无定形Fe基MOF材料的制备及析氧性能研究

Preparation and Oxygen Evolution Performance of Amorphous Fe Based Metal Organic Frameworks

采用外来金属离子诱导策略,通过一步溶剂热法成功制备了一系列In x Fe y-aMOF材料,并探究其在析氧反应中的应用.XRD、TEM和N 2吸附结果表明:Fe 3+的引入使原始晶态In-MOF失去长程有序结构,无序的纳米结构拥有较高的比表面积和丰富裸露的金属活性位点,有利于电催化反应进行.Fe-aMOF表现出最佳的析氧反应活性:在电流密度为0.01 A/cm^(2)时,过电位仅为258.2 mV,塔菲尔斜率为45.4 mV/dec.此外,Fe-aMOF还具有长期稳定性,在0.01 A/cm^(2)时至少可以连续运行110 h.该研究为合理设计和构建新一代高效电催化剂提供了一种独特的思路.

A series of In x Fe y-a MOF materials were successfully prepared by one-step hydrothermal method using foreign metal ion induction strategy,and their potential as oxygen evolution reaction(OER)electrocatalysts was demonstrated.XRD,TEM and N 2 adsorption results manifest that the introduction of Fe 3+makes the original In-MOF lose long-range ordering.Such disordered nanostructures have high specific surface area and abundant exposed metal active sites,which is in favor of the electrocatalytic performance.Specially,Fe-aMOF exhibits superior OER activity,only requiring an overpotential of 258.2 mV to deliver the current density of 0.01 A/cm^(2),along with a low Tafel slope of 45.4 mV/dec.Moreover,Fe-aMOF also has outstanding durability and can run continuously for at least 110 h at 0.01 A/cm^(2).This work will further bring unique insights for the rational design and construction of next-generation high-efficience electrocatalysts.