文献类型：期刊文献

英文题名：Highly Efficient Oxygen Evolution Activity of Ca₂IrO₄ in an Acidic Environment due to Its Crystal Configuration

作者：Wu, Yiyi[1];Sun, Wei[1];Zhou, Zhenhua[1];Zaman, Waqas Qamar[1];Tariq, Muhammad[1];Cao, Limei[1];Yang, Ji[1]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Sch Resources & Environm Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2018

卷号：3

期号：3

起止页码：2902

外文期刊名：ACS OMEGA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000427939400048)】；

基金：This research is based on the work supported by the National Natural Science Foundation of China (51778229) and the "Shu Guang" project of the Shanghai Municipal Education Commission. We thank beam line BL14W1 (Shanghai Synchrotron Radiation Facility, Shanghai) for providing the beam time.

语种：英文

摘要：We systematically characterized the perovskite-like oxides Ca2IrO4 and CaIrO3 as the oxygen evolution reaction (OER) catalysts. Compared with IrO2, universally accepted as the current state-of-the-art OER catalyst, Ca2IrO4 showed an excellent OER catalytic activity in an acidic environment, whereas CaIrO3 did not. X-ray photoelectron spectroscopy (XPS) spectra showed that the oxidation of iridium in Ca2IrO4 and CaIrO3 was slightly beyond + 4. X-ray absorption near-edge structure (XANES) spectra illustrated that the IrO6 octahedral geometric structure in Ca2IrO4 and CaIrO3 showed differences. The IrO6 octahedral is asymmetrically distorted and uniformly compressed in Ca2IrO4 and CaIrO3. Therefore, we propose that the IrO6 octahedral distortion plays an important role in the OER activities.