超薄MOF纳米片前驱体高效电催化OER反应

Ultrathin metal-organic framework nanosheets as precursors for efficient electrocatalysts for oxygen evolution reaction

摘要:

金属-有机骨架材料作为前驱体制备特定形貌的纳米材料用于水氧化反应(OER)，成为新的研究热点。使用溶剂热法在泡沫镍基底上合成超薄的NiCoFe-MOF纳米片，在保留其纳米片形貌的基础上原位电化学转化为金属氢（羟基）氧化物。在1 M KOH电解液中，10 mA?cm-2电流密度时的过电位仅为189 mV，Tafel斜率为35 mV/dec，且长时间电解实验表明其具有较高稳定性。原位拉曼结果表明，反应的高活性来源于反应过程中的“活性氧物种”中间体。

Abstract:

Metal-organic frameworks (MOFs), as promising precursors for specific morphologies nanomaterials for oxygen evolution reaction (OER), become a new research focus. Ultrathin NiCoFe-MOF nanosheets are synthesized on the Ni foam substrate by solvothermal method and becomes converted into metal hydrogen (hydroxy) oxide on the basis of retaining the morphology of the nanosheets under the In-situ electrochemical conditions. The overpotential of 189 mV at a current density of 10 mA?cm-2 and a Tafel slope of 35 mV/dec in 1 M KOH electrolyte, long-term electrolysis experiment also signifies its excellent stability. In-situ Raman spectroscopic reveals that the high activity of the OER derives from the "active oxygen" species intermediates.