Fe2O3-Co3O4异质结的熔盐法制备及其析氢性能
收稿日期: 2023-05-09
网络出版日期: 2023-08-25
基金资助
国家自然科学基金(22078360)
Preparation of Fe2O3-Co3O4 heterojunction by molten salt method and its hydrogen evolution performance
Received date: 2023-05-09
Online published: 2023-08-25
氧化物在电催化析氢反应中具有广阔的应用前景。以NaF和KNO3的混合盐为反应介质，以CoCl3和FeCl3为原料，通过熔盐法于350 ℃煅烧2 h便可制得Fe2O3-Co3O4异质结构，并将其用于绿色制氢。借助X射线衍射、扫描电子显微镜、透射电子显微镜、X射线光电子能谱分析样品的微观形貌、物相结构和电子结构信息，验证了Fe2O3和Co3O4之间存在有效耦合。Fe2O3可使催化剂表面粗糙，大幅增加活性比表面积。此外，Fe2O3和Co3O4之间存在电子相互作用，Fe2O3向Co3O4提供电子，降低Co原子的价态，大大提升了Fe2O3-Co3O4的催化活性。通过电化学工作站探究该催化剂碱性析氢性能得出，在电流密度为10 mA/cm2时其过电位为302 mV、塔菲尔斜率为60.9 mV/dec，均低于Co3O4。同时，Fe2O3-Co3O4在碱性电解液中具有良好的稳定性。
李宇航 , 王银斌 , 魏强 . Fe2O3-Co3O4异质结的熔盐法制备及其析氢性能[J]. 无机盐工业, 2023 , 55(8) : 51 -58 . DOI: 10.19964/j.issn.1006-4990.2023-0262
Oxides have promising applications in electrocatalytic hydrogen evolution reactions.By using NaF and KNO3 as the reaction medium and CoCl3 and FeCl3 as the raw materials，the final product Fe2O3-Co3O4 heterojunctions could be produced using molten salt method by calcining at 350 ℃ for two hours and used for green hydrogen production.The morphology，phase structure and electronic structure information of the obtained samples were characterized by X-ray diffraction（XRD），scanning electron microscope（SEM），transmission electron microscope（TEM），X-ray photoelectron spectroscopy（XPS），verifying the effective coupling between Fe2O3 and Co3O4.The introduction of Fe2O3 roughened the catalyst surface and substantially increased the active specific surface area.Besides，there was an electronic interaction between Fe2O3 and Co3O4.Fe2O3 provided electrons to Co3O4 to reduce the valence state of Co atom，which greatly improved the hydrogen evolution reaction activity of Fe2O3-Co3O4 heterostructure.The hydrogen evolution performance of alkaline electrolyzed water was explored by electrochemical workstation.The overpotential at 10 mA/cm2 was 302 mV and the Tafel slope was 60.9 mV/dec，both of which were lower than that of the Co3O4.Meanwhile，Fe2O3-Co3O4 showed good stability in the alkaline electrolyte.
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