A Study on the Triangular-Wave Electrodeposition of Iridium Oxide on Ti

Abstract

Iridium oxide is recognized as the best oxygen evolution anode material due to its excellent electrocatalytic activity and long-term stability in acidic environment. Electrodeposition, as a new method for preparing iridium oxide catalysts, has attracted extensive attention in recent years. We report a triangular-wave electrodeposition method for the preparation of iridium oxide electrodes and successfully synthesized highly active IrOx electrodes with ultralow iridium loading. The IrOx electrode prepared at 100 mV s-1 for 100 cycles exhibited a superior mass activity of 3.11 A mgIr-1, while the IrOx electrodeposited at 20 mV s-1 for 500 cycles has the best apparent electrocatalytic activity, with a Tafel slope as low as 54.75 mV dec-1. Physical characterization and electrochemical experiments show that the calcination treatment plays an important role in enhancing the OER performance of the electrodes. Remarkably, the calcined IrOx-TWE/Ti can continuously catalyze OER in 0.5 M H2SO4 at 50 mA cm-2 for 150 h with a slight performance decay, demonstrating a supper large stability number of 2.78 X 105. This work provides some valuable insights into the application of electrodeposition-based iridium oxide to practical industrial systems.

Functionalized orthopaedic implant as pH electrochemical sensing tool for smart diagnosis of hardware infection

“…Furthermore, iridium was selected as an H + sensing material due to its biocompatibility, which has been demonstrated in various studies, 28–31 making it suitable for functionalizing implanted orthopaedic devices. In detail, cytotoxicity assessments conducted on the specific material demonstrate that iridium oxide exhibits minimal cytotoxicity, with cell viability higher than 70%, 28,29 a threshold set by the ISO standard 10993-5:2009.…”