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
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MOSⅠ-MW,M=Fe、Co、Ni)和不同硫化程度的FeOSⅠ-MW、FeOSⅡ-MW和FeO-MW共5例样品。电化学性能测试结果表明,FeOSⅠ-MW表现出该系列样品中最佳的OER性能,在50 mA/cm2的电流密度下过电势仅为294 mV,Tafel斜率为41.7 mV/dec,Rct为1.146 Ω,且在50 mA/cm2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FeOSⅠ-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 MOSⅠ-MW (M=Fe,Co and Ni) with different metal active centers and FeOSⅠ-MW (FeOSⅡ-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 FeOSⅠ-MW sample is 294 mV only,its Tafel slope is 41.7 mV·dec-1,and its Rct is 1.146 Ω.All the performance indexes of FeOSⅠ-MW sample are better than other samples,and FeOSⅠ-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 FeOSⅠ-MW electrode.
过渡金属硫化物 / 快速制备 / 析氧反应 / 非贵金属催化剂
transition metal sulfide / rapid preparation / oxygen evolution reaction / non-precious metal catalyst
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