钴掺杂增强二硫化钼纳米片的电驱动析氧性能研究

Co-doped Molybdenum Disulfide Nanosheets for Enhanced Electrocatalytic Oxygen Evolution

针对纯的二硫化钼电驱动析氧性能较弱的问题,通过微波辅助加热法制备了一系列不同含量钴掺杂的二硫化钼纳米片,并利用XRD,XPS对其进行结构表征,利用SEM,TEM对其进行形貌表征,进一步测试了这些样品在析氧反应中的催化性能。研究结果表明:通过调控钴的掺杂量,可以有效调控二硫化钼的析氧反应催化性能;当钼和钴的摩尔比为2∶1时,其催化性能最优,即电流密度为10mA/cm^2时的过电势为220mV;其催化性能的提升主要是由于钴的引入有效改变了二硫化钼的电子结构并且提升了其导电性。该研究为新型二维二硫化钼电催化剂的可控制备及其析氧性能调控提供了重要参考。

In recent years, molybdenum disulfide (MoS2) nanosheets have become a potential catalyst favored by researchers. However, the oxygen evolution reaction (OER) performance of pure MoS2 nanosheets is very limited. In this paper, a series of cobalt-doped molybdenum sulfide (MoS2-Co) nanosheets were synthesized by microwave assisted heating method. The structure was characterized by XRD and XPS, and the morphology was characterized by SEM and TEM. Then the OER of these samples was further characterized.The results show that the catalytic performance of MoS2 can be effectively regulated by adjusting the doping amount of cobalt. The MoS2-Co-2 ( n (Mo)∶ n (Co)=2∶1) drives a catalytic current density of 10 mA/cm^2 with the requirement of an OER overpotential of 220 mV. The striking catalysis performance can be attributed to the favorable electronic structure and electrical conductivity of MoS2 by doping Co. These results provide an important reference for the controllable preparation of the two-dimensional MoS2 electrocatalyst and its OER performance modulation.