## 1 Introduction  
The search for renewable, environmentally friendly energy sources, which is triggered by the depletion of fossil energy and environmental pollution [1, 2], has determined the important role of hydrogen energy [3]. Despite the high specific energy release (160 MJ/g), its significant disadvantage and limitation include the significant consumption of electricity required for hydrogen electrolysis [4]. The main task in the development of hydrogen energy is to reduce the overvoltage of the hydrogen evolution reaction (HER), which will reduce the total energy consumption. Therefore, new materials should be based on metals with high electrocatalytic activity of cathodic hydrogen release that will lead to a decrease in the overvoltage of HER and, consequently, to a reduction in the hydrogen production cost. Recently, base metals such as Ni, Co, W, or Mo [2, 5, 6, 7, 8, 9, 10, 11, 12]; their alloys [2, 5, 6, 7, 8, 9, 10, 11, 12]; and base metal-containing materials such as sulfides, nitrides, phosphides, and carbides of transition metals have been recognized as effective HER catalysts [14, 15, 16, 17, 18, 19]. This is due to their chemical stability; their low cost; and, most importantly, to the low overvoltage of hydrogen release [20]. Tungsten, having unique properties such as a high melting point and chemical resistance, is a promising material for the HER from alkaline electrolytes [21, 22]. The potential use of a porous layer of tungsten obtained in the process of dealloying accompanied with the removal of the second metal has determined the interest in the study of tungsten-rhenium alloys. Due to its thermodynamic properties, a tungsten-rhenium alloy is promising for the formation of a highly porous surface by anodic dissolution. The mechanism of anodic formation of such structures has received considerable scientific and technological interest. A large number of works are devoted to the synthesis and study of nanostructured mesoporous materials obtained by various methods at ordinary temperatures. The current state of the problem is analyzed elsewhere [23; 24; 25]. There are several common methods for synthesizing mesoporous materials. For example, one of them is based on the use of nanotemplates such as silicon dioxide or organic polymers as structure-forming agents for metallic nanolayer formation. After chemical removal of the template, nanopores are formed. We would also like to mention here the method of thermal decomposition of unstable nitrogenous metal compounds, which are used to form nanofoams with a record low density. The removal of a more electronegative alloy component (so-called dealloying) is less widespread and is mainly used to obtain precious metals in the mesoporous state--gold, silver, and platinoids [26; 27]. Thus, [PERSON] and [PERSON] [28] presented a method for the preparation of mesoporous palladium in an aqueous sulfuric acid solution. The existing works on the electrochemical behavior of anodes made of binary alloys in low-temperature electrolytes are scattered and, as a rule, do not pay much attention to the formed near-surface structures and the development of the electrode surface. The situation is somewhat better in low-temperature electrolytes [29]. Currently, the research in the field of mesoporous materials is shifting its focus toward the materials' synthesis. Apart from impressive specific surface areas, these materials demonstrate a sufficiently high electronic conductivity and high reaction capacity. The possibility of extracting expensive rehenium and simultaneous formation of a porous tungsten structure, which can be used as a substrate for catalyst deposition, from a tungsten-rhenium alloy is of considerable interest. The main task of this work is to evaluate the change in the structure of the tungsten-rhenium alloy depending on the electrolysis conditions and the composition of the solution at constant temperature.