Hetroatoms doping effects on electrocatalytic activity of Graphene structure toward Hydrogen Evolution Reaction

Fossil fuels are unsustainable due to resource limitations and pollution, prompting a shift towards renewable energy sources. Hydrogen has emerged as a promising energy carrier, with the hydrogen evolution reaction (HER) being crucial for its production. This process relies on electrocatalysts, often limited in availability and cost, such as platinum-based catalysts. Recent studies have focused on graphene-based materials to improve HER efficiency, yet challenges like overpotential reduction persist. In this research, graphene structures with different doping composition (boron and nitrogen) were coated onto nickel foam to evaluate the electrocatalytic activity in a ۱ molar potassium hydroxide solution. Electrochemical tests, including linear sweep voltammetry (LSV) was conducted. Results showed that co-doped graphene sample with both nitrogen and boron enhanced catalytic activity with lowest overpotential. The sample demonstrated the best performance for HER,. by measuring the overpotential of the tested samples at a current density of ۱۰ mA/cm², it was determined that single-doped graphene with nitrogen and boron reduces the overpotential in the graphene structure to -۰.۲۲ V and -۰.۲۱ V, respectively. However, the optimal sample, co-doped graphene with these elements, exhibits an overpotential of -۰.۲۰ V, indicating an improved electrocatalytic activity for hydrogen production, showing its potential in hydrogen production.

کلیدواژه ها:

Graphene ، Hydrogen Evolution ، Overpotential ، Hetroatom doping ، Linear Sweep Voltammetry