纳米花状MoS_2的水热法合成及其电催化析氢性能

Hydrothermal synthesis of crinkled nano flower-like MoS_2 and its application in hydrogen evolution

为了制备低成本、高性能的非铂析氢电催化剂,以四水合钼酸铵((NH_3)_6Mo_7O_(24)·4H_2O)和L-半胱氨酸(HSCH_2CH(NH_2)COOH,L-CYS)为原料,采用水热法于200℃下反应24h,制备出纳米花状MoS_2。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、高分辨透射电子显微镜(HRTEM)及能谱仪(EDS)等手段对纳米花状MoS_2的微观结构、形貌、组成进行表征,同时,测试评价2种MoS_2催化剂在酸性条件下电催化析氢性能。结果表明,通过该方法本文制备的纳米花状MoS_2电催化剂表现出优于市购MoS_2的析氢电催化活性。纳米花状MoS_2电催化剂表现出更优析氢电催化活性可归因于其暴露出较多边角结构及高活性晶面。

To prepare low cost,high performance non-platinum catalyst for hydrogen evolution,nano flower-like molybdenum disulfide(MoS_2)was successfully synthesized by a facile hydrothermal process at 200 ℃for 24 hours using ammonium molybdate((NH_3)_6Mo_7O_(24)·4H_2O)and L-cystine(HSCH_2CH(NH_2)COOH,L-CYS)as the precursors.The microstructure,morphology and composition of the obtained MoS_2 were carefully characterized via X ray diffraction(XRD),scanning electron microscope(SEM),high resolution transmission electron microscopy(HRTEM)and energy dispersive spectrometer(EDS).The effects of the MoS_2 morphology and structure on their catalytic activity for hydrogen evolution in acid condition are simultaneously studied via the comparison on the structure and electrocatalytic activity of the two kinds of catalysts.The results show that nano flowerlike MoS_2 catalyst is superior to the commercial MoS_2 in terms of electrocatalytic activity for hydrogen evolution.Nano flower-like MoS_2 catalyst displays excellent electrocatalytic activity for hydrogen evolution can be attributed to its more exposed edges structure and high-activity crystal plane.