基于二羧酸配体构筑的铁基金属有机骨架材料的制备及其电催化析氧性能

Preparation of Fe-based metal organic frameworks from dicarboxylic acid ligands for electrocatalytic oxygen evolution

以三氯化铁为铁源、不同的二羧酸为配体,制备一系列铁基金属有机骨架材料(MOFs)。利用XRD、SEM和FT-IR等表征手段对其结构、形貌进行表征。结果表明,不同二羧酸配体构筑的铁基MOFs的析氧活性不同。相较于其他配体,以反丁烯二酸为配体构筑的MOFs表现出优异的析氧活性,在1 mol/L KOH电解液中,仅需255 mV和302 mV过电势即可达到10 mA/cm^(2)和100 mA/cm^(2)的电流密度,其对应的Tafel斜率仅为28.3 mV/dec;此外,该MOFs催化剂表现出优异的催化稳定性。

A series of iron-based metal organic frameworks(MOFs) are synthesized by using ferric trichloride as iron source and different dicarboxylic acids as ligands.The samples’ structure and morphology are systematically investigated by means of XRD,SEM and FT-IR.Electrochemical tests indicate that Fe-based MOFs constructed with different dicarboxylic acid ligands have different oxygen evolution performances.Compared with other ligands, the MOFs constructed with fumaric acid as ligand exhibit excellent oxygen evolution activity, which can achieve a current density of 10 mA·cm^(-2)and 100 mA·cm^(-2)with only 255 mV and 302 mV of potentials, respectively in 1 mol·L-1KOH electrolyte.The corresponding Tafel slope is 28.3 mV·dec^(-1).In addition, this MOFs catalyst exhibits excellent catalytic stability.