光化学制备氧化铱纳米粒子过程中添加剂对形貌及其电催化性能的影响

Iridium oxide nanoaggregates have been fabricated by accelerating the hydrolysis of IrCl3 in alkalescent condition with glucose or hydrogen peroxide as the additive, through the introduction of UV irradiation. During the reaction, the UV-Vis extinction spectra of the reaction solutions were acquired at fixed intervals, and the evolution of the spectra was analyzed to interpret the reaction process. The results indicate that glucose can significantly retard the generation of IrOx, while H2O2 has little effect on this process. The difference in reaction process between these two systems results in products with different morphologies. Transmission electron microscopy (TEM) images demonstrate that the nanoaggregates obtained in solutions containing glucose or H2O2 are quasi-spherical or network-liked, respectively, both of which are consisted of small particles with diameter less than 2 nm. Furthermore, electrochemical measurements of these IrOx nanoaggregates were conducted, and the result showed that the quasi-spherical nanoaggregates exhibited higher electrocatalytic activity towards oxygen evolution reaction than the network-liked ones.