Assessment of Energy Efficiency of High Entropy Metallic Glasses in Aqueous Solutions

A developed criterion of the energy efficiency of iron-boron-silicon, i.e., high entropy, metallic glasses was implemented inhydrochloric acid solutions. The criterion; lim (the conductivity of the metallic glass in aqueous solution to the conductivityof the metallic glass in air) =1 was applied to determine the energy efficiency of the metallic glass in the aqueous solutionwhen the conductivity of a metallic glass in air became equal (decreased) to the steady conductivity of the metallic glass inaqueous solution as a function of time of the exposure of the metallic glass to the aqueous solution. This criterion was usedto determine the energy efficiency of metallic glasses with a wide range of hydrochloric acid concentration. The values ofthe conductivities were determined by the electrochemical impedance spectroscopy (EIS). In addition, the criterion can beapplied under diverse test conditions with a predetermined period of the operational life of the metallic glasses as functionalmaterials. Furthermore, variations of the energy efficiency of the metallic glasses as a function of the acid concentration andtime were produced by fitting the experimental data to a numerical model using a nonlinear regression method. The profilesof the metallic glasses exhibit a less conservative behavior of energy efficiency than the applied analytical criterion.