普鲁士蓝类似物衍生 FeSe₂/CoSe₂复合材料的制备及在碱性电解液中的高效电催化析氢性能

Preparation of Prussian Blue Analogue-derived FeSe₂/CoSe₂ Composites and Their Efficient Alkaline Electrocatalytic Hydrogen Evolution Performance

摘要

通过共沉淀法结合硒化策略合成了普鲁士蓝类似物(PBA)衍生过渡金属硒化物(FeSe₂, CoSe₂和FeSe₂/CoSe₂)碳基复合材料, 并系统评估了3种催化剂在碱性电解液中作为析氢反应(HER)阴极材料的催化活性和稳定性. 采用XRD, SEM和XPS对合成的催化剂进行了物相分析和形貌表征. 结果表明, FeSe₂/CoSe₂材料表现出最优异的电催化析氢性能, 在10 mA/cm²电流密度下的过电位仅为118 mV, Tafel斜率仅为86 mV/dec, 催化性能优于单一相的FeSe₂和CoSe₂. FeSe₂/CoSe₂性能增强主要归因于FeSe₂和CoSe₂界面间的强电子耦合作用优化了其电子结构. 此外, FeSe₂/CoSe₂催化剂在经过8 h的稳定性测试后, 过电位保持率仍达到91.74%； 并且3种催化剂经过1000次CV循环后的LSV曲线几乎不变, 表现出良好的电化学稳定性.

Abstract

Using a coprecipitation method combined with a selenization strategy, Prussian blue analogue (PBA) derived transition metal selenides-based (FeSe₂, CoSe₂ and FeSe₂/CoSe₂) composites were synthesized, and the catalytic activity and stability of these three catalysts as cathodes for the hydrogen evolution reaction (HER) in alkaline electrolytes were systematically evaluated. The synthesized catalysts were characterized by XRD, SEM, and XPS to determine their phase composition, morphology, and surface chemistry. The results indicate that the FeSe₂/CoSe₂ composite exhibits the most outstanding electrocatalytic hydrogen evolution performance, with an overpotential of only 118 mV at 10 mA/cm² and a Tafel slope of only 86 mV/dec. FeSe₂/CoSe₂ catalytic performance surpasses that of the single-phase FeSe₂ and CoSe₂, owing to the strong electronic coupling at the FeSe₂/CoSe₂ interface, which optimizes the electronic structure of FeSe₂/CoSe₂. After an 8 h chronopotentiometry test, the FeSe₂/CoSe₂ catalyst exhibited an overpotential retention rate of 91.74%, and the linear sweep voltammetry curves of all three catalysts remained nearly unchanged after 1000 cyclic voltammetry cycles.

关键词

电解水析氢反应 / 过渡金属硒化物 / 电催化 / 电极材料 / 普鲁士蓝类似物

Key words

Hydrogen evolution reaction / Transition metal selenide / Electrocatalysis / Electrode material / Prussian blue analogue

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基金资助

国家自然科学基金(51672208)

陕西省自然科学基金重点项目(2019JZ-20)

陕西省重点研发计划国际合作重点项目(2019KWZ-03)

陕西省重点科技创新团队项目(2022TD-34)