FeS_2/rGO的可控制备及其电催化析氢特性

Controllable fabrication of FeS_2/rGO and their electrocatalytic hydrogen evolution properties

为了获得较好的电催化析氢性能,将粒径尺寸约为20 nm的FeS_2纳米粒子与还原氧化石墨烯(rGO)进行复合,制备了FeS_2/rGO复合材料。分散性较好的FeS_2作为析氢反应的催化活性中心促进了H_2的生成;而导电性优异的rGO则提升了电子输运能力,正是这种有效协同作用的发挥,进一步提高了电催化析氢性能。通过优化FeS_2与rGO的投料比,在10 mA/cm^2处的过电位为130 mV。与此同时,FeS_2/rGO复合材料在酸性条件下展现出较为优异的电化学稳定性。因此,可控制备的FeS_2/rGO复合材料是一种有应用前景的析氢电催化剂。

In order to achieve better electrocatalytic hydrogen evolution performance,FeS2/rGO composite was prepared by combining FeS2 nanoparticles with particle size of about 20 nm with rGO.FeS2 with better dispersibility as the catalytic active center of hydrogen evolution reaction promoted the formation of H2,while rGO with excellent conductivity enhanced the electron transport capacity.Enhanced the electrocatalytic hydrogen evolution performance was mainly attributed to the positively synergistic effect.The optimal overpotential at 10 mA/cm^2 is 130 mV by optimizing the ratio of FeS2 to rGO.Meanwhile,FeS2/rGO composite exhibited superior electrochemical stability under acidic conditions.Therefore,the controllably prepared FeS2/rGO composite is an promising hydrogen evolution electrocatalyst.