界面结构CeO_(2)@FeOOH电解水催化剂的设计与制备

Rational Design and Fabrication of CeO_(2)@FeOOH Hetrotructure as Anodic Electrocatalyst for Water Splitting

为开发出一种高效且低能耗的电解水制氢催化剂,引入界面工程调控手段,构筑了包含CeO_(2)和FeOOH界面结构的纳米复合材料CeO_(2)@FeOOH。首先通过一步水热法制备了CeO_(2)纳米结构,随后以其为基底材料,采用水浴法,以FeSO_(4)·7H_(2)O作为铁源,Fe^(2+)水解并被氧化最终于CeO_(2)表面形成FeOOH结构。材料的微观形貌及其物相结构表征证实,所得复合材料为无定型结构的纳米颗粒,且负载的FeOOH表现为无特定晶型结构。电化学测试结果表明,所得材料CeO_(2)@FeOOH具有碱性电解水阳极端催化活性,当驱动电流密度为10 mA/cm^(2)时,其所需过电势为292 mV,相较于其构筑界面前的单体材料CeO_(2)(335 mV)和FeOOH(340 mV)分别提升12.8%和14.1%。结果表明:通过构筑CeO_(2)和FeOOH界面结构,能够有效提升复合材料的碱性电解水催化活性,且所得材料CeO_(2)@FeOOH相较于商用催化剂具有低成本、长周期稳定性以及高催化活性的竞争优势。

In order to develop a high-efficiency and low-energy-consumption catalyst for water to hydrogen electrolysis production,the interface engineering method was introduced to construct a nanocomposite material CeO_(2)@FeOOH which containing the interface structure of CeO_(2)and FeOOH.First,the CeO_(2)nanostructure was prepared by a one-step hydrothermal method,and which then serving as the base material.By using the FeSO_(4)·7H_(2)O as the iron source under the water bath treating,Fe^(2+)ion was hydrolyzed and oxidized to form FeOOH structure on the surface of CeO_(2).The microscopic morphology of the material and the phase structure characterization confirmed that the obtained composite material was the amorphous structure of nano-particles,and the loaded FeOOH exhibits an amorphous crystal structure.The electrochemical test results show that the obtained material CeO_(2)@FeOOH has the good performance of catalytic activity toward the anodic of alkaline electrolyzed water.When it driving the current density of 10 mA/cm^(2),the required overpotential is 292 mV,which better than The results show that by constructing the CeO_(2)and FeOOH interface structure,the catalytic activity of alkaline electrolysis water of the composite material can be effectively improved,and the obtained material CeO_(2)@FeOOH owns the competitive advantages of low cost,long-term stability and high catalytic activity compared with that of commercial catalysts.