MOFs衍生的CoP@FeP异质结催化剂在碱性海水制氢中的应用

MOFs-Derived CoP@FeP Heterojunction Catalyst for Hydrogen Production under Alkaline and Seawater Conditions

摘要: 氢气作为一种安全，清洁且热值高的能源而备受关注。通过电解水阴极析氢反应(HER)的“绿氢”制备法是代替传统化石燃料的工业制氢的良好途径。本文将金属有机骨架ZIF-67和MIL-88复合成ZIF-67@MIL-88A后磷化，制备具有特殊结构形貌的CoP@FeP异质结材料。通过扫描电子显微镜(SEM)，X射线衍射(XRD)对CoP@FeP异质结复合材料进行物理表征。此外，还通过线性扫描伏安法(LSV)，循环伏安法(CV)，电化学阻抗谱(EIS)，等电化学方法研究了该材料在碱性条件下的HER性能。结果显示，与对比材料相比，CoP@FeP异质结修饰电极在电解水制氢时具有最好的电催化性能。该电极在碱性介质中具有较小的过电位、Tafel斜率、电化学阻抗以及良好的长期稳定性，较高的活性面积等良好的性能。将其应用在模拟海水中同样展现出优异的催化活性、稳定性，为海水氢气制备提供了新的方案。

Abstract: Hydrogen as a safe, clean and high calorific value energy source has attracted much attention. The “green hydrogen” preparation method through electrolytic water cathode is a good way to replace the traditional industrial hydrogen production method of fossil fuels. In this paper, metal-organic skeleton ZIF-67 and MIL-88 were phosphating to prepare the CoP@FeP material with special structural morphology. The CoP@FeP composite was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). In addition, linear sweep voltammetry (LSV), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and other electrochemical methods were used to study the HER properties of the material under alkaline conditions. The results show that the CoP@FeP modified electrode has the best electrocatalytic performance for hydrogen production by water electrolysis with low overpotential, Tafel slope, electrochemical impedance, good long-term stability and high active area in alkaline medium. It also shows excellent catalytic activity and stability in seawater, which provides a new scheme for the preparation of hydrogen from seawater.