Investigating the Effect of BN Morphology an‎d Weight Percentage in GO/ BN Composite on Electrochemical Hydrogen Storage Application

2/25/2027 12:00:00 AM

With the rapid development of industry, the deman‎d for energy is also increasing. The combustion of fossil fuels such as coal, oil an‎d natural gas leads to environmental pollution problems an‎d the limitation of their reserves. Therefore, the development of renewable energy sources can be a suitable alternative to them. Boron nitride is a material that is similar to graphite in many aspects such as high specific surface area, mechanical strength, oxidation resistance an‎d low density; therefore, it is a suitable choice for hydrogen storage. Also, graphene oxide (GO), with its high surface area to volume ratio, can store more hydrogen in all the adsorption sites of the existing boron nitride honeycomb structure. This research reports the synthesis of boron nitride by direct boric acid reduction an‎d the synthesis of graphene oxide by improved Hammers method. Then, a hydrothermal method was used to synthesize the composite of these two materials. To prove the success of the synthesis method, various characterization methods were used. X-ray diffraction (XRD), Raman spectroscopy confirmed the formation of boron nitride an‎d graphene oxide. In addition, BET test was performed to determine the specific surface area an‎d porosity of the materials. Also, scanning electron microscopy showed the presence of a two-dimensional structure. These images showed a relatively uniform distribution of boron nitride an‎d graphene oxide sheets next to each other an‎d the formation of a porous an‎d multilayered structure that is suitable for the penetration of electrolyte an‎d ions. The hydrogen storage capacity of the synthesized samples was eva‎luated using a three-electrode electrochemical method in 3 M potassium hydroxide (KOH) solution. Cyclic voltammetry (CV) in the potential range of -1 to 0.2 V, galvanostatic charge an‎d discharge (GCD) in the potential range of -1 to 0 V an‎d electrochemical impedance spectroscopy (EIS) were used to investigate the optimal sample. The highest specific capacitance was obtained for the 50GO-50BN sample, which is equal to 34.148 F.g-1 at a scan rate of 10 mV.s-1. The hydrogen storage capacity of this sample is also equal to 791.66 F.g-1 at a current density of 10 mA.g-1. These results indicate that the synergistic properties of graphene oxide an‎d boron nitride, by creating a balance between electrical conductivity an‎d stability, an‎d the active specific surface area plays an important role for electrochemical adsorption an‎d reversible hydrogen storage.

نيتريد بور، اكسيد گرافن، ناهم ساختار، ذخيره سازي الكتروشيميايي هيدروژن

Boron Nitride (BN), Graphene Oxide (GO), Heterostructures, Electrochemical Hydrogen Storage (EHS).

Zeinab Shokri

Prof. Dr. Hossein Aghajani