微波硫化法制备铁基硫-氧复合化合物及其电化学析氧性能研究  

Preparation of iron-based sulfur-oxygen composite compounds by microwave vulcanizing method and study on their electrochemical oxygen evolution performance

作　　者：杨宏麟 储伟[1] 张君君 YANG Hong-lin;CHU Wei;ZHANG Jun-jun(School of Chemical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《现代化工》2025年第4期201-207,共7页Modern Chemical Industry

摘　　要：针对一元铁基氧化物本征OER活性差及铁基硫化物制备方法效率不高的问题,通过微波加热硫化法制备了具有不同金属活性中心的过渡金属硫-氧复合化合物(记为MOS_(Ⅰ)-MW,M=Fe、Co、Ni)和不同硫化程度的FeOS_(Ⅰ)-MW、FeOS_(Ⅱ)-MW和FeO-MW共5例样品。电化学性能测试结果表明,FeOS_(Ⅰ)-MW表现出该系列样品中最佳的OER性能,在50 mA/cm^(2)的电流密度下过电势仅为294 mV,Tafel斜率为41.7 mV/dec,R_(ct)为1.146Ω,且在50 mA/cm^(2)的电流密度下能稳定工作长达12 h。经过XRD、XPS、SEM、TEM等表征分析得出,随着硫化程度增强,材料结晶度更趋于非晶态、纳米结构更丰富、Fe-S间电子调制作用更强烈,从而导致FeOS_(Ⅰ)-MW电极的OER性能增强。In the light of the issues that iron-based oxides have a poor intrinsic OER activity and the preparation methods for iron-based sulfides delivers a low efficiency,five samples,including MOS_(Ⅰ)-MW(M=Fe,Co and Ni)with different metal active centers and FeOS_(Ⅰ)-MW(FeOS_(Ⅱ)-MW and FeO-MW)with different degrees of vulcanization,are prepared via microwave-heating vulcanization method.Electrochemical performance tests show that FeOSⅠ-MW exhibits the best OER performance among the samples.Under a current density of 50 mA.cm-2,the overpotential of FeOS_(Ⅰ)-MW sample is 294 mV only,its Tafel slope is 41.7 mV.dec^(-1),and its Rct is 1.146Ω.All the performance indexes of FeOS_(Ⅰ)-MW sample are better than other samples,and FeOS_(Ⅰ)-MW can work stably for up to 12 h at a current density of 50 mA·cm^(-2).Characterization via XRD,XPS,SEM and TEM reveals that as the vulcanization degree enhances,the crystallinity of the material tends towards an amorphous state,the nanostructure becomes more abundant,and the electron modulation effect between Fe and S becomes stronger,ultimately leading to an enhancement in the OER performance of as-prepared FeOS_(Ⅰ)-MW electrode.

关 键 词：过渡金属硫化物 非贵金属催化剂 析氧反应 快速制备 

分 类 号：TQ116.2[化学工程—无机化工] TQ426