石墨烯包裹的铁镍合金的电催化析氧性能研究

Electrocatalytic performance of graphene coated FeNi alloy for oxygen evolution

氢能是一种清洁能源,其燃烧产物是水。电解水产生氢,析氧反应是水分解的半反应,但由于反应动力学较慢,需要较高的过电位才能使反应顺利进行。本文制备了700℃、800℃和900℃3种退火温度的FeNi/G复合材料,并研究其电催化析氧性能。结果表明,FeNi/G在800℃下退火时具有较低的过电位,电催化析氧性能最好。其优异的电催化析氧性能归因于800℃下退火时FeNi/G较大的比表面积,有利于氧分子的释放以及电荷的转移,因而促进电极反应的进行。这一研究成果说明,石墨烯包裹的铁镍合金经过合适温度下的退火处理,可成为优异的电催化剂。

Hydrogen energy is a clean energy source because its combustion product is water. Hydrogen is produced by electrolysis of water, and oxygen evolution reaction is a half reaction of water decomposition. However, due to the slow reaction kinetics, higher overpotential is needed to make the reaction go smoothly. In this paper, FeNi/G composites were prepared at three annealing temperatures of 700 ℃, 800 ℃ and 900 ℃, and their electrocatalytic oxygen evolution performance is studied. The results show that FeNi/G has a lower overpotential when annealed at 800 ℃, and the electrocatalytic oxygen evolution performance is the best. Its excellent electrocatalytic oxygen evolution performance is attributed to the larger specific surface area of FeNi/G-800, which is conducive to the release of oxygen molecules and the transfer of charge, thus promoting the electrode reaction. This research shows that graphene coated FeNi alloy after annealing at the appropriate temperature can become excellent electrocatalyst.