Mn掺杂提高IrO2-Ta2O5 电极在硫酸溶液中析氧的电催化活性

Improving Electrocatalytic Activity of IrO2-Ta2O5 Electrode for Oxygen Evolution in Sulfuric Acid Solution by Mn-doping

摘要:

制备了不同 Mn 含量的IrO₂-Ta₂O₅-MnO_x电极。揭示了Mn含量对该类电极的物理和电化学特性的影响。结果表明，涂??覆的IrO₂-Ta₂O₅-MnO_x层由于其凹凸不平的多孔结构而具有较大的比表面积。少量Mn的加入抑制了活性成分IrO₂的结晶，并将其转化为Ir³⁺。适当地用 Mn 代替Ir可以显著提高 IrO₂-Ta₂O₅-MnO_x 电极的电催化性能。高的电催化活性、长的寿命和低的成本得益于 Mn 掺杂的电极具有更大的活性表面积，从而促进了硫酸溶液中氧的析出。

Abstract:

IrO₂-Ta₂O₅-MnO_x electrodes with different Mn contents were prepared. The effect of Mn content on the physical and electrochemical characteristics of these electrodes was revealed. The results show that the coated IrO₂-Ta₂O₅-MnO_x layer has a larger specific surface area due to its bumpy and porous structure. The doping of a small amount of Mn inhibits the crystallization of the active ingredient IrO₂ and turns it into Ir³⁺. With properly replacing Ir with Mn, the electrocatalytic performance of the IrO₂-Ta₂O₅-MnO_x electrodes can be enhanced dramatically. The increased electrocatalytic activity, longer lifetime and lower cost benefit from the larger active surface area of the Mn-doped electrode, thus promoting the release of oxygen in the sulfuric acid solution.