Fe2O3-Co3O4异质结的熔盐法制备及其析氢性能

doi:10.19964/j.issn.1006-4990.2023-0262

摘要/Abstract

摘要：

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。

关键词: 熔盐法, 异质结构, 钴铁氧化物, 电解水析氢

Abstract:

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-Co₃O₄heterostructure.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.

Key words: molten salt method, heterosture, cobalt iron oxide, electrocatalytic hydrogen evolution

中图分类号:

TQ151.1

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.

LI Yuhang, WANG Yinbin, WEI Qiang. Preparation of Fe₂O₃-Co₃O₄ heterojunction by molten salt method and its hydrogen evolution performance[J]. Inorganic Chemicals Industry, 2023, 55(8): 51-58.

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Fe₂O₃-Co₃O₄异质结的熔盐法制备及其析氢性能

Preparation of Fe₂O₃-Co₃O₄ heterojunction by molten salt method and its hydrogen evolution performance

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