Daniil A. Bograchev

Halide perovskite nanowires (HP‐NWs) exhibit fascinating optical properties, making them attractive for advanced technologies. However, instability and lack of an effective synthetic protocol limit their commercialization. To address this, nanoporous anodized aluminum oxide (AAO) metamaterial is used as templates for the growth of CsPbBr₃ NW arrays. AAO functions as a growth template and a stabilizing medium. The NW array exhibits strong light‐trapping ability, and the pore geometric features (pore radius‐R and distance between pores‐d) can potentially enhance the light‐matter interactions (LMI). The impact of R and d on LMI within the AAO/CsPbBr₃ system using theoretical finite difference time domain (FDTD) simulations is demonstrated for the first time. Optimal LMI is observed with _R = d = 25 nm and 50 nm. Ligand‐free synthesis of CsPbBr₃ NW arrays via spin‐coating, drop‐casting, and inverse temperature crystallization (ITC) is reported. While spin‐coating and drop‐casting results in poor pore filling, the modified ITC method achieves >90% pore filling with significant NW lengths. These findings highlight the potential of AAO templates for protecting CsPbBr3 and addressing synthetic challenges in HPs and other semiconductor NW arrays. This study provides key insights for LMI in HPs and advances NW array‐based optical devices and renewable energy applications.

Electrodeposition of metals into nanopores of templates represents a crucial area of study within the field of confinement-controlled electrochemistry. This review addresses the templated synthesis of nanocomposites (nonmetallic hard templates with one-dimensional cylindrical nanopores filled with metal or semiconductor) and single nanowires and nanotubes obtained by template dissolution. The focus is on the influence of electrochemical conditions such as electrolyte composition, electrodeposition regimes, and template characteristics on the morphological and physical properties of the resulting nanostructures. Additionally, this review introduces the theoretical modeling of mass transfer in templated electrodeposition, which is critical for understanding and optimizing the pore-filling processes and the uniformity of nanostructure formation. The potential applications of these nanostructures in fields such as electronics, optoelectronics, and catalysis are also discussed, highlighting their significant implications for advancing nanotechnology and materials science.

Metal electrodeposition into the nanopores of template of porous anodic alumina type under the conditions of mixed kinetics is studied theoretically using analytical and numerical methods. Two main stages of the process are studied: the non-steady-state formation of diffusion layer in the template pores and much longer process of pore filling with metal. The effect of nonlinearity of the concentration dependence of exchange current density of metal electrodeposition on the current density of the diffusion layer formation and pore filling with metal is studied.

Carbon-free LiFe_0.5Mn_0.5PO₄ and carbon-coated LiFe_0.5Mn_0.5PO₄/C cathode materials were prepared by the mechanochemically assisted solid-state synthesis. The influence of the carbon coating on the porous structure, morphology, conductivity, and electrochemical characteristics of the cathode materials was analyzed using scanning electron microscopy (SEM), standard contact porosimetry (MSCP), electrochemical impedance spectroscopy (EIS), galvanostatic cycling, and galvanostatic intermittent titration technique (GITT). It has been shown that the specific surface area of LiFe_0.5Mn_0.5PO₄/C is twice as high as that of LiFe_0.5Mn_0.5PO₄ despite the very low content of carbon (3%). This was explained by a non-additive contribution of carbon and the active cathode material to the total specific surface area of the composite due to an introduction of carbon in the pores of the cathode material. Among the two key characteristics of a porous structure—specific surface area and volumetric porosity—specific surface area has the greatest impact on electrochemistry of LiFe_0.5Mn_0.5PO₄/C. Mathematical modeling of the discharge profiles of LiFe_0.5Mn_0.5PO₄/C was carried out and compared with the experiment. The cathode heating at high currents was evidenced. The temperatures and coefficients of solid-state diffusion were estimated at different currents. The calculated diffusion coefficient corresponds to the experimental one obtained by GITT at room temperature.