MoS2/CoAl-LDH 异质结构可提高析氧反应的效率,Colloids and Surfaces A: Physicochemical and Engineering Aspects

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MoS2/CoAl-LDH 异质结构可提高析氧反应的效率
Colloids and Surfaces A: Physicochemical and Engineering Aspects ( IF 4.9 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.colsurfa.2020.125419
Mengke Rong , Fan Yang , Chao Yu , Shuai Wang , Hong Zhong , Zhanfang Cao

摘要通过在CoAl-LDH层中引入钼酸盐，利用水滑石在钼酸盐水热硫化中的限域效应，可以合成高比例的1T相MoS2/CoAl-LDH复合材料。与传统的水热法相比，得到的MoS2具有比表面积大、缺陷多的优点，且CoAl-LDH板完全打开，两者在催化过程中具有明显的协同作用。该材料在玻碳电极表面进行改性，应用于碱性溶液中的电催化析氢和析氧。进行了线性伏安法、塔菲尔曲线、交流阻抗曲线和稳定性测试。结果表明，基于水滑石的层间限制效应，采用两步法制备的MoS2/CoAl-LDH，以钼酸钠为钼源，硫脲为硫源，水合肼为还原剂，具有析氧活性。对于析氧反应，最小初始过电位为1.38 V，电流密度为10 mA/cm2时过电位为1.54 V，塔菲尔斜率为62 mV/dec，与合成的2H相MoS2和CoAl-LDH相比与普通水热法相比，有很大的改善。并且与普通水热法合成的CoAl-LDH相比有很大的改进。与普通水热法合成的2H相MoS2和CoAl-LDH相比，有很大的改进。并且与普通水热法合成的CoAl-LDH相比有很大的改进。与普通水热法合成的2H相MoS2和CoAl-LDH相比，有很大的改进。并且与普通水热法合成的CoAl-LDH相比有很大的改进。

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MoS2/CoAl-LDH heterostructure for enhanced efficient of oxygen evolution reaction

Abstract A high proportion of 1 T phase MoS2/CoAl-LDH composite can be synthesized by introducing molybdate into the CoAl-LDH layer and using the confinement effect of hydrotalcite in the hydrothermal vulcanization of molybdate. Compared with the traditional hydrothermal method, the MoS2 obtained has the advantages of large specific surface area and many defects, and the CoAl-LDH plate is fully opened, and the two have obvious synergistic effect in the catalytic process. The material was modified on the surface of glassy carbon electrode and applied to electrocatalytic hydrogen evolution and oxygen evolution in alkaline solution. Linear voltammetry, Tafel curve, AC impedance curve and stability test were carried out. The results show that MoS2/CoAl-LDH prepared by two-step method, based on the interlayer confinement effect of hydrotalcite, with sodium molybdate as Mo source, thiourea as S source and hydrazine hydrate as reducing agent, has oxygen evolution activity. For the oxygen evolution reaction, the minimum initial overpotential is 1.38 V, the overpotential is 1.54 V at the current density of 10 mA/cm2, and the Tafel slope is 62 mV/dec, Compared with the 2H phase MoS2 and CoAl-LDH synthesized by common hydrothermal method, it has a great improvement. And it is greatly improved compared with the CoAl-LDH synthesized by common hydrothermal method.

更新日期：2020-12-01

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