Related Experiment Video
Updated: Jan 20, 2026

Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment
Published on: December 3, 2019
Highly Efficient Oxygen Evolution Activity of Ca2IrO4 in an Acidic Environment due to Its Crystal Configuration
Yiyi Wu1, Wei Sun1, Zhenhua Zhou1
1State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Processes, School of Resources and Environmental Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China.
Abstract:
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.
Related Concept Videos
11:38Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment
10:15Proteomic Analysis of Human Macrophage Polarization Under a Low Oxygen Environment
Crystallization of Salicylic Acid via Chemical Modification
Processing of biochemicals involves unit operations such as crystallization, ultracentrifugation, membrane filtration, and preparative chromatography, all of which have in common the need to separate large from small molecules, or solid from liquid. Of these, crystallization is the most important from a tonnage standpoint. For that reason, it is commonly employed in the...
The Evidence for Evolution
06:46Highly Efficient Transfection of Primary Macrophages with In Vitro Transcribed mRNA
06:19High-Throughput Screening to Obtain Crystal Hits for Protein Crystallography
