxygen covalency. Among the variants, Sr₂FeNbO₆ is distinguished as the optimal catalyst, achieving a current density of 10 mA cm⁻² at overpotentials of 260 mV for the oxygen evolution reaction (OER) and 176 mV for the hydrogen evolution reaction (HER), thus matching the performance of leading metal oxide electrocatalysts. The study reveals pH‐dependent kinetics for Sr₂FeNbO₆, indicative of a lattice oxygen evolution mechanism for OER. An electrolyzer employing Sr₂FeNbO₆ electrodes for both the anode and cathode delivers a current density of 10 mA cm⁻² at an efficient cell voltage of 1.76 V for complete alkaline water splitting, while also demonstrating exceptional stability. These insights advance the understanding of material optimization for electrocatalysis and position Sr₂FeNbO₆ as a viable catalyst for the sustainable production of hydrogen.